Abnormal maize seedlings not only affect the yield, but also reduce the quality of corn. They must try to control it. Purple seedling seedling leaves, leaf sheath from green to red, and finally purple, 3 leaf stage began to appear symptoms, 4-5 leaf stage outstanding, symptoms are obvious, roots are underdeveloped, small stems, slow growth, leaves from green to purple, and finally Withered. Purple seedlings produce mainly phosphorus deficiency in the soil, the ability of root absorption decreases, and the synthesis of chlorophyll is blocked, causing the leaves to turn green from purple to purple. After the third leaf stage, purple seedlings are prone to occur at low temperatures. Purple seedlings can cause corn empty stalks and baldness and affect yield. Reduce quality. To increase phosphate fertilizer and improve ground moisture, generally apply 40-50 kg of superphosphate and fermented organic fertilizer as base fertilizer for prevention. Once purple seedlings appear, 0.2% potassium dihydrogen phosphate may be used for foliar spraying. 2-3 times. Red seedling corn grows slowly after emergence, leaves are small, roots are poor, leaf color becomes pale, and then turns red. In general, due to low temperature, the root absorption capacity is weakened, the metabolism of seedlings is slow, the chlorophyll is reduced, and the leaves are red. For mulching or seedling transplanting, germination sit water, or use machine sowing, grab the flank, sowing in the high yield period. Seedlings of young maize seedlings are light green in color at the beginning and gradually turn yellow. When they are severe, they die, and they easily cause empty stalks or baldness. The causes are: the seeds are not full and the seedlings are not strong; the seeds are too deep and the seedlings are weak; the density is too high, which affects fertility. Soil lack of fertilizer. Preventive measures: Select good seeds, purity, purity are all above 98%, germination rate is above 90%, and remove grains, granules, diseased grains, sowing wind, screening, germination sowing, early seedlings, early set seedlings, and more shovels More è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ è¶Ÿ åˆç† åˆç† åˆç† ã€‚ ã€‚ ã€‚ ã€‚. The stiff seedlings mainly occur before the 3-leaf stage, and the seedlings are not strong and young, they are long and stiff, they have many dark roots, and they are thin and weak. When they die, they die and die. Hard ground, stiffness, excessive fertilizer use, excessive fertilizer, poor segregation of seeds and fertilizers, drought after sowing, poor fertility, empty stalks, small rods, and small grains all contribute to the formation of a stiff seedling. Base fertilizer should be dominated by organic fertilizer, so that agricultural fertilizer, chemical fertilizer, micro-fertilizer combination, nitrogen, phosphorus, potassium combination; base fertilizer, seed fertilizer, top dressing combination, and reasonable irrigation, weeding, disease prevention and pest control. White seedlings usually start from the 4 leaves. The leaf color of the new leaf is pale, yellowish-white, and the leaves appear pale yellow and light green stripes on the 5th to 6th leaves. The purple stripes appear on the base, and the leaves are thin and translucent white. The plants are dwarfed, the internodes are shortened, and the leaves are clustered. In severe cases, the leaves are dry, causing the plants to die and the particles not to be collected. It is mainly due to soil zinc deficiency. Control measures: First, zinc fertilizer for seed fertilizer, 1.5-2.0 kg of zinc sulfate per acre, can be mixed with urea, diammonium, ammonium nitrate, etc. as a seed fertilizer, but the separation of species and fertilizer to prevent burning seedlings; second is zinc Fertilizer seed dressing, 1 kg of zinc sulfate mixed with 25 kg of corn seed, the method is to use 2-3 kg of warm water, dissolve 1 kg of zinc fertilizer, until all dissolved, the zinc fertilizer solution is evenly sprayed onto the corn seed, so that the seed surface are Dipped with zinc fertilizer, dried after sowing; third leaf spray zinc fertilizer, 100-150 grams of zinc sulfate dissolved in 50 kilograms of water, dubbed a 0.2% -0.3% concentration of zinc sulfate solution, in the maize seedling stage or jointing period Shi, spraying 10 kg per mu is appropriate.
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