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杂交高粱的整个生育过程中,有一个需肥高峰。在这个时期能否满足杂交高粱对肥料的需要,对其产量影响极大。据内蒙农牧学院农学系利用同位素P~(32)示踪证明,高粱的需肥高峰和追肥的最大效应是在拔节期。植株在拔节期的吸肥量占总吸肥量的47.1%,孕穗期占24.6%,苗期占21.1%,花期占7.3%。为了进一步掌握拔节后(10—20片叶)近30天内追肥的最大效应期,我们对晋杂5号高粱进行了穗分化的剥离观察。结果表明,幼穗分化共分五个阶段。第一阶段:十叶之前,这是营
Hybrid sorghum during the entire reproductive process, there is a fertilizer peak. In this period can meet the needs of hybrid sorghum fertilizer, its output has a tremendous impact. According to the Department of Agronomy, Inner Mongolia Agriculture and Animal Husbandry Department of isotope P ~ (32) tracer to prove that sorghum need peak fertilizer and top-dressing effect is at the jointing stage. The absorption of plants at the jointing stage accounted for 47.1% of the total absorbed fertilizer, booting stage accounted for 24.6%, seedling stage accounted for 21.1%, flowering accounted for 7.3%. In order to further understand the maximum effect period of topdressing after nearly 20 days after jointing (10-20 leaves), we observed the spike differentiation of Jinza 5 sorghum. The results showed that panicle differentiation is divided into five stages. The first stage: ten leaves, this is camp