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为了弄清磷肥在轮作周期中的当季效果及后效的延续时间,明确磷肥的合理施用问题。我们从1978年春、夏季开始进行磷肥定位试验。现将三年来的试验结果分述于后。
In order to clarify the seasonal effect of phosphate fertilizer in the rotation cycle and after the effect of the continuation time, a clear issue of rational use of phosphate fertilizer. We started from the spring of 1978, summer phosphate fertilizer positioning test. Now three years after the test results are summarized in later.