The main disastrous weather that harms Guangdong's agricultural production in autumn is

The main disastrous weather that harms Guangdong's agricultural production in autumn is cold dew wind.

Cold dew wind is a kind of weather that appears in southern China around the solar terms. The invasion of cold air in autumn will cause obvious cooling and reduce rice yield. Often occurs in the "cold dew" solar terms, hence the name "cold dew wind" (also known as "social wind"). Cold dew wind is one of the main meteorological disasters in the growth period of late rice in South China. Every autumn around the "cold dew" solar term is the key period for heading and flowering of late rice in South China. At this time, if it is damaged by low temperature, it will cause empty shells and shriveled grains, resulting in reduced production.

Before and after the cold dew solar term, late rice is heading and flowering. The cold dew wind during this period will affect the flowering and pollination of late rice, which will easily lead to poor pollination, increase the empty shrinkage rate, reduce the seed setting rate and reduce production.

Preventive measures of cold dew wind

1. Grasp the occurrence law of cold dew wind and the safe heading stage of double-season late rice (referring to the date when more than 80% of the years during heading and flowering of double-season late rice are not harmed by cold dew wind), and rationally mix varieties. That is, according to the appearance of cold dew wind in the morning and evening, select varieties and arrange suitable sowing dates to make them heading safely and avoid the harm of cold dew wind.

2, scientific use of cold dew wind forecast, reasonable arrangement of production. The long-term forecast of cold dew wind can provide reference for leaders and farmers at all levels to arrange double-cropping late rice production. For example, in the year of cold dew and early wind, a variety of early-maturing varieties can be used, and even the planting area of double-cropping late rice can be appropriately reduced; There are many late-maturing varieties, which can be planted late.

3. Cultivate varieties with low temperature tolerance and high yield.

4. Strengthen field management, apply fertilizer rationally, use water scientifically, enhance root activity and assimilation ability of leaves, make plants grow healthily and improve low temperature resistance.