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用放射性核素~(32)P示踪研究表明,在5—25℃范围内,玉米苗期对磷的吸收随温度升高而增加,呈极显著正相关,相关系数为0.9747。苗期叶面喷磷能促进根系对磷的吸收,提高玉米的抗寒能力。喷磷后0.5小时遇50mm/h降雨,磷素冲刷率为42％,一般不需要重新喷磷。
The results of radionuclide ~ (32) P tracing showed that there was a significant positive correlation between P uptake and P uptake in corn seedling at 5-25 ℃. The correlation coefficient was 0.9747. Spraying foliar phosphorus at seedling stage can promote the absorption of phosphorus in roots and improve the cold resistance of maize. 0.5 hours after spraying phosphorus encountered 50mm / h rainfall, phosphorus flushing rate of 42%, generally do not need to re-spray phosphorus.