Four determination of fertilization for High yield of Spring Maize

In recent years, due to the lack of organic fertilizer input and people's demand for increasing per unit yield, the amount of fertilizer applied to corn has increased significantly, and the application area of some high concentration compound fertilizers has also been expanded, which has effectively promoted the increase of yield. however, fertilizer damage at seedling stage, element deficiency or late de-fertilization and yield reduction often occur, so farmers urgently need to know the essentials of rational fertilization for spring corn. The following four decisions should be made in the fertilization of spring corn: first, to determine the appropriate proportion, we should determine a reasonable proportion of nitrogen, phosphorus and potassium fertilizer, and strive to balance fertilization. The ratio of absorbing nitrogen, phosphorus and potassium is about 10015. Combined with the characteristics of high utilization rate of nitrogen and potassium and low utilization rate of phosphorus, we should focus on nitrogen, phosphorus and potassium in fertilization, and the suitable proportion of nitrogen, phosphorus and potassium is about 100-60-40, and strive to implement formula fertilization. Second, to determine the amount of fertilizer for high yield, a reasonable amount of fertilizer should be determined, fertilizer should be determined by yield and fertilizer should be determined by soil fertility. 1 kg of nitrogen, phosphorus and potassium can increase the yield of grain by 810 kg. Generally, for every 100 kg of grain produced, the production capacity of the soil is calculated according to 60%, which requires 3.43 kg of pure nitrogen, 1.23 kg of phosphorus and 2.36 kg of potassium. Third, to determine the number of scientific fertilization and strive to be effective and reasonable in each fertilizer supply, and to achieve the combined application of base fertilizer, planting fertilizer and topdressing fertilizer. In general, based on the application of 1000-1500 kg organic fertilizer, 15 N-15 P-15 K (general type), 20 N-15 P-5 K (middle or more fertile land) or 16 N-12 P ~ 12 K (low yield or barren land) can be selected. Urea 20-25 kg at the trumpet stage and 10-15 kg at the panicle stage. 4. To determine the efficient fertilization method, a reasonable fertilization method should be adopted, and the application of base fertilizer should be the combination of organic fertilizer and chemical fertilizer, and the fertilization method can be spread before cultivated land or by machine; seed fertilizer should be strictly separated from seeds or strictly limited to diammonium phosphate, and the application amount per mu is less than 5 kg, which can be mixed with corn seeds. Topdressing should be in the jointing-booting stage, that is, the small trumpet mouth-big trumpet mouth stage, 10-15 cm from the base of the stem, 10-15 cm deep on the mechanical side, or human, Chuli trench application, hole application and timely covering soil.