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试验证明,采用多量氮肥作口肥(在缺磷土壤上配合施磷肥)可使高粱早熟5～13天.1979年,我们在高粱不同时期缺肥试验中观察到,高粱拔节初以前缺氮,以后再补施氮肥,比各营养阶段均衡供给氮肥处理的晚熟5～12天.在播前施氮肥比拔节初和“挑旗”期追氮肥,可提早成效13～16天.
Experiments show that the use of large amounts of nitrogen fertilizer as fertilizer (phosphate fertilizer in the phosphorus deficiency) can make sorghum premature 5 to 13 days in 1979, we observed in different periods of sorghum lack of fertilizer observed sorghum before the beginning of jointing nitrogen, Fertilize later than the nutrition stage of balanced supply of nitrogen fertilizer treatment of late 5 to 12 days in the pre-sowing than the early stage of jointing and “flag-picking” top-dressing nitrogen can be effective for 13 to 16 days.