Heavy dry land should not be blindly fertilized

Affected by the El Nino phenomenon and the Arctic Oscillation, the southwestern China has recently witnessed persistent high-temperature and low-rain weather. Among them, the average precipitation in Yunnan Province is 29% lower than the average for many years, and the temperature is 1.7°C higher than in the same period in the past years. Break the highest record. In most areas, the drought is 50 to 60 years. In Yunnan Province, a large area of ​​arable land is commonly used for drought, and droughts of different degrees have occurred in other provinces and regions in the southwest.

How to avoid disadvantages and scientific drought? Experts from the Institute of Agricultural Environment and Sustainable Development of the Chinese Academy of Agricultural Sciences suggest that the spring crops in most parts of Yunnan are about to be grouted and mature, and the great autumn crops will be ready for cultivation. Heavy drought and land harvesting should be prepared in advance for preparation of large autumn crops for soil preparation, and efforts should be made to compensate for losses in Xiaochun.

Implement anti-drought sowing. It is recommended to introduce and rush a batch of corn water-injection seeders to implement drought-resistant sowing. For areas where seeds are lacking, suitable varieties for the growing period can be introduced from the surrounding areas. The terrain in Yunnan is complex and there are large differences in climate. According to the heat conditions, suitable varieties should be selected, and blind introductions should not be made.

Artificial rainfall should catch favorable weather. When the air is very dry, it should not be used to avoid wasting resources. Only when there is cloud can there be rain, but not all clouds have the potential for precipitation, and only those who have the potential for precipitation (cloud water resources are abundant, clouds are thicker, and there are more abundant cold-water areas for cold clouds). Catalyzed rain. In fact, after increasing rainfall by means of artificial rainfall, the drought situation can only be alleviated to a certain extent, and it cannot be eliminated at all. In addition to increasing the amount of rainfall, the complete elimination of drought conditions requires the close cooperation of water conservancy facilities.

Not for the bumper harvest in the drylands. Although the drought has brought serious consequences, there are certain favorable factors in the disadvantages. Drought years usually have favorable light and temperature conditions. At present, the commonly used cultivated land in Yunnan Province accounts for about 70% of the uneatened land. It is necessary to strengthen the management of such fields and increase the investment, so as to strive for unharvest dryland harvest, and the light and dry land is better Harvest, in order to compensate for the heavy drought and land loss.

Heavy dry land should not be blindly fertilized. The optimal allocation of water and fertilizer can exert its effect. Fertilizer application effects in arid soil can be counterproductive. Therefore, the current limited fertilizers should be mainly used in non-drought and light-dry land plots, as well as the preparation of large autumn crops. Heavy-majority plots should not be blindly fertilized.

Use rainwater resources for long-term drought resistance. The seasonal drought in the South is different from the normal drought in the North. It is necessary to make full use of the water resources in the rainy season to compensate for the shortage of the dry season. Therefore, it is necessary to vigorously strengthen the construction of water conservancy facilities in the seasonally arid regions in the south and use the rainy season to store water. In order to build safe and stable sources of drinking water in rural areas, areas with frequent seasonal droughts and severe areas should open up appropriate amounts of groundwater sources and promptly activate them in the event of surface water depletion.

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