Editor's note: When the time is in the fall, the temperature is difficult to "fire line". The high temperature in many places in China continues. How can we not forget the infringement of crops when the heat wave strikes people? We are familiar with the fact that corn is resistant to heat, but this volatility also makes corn unbearable. At present, it is the loosening period of corn plucking, which is affected by high temperature and heat damage, and pollination of corn is unfavorable, resulting in difficulty in quality and yield. How to ease the status quo, please take a look at the following doorways.

High temperature is not good for pollination corn

In the flowering period, when the temperature is high, the corn powder is adversely affected. There are test data showing that when the temperature is higher than 32 °C, it is not conducive to corn pollination, which will lead to the decrease of corn pollen vigor or pollen death, difficulty in silking, or loss of fertilization ability of filament, and can not complete the pollination and fruiting process, and the male and female ears are not coordinated. The seed setting rate is reduced, and the formation of the ear is bald and deflated, not to mention the recent high temperature of 38 °C?

Throughout the many varieties, the varieties with more tassels are more resistant to high temperatures and firmer, and Zhengdan 538 and Dedan No. 5 have shown strong heat resistance, and the fruiting condition is better; 335, Denghai 605 and other varieties of flowering period heat tolerance is weak, this year's heat damage is more serious.

Comprehensive prevention and loss reduction

Under normal circumstances, the fertilization ability of corn silk can generally be maintained for about 7 days, and the fertilization ability is the strongest after 2 to 5 days after spinning. After 7 to 9 days of spinning, the style of the flower deteriorated, and 11 days almost lost fertilization ability. The filaments stop extending after fertilization and become brown and wither after 2 to 3 days. When the corn is heading and flowering, it will cause severe drought or high temperature, which will not only lead to less flowering and loosening of the tassel, but also delay the silking of the ear, which will make the flowering period meet badly, resulting in low pollination fertilization rate.

Summer corn is in the period of tasseling and silking, which is the most sensitive period to high temperature. In order to alleviate the current high temperature damage to summer corn, conditions such as irrigation and cooling, artificial aided pollination, foliar spray fertilizer and other measures can be taken. Irrigation can improve the microclimate in the field, reduce the temperature between plants by 1 °C ~ 2 °C, increase the relative humidity, and effectively reduce the high temperature hazard. Artificial assisted pollination can increase the amount of pollen falling on the stigma and increase the seed setting rate. Spraying with urea, potassium dihydrogen phosphate or other high-quality foliar fertilizers to increase the water content of the panicles of the plants, which can cool down and humidify, promote loose powder, and provide water and nutrients to the leaves, but pay attention to the concentration of fertilizer. Big.

In addition, rationally pursue the attacking fertilizer to increase the 1000-grain weight; cut off the seriously damaged plants to improve the microclimate in the field, reduce the occurrence of pests and diseases, do everything possible to increase the productivity of individual plants and reduce the loss of yield.

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