作物花期施药要择时一些农作物如花期施药时间不对头，会影响授粉与受精，还会产生药害。这样，不仅起不到防病治虫增产作用，反而浪费人力、物力、财力。因此，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。都会使花的柱头渗透压降低，... Crops flowers to choose the time to choose Some crops such as flowering time is wrong, will affect pollination and fertilization, but also produce injury. In this way, not only can the disease-preventing and pest-killing effect increase, but wasting manpower, material and financial resources. Therefore, the application of crop florescence must master the right time. 1, cotton flowers generally morning, such as spraying or spraying fertilizer. Will make the head of the flower osmotic pressure lower, ...