1. Base fertilizer ? Dosage: generally accounts for 50-60% of the total fertilization amount ; application of organic fertilizer 1000~2000 kg / mu ( and is suitable for application after 20 kg of phosphate fertilizer ) . Basal huaqiang content per acre or 40 zhenzhuquan fertilizer 30-40 kg, low soil fertility or sowing in early spring the plots should be chosen higher phosphorus content in the formulation. Spring, summer and autumn corn are different: summer and autumn corn planting is high in the pre-growth condition, and the fertilizer is decomposed quickly. If the base fertilizer is applied too much, the seedling period is easy to grow, and the nutrients are easy to be lost. Therefore, the base fertilizer should be applied less properly.
    2 , Miao Fei ?  When the amount of base fertilizer is insufficient or when quick-acting nitrogen fertilizer is used, the seedling fertilizer should be applied as soon as possible. If the base fertilizer is sufficient or the soil conditions are good and the seedlings grow robustly, the seedlings may not be applied. ? Dosage: Depending on the field seedlings and the amount of base fertilizer, it generally accounts for 20-30% of the total topdressing amount . ?
    3 , panicle fertilizer - is the most important topdressing of corn high-yield cultivation ? Effect - panicle fertilization is the fertilization of the panicle differentiation during the spikelet and floret differentiation period, which can promote the differentiation of spikelets and florets, and obtain spikes and grains. many. At this time, it is also the stage of corn vegetative growth and reproductive growth, which requires nutrients and water, and is also a critical period for determining the number of grains per ear. Therefore, panicle fertilizer is very important, and it is necessary to grasp the appropriate timing to apply panicle fertilizer, and the effect of increasing yield can be significant. Generally accounted for 60-70% of the total topdressing amount ; application period: generally mid-late maturity varieties should be applied about 10-12 days before heading , that is, in the corn big bell mouth period, when the ear enters the floret differentiation stage, the tassel Enter the period of tetrad differentiation. The panicle fertilizer is applied with 15 to 20 kg of urea in the corn flare (corn 11 to 13 leaves) . Spike fertilizer should also be applied according to the condition of the seedlings and the type of fertilizer, as appropriate: the general seedlings are poor, the base fertilizer is insufficient, and the late-effect fertilizer should be applied early and often.
4 , granular fertilizer ? Granular fertilizer is the application of corn in the case of insufficient panicle fertilizer. In high-yield cultivation, spring corn can be used as a grain-fertilizer. When summer corn is obviously lack of fertilizer in the later stage, it can be applied to grain fertilizer. Dosage: Depending on the amount of seedlings in the field and the amount of panicle fertilizer, it usually accounts for 15-20% of the total topdressing amount . Â ?
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