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1975年—1978年我们针对皖南地区主要作物水稻(早稻) 对氮磷钾的效应,作了多点试验.以研究红壤性稻田的自然供肥状况及其对氮、磷、钾肥的效应和水稻高产的科学施肥技术,为大幅度地提高水稻单位面积产量提供合理施肥的依据.本文着重探讨下面几个问题,即氮肥、磷肥、钾肥效应与水稻产量、氮磷钾营养平衡的关系. 一、试验条件与方法(一) 试验地区的基本情况: 试验田选择在宣城与广德之间低丘陵地带红色粘土的水稻田.该地区气候条件较好,年平均温度15—17℃,无霜期约
From 1975 to 1978, we conducted multi-point experiments on the effect of N, P and K on the main crop rice (early rice) in Southern Anhui Province to study the effects of N, P and K fertilizers and the effects of N, P, High-yielding scientific fertilization techniques provide the basis for a reasonable increase of yield per unit area of rice.This paper focuses on the following issues: the relationship between the effects of N, P and K fertilizers and the balance of N, P, Test conditions and methods (I) Basic conditions of the experimental area: The experimental field is selected from paddy fields with red clay in the low hills between Xuancheng and Guangde.The climatic conditions in this area are good with annual average temperature of 15-17 ° C and frost-free period of about