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为了探讨磷肥在轮作周期中的当季效果及其后效的持续时间,从1978年夏播起,在南阳、许昌、通许等市县基点上进行了磷肥长期田间定位试验,在本院进行了长期坑栽试验,现将结果总结如下: 一、试验方法 试验方案由土肥所统一制定,组织四个试验基点进行田间试验,小区面积为0.2亩,重复3次,2个处理:(1)对照(不施磷肥);(2)过磷酸钙80斤/亩。这些小区从1978年秋播开始,对半分裂,至第四茬终止,裂区处理如表1。在院内进行了坑栽试验,坑面积为1.5平方米,重复3次,从1978年春播起进行试
In order to investigate the seasonal effects of phosphate fertilizer in the rotation cycle and the duration of its aftermath, a long-term field experiment of phosphate fertilizer was carried out on the basis of Nanyang, Xuchang and Tongxu counties starting from the summer of 1978, Long-term pit planting test, the results are summarized as follows: First, the test method The test program developed by the unified soil fertilizers, the organization of four test sites for field experiments, plot area of 0.2 acres, repeated 3 times, 2 treatments: (1) (Not phosphate); (2) SSP 80 kg / mu. These plots started from the autumn seeding of 1978 and ended in the semi-division until the fourth crop. In the hospital pit test, pit area of 1.5 square meters, repeated 3 times, broadcast from spring 1978 onwards