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本文根据三年田间试验观察资料,分析了北京地区温度条件与冬小麦各穗分化期之间的持续日数,小穗分化速率及与分化小穗数目的关系。并确定了穗不同分化时期有利于小穗分化的温度指标。研究表明,单棱期至护颖分化期为决定小穗数目的关键时期。在该时期中,日平均气温≤7.5℃的日数愈多,分化期间的持续时间愈长,则小穗数愈多。同时,从小花分化到顶端小穗分化期间的日平均气温≤10.5℃日数愈多,持续时间愈长,也有利于小穗分化。
Based on the data from field experiments in three years, the paper analyzed the relationship between the number of persimmon days, the rate of spike differentiation and the number of spikelets in winter in Beijing. And identified the spikelet differentiation index during different differentiation stages of spike. Studies have shown that the single-rib stage to protect Ying differentiation period is the key period to determine the number of spikelets. During this period, the greater the number of days with a mean daily temperature <7.5 ° C and the longer the duration of differentiation, the greater the number of spikelets. At the same time, the daily average temperature during the differentiation from floret to apical spikelet is less than or equal to 10.5 ℃, the longer the duration and the longer the spikelet differentiation.