Five points of fertilization in summer corn

　　 Most of the summer maize is mainly live after wheat, with no land preparation, no bottom fertilizer, fast growth and short growth period. Therefore, early preparation for grabbing time and stealing, rational fertilization is the key to capturing high yield and good harvest of summer corn.

    Grasp the favorable timing of fertilization: the jointing of the summer corn begins 25 days after sowing , and the ear differentiation begins. After 40 to 50 days after sowing, it enters the stage of florescence differentiation of the ear, and requires the most water and is the key period for determining the yield. As a result, about 45 days after sowing summer corn fertilizer is a favorable opportunity.

    According to water and fertilizer conditions, fertilizer varieties should be applied: irrigated land can be used for 40 to 45 days after dressing, and dry land can be used for 30 to 40 days after dressing, depending on the situation. Available nitrogen, ammonium bicarbonate, ammonium nitrate can be applied to recover schedule, urea, 3 to 4 days in advance was applied.

    Fractional fertilization and “one shelling” high-yield irrigated land can be divided into two fertilizations. 20 to 25 days after sowing was applied from 30% to 40% of the total fertilizer, 40 to 50 days after sowing was applied 60% to 70% of the total fertilizer. Dry land can be applied once in 30 to 45 days after sowing .

    Suitable fertilizer level and proportion: 400 to 500 kilograms per mu can be irrigated urea 20 kg, 40 kg superphosphate, potassium chloride 6-8 kg, 1 to 2 kg of zinc sulfate; yield ~ 300 350 kg of land can be applied with 15 to 20 kg of urea per acre , 30 kg of superphosphate , 5 to 6 kg of potassium chloride and 1 to 2 kg of zinc sulfate .

    Fertilizer deep application and fertilizer and water cooperation: According to the national soil and fat test network test, urea application, nitrogen fertilizer utilization rate is only about 55% of the buried , that is, the application of urea fertilizer effect will lose about 50% . Thus, regardless of urea, ammonium carbon, ammonium nitrate, fertilizer should be applied to the buried, the depth of buried facilities 8 to 15 cm. It is not advisable to water the urea immediately after application, and the watering effect is better after 3 to 4 days after application .