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为提高水稻对氮素肥料的利用率,探讨穗肥施用时期对水稻产量及构成要素的影响,寻求最佳的穗肥施用时期。我们于1981～1982年在本所进行了本试验研究。 一、试验材料与方法 供试品种:粳稻西农175,叶龄为16 (包括不完全叶在内,下同)。 肥料用尿素,按15斤纯氮分2次施用,第1次于分蘖始期,占追肥量的67％。第2次分别于叶龄指数为73.8％、83.1％、88.1％、94.4％及抽穗期施用,占追肥量的33％。
In order to improve the utilization rate of nitrogenous fertilizer in rice, the influence of the period of panicle application on the yield and components of rice was explored, and the best period of panicle application was sought. We conducted this pilot study in our firm from 1981 to 1982. First, the test materials and methods tested varieties: japonica rice 175, leaf age of 16 (including incomplete leaves, the same below). Fertilizer with urea, according to 15 kg of pure nitrogen divided into two applications, the first time in the tillering, accounting for 67% of the amount of dressing. The second time, the leaf age index was 73.8%, 83.1%, 88.1%, 94.4% and heading date, accounting for 33% of the top dressing.