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Irrigation and nitrogen fertilization influences on soybean variety (Glicine max. L. Merr.) properties

Under field conditions in Osijek during two years were set field trials. The aim was confirm an influences of irrigation rate, nitrogen (N) fertilization and soybean varieties on grain yield and some yield components. The irrigation treatments were: control (A1) ; soil moisture content from 60% to 100% retention water capacity (RWC, A2) and soil moisture content from 80% to 100% RWC (A3). Rate of N was sub sub-factor: 0 (B1) ; 100 (B2) and 200 kg N ha-1 (B3), were applied. Una (C1) and Anica (C2) soybean varieties was sub-sub factor (C). Mean soybean grain yields were 3082 kg ha-1 and 3538 kg ha-1 in years 2006 and 2007, respectively. Irrigation resulted by high statistically difference in soybean grain yield in both investigated years and between all treatments. Variety Una yielded (3179 kg ha-1) statistically very higher in 2006. Interactions AB, AC and BC on pod number plant-1 were significant in one year, only. Thousand grain weight (g) resulted with high significant higher value on variety Una than variety Anica in both years. N fertilization resulted by statistical very significant effect of grain weight plant-1 in year 2007, while variety Una resulted by statistically very significant higher grain weight plant-1 than variety Anica in year 2006. Interactions AB and BC showed statistically very significant or significant differences in grain weight plant- 1. Irrigation (in year 2007) and N fertilization (in year 2006) had significant different number of grain plant-1. Variety Una had statistically very significant higher number of grain plant-1 than variety Anica in year 2006, only. Interactions AB and AC were shown statistically very significant differences in number of grain plant-1, in year 2007, but BC interaction were in both years.

Soybean ; irrigation ; nitrogen fertilization ; yield ; yield components

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