一些大田农作物花期施药时间掌握不好,会影响授粉与受精,还会产生药害。因此,农作物花期施药一定要掌握好恰当的时间。1.棉花。一般上午开花,如上午喷药或喷肥,会使花的柱头渗透压降低,花粉破裂,造成子房不能受精而脱落。所以,棉花开花时施药应在下午4时以后进 Some field crops florescence application time is not good, will affect the pollination and fertilization, but also produce injury. Therefore, the crop florescence application must master the right time. Cotton Generally morning flowering, such as morning spraying or fertilizer, will make the stigma lower osmotic pressure, pollen rupture, resulting in ovary can not be fertilized and fall off. Therefore, cotton flowering should be applied after 4 pm