Vegetable drought-resistant technical measures
1. The use of drought-resistant varieties and drought-producing species for selection of drought-resistant vegetable varieties and utilization of varieties for adaptability to drought conditions can effectively increase the utilization of water and thus ensure the output value of vegetables. The use of dry seed species can reduce the excessive dependence of vegetables on water and effectively reduce the impact of drought on vegetable production.
Second, the drought-resistant exercise (A) appropriate control of the water supply of vegetables and seedlings, seedlings, to promote the elongation of vegetable roots, improve the ability of vegetables to fight drought. (b) Anti-drought training of seeds before sowing. Before sowing, soak the seeds, and when the seeds are swelled and the radicles have just been exposed, put them in a cool place to air dry, and then sow the seeds to improve their ability to adapt to drought.
Third, centralized nursery seedlings can be centralized management of seedlings, reduce the amount of water used during seedling period, shading and mulching can also reduce costs.
Fourth, to strengthen the management of the cultivator (A) plastic film covering the use of mulching can reflect sunlight, lock in soil moisture, reduce the evaporation of soil moisture, so that the crop can grow normally in a long time drought environment. If there is no covering condition, or if it is difficult to cover the mulch, weeds can be used to reduce the direct sunlight to the ground and reduce the evaporation of soil moisture. (2) Timely shallow flooding will cause soil compaction (especially viscous soil), and the compacted soil will form a capillary channel to the ground. The deep soil moisture will rise through the capillary to the ground, thus increasing the evaporation of the soil moisture and aggravating it. Drought hazards. Therefore, after watering, when it is time to lower the feet, it is necessary to carry out shallow scabs (depth of 5-10 cm due to different vegetable species) and cut off the soil capillary to reduce the loss of soil moisture.
Fifth, reduce plant water loss Use growth retardants and anti-transpiration agents. CCC, B9, etc. can increase the water retention capacity of cells, and ABA can promote stomatal closure and reduce transpiration. The reflector (kaolin) sprays on the leaves, increasing the reflection of light and reducing transpiration. Inhibitors of stomatal opening, such as foliar spray 10-5 10-10 mol L-l phenylmercuric acid to shrink pores, the role can be maintained for 15-30 days, and no toxic effects. Spraying 10-3 mol L-l terpene succinic acid methyl ester can reduce transpiration by 20-30%, and can maintain 5-7 days.
Sixth, irrigation under reasonable irrigation conditions should grasp the critical period of vegetable water demand, so that the limited water play the biggest role. Irrigation should avoid high temperatures. For irrigation conditions, small water is used for ditch dipping as far as possible so as not to damage the structure of the top layer of soil and increase the loss of soil moisture. There is no irrigation condition and there is mainly water in the pond.
Seven, rational fertilization (a) fertilization methods and more decomposed farmyard fertilizer, top dressing should be thin, uniform, so as to avoid excessive concentration of fertilizer to reduce the absorption of water in vegetable roots, and even cause root burning, timely irrigation after application, or directly against Fertilizer application. (2) Fertilizer types The amount of nitrogen fertilizer should be moderate. Excessive amounts of vegetables are used to increase the amount of water required. Too little, the plants are thin and the drought resistance is low. Phosphate fertilizer and potash fertilizer can improve the drought resistance of plants. Boron and copper also contribute to the drought resistance of crops.
VIII. Pest and Disease Control High-temperature and drought will increase the occurrence and harm of vegetable pests and diseases. The prevention and control of pests and diseases under high-temperature and drought conditions must focus on prevention and comprehensive prevention and control. Disease prevention and control should be timely applied after the seedlings protective agents to prevent the occurrence and spread of the disease. Pests are treated with insecticidal lamps, yellow plates or sex attractants. In general, the prevention of pests and diseases in high-temperature and drought environments should be done with as little medication as possible. When medications must be used, the high-temperature time should be staggered and the concentration of the drug should be appropriately reduced to reduce the possibility of occurrence of phytotoxicity.
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Sodium cyclamate, CAS no.139-05-9, an artificial sweetener with two food grade, Plate (CP95) & Needle-like (NF13) grade, appears as a white needle-shaped or flaky crystalline powder. Manufacturing process via chemical synthesis, cyclohexane and sulfamic acid as the main raw materials. The sweet of Sodium cyclamate is 30–50 times sweeter than sugar. Sodium Cyclamate used widely in food manufacturing, such as drinks, candied fruits, preserved fruits, cosmetics, toothpaste, used for household seasonings, such as cooking,used as a substitute sugar in patients with diabetes and obesity, also in the pharmaceutical industry, for the production of the icings, syrups and the like.
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