During the whole growth period of corn, it is often caused by the lack of a certain nutrient element, which seriously hinders the growth and development of corn and affects its quality and yield.
1. Nitrogen deficiency: When the corn seedlings are deficient in nitrogen, they grow slowly, are short and thin, and the leaves are yellow-green. Nitrogen deficiency during the growth period, the old leaves from the tip of the leaf along the midrib to the base of the blade with yellow, the yellow part is "v" shaped, the leaf edge remains green and slightly curled, and finally burns and died. Control measures: medium-fertility corn fields generally apply 11 kg to 13 kg of pure nitrogen. In summer maize, it is mainly divided into three applications: the first time in the seedling stage, the application rate accounts for 20% of the total amount of nitrogen fertilizer applied to the corn; the second time is applied in the Dagu period, the application rate accounts for 70%; Three times in the flowering period of the male and female, accounting for 10% of the total amount of nitrogen fertilizer applied.
2. Phosphorus deficiency: The main symptoms of phosphorus deficiency are poor root development, slow growth during seedling stage, and symptoms of phosphorus deficiency after the five-leaf stage. The leaves are purple-red, the leaves are purple, the leaves are curled, and the phosphorus deficiency causes filaments. The extraction speed is slow, causing female flowers and male flowers to be infertile, affecting pollination, and the ears are curled, the ears are not aligned, the grains are not full, and the baldness phenomenon often occurs, and the maturity is delayed. Control measures: 5 kg of phosphorus pentoxide in general acre, all in the seedling stage and nitrogen fertilizer together.
3. Potassium deficiency: When the corn is deficient in potassium, the roots are poorly developed, the plants grow slowly, the leaves are light green and have yellow-green stripes. In severe cases, the leaf margins and leaf tips are purple, then the dryness is burning, and the middle part of the leaves is still It can be kept green, but the leaves are gradually wrinkled. The plants are thin, susceptible to disease, easy to fold, poorly developed ears, severe baldness, and low starch content in the grains. Control measures: Generally, the application of potassium oxide is 6 kg to 8 kg, all of which are applied in the seedling stage together with nitrogen fertilizer.
Fourth, zinc deficiency: white zinc seedlings will appear in severe zinc deficiency. The main feature is that in the 3rd to 5th leaf stage of maize, white seedlings begin to appear, and the young leaves of the petals are pale yellow to white, especially at 2/3 of the base of the leaves. In severe cases, the young leaves of the seedlings appear small. White spots, and rapidly expand, forming a local white area or necrotic plaque, necrosis of the mesophyll, translucent leaves, like white silk or plastic film, wind blowing easily. Control measures: The methods of applying zinc to corn mainly include basic application, seed dressing and spraying. The base is mixed with 1 kg to 2 kg of zinc sulphate per acre, and sprinkled into the seeding ditch or cavity before sowing. Each 10 kg of seed dressing is dissolved in 0.5 kg of water with 40 g to 60 g of zinc sulfate, sprayed on the surface of the seed, dried and sown. The concentration of spraying zinc sulphate solution is preferably 0.2%. Generally, it can be sprayed in the first three growth stages of seedling stage, jointing stage and heading stage, and 50 kg to 75 kg of fertilizer solution is used for the mu.
V. Boron deficiency: The boron deficiency in maize is characterized by underdeveloped roots, short stigma, thinning of inter-pulmonary tissue in the upper leaves, white-transparent streaks, thin leaves, whitish, and even dead; growth points are inhibited, tassels are not pumped When it comes out, the male flower is significantly degraded and becomes smaller, resulting in atrophy, the ear is degenerate, and the top grain is empty. Control measures: Borax or boric acid can be applied by means of application, spraying or the like. It is advisable to apply 0.5 kg of borax per mu; the foliar spray concentration is between 0.1% and 0.3%, and the most commonly used concentration is 0.2%.
1. Nitrogen deficiency: When the corn seedlings are deficient in nitrogen, they grow slowly, are short and thin, and the leaves are yellow-green. Nitrogen deficiency during the growth period, the old leaves from the tip of the leaf along the midrib to the base of the blade with yellow, the yellow part is "v" shaped, the leaf edge remains green and slightly curled, and finally burns and died. Control measures: medium-fertility corn fields generally apply 11 kg to 13 kg of pure nitrogen. In summer maize, it is mainly divided into three applications: the first time in the seedling stage, the application rate accounts for 20% of the total amount of nitrogen fertilizer applied to the corn; the second time is applied in the Dagu period, the application rate accounts for 70%; Three times in the flowering period of the male and female, accounting for 10% of the total amount of nitrogen fertilizer applied.
2. Phosphorus deficiency: The main symptoms of phosphorus deficiency are poor root development, slow growth during seedling stage, and symptoms of phosphorus deficiency after the five-leaf stage. The leaves are purple-red, the leaves are purple, the leaves are curled, and the phosphorus deficiency causes filaments. The extraction speed is slow, causing female flowers and male flowers to be infertile, affecting pollination, and the ears are curled, the ears are not aligned, the grains are not full, and the baldness phenomenon often occurs, and the maturity is delayed. Control measures: 5 kg of phosphorus pentoxide in general acre, all in the seedling stage and nitrogen fertilizer together.
3. Potassium deficiency: When the corn is deficient in potassium, the roots are poorly developed, the plants grow slowly, the leaves are light green and have yellow-green stripes. In severe cases, the leaf margins and leaf tips are purple, then the dryness is burning, and the middle part of the leaves is still It can be kept green, but the leaves are gradually wrinkled. The plants are thin, susceptible to disease, easy to fold, poorly developed ears, severe baldness, and low starch content in the grains. Control measures: Generally, the application of potassium oxide is 6 kg to 8 kg, all of which are applied in the seedling stage together with nitrogen fertilizer.
Fourth, zinc deficiency: white zinc seedlings will appear in severe zinc deficiency. The main feature is that in the 3rd to 5th leaf stage of maize, white seedlings begin to appear, and the young leaves of the petals are pale yellow to white, especially at 2/3 of the base of the leaves. In severe cases, the young leaves of the seedlings appear small. White spots, and rapidly expand, forming a local white area or necrotic plaque, necrosis of the mesophyll, translucent leaves, like white silk or plastic film, wind blowing easily. Control measures: The methods of applying zinc to corn mainly include basic application, seed dressing and spraying. The base is mixed with 1 kg to 2 kg of zinc sulphate per acre, and sprinkled into the seeding ditch or cavity before sowing. Each 10 kg of seed dressing is dissolved in 0.5 kg of water with 40 g to 60 g of zinc sulfate, sprayed on the surface of the seed, dried and sown. The concentration of spraying zinc sulphate solution is preferably 0.2%. Generally, it can be sprayed in the first three growth stages of seedling stage, jointing stage and heading stage, and 50 kg to 75 kg of fertilizer solution is used for the mu.
V. Boron deficiency: The boron deficiency in maize is characterized by underdeveloped roots, short stigma, thinning of inter-pulmonary tissue in the upper leaves, white-transparent streaks, thin leaves, whitish, and even dead; growth points are inhibited, tassels are not pumped When it comes out, the male flower is significantly degraded and becomes smaller, resulting in atrophy, the ear is degenerate, and the top grain is empty. Control measures: Borax or boric acid can be applied by means of application, spraying or the like. It is advisable to apply 0.5 kg of borax per mu; the foliar spray concentration is between 0.1% and 0.3%, and the most commonly used concentration is 0.2%.
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