How to fertilize corn in summer?

How to fertilize corn in summer? Please guide summer corn fertilization should grasp "base fertilizer, topdressing as a supplement; base fertilizer in organic fertilizer, chemical fertilizer as a supplement, phosphorus and potassium fertilizer mainly as base fertilizer, topdressing by stages; sufficient base fertilizer, early application of seedling fertilizer, pay attention to budding fertilizer." Wait for the principle. It is appropriate for N:P:K to be 0.5 / 0.8 / 0.5 / 0.8 in 1. General base fertilizer water dung 1500Kg, urea 5Kg, superphosphate 20Kg per mu. Base fertilizer can be spread and ploughed into the soil, or most of the spread and a small part of the concentrated application, or all ditch or hole application. Fertilizer planting and foliar spraying are rarely used. Topdressing is divided into seedling fertilizer, jointing fertilizer, panicle fertilizer and grain fertilizer. After fixing the seedling, we should pay close attention to the organic fertilizer, and apply the seedling fertilizer at the 4 ~ 5 leaf stage, generally using water manure 1500~2000Kg and urea 10Kg per mu; in the soil where phosphate fertilizer and potassium application are effective, we can apply a part of phosphorus and potassium fertilizer appropriately. Under the condition of normal growth at seedling stage, panicle fertilizer was re-applied, and panicle fertilizer was concentrated at one time in the case of insufficient chemical fertilizer. The effect of grain fertilizer topdressing at heading time on yield increase was significant. After the maize blossoms, phosphate fertilizer can be sprayed outside the root, generally with 0.4% 0.5% potassium dihydrogen phosphate solution or 30.4% calcium superphosphate clarification leaching solution, about 75~100Kg per mu, sprayed on the stems and leaves, the effect is remarkable. Click to get more corn planting techniques click to get more food crop planting techniques