Fertilizer sprayed on plants has outstanding advantages such as less dosage, quick effect, high fertilizer efficiency, and good effect, and has been widely promoted and applied in recent years. However, due to the mistaken belief among some rural households that foliar spraying is like adding nutrition to people, it is “beneficial to be harmless and more beneficialâ€. Therefore, there are arbitrarily selected types of fertilizers, arbitrary increase of fertilizer dosages, random determination of fertilizer application time, and random use. Increasing the number of spraying fertilizers not only affects the effect of foliar spraying, but also sometimes causes damage to plants in varying degrees. A large number of surveys have shown that the implementation of foliar spray fertilizer on plants should at least pay attention to the following points: 2. Fertilizer concentration: Some farmers believe that the concentration of fertilizer solution is a bit larger and the spray fertilizer effect is better. However, different crops have different fertilizer tolerances at different times. Fertilizer concentration is too high, often resulting in fertilizer damage leaves. Especially when the temperature is higher, spraying fertilizer on the leaves of the plants, in the appropriate concentration range, in principle, we should grasp "it is not high on the low." In addition, in the seedling stage of the plant, the leaf tissue is young and the concentration of the spray fertilizer should be appropriately lower; the concentration of spraying in middle and later stages can be appropriately higher; when the crop is growing normally, the concentration should be lower, and when the deficient fertilizer is present, The concentration should be appropriately higher; the concentration of sprayed trace element fertilizer should be lower, and the concentration of elemental fertilizers for spraying constants can be appropriately higher; the concentration of the dicotyledonous plants sprayed should be appropriately lower; spraying monocotyledonous plants, the concentration can be appropriately higher. . Different foliar fertilizer, spraying concentration is generally: urea 0.5% -2.0%, superphosphate 1% -5%, potassium dihydrogen phosphate 0.2% -0.5%, boric acid 0.1% -0.5%, molybdic acid amine 0.02% - 0.05%, zinc sulfate 0.05% -0.2%. 3, spray fertilizer time: Some farmers believe that in any period of plant growth and development, any time can be implemented leaf spray fertilizer, it is not. From the fertilizer spraying stage, fertilizers should generally be sprayed when the plant grows and develops, and when the leaf area is large at the later stage, the effect is best. Spraying fertilizer when the leaf area of ​​the plant is small is not only a waste of fertilizer but also less effective. In addition, there are certain differences in the suitable period for spraying fertilizer on different plants and different fertilizers. Rice, wheat, corn and other cereal crops should be fertilized in the booting, flowering and filling stages. Soybeans, peanuts, broad beans, beans and other legumes should be sprayed during flowering and podging. Cotton should be sprayed during flowering. Molybdenum should be sprayed before flowering. Boron and zinc fertilizers should be sprayed best at the initial flowering stage. From the time of spraying the fertilizer, it should be dried on a cloudy day with no wind or sunny morning, and avoid spraying in the hot days of the hot sun. If there are drops of water or dew on the leaves during spraying, the concentration of fertilizer solution will be reduced and the effect of fertilizer application will not be achieved. If the fertilizer is sprayed at high temperatures in the hot sun, the air humidity is low, not only the fertilizer solution is evaporated and wasted, but also the fertilizer solution is quickly dried after spraying, the leaves are difficult to absorb, the utilization rate of the fertilizer is reduced, and sometimes the fertilizer solution on the blade is also used. The water evaporates too quickly and the concentration increases rapidly causing "burning of leaves." Medical Imaging,U Arm System,Mobile Patient Table,Compact Dr System MinFound Medical Systems Co., Ltd , https://www.minfoundmed.com
1. Types of Fertilizer: Many farmers believe that no matter what kind of fertilizer, as long as the fertilizer is “openedâ€, it can be sprayed with foliar fertilizer. This is not the case. For example, some highly volatile fertilizers (such as ammonia, ammonium bicarbonate) may cause damage to crops after spraying, and they cannot be used as foliar fertilizers. In addition, some crops (such as tea leaves, tobacco leaves, artichokes, and oranges) are chlorine-tolerant plants. Potassium chloride, calcium chloride, and other chlorinated fertilizers cannot be sprayed on such crops. In addition, we need to see seedling fertilizer: If the crop grows slowly, thin, short, yellow leaves, is a nitrogen deficiency, foliar spray fertilizer should be dominated by nitrogen, with a small amount of phosphorus and potassium fertilizer; conversely, if the plant leaf, Green, internodes, adequate nitrogen, foliar spray fertilizer should be replaced by phosphorus, potash-based, can not be immutable.
4. Number of sprays: Many farmers believe that the number of sprayed leaves is better. In fact, plants with short growth periods can usually be sprayed 1-2 times. Plants with long growth periods can be sprayed 2-3 times. And each spraying time, generally should be spaced more than 7-10 days. For trace element fertilizers, the spraying frequency should not be too high, and the concentration should not be too large, otherwise it will not only fail to increase the yield, but will also cause plant trace element poisoning.
In addition to considering the above factors, it should also pay attention to the first, although the amount of leaf fertilizer is small, but must be fully dissolved and stir to spray, and second, the back of the plant leaves less keratin, many holes, easy to absorb, so the foliage spray should be The main leaf is back, and the foliar is supplemented. Third, some foliar fertilizers can be mixed with fertilizers or pesticides, but there are also many that cannot be used arbitrarily, otherwise it will affect fertilizer efficiency and efficacy, and sometimes it will cause damage to the plants. (Xiongfei, Zhushan County Bureau of Agriculture, Hubei Province)