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花生徒长倒伏,影响产量很大.经过四年多的试验认为,在花生下针期喷施B_θ(一种植物生长延缓剂)溶液500—1000ppm,可防止徒长倒伏,增产8—10%.这个结论,数年来得到许许多多单位试验证实.本文初步探讨B_θ的增产道理.B_θ促进叶片加厚,其中以同化组织为主.B_θ显著地提高叶绿素含量,光合强度加强,植株积累干物质增多.嫩叶气孔数目增多,蒸腾加快.B_θ抑制主茎和侧枝生长,处理后半个月内不显著伸长,植株矮壮,株型紧凑,抗倒伏力强.初步认为,增产原因是:促进光合作用,抑制地上部生长,改变光合产物分配比例,使养分更多输送到荚果,增加饱果数.B_θ应用于花生的增产效果有无或高低,一方面看使用时期是否恰当,下针期最理想,过早会减产,过迟增产不显著或平产.另一方面取决于植株生势,生势旺,效果好;生势一般,效果低些;生势差,反而减产.使用时要注意.B_θ在花生中的后效可持续三代.连续多代喷施B_θ是不适当的,但喷施一代后留种不仅无妨,而且有增产的趋势.国外一些文献认为B_θ对花生增产的效应是不稳定的,甚至是减产的.文中对此有所评述.
After more than four years of experiment, it is believed that the spray of B_θ (a plant retarding agent) solution of 500-1000ppm during the peanut down-needle can prevent the leggy lodging and increase the yield by 8-10%. This conclusion has been confirmed by many units in the past few years.This paper discussed the principle of increasing yield of B_θ, B_θ promoted the thickened leaves, mainly in the assimilation tissues, B_θ significantly increased the content of chlorophyll, enhanced the photosynthetic intensity and increased accumulation of dry matter in plants The number of stomata in leaves increased, and the transpiration increased.B_θ inhibited the growth of main stem and collateral, but did not significantly extend within half a month after treatment, and the plant was short and strong with compact plant type and strong lodging resistance.According to the preliminary results, Photosynthesis, inhibition of shoot growth, changes in the proportion of photosynthate distribution, more nutrients to the pod, increase the full number of fruit.B_θ applied to the peanut yield increase or low, on the one hand to see whether the use of period is appropriate, the next needle The most ideal, too early to reduce production, late increase yield is not significant or flat production.On the other hand depends on plant potential growth, growth potential, the effect is good; potential general, the effect is lower; Note that B_θ is in peanuts Of the sustainable three generations of continuous spraying B_θ is not appropriate for many generations, but after spraying a generation not only destroying it, but also increasing the yield of some foreign literature that the effect of B_θ on peanut production is unstable, or even It is a reduction of production.