Improper or excessive application of chemical fertilizers in crops can lead to long leaves and lodgings, aggravation of pests and diseases, or burning of seedlings, wilting, light production, and serious death of the entire plant.
First, the cause of the damage
1. Loss of water, such as one application of chemical fertilizer or excessive human and animal excrement, or insufficient water when fertilizing, so that the concentration of soil solution is too high, the root cells are difficult to absorb water, and even lose water, which may cause burning or wilting.
2. Burns When too much ammonium bicarbonate, urea or undecomposed organic fertilizer is applied, a large amount of ammonia gas and a large amount of ammonia gas can burn the leaves of the crop.
3. Poisoning If excessive application of certain elements causes excessive excess of the element, causing poisoning; when excessive application of nitrogen fertilizer, nitrogen fertilizer will often produce nitrous acid accumulation during the digestion process, and nitrite poisoning occurs, which is characterized by browning of the roots and leaves. Turn yellow and so on.
Second, the prevention of fertilizer damage
1. Adding organic fertilizers Organic fertilizers in the process of decomposition, and the formation of inorganic-organic colloids with soil particles, can adsorb more cations applied to fertilizers, so that the concentration of soil solution does not rise too high, play a buffering role, reduce The occurrence of fat damage.
2. Rational application of chemical fertilizer According to the nutritional characteristics of the crop, nitrogen, phosphorus, potassium and micro-fertilizer should be applied together, and the application method and application amount should be paid attention to. Generally, the heavy base fertilizer is lightly topdressed, and the amount of topdressing can not be excessive. In addition, the application of ammonium bicarbonate per mu shall not exceed 30 kg and the urea shall not exceed 10 kg.
3. Other measures When the fat damage occurs, other remedial measures can be taken. For example, if the wheat has too much nitrogen fertilizer and is easy to fall, it can alleviate the occurrence of fertilizer by applying phosphorus or potassium fertilizer, or spraying the potassium dihydrogen phosphate and the grass ash liquid on the foliar surface.
First, the cause of the damage
1. Loss of water, such as one application of chemical fertilizer or excessive human and animal excrement, or insufficient water when fertilizing, so that the concentration of soil solution is too high, the root cells are difficult to absorb water, and even lose water, which may cause burning or wilting.
2. Burns When too much ammonium bicarbonate, urea or undecomposed organic fertilizer is applied, a large amount of ammonia gas and a large amount of ammonia gas can burn the leaves of the crop.
3. Poisoning If excessive application of certain elements causes excessive excess of the element, causing poisoning; when excessive application of nitrogen fertilizer, nitrogen fertilizer will often produce nitrous acid accumulation during the digestion process, and nitrite poisoning occurs, which is characterized by browning of the roots and leaves. Turn yellow and so on.
Second, the prevention of fertilizer damage
1. Adding organic fertilizers Organic fertilizers in the process of decomposition, and the formation of inorganic-organic colloids with soil particles, can adsorb more cations applied to fertilizers, so that the concentration of soil solution does not rise too high, play a buffering role, reduce The occurrence of fat damage.
2. Rational application of chemical fertilizer According to the nutritional characteristics of the crop, nitrogen, phosphorus, potassium and micro-fertilizer should be applied together, and the application method and application amount should be paid attention to. Generally, the heavy base fertilizer is lightly topdressed, and the amount of topdressing can not be excessive. In addition, the application of ammonium bicarbonate per mu shall not exceed 30 kg and the urea shall not exceed 10 kg.
3. Other measures When the fat damage occurs, other remedial measures can be taken. For example, if the wheat has too much nitrogen fertilizer and is easy to fall, it can alleviate the occurrence of fertilizer by applying phosphorus or potassium fertilizer, or spraying the potassium dihydrogen phosphate and the grass ash liquid on the foliar surface.
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