Reasonable topdressing and promoting big ears

From the jointing and booting stage to the heading and flowering stage, the maize plant has a fast growth rate and a large amount of nutrients absorbed. It is a key period for the absorption of fertilizer. After flowering and pollination, more nutrients are absorbed, but the absorption rate is slowed down. As far as corn is concerned, nitrogen uptake at seedling stage accounts for 9.7% of the total, and in the medium term, it accounts for 78.4%, and in the later stage, it accounts for 11.9%. Therefore, high yield of summer corn must be done in the late stage of fertilization, early emergence of spikes, promotion of large ears, and high yield.
Applying the 7-leaf stage of the whole-leaf-leaf-fertilized summer maize is the optimum period for applying the jointed fertilizer. At this time, the corn leaves are unfolded in a large amount, and the stalks are rapidly elongated, requiring a large amount of fertilizer, generally to the full exhibition. At the 9-leaf stage, soil nutrients are difficult to meet the needs of corn growth. At this time, the corn should be grasped before and after the jointing of 7~9 leaf stage, and the late application and low application of the seedlings and the weak, early application and re-application of the thin and weak seedlings, generally 15-20 kg of ammonium per acre, human and livestock Manure is 500-750 kg.
The booting stage of the water is the period of most water demand. Generally, the water requirement for plant growth at the booting stage of corn is about 27% to 38% of the total water requirement during the whole growth period. The soil moisture in this period should be kept at 70% of the field water holding capacity. 75%, with water and fertilizer, to meet the needs of fertilizer growth and development of corn.
Re-application of panicle fertilizer and panicle fertilizer can not only improve the photosynthesis efficiency, but also promote the growth of the panicle leaves and the upper and lower leaves, and can extend the life of the leaves and promote the fullness of the seeds. The application time of panicle fertilizer is related to corn variety and soil fertility. Generally speaking, the early maturing varieties are 15 to 16 pieces of visible leaves or 8 to 10 pieces of leaves; the mid-late varieties are suitable for 15 to 17 pieces of visible leaves or 11 to 12 pieces of leaves, and the base fertilizer is sufficient and the growth is strong. For plots, it is advisable to apply panicle fertilizer slowly. It is advisable to start planting a small number of plants in the whole field; the growth potential of lean soil with insufficient base fertilizer is poor, and the ear fertilizer should be applied early. Spike fertilizer should use quick-acting nitrogen fertilizer. Generally, 25-35 kg of ammonium bicarbonate is applied per acre of acupoints. If urea is used, 7.5-10 kg per acre can be applied.

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