There are many elements required for corn growth, including: nitrogen, phosphorus, potassium, magnesium, zinc, sulfur, iron, boron, calcium, manganese and so on. In the absence, it will have an adverse effect on plant growth. First, the lack of nitrogen, phosphorus and potassium in the growth process of corn is as follows: 1. The nitrogen-deficient seedlings are dwarfed, thin, and yellow-green in the leaves; the leaves turn yellow from the tips of the leaves and develop along the midrib of the leaves, forming a "V"-shaped yellowing part; causing the whole plant to be yellow and the lower tip of the leaves to die. The edges are yellowish-green; nitrogen deficiency is severe or lacks nitrogen in the critical period, the ear is small, the top grain is not abundant, and the protein content is low. 2. Phosphorus-deficient strains are sensitive and plants are dwarfed; leaf tip and leaf margin are purplish red, and the posterior lobe is dead or becomes dark purple-brown; roots are underdeveloped, the pollination of the ear is blocked, the grain is not full, and the ear is small or distort. 3. The leaf tip and leaf margin of the lower potassium deficiency leaves are yellow or red and scorch, and the late plants are easy to lodging, the ear is small, and the top is not well developed. Second, to avoid the lack of corn disease to take the following measures: 1. The correct diagnosis should be based on the plant analysis and soil test results and the lack of symptoms. 2. Promote the use of composted compost or decomposed organic fertilizers. The use of formula fertilization technology, according to the amount of corn supplement fertilizer deficiency. 3. In the initial stage of the deficiency of the disease, leaf fertilizer can be sprayed symptomatically on the foliage. Cup Mask Ear Belt Machine(Single Point) Earloop Spot Welding Machine,Cup Mask Ear Belt Machine,Kn95 5 Layers Fold Flat Mask Machine,Kn95 Filters Cup Respirator Machine Ningbo Dokee Mask Machine Co., Ltd. , https://www.autrendsmac.com