Field Management techniques of planting Summer Maize
Most of summer maize has entered the jointing stage-big trumpet stage, so it is very important to grasp the chemical control of lodging at jointing stage, the application of ear fertilizer and the prevention and control of diseases and insect pests.
1. Scientific chemical control. Due to the postponement of the growth period of wheat, the sowing date of corn is generally late, and the jointing period coincides with the rainy season, which lays a hidden danger for the lodging of corn. Chemical control can not only enhance the toughness of maize stalk, developed root system and lodging resistance, but also deepen leaf color, thicken leaves, increase chlorophyll content, enhance photosynthesis, generally reduce plant height by 10-15 cm and ear position by 10-12 cm. It can also shorten the internodes and shape an ideal high-yield plant shape with good ventilation and light transmission. It has the effect of drought resistance, disease resistance, lodging resistance, promoting reproductive growth, large corn cob, many kernels, low grain weight and bald tip rate. Increase the density by 200-400 plants per mu, and generally increase the yield by 15% MUR 30%, which can really achieve "close planting for high yield". Generally speaking, the time of chemical control is 6-13 leaves of maize, especially 8-13 leaves, the effect is the best. Before the 6-leaf stage of corn, the leaves of maize are slender and smooth. When the corn unfolds the seven-leaf stage, it becomes broad and thick, and tiny white hairs appear on the leaves, which can be easily felt on the back of the hands, which is the best time to spray chemical control agents. Spraying chemicals is the first choice for the Di Agricultural Insurance, the latest scientific research achievement of the Chinese Academy of Agricultural Sciences.
2. Topdressing panicle fertilizer. The ear stage absorbs the largest amount and intensity of mineral nutrients, which is the fastest period for corn to absorb nutrients, and it is also the most important fertilization period in its life. Topdressing nitrogen fertilizer at the big trumpet mouth stage can effectively promote the differentiation of female spikelets and achieve large panicles and more grains. Generally, urea or nitrogen and potassium compound fertilizer can be applied to 20kg / mu. Topdressing can be ditched on the side of the row or deep application on one side of the plant, preferably combined with irrigation or during effective rainfall, do not sprinkle on the soil surface to prevent fertilizer loss.
3. Strengthen the prevention and control of diseases and insect pests. The diseases and insect pests of summer corn at ear stage should focus on the control of brown spot and corn borer. Brown spot can be controlled by 12.5% Heguoli or 12.5% trimethrin foliar spray; corn borer can be perfused with phoxim granules or 4.5% cypermethrin emulsion or 50% phoxim EC heart leaf spray.
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How to prevent the damage of Maize herbicides
In order to prevent herbicides from causing drug damage, we must strictly follow the use technology and standardize the operation. First, according to the corn crop and the control object, select the herbicide, according to the description on the label, find out the name, dosage form, active ingredient content and usage. In
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Key points of Management techniques for ear stage of planting Maize
The ear stage of maize refers to the period from jointing to heading, which is the stage of both vegetative growth and reproductive growth. In this period, there is not only the vigorous growth of roots, stems and leaves, but also the differentiation and development of female and male ears, which is the fastest growth and the largest growth in the whole life of maize.
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