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油菜每个单株开花数有数百至千朵,但花器脱落很严重,一般成角率不过40—50%。如何防止和减轻油菜花器的脱落,争取荚多粒大高产呢?南县的栽培经验是: 一、适时播种,避过春季气温多变的危害油菜开花适宜的气温为12—18℃;过高或过低,都会使花粉生活力降低,影响受精作用。气温10℃以下,开花数显著下降,7℃以下,落花增加;0℃以下或高于21℃,蕾花角大量脱落。南县春季气温多变,寒潮频繁,据气象资料记载,历年日平均气温稳定通过10℃的日期为3月25日;3月7℃至0℃以下的极端最低温度出现在上旬的年机率为68%,出现在中旬的年机率为16%;3月超过21℃极端高温出现在上旬的年机率为12%,出现在中旬的年机率为20%。
Rape per plant flowering number of several hundred to one thousand, but the flower off is very serious, but the general angle of 40-50%. How to prevent and reduce rape flower shedding, pod for large grain yield it? Nanxian cultivation experience is: First, timely sowing, to avoid the changing temperature in spring Harmful rape flowering suitable temperature is 12-18 ℃; too high Or too low, will reduce pollen viability, affecting fertilization. Temperature below 10 ℃, flowering number decreased significantly below 7 ℃, falling flowers increased; 0 ℃ below or above 21 ℃, a large number of flower buds off. According to meteorological data, the average daily temperature of the calendar year passed the 10 ℃ date of March 25; the annual minimum temperature in March of 7 ℃ to below 0 ℃ appeared in the first ten days as 68% in the middle of the year, and 16% in the middle of the year. In March, the extreme high temperature above 21 ℃ occurred in the first ten days of the year, and the annual probability of emergence in the middle ten days was 20%.