Water and fertilizer management measures in the middle and late stages of maize

Applying the 7-leaf stage of the whole-leaf-leafed corn, it is the optimum period for applying the jointed fertilizer. At this time, the corn leaves are fully expanded, and the stalks are rapidly elongated, requiring a large amount of fertilizer, generally to the full-leaf leaves. 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 the 7~9 leaf stage, and the appropriate application of the seedlings and the late application, less application, the early application and re-application of the thin and thin seedlings, generally 15~20 kg of ammonium per acre, human and livestock Manure is 500~750 kg.

The booting stage of the full-water booting stage is the period of most water demand. Generally, the water requirement for plant growth at the booting stage of corn is about 27%~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 in the visible leaves of 15~16 pieces or the unfolded leaves 8~10 pieces; the middle and late-maturing varieties are suitable for 15~17 pieces of visible leaves or 11~12 pieces of unfolded 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 or if 7.5~10 kg of urea is used.

(Xue Yuhua, Agricultural Science and Technology Station, Longmu Town, Da'an City, Jilin Province)

Farmers Daily

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