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一、苹果氮肥施用时期的研究(1960—1962) 1.由产量結果看出,以花芽分化前(6月中旬)追肥一次的增产效果最大,較对照区增产26.2％;其次为落花后和果实肥大期追肥二次的,較对照区增产22.2％。 2.追肥氮肥对叶內氮化合物的影响較大,能增加叶內总氮量和蛋白氮含量,处理間均以生育前期吸收量最高。1961年試驗,5月份叶內合氮量約占8月份含量的40—61％,1962年試驗,以6月吸收量最
First, apple nitrogen fertilization period of study (1960-1962) 1 from the yield results show that before the flower bud differentiation (middle of June) topdressing the largest yield, 26.2% increase compared with the control area; followed by the fall and fruit Fertilizer secondary dressing, compared with the control area yield 22.2%. Top dressing nitrogen fertilizer on the leaf nitrogen compounds larger, can increase the total nitrogen content and protein nitrogen content of leaves, the treatment between the pre-harvest period to absorb the highest. 1961 test, in May leaf nitrogen content of about 40 - 61% of the content in August, 1962 test, in June the highest absorption