In greenhouse vegetable cultivation in winter, the lack of calcium leaves, coke edge, lack of zinc leaflets, iron deficiency yellow, lack of boron top bud necrosis root growth, etc., a variety of deficiency syndromes are more and more difficult to distinguish, it is more difficult to control. It is well-known that the lack of vegetables is due to the fact that the root system does not absorb enough nutrients in time to perform abnormalities, but the root cause of malabsorption is not necessarily the lack of such an element in the soil. Most of the time it is due to the management of fertilization and watering. Improper measures lead to deterioration of soil properties, either the effective activity of nutrients in the soil or the poor growth of roots. Therefore, the winter greenhouse vegetable fertilization should pay attention to ten not appropriate.
It is not appropriate to use a large amount of uncooked cakes because the cakes contain more nitrogen, less carbon and nitrogen, and decompose more quickly. Locally, high temperatures and high concentrations of ammonia and organic acids are prone to be generated, and roots are easily burned. The crushed crushed straw should be added to the manure and urine, and the manure and urine should be soaked for about 3 to 5 weeks before high temperature fermentation.
Ammonium thiosulfate should not be used, and ammonium bicarbonate is a physiological acid fertilizer. After application, it will increase the acidity of the soil and damage the soil structure. After the application of ammonium bicarbonate, a large amount of ammonia gas is volatilized, which is unfavorable to the growth of vegetables in a highly permeable greenhouse.
It is not suitable to use chloride-containing chemical fertilizers to reduce the content of starch and sugar in vegetables, so that the quality of vegetables will be degraded and the yield will be reduced. Moreover, chloride ions will remain in the soil, which will lead to acidification of the soil and easily cause decalcification of the soil.
It is not appropriate to fertilize vegetables under drought conditions. It is a water-loving crop. Fertilizing when the soil is dry, not only can the fertilizer effect not be fully exerted, but also the concentration of soil solution can suddenly increase, and vegetables can be easily burned. Therefore, the fertilization of vegetables should be combined with irrigation, or fertilization should be carried out, and the fertilizer should be irrigated afterwards, or it can be top-dressed with water.
It is not appropriate to use a large amount of diammonium phosphate. Most vegetables need less phosphorus. Too much phosphorus will inhibit the absorption of trace elements. Diammonium phosphate should not be mixed with alkaline fertilizers such as grass ash to avoid ammonia volatilization and ammonia damage.
It is not advisable to top up the potassium fertilizer in the late growth stage of vegetables. Potassium fertilizer is generally required before and after flowering, and gradually decreases afterwards.
It is not appropriate to disperse phosphate fertilizers and phosphorus is easily absorbed and solidified by the soil and loses fertilizer efficiency. Therefore, it is best to use open-groove application of phosphate fertilizers as base fertilizer, or to concentrate on root-dense soil layers in the early stages of vegetables.
It is not advisable to apply large amounts of zinc and iron in the soil. Zinc and iron are difficult to be absorbed by the roots in the soil and the conduction is slow. Therefore, the base fertilizer can be added with appropriate amount of zinc-iron fertilizer, and when the vegetables are deficient in zinc, they are sprayed with foliar fertilizers containing zinc elements (such as the Chinese Medicator), and the effect is faster.
It is not appropriate to spray potassium and calcium at the same time to spray potassium and calcium. It is more difficult to be absorbed by the vegetable leaves and should avoid spraying together. However, boron and calcium, zinc and iron have better spray effect.
It is not appropriate to use a large amount of water-soluble fertilizer at one time and the soil temperature is low in winter, and the root absorption capacity is somewhat poor. A large number of fertilizers are applied at one time and the root system can absorb very little. The fertilizers gradually accumulated in the soil will in turn deteriorate the soil properties and reduce the Root absorption capacity. Therefore, in the winter, fertilization materials should be eaten less frequently.
It is not appropriate to use a large amount of uncooked cakes because the cakes contain more nitrogen, less carbon and nitrogen, and decompose more quickly. Locally, high temperatures and high concentrations of ammonia and organic acids are prone to be generated, and roots are easily burned. The crushed crushed straw should be added to the manure and urine, and the manure and urine should be soaked for about 3 to 5 weeks before high temperature fermentation.
Ammonium thiosulfate should not be used, and ammonium bicarbonate is a physiological acid fertilizer. After application, it will increase the acidity of the soil and damage the soil structure. After the application of ammonium bicarbonate, a large amount of ammonia gas is volatilized, which is unfavorable to the growth of vegetables in a highly permeable greenhouse.
It is not suitable to use chloride-containing chemical fertilizers to reduce the content of starch and sugar in vegetables, so that the quality of vegetables will be degraded and the yield will be reduced. Moreover, chloride ions will remain in the soil, which will lead to acidification of the soil and easily cause decalcification of the soil.
It is not appropriate to fertilize vegetables under drought conditions. It is a water-loving crop. Fertilizing when the soil is dry, not only can the fertilizer effect not be fully exerted, but also the concentration of soil solution can suddenly increase, and vegetables can be easily burned. Therefore, the fertilization of vegetables should be combined with irrigation, or fertilization should be carried out, and the fertilizer should be irrigated afterwards, or it can be top-dressed with water.
It is not appropriate to use a large amount of diammonium phosphate. Most vegetables need less phosphorus. Too much phosphorus will inhibit the absorption of trace elements. Diammonium phosphate should not be mixed with alkaline fertilizers such as grass ash to avoid ammonia volatilization and ammonia damage.
It is not advisable to top up the potassium fertilizer in the late growth stage of vegetables. Potassium fertilizer is generally required before and after flowering, and gradually decreases afterwards.
It is not appropriate to disperse phosphate fertilizers and phosphorus is easily absorbed and solidified by the soil and loses fertilizer efficiency. Therefore, it is best to use open-groove application of phosphate fertilizers as base fertilizer, or to concentrate on root-dense soil layers in the early stages of vegetables.
It is not advisable to apply large amounts of zinc and iron in the soil. Zinc and iron are difficult to be absorbed by the roots in the soil and the conduction is slow. Therefore, the base fertilizer can be added with appropriate amount of zinc-iron fertilizer, and when the vegetables are deficient in zinc, they are sprayed with foliar fertilizers containing zinc elements (such as the Chinese Medicator), and the effect is faster.
It is not appropriate to spray potassium and calcium at the same time to spray potassium and calcium. It is more difficult to be absorbed by the vegetable leaves and should avoid spraying together. However, boron and calcium, zinc and iron have better spray effect.
It is not appropriate to use a large amount of water-soluble fertilizer at one time and the soil temperature is low in winter, and the root absorption capacity is somewhat poor. A large number of fertilizers are applied at one time and the root system can absorb very little. The fertilizers gradually accumulated in the soil will in turn deteriorate the soil properties and reduce the Root absorption capacity. Therefore, in the winter, fertilization materials should be eaten less frequently.
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