不同生育期施用"奥普尔"对夏大豆生长发育的影响

用奥普尔液肥处理土壤，可提高大豆出苗率９．１％。除鼓粒期外，其余生育期使用该液肥，株高降低，分枝数增加，株英数增加百粒重降低；而鼓粒期施用，株高、分枝数没有变化，株英数和百粒重增加，综合效果，大豆施用奥普尔液肥，株粒数增加，产量提高，经济效益提高。以上土壤处理和花期喷施效果最好，增产率分别达１１．８％和９．６％；两次是复加施用，增产率达１３．６％，投放产出比达１：５．３。

EFFECT OF OPAL APPLICATION IN DIFFERENT GROWTH STAGES ON GROWTH AND DEVELOPMENT OF SUMMER SOYBEAN

Soybean germination rate may be increased to 9.1% through soil treated with Opal liquid fertilizer. The plant height and 100 seed weight reduced and the number of branches and pods were increased by applying Opal liquid fertilizer during the growing period except for pod filling stage. There was no change of plant height and number of branches and but number of pods was reduced and the number of seeds per pod and 100 seed weight were raised by applying the fertilizer in the stage of pod filling. The result indicated that the number of seed per plant, yield and economic benefit may be enhanced by using of the fertilizer. The yield increased 11.8% and 9.6% respectively when the fertilizer was applied in soil before seeding and sprayed in the flowering stage, and the yield increased 13.6% when those two fertilizer treatments were applied in soybean growth period.