Response of two Cultivars of Soybean (Glycine Max (L.) Merr) to Leaf Nutrition with boron and Nitrogen Fertilization.

Abstract

Field experiment was conducted in loamy silty clay soil during the summer season of 2003 at AL-Garma section of falluja District to investigate the effect of three levels of boron leaf nutrition (0, 0.5, 1) kg B. ha-1 in boric acid formula (H3BO3) 17% Boron and four levels of Nitrogen fertilizer (0, 50, 100, 150) Kg N. ha-1 in the form of urea fertilizer CO(NH2)2 (46%N) on growth characters, yield and its quality for two soybean cultivars (Taka2, Soya IPA). Randomized Complete Block Design. in split-split arrangement was used in three replicates. Cultivars occupied the main plots and nitrogen fertilizer in the sub-plots while boron levels occupied the sub-sub plots.Soya IPA cultivar gave the highest averages for the most investigated characters; This cultivar gave 3375 kg. ha-1 seed yield compared with Taka 2 cultivar (2463.30 kg. ha-1) .Addition of nitrogen fertilizer at 150Kg N. ha-1 significantly affected (P> 0.05) on all growth charcters’ yield and its components’ Seed yield and protein AT this level increased by 59% and 57% respectively from that of the control treatment which gave the lowest mean of them.Spraying with boron at level (I kgB. ha-1) lead to asignificant superiority (P< 0.05) in the most of the growth and yield characters and gave the highest ahigh percentage of fertility percentage (93.24%) and seed yield (3577.40 kg. ha-1) as compared with the check treatment (2362.00 kg. ha-1) while spraying boron at (0.5 Kg B. ha-1) increased in seed protein percentage to 34.91% .The interaction between cultivars × Nitrogen fertilizaion × boron spraying had signifant effect (P< 0.05) in all characters’ Soya IPA fertilized with 150 kg N. ha-1 + 1 kg B. ha-1 gave 100% fertility in pods and gave the highest plant height, no. of seeds / pod, 100 seeds weight, seed yield and protein (5219.30, 806.00 kg. ha-1 respectively compared with Taka 2 which gave the lowest means for the above charters when was untreated unsprayed with nitrogen and boron.From these results, it can be concluded the IPA Soya cultivar responded positively to nutrients addition and other growth condition and gave a 100%. Fertility and high seeds yield and components under the high level of N and boron and gave an increase of 2 ton. ha-1 seed yield and 622.00 kg.ha-1 protein above Ta;a 2 growing under the same condition.