Observing the leaf to identify rapeseed deficiency
1. In the absence of phosphorus, the rapeseed leaves were small, with uneven shrinkage, dark green leaves, purple petiole, and eventually dark purple sturdy leaves. Severe whole plants withered and died. Acres may apply superphosphate 25-30 kg or foliar spray 0.3% potassium dihydrogen phosphate solution 2-3 times. Second, the lack of boron, the rape leaf shape is small, thick and crisp flesh, leaves the end of the reeling, the leaves purple to purple blue, and finally developed into a purple blue spot. Can use 0.1%-0.2% borax solution or boric acid solution 50-60 kg foliar spray. Third, in the absence of potassium, the early rapeseed leaves showed yellow-white spots, and the cobs and pale brown spots gradually appeared at the tips of leaves and leaves, and the whole plant withered when severe. Can be used to recover 7-10 kilograms of potassium chloride or 75-100 kilograms of plant ash. Flood Light Camera,Cctv Flood Light Camera,2Mp 3Mp Flood Light Camera,Waterproof Flood Light Camera Shenzhen Zuomi Technology Co., Ltd. , https://www.leftriceptz.com