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植物缺少氮素,往往会表现出明显的特征,稍有经验的农民都知道,一旦棉花叶子变黄变薄,这就是缺氮的象征,须要浇施速效氮肥.可是对于磷肥,在一般性的缺肥情况下却没有那种明显的特征可辨,几乎连最有经验的劳动模范亦很难看出那一块棉地缺磷,那一块棉地磷肥很充足.而实际上,磷肥对于棉花的增产作用却极其显著,如据本县去年试验结果,于6月29日每亩追施25斤过磷酸钙的比对照区(每产籽棉234.9斤)增产10.1%;每亩追肥50斤的比对照增产11.1%.为了简单易行的探明植株体内磷素情况,给施用磷肥提供参考,特作了植物液汁分析.
Plants lacking nitrogen tend to show obvious characteristics, and some experienced peasants know that once the cotton leaves turn yellow, they are a symbol of nitrogen deficiency, requiring the application of quick-acting nitrogen fertilizers, but for phosphate fertilizers, in general In the absence of such a distinct feature, there is no obvious feature. Even the most experienced model worker can hardly see the lack of phosphorus in that piece of cotton, and the amount of phosphate fertilizer in that piece of cotton is sufficient. In fact, the increase in phosphorus for cotton The effect was extremely significant. According to the results of last year’s trial, the yield of superphosphate 25 kg per acre on June 29 was 10.1% higher than that of the control area (234.9 kg per acre); 50 kg of top dressing per acre was higher than that of the control An increase of 11.1% .In order to easily find out the situation of phosphorus in plants, to provide a reference for the use of phosphate fertilizer, especially for plant juice analysis.