Controlling time is generally 6~13 leaves for corn, and 8~13 leaves for leafing. Before the 6-leaf stage of corn, the leaves of the corn were slender and smooth. When the corn expands at the 7-leaf stage, it will become thick and thick, and small white fur will appear on the leaves. This can be felt with the back of the hand. At this time, it is the best time for the promotion of the Kaowang No. 3 to control the production and increase production. Increase income.
The absorption of mineral nutrients at the heading stage is the most, and the absorption intensity is the highest. It is the period when corn absorbs nutrients the fastest, and it is also the most important fertilization period in a lifetime. The application of topdressing nitrogen fertilizer at the big bellmouth stage can effectively promote the differentiation of female florets, and achieve large spikes and grains. Generally, 20~25 kg of urea or nitrogen and potassium compound fertilizer can be topdressed per acre. Top dressing can be done on the side of the ditch or open a deep hole on the side of the plant. It is best to use irrigation or apply it during effective rainfall. Do not spread on the surface of the soil to prevent loss of fertilizer. Spraying strong shuangling can activate plant ecology. Positive energy growth, broadening the path of plant conduits, enhance plant water uptake, increase production and quality.
The diseases and insect pests in summer corn ear should focus on the control of brown spot and corn borer. Timely use of targeted agents + new high fat film spray for prevention and treatment.
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