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高粱生长与发育过程中,有一个需肥的高峰期,同样,追施化肥后也有一个肥效高峰期,如果这两个高峰期一致,施肥的经济效益最高。据试验,高粱需肥高峰在穗分化的第三阶段(即枝梗原基分化开始),肥效高峰期在不结合灌水的情况下,一般是在施后7～20天,整个肥效期能维持40天左右。为确定杂交高粱追肥的最经济有效时期,1974年我们在所内进行了晋杂5号高粱穗分化的剥离观察。各分化阶段与叶龄的关系如下:
In the process of sorghum growth and development, there is a rush to be fertilized. Similarly, there is also a fertilization peak after topdressing fertilizers. If these two peaks coincide, the economic benefits of fertilization are the highest. According to the test, the peak of fertilizer-needed sorghum is in the third stage of spike differentiation (ie, the initiation of branch-stem primordia differentiation). When the peak of fertilizer-efficiency is not combined with irrigation, it is generally 7 to 20 days after application, and the entire fertilizer period can be maintained 40 days or so. In order to determine the most economic and effective period of hybrid sorghum topdressing, in 1974, we carried out exfoliation observation of Jinza 5 sorghum spike differentiation. The relationship between the stages of differentiation and leaf age is as follows: