Correct scientific control of abnormal corn seedlings

First, Huangye Miao Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

At first, the seedling leaves are light green and gradually turn yellow. When severe, the whole leaves die, which is easy to cause empty stalks or baldness. Causes: The seeds are not full, the seedlings are not strong; the sowing is too deep, the emergence is weak; the density is too large, affecting fertility; the soil is deficient. Control measures: First, select the fine seeds before sowing, pick out the glutinous grains, mildew, bad granules and small granules to ensure the purity and purity of the seeds are above 98%, and the germination rate is above 90%. The second is germination sowing, seed soaking or fertilizer soaking. The third is the time seedlings. When the corn is 3-4 leaves, the seedlings, weak seedlings, diseased plants and weeds in the field are removed. Fourth, after the seedlings, supplement the nitrogen fertilizer, and promote the early growth of the seedlings. Fifth, if there are dry clods before and after emergence, it is necessary to break the dry clods in time. Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

Second, Baihua Miao Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

Generally, from the 4th leaf stage, the leaf color of the base of the new leaf is yellowish white, 5-6 leaf stage, and the 1-3 leaves of the heart leaf appear yellowish and pale green stripes, but the veins are still green and the base appears. Purple stripes, after 10-15 days, the purple gradually turns yellow-white, the flesh is thin, and it is "white seedling". When it is serious, the whole field is white. The zinc-deficient corn plants are short, the internodes are short, the leaf pillows overlap, the heart leaves grow slowly, and the flat tops appear. In severe cases, the white leaves gradually dry up and even the whole plant dies. The cause is the lack of zinc in the soil. Control measures: First, use zinc fertilizer as seed fertilizer, use 1.5-2 kg of zinc sulfate per acre, mix well with 15-20 kg of fine soil, and sprinkle it beside the seeds when the corn is planted. The 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 to dissolve 1 kg of zinc fertilizer. After all the dissolution, the zinc fertilizer solution is evenly sprayed onto the corn seed to make the seed The surface is stained with zinc fertilizer, and dried after sowing. The third is to spray zinc fertilizer on the foliar surface. For the zinc-deficient seedlings, spray 0.2-0.3 kg of zinc sulfate and 100 kg of water per acre, spray once every 7 days, usually spray 2-3 times to make the seedlings. Back to normal. Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

Third, purple red seedlings Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

The leaves and sheaths of the seedlings turn from green to red, and finally purple. Generally, the symptoms appear in the 3rd leaf stage of the corn. The most obvious is in the 4-5 leaves, the roots are underdeveloped, the stems are small, the growth is slow, and the leaves turn from green to purple. The leaves die. The purple seedlings are mainly caused by phosphorus deficiency in the soil, the absorption capacity of the roots is decreased, and the chlorophyll synthesis is blocked, resulting in the leaves turning from green to purple. After the emergence of corn, if it encounters low temperature, it will often turn the corn leaves red or purple, but with the increase of temperature, the red seedling phenomenon will gradually ease and disappear later. In addition, the field is low in stagnant water, underground pests are harmful, the soil is too sticky, sowing too deep or too shallow, and the burning of seedlings caused by improper fertilization, improper treatment of the pesticides causing seedling poisoning, etc. will lead to red seedlings. Control measures: increase the application of phosphate fertilizer as the base fertilizer, generally apply 40-50 kg of superphosphate and fermented organic fertilizer as the base fertilizer. Once purple seedlings appear, they can be sprayed with 0.2% potassium dihydrogen phosphate for 2-3 times; level the land, excavate the drainage ditch, so that the rain stops and the water does not accumulate in the field. Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

Fourth, yellow green seedlings Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

The leaves of the corn seedlings are narrow and the plant shape is short, and the leaves appear yellow-green stripes. When the leaves are dark brown, the leaves are dead. Symptoms start from the lower leaves and gradually shift to the upper leaves, which affects the yield and is prone to lodging. The cause is the lack of potassium in the soil. Control measures: increase the application of potassium fertilizer, without the use of potassium fertilizer, can be applied in the seedling stage, the potassium deficiency is serious, in the 3 leaf stage with potassium dihydrogen phosphate or plant ash leaching solution foliar spray, the effect is immediate, increasing production significantly. Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

V. Zongye Miao Linyi Fertilizer Network Copyright

Linyi Fertilizer Network Copyright

It mainly occurs before the 3-leaf stage of seedlings, showing small seedlings, pale green leaves, increased black roots, and soft atrophy. After transplanting, in addition to the new leaves are green, the outer leaves are yellow and stiff, and the resistance is poor, and it is easy to appear dead leaves and dead seedlings. Cause: The soil is too hard; the proportion of chemical fertilizer is too large, causing dead roots and buds to appear dead seedlings; soil is dry after sowing. Control measures: Reasonably adjust the conditions of fertilizer, water and gas. The seedling stage is dominated by decomposed organic fertilizer, and no or less urea is used as the base fertilizer. Phosphate fertilizer should be applied after tanning. The soil is kept at a suitable humidity and the seedlings are transplanted. It has been necessary to strengthen the management of fertilizer and water, and promote the recovery as soon as possible, and timely replenish seedlings. Linyi Fertilizer Network Copyright

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