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多年生产实践证明,在山东花生主要产区的中肥田、瘦田上施用磷肥,对花生有显著的增产效果。但是,在磷肥的施用量上,同一地区差异很大,有的每亩施用4斤左右P_2O_5的成品磷肥,有的施用6—8斤,有的在10斤以上。为了有效地提高花生产量,为经济合理施用磷肥提供依据,我们于1964年应用同位素示踪法,对具有一定肥力基础的中肥田不同磷肥施用量的肥效问题进行了研究,现将初步结果整理如下:
Years of production practice has proved that in the peanut main producing areas of Shandong fertilizer field, leaching fertilizer on the lean, peanut significantly increased yield. However, in the application of phosphate fertilizer, the same area vary widely, and some 4 kg per acre of P_2O_5 finished phosphate fertilizer, and some applications 6-8 kg, and some more than 10 pounds. In order to effectively improve the yield of peanut and provide the basis for economical and rational application of phosphate fertilizer, we applied isotope tracing method in 1964 to study the fertilizer efficiency of different fertilizers in medium fertility field with certain fertility. The preliminary results are summarized as follows :