doiSerbia

Morphological characteristics of the interspecies hybrid between Sorghum and Sudan grass under intensive nitrogen nutrition

Ikanović Jela (Poljoprivredni fakultet, Beograd)
Popović Vera (Institut za ratarstvo i povrtarstvo, Novi Sad)
Trkulja Vojislav (Univerzitet u Banja Luci, Poljoprivredni fakultet, Banja Luka, Bosna i Hercegovina)
Živanović Ljubiša (Poljoprivredni fakultet, Beograd)
Lakić Željko (Univerzitet u Banja Luci, Poljoprivredni fakultet, Banja Luka, Bosna i Hercegovina)
Pavlović Slobodanka (NUBL Fakultet za Ekologiju, Banja Luka, Bosna i Hercegovina)

The object of this study was a two-year trial (2009 and 2010) regarding variability of morphological characteristics of species belonging to Sorghum genus, more specifically interspecies hybrid between sorghum and Sudan grass Siloking as affected by different applications of nitrogen. The following morphological characteristics were analysed: plant height, number of leaves, leaf ratio, stem ratio, and number of shoots. Samples were taken from the first cut when the effect of the applied nitrogen doses was the strongest. The results showed that increasing nitrogen quantities significantly affected the tested morphological characteristics, especially the intensity of tillering (increased number of secondary stems), number of the formed leaves, and ratio of leaf weight in the total above-ground biomass. The effect of applied nitrogen depended on the weather conditions, i.e. distribution of precipitation, so that plants reached maximum height when 105 kg N ha-1 was applied in the dry year and 180 kg N ha-1 in the wet year.

Keywords: sorghum, interspecies hybrid, genotype, nitrogen nutrition

Projekat Ministarstva nauke Republike Srbije, br. TR 31078 i br. TR 31022