Wheat micro fertilizer application

During the whole process of growth and development of wheat, it is necessary to observe the wheat leaves diligently and skillfully apply micronutrients to ensure normal wheat growth and development. "Three-color" Shrinkage Leaf: When the wheat grows short of zinc, the leaf margin of the wheat leaf is shrunken or distorted. The veins from green yellow to white are on both sides of the leaf veins. It is a striped strip of yellow, white and green, and it is delayed and spiked. Small particles, the lack of zinc, immediately with 0.3% to 0.4% of zinc sulfate solution sprayed on the leaf surface 2 to 3 times. Yellow and white leaves: This type of leaf is caused by iron deficiency. At the beginning, the veins of the young leaves lose green and yellow, the veins remain green, after which they are completely chlorotic, and sometimes the entire leaf is yellow-white. For this can be used 0.75% ~ 0.9% of ferrous sulfate solution for spraying 2 ~ 3 times. Sharp white edge of yellow leaves: the tip of the blade turned white, yellow-gray edge, this leaf is caused by copper deficiency. When it is severe, it cannot head at the heading stage. The prevention and control method is: using 0.03% to 0.04% of copper sulfate solution for spraying 2 to 3 times. Softly hanging leaves: When wheat is deficient in manganese, the leaves are soft and sagging, and veins change from green to yellow. This can be immediately sprayed with 0.1% manganese sulfate solution twice. Yellow-white spotted leaves: When wheat is deficient in molybdenum, the leaf color becomes lighter, small yellow-white spots appear along the veins of the leaves, and gradually become linear or flaky, and finally the leaves are dried up. For the phenomenon caused by this lack of molybdenum, the prevention and control method is as follows: 0.05% to 0.1% ammonium molybdate solution is sprayed on the leaves for 2 to 3 times. Purple-brown leaf: When the boron deficiency occurs in wheat, the growth period is delayed and the leaf tip is purple-brown. At the same time, its flower is not loose powder, pollen is less or deformed, sometimes no pollen, lateral enlargement of ovary, glume is not closed early, withered later. Can be used boric acid 50 ~ 100 grams of water 50 ~ 60 kilograms of foliar spray, usually in the wheat seedling period, heading period of each spray once. China Agricultural Network Editor

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