The temperature in Zhengzhou has exceeded the historical extreme value of the station, what impact does it have on local agriculture?

The temperature in Zhengzhou broke a new high and set a new record again. According to experts, subtropical high is the main reason that affects summer weather. Compared with previous years, the rainy season in the middle and lower reaches of the Yangtze River will be shorter, and you will go out earlier. Since the beginning of July, the subtropical high has been continuously controlling the middle and lower reaches of the Yangtze River and affected by its southward movement. It is cloudy in sunny days, with strong solar radiation and relatively high atmospheric humidity.

With the increase of temperature, the distribution area of pests may expand, thus affecting the growth of crops. Higher temperature is conducive to the accumulation of land heat, and has a favorable impact on the growth and development of winter crops such as rape in southern China. Climate experts say that climate change will have a great impact on agricultural production in China. If no measures are taken, by the second half of the 20th century, the output of major crops in China, such as wheat, rice and corn, will drop by as much as 37%.

In animal husbandry, the drought trend caused by climate change will increase the potential desertification trend in semi-arid areas, the grassland boundary may expand, the area of alpine grassland will decrease, and the distribution pattern of grassland carrying capacity and carrying capacity will change greatly. The unusually high temperature in summer is the main factor leading to the rapid development and aggravation of drought. Crops suffered from high temperature and drought, which led to poor fruiting and grouting, and the grain yield was reduced by more than 5 million tons. The yield and quality of cash crops have also declined. At the same time, agricultural infrastructure has also been seriously damaged, which has a great negative impact on the sustainable development of agriculture.

Effects of climate change on the use of chemical fertilizers and pesticides. Fertilizer efficiency is very sensitive to the change of environmental temperature, especially nitrogen fertilizer. Every time the temperature rises by 65438 0℃, the amount of available nitrogen that can be directly absorbed and utilized by plants will increase by about 4% and the release period will be shortened by 3.6 days. Therefore, in order to maintain the original fertilizer efficiency, the amount of fertilization will increase by about 4% each time. With the warming of the climate and the extension of the growing period of crops, the generations of insect reproduction will increase in spring, summer and autumn, and the higher temperature in winter is also conducive to the safe overwintering of larvae, and the occurrence range of various pests and diseases will expand, which will aggravate the epidemic of pests and diseases and the spread of weeds, which means that these areas will have to apply a large number of pesticides and herbicides.