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Fertilization in the nursery has long been 8'1 accepted pr~ctice for improving the vig ' ;r of ' ,rie seedlinKs (Han..'len, 1923;Wilde et al, 1910;Vlami8;t al., 195il.avoid pnssibilities .ofoxygen deficiency in the ro:)t zone, s'Jbsurface irrigation appears more , promising thln sudace flooding or sprinkling, Presumably there is an optimum combination of nutl ie!1ts, p os!;ibly a different optimum for ea ' h species, In soil, however, the ~rch for a n optimum is complicated by the fluctuation 0; nutrient levels with time and by th e vari!:d int, uction of soils with applied fertilizers.
One apparent means of .minimizing these compli!:3tions is growing seedlings in an essentially st:=l ile medium aJl(1 lCupplying nutrients in a fr ~que:1tly-replenit4hed water solu .:ion.To cl iminate possible toxic effects of fertilizer solution on the foliage and simultaneously or than water cul ~.ure. .' A study was undertaken (a) to t~t the feasibility of subsurfaCe lrri,atiori with nl,ltrient solutions, (b) todeterilline ihe' relative ;~~' .

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, ) fertilizers, and (c) to determine " whether :< .effects varied withsPeci~s.'.. Roem.from Mexico were transplanted to perforated 5' x 9 1 /:,!-inch polyethylene bags filler!with firmly packed vermiculite: Film cotyledons still remammg on the Afrormosia seedlings were clipped of( at the t.ime of transplanting.During the initial 6 days af' er transplanting seedlings were kept under a light shade and irrigated daily with plain tap water.Treatment started August 2, 1962.TREATMENTS Each spe: ies was irrigated with three different solutions of liquid fertilizer, plus a control of plain tap water.The fertilizers and their composition are listed in Table 1.ahl«-Upon r",""t.
Twenty gallons of each fertilizer l'olucion and the control treatment wert: prepa red initially and replenished periodically.
Each solution was applied to 11 seed lings 01 each species e'very day for 60 ' days a n :1 twice w€ekly ' thereafter.TIle !'eedling, w(;'re placed in a perforated polyethelem' pi il which was immersed slowly into the fertiliz ('1' solu-1 ion tl) a level assuring com pIt•' C ~ I urat' on of the vermiculite without Wt't t illg the stems.When the vermiculite was saturated 'he pail was lifted out of the solution and allowed to drain.The three solutions using the ca mmercial fertilizer~ were .stirred th:)roughly ea :-h day before irrigation, to disper:e a prec:pita.;ewhich formed in the bottom of the contaimr.A plastic and meshwire scre.'n was k<'pt over the plants to reduce sola r radia .. ion nnd prev~mt •kaching of th J !:utriC:;lts by heavy rains.Th:> group3 werz )'('-p -l' itionerl CARIBBEAN FOK&"iTEH daily to minimize the effect of variation)! in the micruenvironment.

MEASUREMENTS
The height of each plant was meaRureo to the nearest millimeter, after immersion.('\'er;: fourth day for the first 60 days and w('ekl v thereaft-er.Each plant was measured from a marked spot on the surface of the vermiculite 1:> the apex of the terminal leader, not including leaves or leaflets.
Immediately after the final measuremen ~ at 85 days, each plant was lifted from the pot, cut in two at the ground line, and e8!:'h part weighed.Oven dry weights were det.ennillfld for each group.That is, roots of aU plants of each species and of each fertilizer w~re weighed together, not individually.

RESULTS
Cumulative height growth is shown in Figure 1.Although the magnitude of the growth differed greatly, the rank of the fer tilizer solutions was the same for all 'hree !-' pecies.Height growth varied significantly with species and with nutrient solution .