保护性施氮对大豆生育和产量的影响

EFFECT OF PROTECTIVELY APPLIED NITROGEN ON GROWTH AND YEILDS OF SOYBEAN

首次利用脲酶抑制剂──氢醌和调节麦秸的＂氮因子效应＂，作为大豆保护性施氮（尿素〕的科学依据。通过砂壤土盆栽和白浆土田间微区试验，初步验证了保护性施氮应用前景。白于协调了大豆生育前期和后期对根瘤固氮和土壤（肥料）供氮的需求，促进了大豆植株Ｃ─Ｎ同化，从而为籽粒蛋白质的合成创造了一个协调供氮的营养生理条件，获得比常规施氮增产１０％～５０％的效果。

The principle protectively applied nitrogen to soybean wasbased on the experiments either adding urease inhibitor, the hydroquinone(HQ) in urea or regulating high ratio of C/N as the 'nitrogen factoreffect' of the wheat-straw. The applied foreground of protectivelyapplied nitrogen to soybean was verified pritmarily under the differentconditions either in the sandy loam soil in the pots or in theAlbic soil in the fields. Thus, only though the full development ofsoybean symbiotic system of nitrogen fixation as well as the improvementof nitrogen provided in the soil, can we hope to coordinate the bothnitrogen resources to supply the soybean for grain protein. The yield ofsoybean was increased up 10-50% in the experiment than that in theordinary rules applied fertilizer nitrogen.