The color of corn seedlings is mostly dark green, and if improperly managed, lack of fertilizers, or abnormal weather, the color of corn seedlings will change to yellow, red, white, purple, light green, yellowish green and other abnormal colors, that is, so-called yellow leaf seedlings, whitening. Seedlings, purple leaf seedlings, stiff leaf seedlings, yellow-green seedlings. The abnormal color of corn seedlings not only affects the normal growth of corn, but also reduces the yield and quality. Therefore, we must try to control it.
Yellow leaf seedlings at the beginning of the seedlings light green, gradually yellow, severe leaves dead. The harm is caused by empty stalks or baldness. Causes: The seeds are not full, the seedlings are not strong; the sowing is too deep, and the emergence is weak; the density is too high, which affects fertility; and the soil lacks fertilizer. Control measures: First, the selection of fine seeds before sowing, single-seeded grains, mold grain, bad grain, small grain, to ensure that the seeds of the degree of purity, purity are more than 98%, the germination rate of more than 90%. The second is germination sowing, seed coating or fertilizer soaking. The third is the appropriate time seedlings, in the 3 to 4 leaves of corn when removed seedlings, weak seedlings, diseased seedlings and field weeds. The fourth is after the seedlings, make-up nitrogen fertilizer, and promote seedlings sooner. The fifth is that there are dry clumps before and after emergence, and dry clumps should be broken in time.
There are white stripes on the leaves of the albino seedlings. The severe white leaves of the whole plant are wilted and finally dry, causing the plants to die and the particles not to be collected. The reason for this is the lack of zinc in the soil. Control measures: The first is to use zinc fertilizer as a seed fertilizer, with 1.5-2.0 kg of zinc sulfate per 667 square meters, mixed with 15-20 kg of fine soil, sprinkled next to the seeds when the corn is sown. The second is zinc fertilizer seed dressing, with 2-3 kilograms of warm water, dissolve 1 kilogram of zinc fertilizer, mix 25 kilograms of corn seed, and sow dry after sowing. The third is leaf spray zinc fertilizer, for the emergence of zinc seedlings, with 0.2-0.3 kg of zinc sulfate plus 100 kg of water per 667 square meters for spraying, sprayed once every 7 days, generally spray 2-3 times to make the seedlings Back to normal.
The leaves and leaf sheaths of purple leaf seedlings changed from green to red and finally to purple. They generally appeared at the 3-leaf stage of the maize and showed the most obvious at the 4-5 leaves. The roots were underdeveloped, the stems were small, the growth was slow, and the leaves changed from green to purple. Severe leaves die. Purple seedlings are mainly caused by the lack of phosphorus in the soil, the decrease of root absorption capacity, and the obstruction of chlorophyll synthesis, resulting in the transformation of leaves from green to purple, and the occurrence of purple seedlings at low temperatures after the third leaf stage. The harm of purple seedlings can lead to empty stalks and baldness of corn, affecting yield and reducing quality. Control measures: First, increase the use of phosphate fertilizer as a base fertilizer, usually 667 square meters of application of 40-50 kg of superphosphate and fermented organic fertilizer as base fertilizer. Second, foliar spraying of potassium dihydrogen phosphate, if the emergence of purple seedlings, you can use 0.2% potassium dihydrogen phosphate for spraying 2-3 times, time interval of 8 days.
The rigid leaf seedlings mainly occurred before the three-leaf stage of the seedlings. The seedlings were small in shape, light green in the leaves, not strong and fresh, and had many black roots. After transplanting, the new leaves were green, and the external leaves were yellow and stiff. Poor sex, prone to dead leaves, dead seedlings. The reasons leading to stiff leaf seedlings are: excessive soil, excessive use of chemical fertilizers, excessive use of seed fertilizers, poor segregation of seed and fertilizer, soil drought, and poor development. Control measures: First, the maturity of the organic fertilizer in the seedling stage, with or without urea as the base fertilizer. The second is to maintain the proper temperature and humidity in the soil and transplant the strong seedlings. The third is reasonable irrigation, weeding, disease prevention and pest control. The fourth is the timely spraying of foliar fertilizer.
The seedlings of yellow-green seedlings were thin and narrow, with short stature. The leaves showed yellow-green stripes. In severe cases, the leaves were dark brown, and they finally died of coke. Symptoms start with the lower blade and gradually shift to the upper blade. The hazards of such seedlings are likely to cause corn lodging. Control measures: First, increase potassium fertilizer. Usually based on the profit and loss of soil potassium, determine the amount of potash fertilizer, if no potash can be supplemented with plant ash. Second, for severe shortage of potassium, seedlings should be sprayed with potassium dihydrogen phosphate and ash leaching solution at the 3rd leaf stage.
Yellow leaf seedlings at the beginning of the seedlings light green, gradually yellow, severe leaves dead. The harm is caused by empty stalks or baldness. Causes: The seeds are not full, the seedlings are not strong; the sowing is too deep, and the emergence is weak; the density is too high, which affects fertility; and the soil lacks fertilizer. Control measures: First, the selection of fine seeds before sowing, single-seeded grains, mold grain, bad grain, small grain, to ensure that the seeds of the degree of purity, purity are more than 98%, the germination rate of more than 90%. The second is germination sowing, seed coating or fertilizer soaking. The third is the appropriate time seedlings, in the 3 to 4 leaves of corn when removed seedlings, weak seedlings, diseased seedlings and field weeds. The fourth is after the seedlings, make-up nitrogen fertilizer, and promote seedlings sooner. The fifth is that there are dry clumps before and after emergence, and dry clumps should be broken in time.
There are white stripes on the leaves of the albino seedlings. The severe white leaves of the whole plant are wilted and finally dry, causing the plants to die and the particles not to be collected. The reason for this is the lack of zinc in the soil. Control measures: The first is to use zinc fertilizer as a seed fertilizer, with 1.5-2.0 kg of zinc sulfate per 667 square meters, mixed with 15-20 kg of fine soil, sprinkled next to the seeds when the corn is sown. The second is zinc fertilizer seed dressing, with 2-3 kilograms of warm water, dissolve 1 kilogram of zinc fertilizer, mix 25 kilograms of corn seed, and sow dry after sowing. The third is leaf spray zinc fertilizer, for the emergence of zinc seedlings, with 0.2-0.3 kg of zinc sulfate plus 100 kg of water per 667 square meters for spraying, sprayed once every 7 days, generally spray 2-3 times to make the seedlings Back to normal.
The leaves and leaf sheaths of purple leaf seedlings changed from green to red and finally to purple. They generally appeared at the 3-leaf stage of the maize and showed the most obvious at the 4-5 leaves. The roots were underdeveloped, the stems were small, the growth was slow, and the leaves changed from green to purple. Severe leaves die. Purple seedlings are mainly caused by the lack of phosphorus in the soil, the decrease of root absorption capacity, and the obstruction of chlorophyll synthesis, resulting in the transformation of leaves from green to purple, and the occurrence of purple seedlings at low temperatures after the third leaf stage. The harm of purple seedlings can lead to empty stalks and baldness of corn, affecting yield and reducing quality. Control measures: First, increase the use of phosphate fertilizer as a base fertilizer, usually 667 square meters of application of 40-50 kg of superphosphate and fermented organic fertilizer as base fertilizer. Second, foliar spraying of potassium dihydrogen phosphate, if the emergence of purple seedlings, you can use 0.2% potassium dihydrogen phosphate for spraying 2-3 times, time interval of 8 days.
The rigid leaf seedlings mainly occurred before the three-leaf stage of the seedlings. The seedlings were small in shape, light green in the leaves, not strong and fresh, and had many black roots. After transplanting, the new leaves were green, and the external leaves were yellow and stiff. Poor sex, prone to dead leaves, dead seedlings. The reasons leading to stiff leaf seedlings are: excessive soil, excessive use of chemical fertilizers, excessive use of seed fertilizers, poor segregation of seed and fertilizer, soil drought, and poor development. Control measures: First, the maturity of the organic fertilizer in the seedling stage, with or without urea as the base fertilizer. The second is to maintain the proper temperature and humidity in the soil and transplant the strong seedlings. The third is reasonable irrigation, weeding, disease prevention and pest control. The fourth is the timely spraying of foliar fertilizer.
The seedlings of yellow-green seedlings were thin and narrow, with short stature. The leaves showed yellow-green stripes. In severe cases, the leaves were dark brown, and they finally died of coke. Symptoms start with the lower blade and gradually shift to the upper blade. The hazards of such seedlings are likely to cause corn lodging. Control measures: First, increase potassium fertilizer. Usually based on the profit and loss of soil potassium, determine the amount of potash fertilizer, if no potash can be supplemented with plant ash. Second, for severe shortage of potassium, seedlings should be sprayed with potassium dihydrogen phosphate and ash leaching solution at the 3rd leaf stage.
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