Impact of Magnetic Water Irrigation for Improve the Growth, Chemical Composition and Yield Production of Broad Bean (Vicia faba L.) Plant

Magnetic water is considered one of several physical factors affects plant growth and development. Magnetic water fields are known to induce biochemical changes and could be used as a stimulator for growth related reactions. The seeds of broad bean (Vicia faba, L. cv. Giza 3) were irrigated with water passed through magnetic device (Magnetic Funnel MAGNETIC TECHNOLOGIES DUBAI, UAE, LLC. FATENT No. 1826921). Two pot experiments were conducted during season 2010-2011 at greenhouse to study the impact of magnetized water on growth, some chemical constituents and yield productivity of broad bean plants. Magnetic water increased leaf area than that the tap water (control). The stimulatory impact of magnetic water may be ascribed to the increasing of plant growth (plant height, leaf area, leaves, stems, roots fresh and dry weights) and yield production, which increase absorption and assimilation of nutrients. It appears that irrigation with magnetic water may be considered a promising technique to improving the growth and water content of broad bean plant. Magnetic water treatment could be used to enhance growth, chemical constituents (chlorophyll a and b, carotenoids, total available carbohydrates, protein, total amino acids, proline contents, total indole, total phenol, GA3, kinetin, RNA, DNA,) and inorganic minerals (K, Na, Ca and P) contents in all parts of broad bean plant under greenhouse condition. Results indicated that, irrigation with magnetic water induced positive significant effect on all studied parameters.. [Hameda El Sayed Ahmed El Sayed. Impact of Magnetic Water Irrigation for Improve the Growth, Chemical Composition and Yield Production of Broad Bean (Vicia faba L.) Plant. Nat Sci 2015;13(1):107-119]. (ISSN: 1545-0740). http://www.sciencepub.net/nature. 16


Introduction
Broad bean (Vicia faba, L.) is an important tropical and subtropical grain legume providing protein, vitamins and minerals. Water is the most important factor for plant growth. The attempts to increase food and energy production for satisfying growing needs led to intensive development of plant production through the use of chemical additives, which in its turn caused more and more pollution of soil, water and air (Aladjadjiyan, 2012). Irrigation with magnetized water increase seed germination (Ijaz et al., 2012). The water treated by the magnetic field or pass through a magnetic device called magnetized water, when water is magnetized, some physical and chemical properties changed that may be causing changes in plant characteristics, growth and production. Grewal and Maheshwari (2011) showed magnetic treatment of seeds and irrigation had a potential to improve the early seedling growth and nutrient contents of seedlings. Utilization of magnetized water improved quantity and quality of common bean crop. It was detected that the magnetic field stimulated the shoot development and led to the increase of the germinating energy and fresh weight, and shoot length of maize (Aladjadjiyan, 2002). Some beneficial effects of the magnetic treatment of irrigation water for the plant yield and water productivity possibly suggested by Maheshwari and Grewal (2009). The understanding of the stimulating effect requires availability of rich experimental material (Aladjadjiyan, 2010). Recently the use of physical methods for plant growth stimulation is getting more popular due to the less harmful influence on the environment. Moreover, magnetized water for irrigation is recommended to save irrigation water (Mostafazadeh-Fard et al., 2011). Irrigation of common bean plants with magnetic water increased significantly the growth characteristics, potassium, GA3, kinetin, nucleic acids (RNA and DNA), photosynthetic pigments (chlorophyll a & b and carotenoid), photosynthetic activity and translocation efficiency of photoassimilates as compared with control plants (Moussa, 2011).
However, the available studies and application of this technology in agriculture is very limited. Therefore, the aim of the present work to study the effect of irrigation with magnetized water on growth, yield, yield components and some chemical constitute of broad bean (Vicia faba, L. cv. Giza 3) under greenhouse condition.

Material and Methods
In order to evaluation the effects of magnetic water on broad bean (Vicia faba, L.) plant, two pots group experiments were conducted in the screen green house during winter season (2010/2011) to study the response of growth, yield, organic and inorganic components of broad bean plant after irrigated with normal tap water and magnetic water. A homogenous lot of clean-healthy common broad bean seeds (Vicia faba L. cv. Giza 3) was obtained from the Crop Institute, Agricultural Research Center, Giza, Egypt. The Seeds of broad bean (Vicia faba, L. cv. Giza 3) were surface sterilized in 0.1 % (w/v) sodium hypochloride solution and then thoroughly rinsed with sterile deionized water. Two pots group experiments were conducted to study the response of growth parameters, yield and some biochemical constituents of broad bean plant for irrigation with magnetic and tap water. Selected the seeds and planted in pots (40 cm in diameter and 60 cm depth) containing a mixture of clay and sandy soil (½ ≈ v/v). Seedlings were irrigated two weeks after sowing into plastic growth bags with the same soil as indicated above in a glasshouse (at 10 o C/17 o C), with supplementary lighting (red electric bulb, 20 w at night), at relative humidity of 75-80%. One group from the pots were irrigated twice a week interval with normal tap water needed with full strength Hoagland nutrient solution (Hoagland and Arnon, 1950), while the other pots were irrigated with the tap water after magnetization through passing in magnetic device (Magnetic Funnel -MAGNETIC TECHNOLOGIES DUBAI, UAE, LLC. FATENT No. 1826921) also, needed with full strength Hoagland nutrient solution, and allowed to grow for about 110 -120 days post sowing.

Growth Parameters:
The experiments conducted five times in complete randomization replicated design. At 75 days from sowing (flowering stage), growth characteristics and the biochemical analysis of broad bean plants were determined. Plant growth parameters such as plant height, fresh and oven dried weight (80-85°C for 48 h) of leaves, stem and roots were determined. Also, leaf area was calculated using (Leaf Area Meter -Laser Leaf Area Meters CI-202), CID, Bio-Science, USA.

Water Relations: Succulence and Dry matter content (%):
The percentage of the Succulence content and dry matter content (DMC%) was determined after drying the shoot and root samples in air -circulation oven at 80 o C after constant weight, and calculated as the following equation The relative water content (RWC%) was measured according to a modification of the method of Weatherly (1950); Slatyer (1957); Weatherly and Barr (1962). Detached leaf samples were weight immediately and floated on distilled water in a darkened refrigerator (5˚C). Saturation of the leaves was attained after 24 h. and the leaves were rapidly and thorough blotted and weighed immediately. The leaves were then dried at 80˚C to constant weight in an air -circulation oven to constant weight. The relative water content of leaves was expressed according to the following equation: R W C % (S. Wt. %) = (F. wt. -Oven D. Wt)x 100 (3) (Saturated Wt.-Oven D. Wt).

Magnetic Water and Yield Production:
At harvest, the effects of magnetic water and normal tap water on branches number/plant, pods number/plant, pods weight (g)/plant, seeds number/plant, total seeds (yield/plant), seeds yield weight (g)/plant and straw yield (g)/plant were recorded.

Physiological Studies Photosynthetic Pigments:
Chlorophyll a, chlorophyll b and carotenoids) of leaves were determined spectrophotometrically as the method described by Metzner et al. (1965 The pigment fractions were calculated as µg Chl./mg D.W. Photosynthetic Activity: Chloroplasts were prepared by the method of Aronoff (1949) and Osman, et al. (1982). Fresh leaves were shredded, ground for one min in a blender, using a buffered solution of 0.4 M sucrose, 20 mM HEPES-KOH (pH 7.8), 3 mM MgCl 2 , 4 mM sodium ascorbate and 0.1% bovine serum albumin (BSA).
The much was strained through cheese-cloth, filtered and the suspension centrifuged (1 min at 8,000 X g). The pellet was re-suspended in the isolation medium, centrifuged (5 min at 300 X g) and the supernatant recentrifuged (10 min at 1,000 X g). The sediment was re-suspended in a 2 ml buffer solution at pH 6.8 and the aggregates dispersed (Osman et al., 1982). The levels of chlorophyll a & chlorophyll b were determined by the method described by Mackinney (1941). An aliquot of 0.2 ml of the chloroplast suspension was extracted with 3.8 ml of 85% cold aqueous acetone and the density of the extract measured at 652 nm. The chlorophyll content was calculated according to the following equation : C = E652 X 1,000/34.5 mg chl./L (7) Where c = chlorophyll a & b. The photosynthetic activity of the isolated chloroplasts was measured using potassium ferricyanide (5 X 10 -4 M) as an electron acceptor. Reduction of ferricyanide was monitored spectrophotometrically (LKP NOVASPEC) at 420 nm at room temperature. The reduction mixture contained 0.2 ml of chloroplast suspension, (0.2-0.8 mg chl. ml -1 ), 3.8ml HEPES buffer (pH 7.8), and 5 X 10 -4 M potassium ferricyanide. The mixture was illuminated at 300 Wm-2 using a slide projector provided with a heat filter with a 24 v, 250 w quartz halide bulb, 15-45 cm from the well. The photosynthetic activity of the isolated chloroplasts was calculated from the standard curve and expressed as µmol fericyanide mg chl -1 h -1 (Arnon and Shavit, 1963). Organic Components: Carbohydrate: 300 mg of oven dry plant material was extracted with 5 ml of borate buffer (28.63 g boric acid + 29.8 g KCl + 3.5 g NaOH in a liter of hot distilled water), left for 24 hr, then centrifuged and filtered. The filtrate was used for the determination of the direct reducing value (DRV-including all free monosaccharide) and total reducing value (TRVincluding sucrose), while the residue was dried at 80 o C for determination of polysaccharides (Naguib, 1963(Naguib, & 1964. Direct Reducing Value (DRV), was carried out by evaporation, 0.1 ml of extracted cleared borate buffer was reduced to dryness and then mixed with 1 ml of modified Nelson solution (Naguib, 1964).The mixture was maintaining on a boiling water-bath for 15 min, after which it was cooled rapidly using running tap water. Thereafter 1 ml of arsenomolybdate (Nelson, 1944) was added, the mixture was diluted to a definite volume, and its intensity measured at 700 nm, using colorimeter (LKP NOVASPEC Surplus Model 4049 Spectrophotometer). Total Reducing Value (TRV): For determination of total reducing value (TRV), 0.2 ml of cleared extract was mixed with deionized water up to 5 ml then 0.2 ml of the diluted extract was mixed with 0.1 ml of 1% invertase enzyme solution and the mixture maintained at 37 o C for 0.5 hr. Thereafter, the reducing value was determined as described before for DRV (Naguib, 1963(Naguib, & 1964. The difference between the value obtained from this step and that of the DRV is an estimated of sucrose, in terms of glucose made up to 3 ml left overnight at 28 o C and then centrifuged. Polysaccharides: 10 mg of the remaining residue was mixed with 0.2 ml of 1% taka diastase enzyme and 0.1 ml acetate enzyme and ml acetate buffer (6 ml acetic acid 0.2N+4 ml sodium acetate buffer 0.2 N). The reducing value of 1ml of filter was estimated as above (Naguib, 1963).

Nitrogenous Components: Proteins contents:
Dry samples collected during the growth study were analyzed for protein content, after precipitating the protein with 15% TCA at 4 o C according to Lowry et al. (1951).

Total Free Amino Acids contents:
These were determined by the method described by Ya and Tunekazu (1966). An aliquot of 0.1 ml plant extract was heated in a test tube with 1.9 ml of ninhydrin citrate buffer-glycerol mixture in a boiling water bath for 12 min, and cooled at room temperature. Then the tube was well shaken and the optical density read at 570 nm. A blank was determined with 0.1 ml of distilled water and standard curve obtained with 0.005 to 0.2 mM g Glycine.

Proline contents:
This was estimated using the acid ninhydrin method described by Bates et al. (1973). Two ml of water extract were mixed 10 ml of 3% aqueous sulfosalicylic acid. Two ml of this mixture was allowed to react with 2 ml acid ninhydrin-reagent and 2 ml of glacial acetic acid in a test tube for 1 h at 100 o C; the reaction was terminated by cooling the mixture in an ice bath. The reaction mixture was extracted with 4 ml toluene, and mixed vigorously for 15-20s. The chromatophore -containing toluene was aspirated from the aqueous phase, warmed to room temperature, and the absorbance read at 520 nm using toluene as a blank. The proline concentration was determined from a standard curve. Total indole acetic acid (IAA) as described by Larsen et al. (1962), and total phenol, as described by Malik and Singh (1980), were estimated in the fresh shoots. Growth regulators (GA3 and kinetin) were estimated by HPLC following the procedure of Shindy and Orrin (1975). To determine H 2 O 2 concentration, the root extract was mixed with 0.1% titanium chloride in 20% (v/v) H 2 SO 4 . The mixture was then centrifuged at 6 000 g for 15 min. The absorbance was measured at 410 nm (Hsu and Kao, 2007). Lipid peroxidation was measured in terms of malondialdehyde (MDA) content using the thiobarbituric acid reaction as described by Madhava Rao and Sresty (2000). The extraction of nucleic acids (DNA and RNA) carried out by the method cited by Mohamed and Capesius (1980).

Inorganic Mineral Elements:
Ions content measurements were carried out after extraction with 0.1 nitric acid of the ashed (powdered) milled samples at 500 o C obtained after combustion in a muffle furnace, the milled samples were estimated following the "wet ashing procedure" (Richards, 1954); the acid digests of the oven dried samples were analysed. Oven dried plants were subjected to acid digestion and sodium (Na + ) and calcium (Ca 2+ ) estimated photo-metrically using a corning-400 flame photometer (Johnson and Ulrich, 1959;Allen et al., 1974). Phosphor was estimated using the method of Sekine et al. (1972) by the Molybdenum-blue method (Allen et al., 1974). Determination of potassium (K + ) content by Miller (1998) methods, the plant parts were dried in a ventilated oven for approximately 78 h at 60°C to a constant weight and then ground, the samples were digested in a nitric-perchloric acid mixture and analyzed with Atomic Absorption Spectrometer (Carl Zeiss Jena, Germany).

Statistical Analysis:
All data were subjected to F test ANOVA and the means were compared using Duncan's multiple range (P<0.05).Where relevant, the experimental data was subjected to analysis of variance. Percentage values were transformed into arcsines according to Bliss (1973) and analysis of variance was carried out according to Snedecor and Cochran (1967).

Results and discussion Magnetic Water and Growth Parameters:
Data presented in Table (1) showed that the irrigation of broad bean plant with magnetic water increased significantly the growth parameters as compared to pots which irrigated with tap water. The improvement over control treatment reached to 27.39; 60.27; and 65.42 for plant height, fresh and dry weight (g/plant) respectively. Irrigated broad bean plant with magnetic water increased significantly the growth parameters (plant height, fresh and dry weight of leaves, stem, and root, leaf area) as compared to the tap water (control). Fast growing of world population affected negatively the environmental conditions of our life. Increasing number of earth population resulted in growing consumption of food and energy. Both tendencies seriously exhaust the natural resources. These results are correspondence with the result of Morejon et al. (2007). Aladjadjıyan (2002) showed that exposure of seeds of Zea mays has a favorable effect on the development of shoots in the early stages. These results are in agreement with those obtained by other researchers; Hilal and Hilal (2000) they reported that magnetized water has more tripled seedling emergence of wheat than tap water. Renia et al. (2001) found significance increase in the rate of water absorption accompanied with an increase in total mass of lettuce with the increase of magnetic force. Moreover, Nasher (2008) found that chick pea plants irrigated with magnetized water were taller than plants irrigated with tap water Significant increases in pigment fractions were recorded in chickpea plants irrigated with magnetized water compared to control treatment. Magnetic water increased significantly fresh and dry weight of leaf, stem, and root of broad bean as compared to tap water, these results are in line with those of De Souza et al. (2006) and Moussa (2011) who observed that pretreatment of seeds with magnetic field or irrigation with magnetic water increased leaf, stem and root fresh and dry weight of tomato and common bean respectively. Similar enhancing effect of magnetized irrigation water were reported on snow pea and chick pea (Grewal and Maheshwari, 2011), flax and lentil (Abdul Qados and Hozayn, 2010 a& b) and wheat (Hozayn and Abdul Qados, 2010 b). This improved growth may lead to an early canopy cover and a better competition against weeds, and thus more efficient use of nutrients and irrigation water. Positive effects of magnetized water on growth of root, stem and leaf of cowpea are very important since they appear to induce an improved capacity for nutrients and water uptake, providing greater physical support to the developing shoot ( (Pietruszewski, 1993); some review papers also mention a number of controversial, early results (Findlay and Hope, 1976; Frey, 1993).

Magnetic Water and Water Relations:
Data presented in Table (2), indicated that the succulence significantly decreased in all parts (leaf, stem, root) of broad bean plant irrigated by magnetic water more than tap water. Whereas, dry matter content % (DMC%) and relative water content (RWC %) in all broad bean plant parts (leaf, stem, root) increased significantly with irrigated by magnetic water than tap water. Improved water use efficiency with magnetic water could help in the water resources conservation, particularly in arid and semi arid regions. Magnetic water has been reported to change some of the physical and chemical properties of water, mainly hydrogen bonding, polarity, surface tension, conductivity, pH and solubility of salts, these changes in water properties may be capable of affecting the growth of plants (Amiri and Dadkhah, 2006;Otsuka and Ozeki, 2006). Sadeghipour and Aghaei (2013) found that the water use efficiency (in term of total biomass produced to amount of water consumed), was increased in the plants irrigated with magnetic water as compared to the ordinary water, similarly to the result of Al-Khazan et al. (2011) found that irrigation with magnetic water increased water use efficiency in jojoba and also Maheshwari and Grewal (2009) observed that water productivity in celery and snow pea was increased in magnetic water treatment than that control. Meanwhile, treatment with magnetic water had no effect on the water content as compared with the control (Hozayn and Abdul Qados, 2010a).

Magnetic Water and Yield Production:
Data presented in Table (3) show that the irrigation broad bean plants with magnetic water increased significantly the yield production. At harvest stage, the effect of magnetic water and normal tap water on number of branches/plant, number of legumes/plant, were increased significantly compared to control treatment (tap water). These results are the logical to improvement growth parameters, growth hormone, photosynthesis, and translocation efficiency, these results are in agreement with that of De Souza et al. (2006); Hozayn and Abdul Qados (2010a). The results explain the exposure of plants to magnetic water is highly effective in enhancing growth characteristics. This observation suggests that there may be resonance-like phenomena which increase the internal energy of the seed that occurs. Therefore, it may be possible to get higher yield of chickpea (Vashisth and Nagarajan, 2008).

Magnetic Water and Photosynthetic Pigments, Chloroplast activity:
Results presented in Table (4) indicated that the irrigation of broad bean plant with magnetic water exhibited marked significant increase in the chloroplast pigments (chlorophyll a, chlorophyll b, and carotenoids), photosynthetic activity, over the irrigated by tap water (control). Significant increases in the above mentioned characters were recorded from irrigated plants with magnetic water as compared to irrigated plants with tap water. These results agreement with that of Atak et al. chlorophyll content and carotenoids content specifically appeared after treatment with magnetic water. Sadeghipour and Aghaei (2013) found that irrigation with magnetized water increased leaf area and specific leaf area in cowpea than that control, the enhancement in leaf area and specific leaf area in the plants irrigated with magnetic water must have increased photosynthetic rates due to the greater interception of light and the greater amount of assimilates available for vegetative growth. Similar results were found by De souza et al. (2006); Hoff (1981) and Davies (1996) also revealed an increase in photosynthetic rate and influx of water as a result of magnetic treatments.

Organic Components: Total Available Carbohydrates:
In these investigation, irrigated broad bean plant with magnetic water increased significantly total available carbohydrates (Monosaccharide, Disaccharides, polysaccharides) contents compared to irrigated with tap water as shown in Table (5). The increasing significantly in carbohydrates because of the close relationship between stomatal conductance and photosynthesis, thus lead to an increase in photosynthesis. The effects of magnetic exposure on plant growth still require proper explanation. They may be the result of bioenergetics structural excitement causing cell pumping and enzymatic stimulation (De Souza et al., 2006). The present study showed that magnetic water had the greatest effect on root weight. It suggests that enhancement the growth of stem and leaves was related to increasing of root growth which improved water and ions absorption. Ions in the cell have the ability to absorb magnetic energy corresponding to specific parameters related to their vibration and rotation energy sublevels. This phenomenon represents a kind of resonance absorption and could explain the stronger effect of applying definite values of magnetic field induction (Aladjadjiyan, 2010).

Protein, Total Amino Acids, Proline Contents:
Results presented in Table (6) indicated that the magnetic water irrigation exhibited marked significant increase in total protein, total amino acids, proline contents at all plant parts (leaves, stems, roots) of broad bean compared with control plants. Moreover, the protein, amino acids, proline contents increasing in broad bean plants irrigated with magnetic water more than irrigated with tap water may be responsible for the stimulation of growth.
This results are in line with Hozayn and Abdul Qados (2010a). In this respect, Celik et al. (2008) found that the increase in the percentage of plant regeneration is due to the effect of magnetic field on cell division and protein synthesis in paulownia node cultures. Shabrangi and Majd (2009) concluded that, biomass increasing needs metabolic changes particularly increasing protein biosynthesis. It was found out that chloroplasts have paramagnetic properties (Campbell, 1977). The increasing of protein contents in plants irrigated with magnetic water was accompanied with increasing growth promoters (IAA). In this respect, Kuba and Kakimoto (2000) found that IAA effect on DNA replication. Moreover, Celik et al. (2008) and Shabrangi and Majd (2009) reported that magnetic field is known as an environmental factor which affects on gene expression. Therefore, by augmentation of biological reactions like protein synthesis of broad bean yield and its components were increased significantly under magnetic irrigation. These results are logical to improvement growth parameters and growth promoters (IAA) and photosynthetic pigments. The remarkable improvement induced by the magnetic treatment was consistent with the results of other studies on other crops like cereal, sunflower, flax, pea, wheat, pepper, tomato, soybean, potato and sugar beet, in these studies the crop yield were increased (Pittman,1972;Gubbels,1982 . It could be concluded from this study that, broad bean irrigation with magnetic water could effectively increase growth parameters, yield and some chemical constituents.
Magnetic water is considered one of several physical factors affects plant growth and its development. Results obtained showed that broad bean plants which irrigated with magnetic water grew taller and heavier than those irrigated with tap water.
The stimulatory effect of the application of magnetic water on the growth parameters reported in this study may be attributed to the increase in photosynthetic pigments, endogenous promoters (IAA); increase protein biosynthesis. Abdul Qados and Hozayn (2010a) findings the stimulatory impact of magnetic water may be also ascribed to the increasing of stomatal conductance and root growth which increase absorption and assimilation of nutrients. In this connection, Formicheva et al. (1992a & b) and Belyavskaya (2001) reported that magnetic water significantly induces cell metabolism and mitosis meristematic cells of pea, lentil and flax. Moreover, the formation of new protein bands in plants treated with magnetic water may be responsible for the stimulation of all growth, and promoters in treated plants. In this respect, Celik et al. (2008) found that the increase in the percentage of plant regeneration is due to the effect of magnetic field on cell division and protein synthesis in paulownia node cultures. Shabrangi and Majd (2009) concluded that, biomass increasing needs metabolic changes particularly increasing protein biosynthesis. The stimulatory effect of magnetized water on growth parameters may be attributed to the induction of cell metabolism and mitosis (Abdul Qados and Hozayn, 2010b). Also, these results agreement with those obtained by Renia et al. (2001) who found significance increase in rate of water absorption accompanied with an increase in total mass of lettuce with increase of magnetic force. Total Phenols, Total Indole: Also, from these results recoded in Table (7), the total phenols promotive significantly in broad bean plant irrigated by magnetic water compared to tap water plant (control). Whereas, the total indole the magnetic water irrigation no significant effects in broad bean plant compared with tap water (control). This improvement may be attributed to the role of magnetic water in changing the characteristic of cell membrane, effecting the cell reproduction and causing some changes in cell metabolism (Goodman et al., 1995;Atak et al., 2003;Moussa, 2011).

GA 3 , kinetin contents:
Data presented in Table (7) showed that the irrigation of broad bean plant by magnetic water increased significantly the GA 3 and kinetin contents compared to the tap water (control) plant. That means that, in the magnetic field, the magnetic moments of the atoms in them are oriented downwards the field direction, the influence of the magnetic field on plants, sensible to it, increases its energy. Later, this energy is distributed among the atoms and causes the accelerated metabolism and, consequently, to better germination. Turker et al. (2007) showed that an increase in GA3 in sunflower plants treated with magnetic water. Also, Hozayn and Abdul Qados (2010b) stated that, the treatment of wheat with magnetic water increase the cytokinine content which is effective on some events causing mitosis. These results may be due to the effect of magnetic field on alteration the key of cellular processes such as gene transcription which play an important role in altering cellular processes. In this respect Tian et al. (1991) and Atak et al. (2000 and who found an increase in chlorophyll content specifically appeared after exposure to a magnetic field for a short time. Moreover, Atak et al. (2003) suggested that, increase all photosynthetic pigment through the increase in cytokinin synthesis which induced by MF. They also added cytokinin play an important role on chloroplast development, shoot formation, axillary bud growth, and induction of number of genes involved in chloroplast development nutrient metabolism. It also may be due to the increase in growth promoters (IAA) ( Table 2). Similar results were observed on rice and chick-pea when irrigated with magnetic water (Tian et al., 1991 andNasher, 2008). As well as the improvement of photosynthetic pigments were recorded in Paulowria species (Atak et al., 2000), sunflower (Oldocay and Erdem, 2002), soy bean (Atak et al., 2003) when seeds or explants exposed to magnetic field (3.8 -4.8 mt) for a short time.

Nucleic acid (DNA and RNA):
The results presented in Table (7) indicated that the stimulatory effect of magnetic water significantly in the nucleic acid (DNA and RNA) contents in broad bean compared with the using tap water (control), similar results also have been reported by Ozge et al.    Note: F values * = P ＜ 0.05, ** = P ＜ 0.01, *** = P ＜ 0.001 and N.S. = Not Significant. Data presented are the means of five replicate.

Inorganic Mineral Elements:
However, data presented in Table (9) indicated that the irrigation of broad bean plant by magnetic water exhibited an increase in potassium, calcium, phosphorous contents in all parts (roots, stems, leaves and seeds) of broad bean plant compared with the control (tap water) plant, whereas, sodium content tended to decreased significantly in all plant parts (roots, stems, leaves and seeds) irrigated with magnetic water than tap water (control) plants. These results agreement with that of Harsharn et al. (2011); they observed an increase in potassium content in pea after irrigation with magnetic water. Also, Moussa (2001) demonstrated that, there is a direct effect of potassium upon translocation efficiency, because potassium ion (K + ) is known to be one of the three largest constituents in sieve tube sap. Potassium may play a role on the synthesis of endogenous plant hormones (Haeder et al., 1981).

Conclusion
Results of the current study showed the positive impacts of magnetic water on root, stem and leaves growth of broad bean as well as water relations than that the control. The stimulatory effect of magnetic water on the growth in these research may be due to the increase in root growth and stomatal conductance. So as a simple and safe method, irrigation with magnetic water can be used to improvement plant growth and water used efficiency. It appears that utilization of magnetic water can led to improve quantity and quality of broad bean (Vicia faba, L.) crop. It suggests that magnetic water could stimulate defense system, photosynthetic activity, and translocation efficiency of photo-assimilates in broad bean plants. Generally, using magnetic water treatment could be a promising technique for agricultural improvements but extensive research is required on different crops.