How to fertilize spring maize in Northeast China

According to the characteristics of soil fertilization and the fertilizer requirement of corn, the amount of fertilizer was determined, and the operation of nitrogen was used to control the phosphorus, potassium and medium and trace elements.

( 1 ) Base fertilizer. Under normal circumstances, 1/4-1/3 of total nitrogen in the corn and phosphorus and potassium fertilizers are all used as base fertilizer. Spring corn is applied with 2-3 tons of organic fertilizer per mu as base fertilizer. Medium and trace element fertilizers should be supplemented according to soil nutrient conditions.

( 2 ) Fertilizer. Do not use too much. Fertilizers should not be in direct contact with the seeds to avoid burning.

( 3 ) Topdressing. For plots with thinner ground forces, the amount of topdressing should be increased, and vice versa. For hi-fertilizer varieties, such as Si Mi 25 , Tongji 100, etc., the amount of topdressing should be increased to give full play to the potential for increasing yield of varieties; for varieties with high tolerance, such as Si Mi 21 and Jidan 180 , the amount of topdressing should be appropriately reduced. The amount of early-maturing varieties is less than that of late-maturing varieties. The varieties with high tolerance should increase the amount of topdressing, such as Zhengdan 958 , Xianyu 335, etc.; large ridge double-row or protective tillage should increase the level of fertilization. Spring corn topdressing should be applied in three times in the light, medium and heavy, and then supplemented . The first application before and after jointing, accounting for 30%-40% of the total nitrogen topdressing ; the second time in the big bell mouth period, accounting for 40%-50% of the total nitrogen topdressing , the third in the flowering pollination period , accounting for 10%-20% of the total amount of topdressing . In addition, the sandy soil should be applied in small amount multiple times; when it is dry, try to topdress before the rain; it should be topdressed with the growth of the field and the seedlings; in the late-maturing land, the phosphorus and potassium fertilizer should be added; Apply less nitrogen fertilizer and apply appropriate amount of phosphorus and potassium fertilizer.

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November 25, 2022