Scientific control of chemical and chemical development time is generally suitable for 6~13 leaves of maize, and the best effect is for 8~13 leaves. Before the 6-leaf stage of corn, the leaves of the corn were slender and smooth. When the corn spreads out in 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. This is the best time to spray chemical control agents. Spraying pesticides is the preferred scientific research achievement of the Chinese Academy of Agricultural Sciences.
The head and ear heading stage has the most absorption of mineral nutrients and the highest absorption intensity. It is the period in which corn absorbs nutrients the fastest, and 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.
Strengthen pests and diseases Prevention and treatment of diseases and insect pests at the ear stage of summer maize should focus on the control of brown spot and corn borer. Brown spot can be treated with 12.5% ​​wolfberry fruit leaf or 12.5% ​​trifenin foliar spray; corn glutinous rice can be brewed with phoxim granules in large bell mouth or with 4.5% beta cypermethrin emulsion or 50% phoximidine cream Heart leaf spray for prevention and treatment.
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