In the production process, due to improper fertilizer application by many farmers, the quality of crops is deteriorated and the yield is reduced, so it should be paid enough attention. Cause of fat First, the fertilizer concentration is too large. When the fertilizer is applied too much or the soil moisture is insufficient after fertilization, the concentration of the soil solution is too high, and the roots of the crop are difficult to absorb water, causing the plants to wilting or even die. For example, when the salt concentration in the soil solution reaches 0.3%, the absorption of fertilizer and water by vegetables and other crops will be hindered, and reverse osmosis will occur. The roots of the root hair cells will lose water and cause physiological drought. If the nitrogen is excessive, the ammonia will dissolve when it encounters the mist in the air and the water droplets on the leaves of the crop, forming an alkali mist or alkaline small water droplets, burning the crop and producing scorch spots on the crop. Excessive application of certain nutrients to crops not only poisons crops, but also hinders the absorption of other nutrients by crops and causes deficiency. For example, excessive nitrogen application can cause calcium deficiency. Excessive nitrate nitrogen can cause chlorosis in the absence of molybdenum. Too much potassium will reduce the effectiveness of calcium, magnesium and boron. Too much phosphorus will reduce the effectiveness of calcium, zinc and boron. The second is the danger of toxic gases. In some places, the application rate of nitrogen fertilizer is getting larger and larger, especially the application of volatile nitrogen fertilizer, such as ammonium bicarbonate, ammonia water, etc., which is easy to produce ammonia gas. For example, in the production of melon seedbed or greenhouse, dry ammonia and urea are prone to ammonia volatilization. This is because ammonium ions are converted to nitrous acid under the action of nitrosating bacteria, and the nitrogen dioxide gas produced by the nitrous acid gasification will poison the crops, and irregular water-like plaques appear on the leaves of the crops, and the veins gradually turn white. The third is the "fertilizer" heat damage. Fresh pig cow dung, chicken and duck manure and green manure are directly applied without being fertilized, and the application amount is large. The fertilizer produces organic acid and heat during the decomposition process, causing damage to the root of the crop and causing damage. The fourth is near root fertilization. Some people in the fertilization think that the closer the fertilizer is to the root of the crop, the faster the absorption and the better the effect. When fertilizing, the roots of the crop are often applied to the roots, and the most active root layer of the root is destroyed, weakening or losing its absorption. The ability to fertilize water, crops may show bruises or internal injuries. The first countermeasure is to increase the application of organic fertilizer and improve the soil buffer capacity. The use of organic colloids, adsorption of chemical fertilizer cations, reduce soil solution concentration, improve soil nutrient buffer capacity, can effectively reduce and avoid crop damage. The second is to promote full-scale deep fertilization. Full-scale deep fertilization can evenly distribute the fertilizer throughout the tillage layer, and the amount of cations adsorbed by the soil is relatively increased, and the concentration of the soil solution does not rise too high, thereby protecting the crop from damage. The third is not to apply "raw" fertilizer. Dryland crops are easy to “burn rootsâ€, and unfertilized green manure, compost, and cake fertilizer are applied in paddy fields. During the decomposition process, a large amount of toxic substances such as ferrous iron and hydrogen sulfide are produced, which are oil-like suspensions, which are directly or indirectly inhibited. The metabolism of rice leads to "squatting" and forming a dead seedling. The fourth is limited application of chemical fertilizer. The application rate of chemical fertilizer is too large, neither scientific nor safe. The amount of chemical fertilizer applied per mu is determined by soil fertility, seedling condition and soil quality. Usually, the application of ammonium carbonate per mu should not exceed 60 kg, and ammonium chloride should not exceed 40 kg, urea should not exceed 20 kg. Crops and seedlings that are not resistant to fertilizer are appropriately reduced, and sandy fields should be “eat less and eat more†to prevent leakage. The fifth is fertilization at a fixed distance. The application of acupoints, point application, and ditch application of chemical fertilizers should not be too close to the roots, and it is even more unreliable. Generally, shallow root crops and seedlings should be treated with chemical fertilizers 10 to 15 cm away from roots, and deep root crops and medium and large seedlings should be separated from roots by 18~ 25 cm is appropriate, so as not to damage the roots and lead to dead seedlings. Sixth, fertilization in the seedbed and protective land, in addition to the above fertilization requirements, but also pay attention to proper window ventilation, to prevent ammonia accumulation, to properly water, to keep the soil moist, reduce the concentration of soil solution, to avoid excessive concentration hurt. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Reusable Washable Bed Underpad Details,Breathable Film Incontinence Pads,Underpads With Adhesive Strip,Incontinence Bed Pads,Disposable Underpads Underpads,Medical Reusable Washable Underpads,Adult Waterproof Washable Mattress Pads,Soft Breathable Washable Underpads Honghu Danielle Sanitary Material Co., Ltd. , https://www.daniellecn.com