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黄瓜是由雌花经受粉后发育形成的,雌花数最的多少,直接影响黄瓜的产量。因此,应采取适当措施,增加黄瓜雌花分化量,为提高黄瓜产量打下基础。黄瓜的花芽分化开始于发芽后10日左右,当第1叶展开时,生长点已分化12节,其中除最上3节外,各叶腋均已有花芽分化,但性型尚未确定。当第2叶展开时,叶芽已分化至第14～16节,同时,第3～5节花的性型已确定,到第7叶展开时,第26节叶芽已分化,花芽分化至第23节,同时第16节花的性型已确定。因此,要增加雌花数量,必须在苗期采取措施,养成孕育大量雌花的壮苗,为早熟丰产打下良好基础,具体措施如下:1.苗期夜间低温处理即在第1叶至第4～5叶时,也就是说在子叶展开后10～30天当中,每天夜间用14～15℃的低温进行处理,可有效提高雌花数量。
Cucumber is formed by the development of the female flower after powder development, the most female flowers number, a direct impact on cucumber yield. Therefore, appropriate measures should be taken to increase the differentiation of female flower of cucumber and lay the foundation for the improvement of cucumber yield. The cucumber flower bud differentiation begins about 10 days after germination. When the first leaf is unfolded, the growth point has already differentiated into 12 nodes. Except for the top 3 nodes, flower buds have been differentiated in the axils of each leaf, but the nature has not been determined yet. When the second leaf unfolds, the leaf buds have differentiated to the 14th to the 16th. At the same time, the flower types of the third to the fifth flowers have been determined. When the seventh leaf is unfolded, the leaf buds in the 26th stage have differentiated and the flower buds have differentiated to the 23rd Day, at the same time section 16 flowers of the type has been identified. Therefore, to increase the number of female flowers, we must take measures at the seedling stage to develop a large number of female flower seedling breeding, lay a good foundation for early maturity and high yield, the specific measures are as follows: 1 seedlings at low temperature during the first leaf to the first 4 ~ 5 leaves, which means 10 to 30 days after cotyledon expansion, each day with a low temperature of 14 ~ 15 ℃ for processing, which can effectively increase the number of female flowers.