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Miao Miao Miao Fertilizer is a fertilizer that is applied after the corn is seedling. Miao Miao should be applied early (3 to 4 leaves when planting), partial application (small seedlings, weak seedlings and more). After the 3 leaves of the maize are unfolded, the nutrients in the seed endosperm have been depleted, and the roots begin to absorb nutrients from the soil. At this time, the vegetative organs of the corn have grown vigorously. If the soil lacks nutrients, it will seriously affect the growth and development of the corn. , timely top dressing is conducive to the formation of strong seedlings, lay the foundation for high yield. The application rate of seedling fertilizer may account for about 40% of the total fertilizer application. If sowing with seed fertilizer can be appropriately reduced the amount of fertilizer and postponed fertilization time. Generally, 500 to 750 kilograms of organic fertilizer is applied to each mu, urea is 3 to 4 kilograms, or ammonium bicarbonate is 7.5 to 10 kilograms. Maize is sensitive to zinc. If zinc deficiency has a great influence on the yield, it is appropriate to apply 1–1.5 kg of zinc sulfate per acre to the combined use of seedling fertilizer for zinc-deficient fields.
The jointing-section fertilizer not only satisfies the need for massive growth of roots, stems, and leaves, but also ensures the supply of nutrients for the development of the genital organs, so that the vegetative growth and the reproductive growth can be coordinated. Therefore, the jointing fertilizer is usually applied before and after the jointing of the corn 7-9 leaves. , Open the hole and chase. Fertilizers are suitable for late application, less application, and early application and re-application of thin and thin seedlings, applying 15-20 kg of ammonium per acre, and 600-750 kg of livestock and manure. It is conducive to the development of robust roots, plentiful stalks and ears, large grains and large grains, and prevention of empty stalks and lodging.
Attacking manure fertilizer When corn has a big bell, it is a period of vigorous development of male and female flower organs in the corn. It is a crucial period for determining the size of the ear and grains and the viability of pollen. If the lack of fertilizer often leads to baldness and pods, the yield is serious. Decline, so attacking fat can not be ignored. Generally, 500-600 kilograms of livestock and manure are used per acre, and urea 7.5-10 kilograms are applied. After the hole is applied, soil is covered, or 45% compound fertilizer 35-40 kilograms is more effective. The specific fertilization time is 10 to 15 days before the corn tasseling. When the hand can touch the tassel, the weak seedling can be appropriately advanced, and the seedling can be later, and the panicle fertilizer generally accounts for about 40% of the fertilization amount.
Supplementary application of granular fertilizer should be based on the growth of corn. The lack of attacking manure fertilizer and yellow leaves below the ear section will cause grain fertilizer to occur when defertilization occurs. On the contrary, it will not be able to grow. Granule fertilizer is generally applied when corn ear is spun, with 2~3 kg of urea per acre, pouring water into the plant. It is also possible to use 25-30 kg of ammonium bicarbonate per acre when fertilized after pollination by maize silk to promote grain filling and increase grain weight. Granules generally account for about 20% of the amount of fertilizer.
Clever use of foliar fertilizer spraying 0.2%~0.3% of potassium dihydrogen phosphate 2~3 times in corn jointing stage can increase corn production by about 10%, spraying 0.1%~0.3% of zinc sulfate during seedling stage and jointing stage. Aqueous solution can prevent corn white mosaic disease.
Summer corn topdressing nitrogen fertilizer application depth of about 10 cm is appropriate, cover soil after application to prevent volatilization, Miaofei from the plant 10 to 12 cm, panicle fertilizer, grain fertilizer from the plant 15 to 20 cm.
High-yield top-dressing of summer corn is the key
Most of the summer corn use no-tillage method, the general application of base fertilizer is not much, interplanting summer corn, seed fertilizer is also rarely used. Therefore, the nutrients needed for the growth and development of summer corn are mainly met by topdressing, so topdressing plays a key role in the high yield of summer maize. When top dressing, it should focus on fertilization in the following periods to achieve high quality and high yield of corn and improve the economy. benefit.