How to apply jointing fertilizer for summer corn?

How to apply jointing fertilizer for summer corn? When is the effect of applying jointing fertilizer good? Please give guidance on the jointing of summer corn after 18-21 days of emergence. As a sign of entering the jointing stage, from the external morphology, early-maturing varieties, such as Ludan 50, Yedan 20 and Denghai 9, spread 4 leaves and 10 leaves. The mid-maturing varieties, Yedan 22, Ludan 98 and Nongda 108, etc., had 6 leaves and 12 leaves, late-maturing varieties, Denghai 11, Yedan 11 and Yedan 13, 9 leaves and 13 leaves. This is the best time to apply jointing fertilizer. After maize enters the jointing stage, the stems and leaves grow vigorously, the male ear begins to differentiate, and the demand for nutrients is becoming more and more urgent. Timely application of jointing fertilizer can build a good skeleton for high yield in the later stage. So how much fertilizer should be applied per mu? The experiment shows that it is suitable for the plot with low soil fertility, low base fertilizer, small population, weak seedling growth and a yield of 250kg to 300kg per mu, which accounts for 45% and 50% of the total topdressing amount. Medium fertility plot, good soil fertility, strong seedling growth, high field population uniformity, thick green leaves, and yield per mu of 550-650 kg. In order to avoid excessive growth of seedlings and ensure the steady growth of plants, jointing fertilizer can be controlled at 30%-35% of the total topdressing fertilizer; the rest of the fertilizer can be reserved for panicle application to meet the needs of the rapid increase of nutrients and the continuous differentiation of female and male ears. A high-yielding plot with high soil fertility, sufficient bottom fertilizer, large population, robust seedling growth and yield per mu of 650-750 kg. In order to prevent excessive growth of nutrients, ensure the steady growth of seedlings, maintain the balance of plant energy conversion and material metabolism, and ease the contradiction between population and individual competition for living conditions, topdressing at this stage should not be too much. Jointing fertilizer generally accounts for 20% and 25% of the total topdressing. The remaining fertilizer is reserved for panicle attack and grain attack application, which is beneficial to promoting panicle enlargement, grain weight and high yield. When topdressing, you should open deep ditches and cover the soil strictly, and do not spread it on the ground. The experiment showed that the yield of ditch application of 5CM was 10.36%-12.37% higher than that of direct application on the ground, and that of furrow application of 10CM was 12.58%-16.35% higher than that of ditch application of 5CM. Therefore, it is better to apply deep fertilizer when topdressing, so as to improve fertilizer utilization efficiency and cultivate strong seedlings. Click to get more corn planting techniques click to get more food crop planting techniques