Corn is a kind of crop that needs more fertilizer and more concentrated fertilizer. The base fertilizer and seed fertilizer can not meet the needs of its growth and development. Especially, the summer corn is increased when the base fertilizer is insufficient or the base fertilizer and fertilizer are not applied. Applying top dressing is more important.
The time, frequency and quantity of topdressing should be determined according to the law of corn absorption, the level of yield, the basis of soil fertility, the amount of fertilizer applied, the application of base fertilizer and seed fertilizer. High-yielding fields, good foundations, and a large number of top-dressing fertilizers should be applied with light-seeking seedlings, heavy-chasing ear-fertilizers, and top-dressing fertilizers. The amount of seedlings is about 30% of total nitrogen and 50% of ear fertilizer. Granular fertilizer accounts for about 20%. For the middle-yielding field, the foundation of the soil fertility is better, and the number of top-dressing fertilizers is higher, the secondary topdressing method of applying the seedling fertilizer and the heavy-seeking fertilizer should be adopted. The seedling fertilizer accounts for about 40%, and the ear fertilizer accounts for about 60%. Low-yielding fields, poor foundations and low topdressing weights have a good effect on heavy-seeking seedlings and light-seeking fertilizers, with 60% of seedlings and 40% of ear-fertilizers.
Miao fertilizer is generally applied after the seedling is fixed to the jointing stage (about 30% of the leaf age index). The imminently introduced seedling fertilizer and jointing fertilizer are combined for one application, which has the functions of promoting roots, strong seedlings and promoting leaves and strong stalks, laying a good foundation for the ear and the ear. In addition to the application of quick-acting nitrogen fertilizer, the seedling fertilizer can also be applied with phosphate fertilizer and potassium fertilizer at the same time, and can also be applied with decomposed organic fertilizer.
Spike fertilizer refers to the top dressing used before the extraction from the jointing stage of the corn to the tassel. The period of maximum fertilization effect is from the spikelet differentiation stage to the filament elongation stage (leaf age index 53%~77%). For example, a mid-late maturity hybrid with a total number of leaves of 20 should be topdressed when 11 to 15 leaves are unfolded, that is, it is best to apply the ear fertilizer at the center of the big bell mouth (about 60% of the leaf age index). At this time, it is in the stage of spikelet and florets differentiation, and the vegetative body grows rapidly. The male and female ears are vigorously divided, requiring the most fertilizer and water, which is the key period for determining the size of the ear and the number of grains. At this time, the fertilizer and water attack can not only meet the needs of spike differentiation for fertilizer and water, but also improve the photosynthetic productivity of the middle and upper leaves, and transport nutrients to the ears to promote the large and large grains.
Granulated fertilizer refers to the fertilizer applied after corn tassels are generally applied in the filling stage. After the corn is taken from the male to the mature stage, about 40% of the total nitrogen and phosphorus nutrients are absorbed from the soil. At the same time, about 80% of the grain yield is based on the later leaves to produce photosynthetic yield. Therefore, in the later stage, a certain amount of quick-acting fertilizer should be applied to ensure the sufficient supply of inorganic nutrients, extend the functional period of the leaves, increase the photosynthetic efficiency, increase the accumulation of photosynthetic products, and promote the grain and grain weight to obtain high yield.
Author: Di Guanghua Zhang Meiqin Source: rural Henan Daily Edition
The time, frequency and quantity of topdressing should be determined according to the law of corn absorption, the level of yield, the basis of soil fertility, the amount of fertilizer applied, the application of base fertilizer and seed fertilizer. High-yielding fields, good foundations, and a large number of top-dressing fertilizers should be applied with light-seeking seedlings, heavy-chasing ear-fertilizers, and top-dressing fertilizers. The amount of seedlings is about 30% of total nitrogen and 50% of ear fertilizer. Granular fertilizer accounts for about 20%. For the middle-yielding field, the foundation of the soil fertility is better, and the number of top-dressing fertilizers is higher, the secondary topdressing method of applying the seedling fertilizer and the heavy-seeking fertilizer should be adopted. The seedling fertilizer accounts for about 40%, and the ear fertilizer accounts for about 60%. Low-yielding fields, poor foundations and low topdressing weights have a good effect on heavy-seeking seedlings and light-seeking fertilizers, with 60% of seedlings and 40% of ear-fertilizers.
Miao fertilizer is generally applied after the seedling is fixed to the jointing stage (about 30% of the leaf age index). The imminently introduced seedling fertilizer and jointing fertilizer are combined for one application, which has the functions of promoting roots, strong seedlings and promoting leaves and strong stalks, laying a good foundation for the ear and the ear. In addition to the application of quick-acting nitrogen fertilizer, the seedling fertilizer can also be applied with phosphate fertilizer and potassium fertilizer at the same time, and can also be applied with decomposed organic fertilizer.
Spike fertilizer refers to the top dressing used before the extraction from the jointing stage of the corn to the tassel. The period of maximum fertilization effect is from the spikelet differentiation stage to the filament elongation stage (leaf age index 53%~77%). For example, a mid-late maturity hybrid with a total number of leaves of 20 should be topdressed when 11 to 15 leaves are unfolded, that is, it is best to apply the ear fertilizer at the center of the big bell mouth (about 60% of the leaf age index). At this time, it is in the stage of spikelet and florets differentiation, and the vegetative body grows rapidly. The male and female ears are vigorously divided, requiring the most fertilizer and water, which is the key period for determining the size of the ear and the number of grains. At this time, the fertilizer and water attack can not only meet the needs of spike differentiation for fertilizer and water, but also improve the photosynthetic productivity of the middle and upper leaves, and transport nutrients to the ears to promote the large and large grains.
Granulated fertilizer refers to the fertilizer applied after corn tassels are generally applied in the filling stage. After the corn is taken from the male to the mature stage, about 40% of the total nitrogen and phosphorus nutrients are absorbed from the soil. At the same time, about 80% of the grain yield is based on the later leaves to produce photosynthetic yield. Therefore, in the later stage, a certain amount of quick-acting fertilizer should be applied to ensure the sufficient supply of inorganic nutrients, extend the functional period of the leaves, increase the photosynthetic efficiency, increase the accumulation of photosynthetic products, and promote the grain and grain weight to obtain high yield.
Author: Di Guanghua Zhang Meiqin Source: rural Henan Daily Edition
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