Summer corn field tube three-step walk
The time of scientific control and control is generally 6~13 for corn, and the best for 8~13 leaves. Before the 6-leaf stage of corn, the leaves of the corn were slender and the leaves were smooth. When the corn is unfolded at the 7-leaf stage, it will become thick and thick, and fine white fur will appear on the leaf surface, which can be felt by the back of the hand. This is the best time to spray the chemical control agent. Spraying the drug is the first choice for the latest research results of the Chinese Academy of Agricultural Sciences.
The application of panicle and fertilizer to the ear nutrient has the highest absorption of mineral nutrients and the highest absorption intensity. It is the fastest period for corn to absorb nutrients and the most important fertilization period in life. The application of nitrogen fertilizer during the big bell period can effectively promote the differentiation of the florets of the ears and achieve more spikes and larger grains. Generally, 20 to 25 kg of urea or nitrogen-potassium compound fertilizer can be applied per acre. The topdressing method can be ditched on the row side or deep in the side of the plant. It is best to combine it with irrigation or during effective rainfall. It should not be applied on the surface of the soil to prevent fertilizer loss.
Strengthening pest control The pests and diseases in the summer maize ear stage should focus on the prevention and control of brown spot and corn borer. Brown spot disease can be controlled by 12.5% ​​straw or 12.5% ​​rusting foliar spray; corn mash can be filled with phoxim granules at the big bell stage or with 4.5% beta-cypermethrin emulsion or 50% phoxim emulsifiable concentrate Heart leaf spray is used for prevention and treatment.
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