Crop heat damage prevention measures
High-temperature heat damage is the damage caused by high temperature on plant growth and yield formation. Defensive measures against high temperature and heat damage should start from the aspects of reforming the farming system and adjusting the planting period. However, we must also pay attention to ways to improve the microclimate in the fields such as irrigation and shading. Fruit trees to prevent heat damage measures to pay attention to orchard maintenance, orchard irrigation, tree trunk coating and sprinkling agents. To prevent tree burns, care should be taken to mix and match negative and positive tree species, create multiple layers of forests, and select favorable terrain and soil during afforestation. 1. Rice Prevention Techniques: First of all, it is necessary to master the management of water layer in the flowering filling stage, and the groundwater should be filled with shallow water during flowering, and the night row should be filled at the right time to dry at a proper time to prevent water shortage and drought and improve the microclimate in the field so as to facilitate grouting. full. In addition, the selection of high-temperature resistant varieties, spraying 3% of superphosphate at the high temperature, all have the effect of reducing high temperature damage. 2, vegetable prevention techniques: spring sowing high temperature fruit and vegetables (such as tomatoes, peppers) to avoid sowing too late, and to strengthen the former Sri Lankan management, promote lush foliage, to reduce the sun, Miao Zhuang can also increase the resistance to high temperature. Plant more heat-resistant fruits and vegetables, such as melon, loofah, kidney beans, and other vegetables. In the high-cold mountainous areas in the sea, we will build a summer low season vegetable supply base. Interplanting high-stalk crops to use shade to cool, such as between eggplant and sweet pepper, both have the effect of shading and cooling. Watering in a timely manner, because sudden cooling will cause physiological obstacles to the growth of vegetables. Covered cultivation. After the summer, shade nets (cool yarns) cover the cultivation to prevent direct solar radiation from burning the vegetables. The temperature of the topsoil can be reduced by 3-5 degrees compared with the open cultivation, thus protecting the vegetables and vegetables from the summer. Growth regulators were applied to control flowering. Such as using 2.4-D dip flower can prevent tomatoes and eggplant due to high temperature falling, and promote ovary enlargement. Spraying of PCPA (p-oxy- phenoxyacetic acid) solution also prevents eggplant falling. 3, fruit tree prevention technology: mainly to prevent sunburn of fruit trees. The main defense measures include: Orchard irrigation and orchard conservation measures in the summer to increase the water supply of fruit trees to meet the water needed for the growth and development of fruit trees. Spray Bordeaux or lime on the fruit surface can also reduce the incidence of sunburn. White trunks can be used in winter to ease the rapid changes in bark temperature. In addition, when the pruning, the direction of the tree's sunny direction should leave more branches to reduce the risk of sunburn.