(1) Organic fertilizer Organic fertilizer is generally used as a base fertilizer, and is often applied before ploughing. In order to improve the fertilizer efficiency, it is best to concentrate the ditch when planting the fruit and vegetables with larger row spacing, pay attention to layering application, and mix with the soil. In order to prevent secondary salinization of the soil, organic fertilizer is often applied in a large amount in the greenhouse. At this time, it can be applied 1/2 to 2/3, and the remaining 1/2 to 1/3 of the concentrated ditch or acupoint application. When using human excrement or the like for top dressing, it can be diluted and poured or directly applied with water.
(2) Nitrogen fertilizer Nitrogen fertilizer is a quick-acting fertilizer. It is generally used as a top-loading application. It should be buried 5 to 10 cm deep in the application. Especially in the greenhouse, it should not be applied to the surface to avoid the ammonia hazard. Can be followed by water. Nitrogen fertilizer can also be used as a seed fertilizer. When the nitrogen supply in the soil is insufficient or the nitrogen absorbed by the plant can not meet the needs, it can also be sprayed on the foliar surface. Only urea in the nitrogen fertilizer is suitable for foliar spraying, and the spraying effect is best when the leaf area is basically reached to the maximum.
(3) Phosphate fertilizer In order to improve the utilization rate of phosphate fertilizer, the phosphate fertilizer should be concentrated in deep application, and it can also be applied in a layered manner, which is beneficial to the root system absorption. When the soil is applied, the granular phosphate fertilizer such as diammonium phosphate has better effect than the powdered phosphate fertilizer, and the effective phosphorus content is high. Phosphate fertilizer can also be used for foliar spraying and soaking, and the soaking concentration is preferably 0.4% to 0.5%.
(4) Potassium fertilizer Potassium fertilizer is mostly used as base fertilizer and fixed plant fertilizer, which can be concentrated in ditch application. Shallow root vegetables can also be scattered on the surface and mixed with topsoil. Potassium sulphate, which has a high decomposition rate, can be used as a top dressing. When applied, it is burrowed into the ground near the rhizosphere of the plant. Because its solubility and mobility are lower than nitrogen fertilizer, it can be applied 2 to 4 days earlier than nitrogen fertilizer, and applied 5 to 7 days before the critical period of potassium requirement.
(5) Trace elements Most soils are not deficient in trace elements, but continuous cropping in the greenhouse often leads to obstacles or lack of absorption of trace elements in the soil. Different vegetable crops have different sensitivities to trace element deficiency. The production should be based on the difference in vegetable types and growth and development performance.
The trace elements are mostly sprayed on the foliar surface, and the spraying concentration is usually 0.2% to 0.5%. The application concentration of copper and molybdenum should be appropriately lowered. Foliar application is best before and after the evening, and the liquid is not easy to air dry, which is convenient for the leaves to absorb. It is best to spray wet on both sides of the spray, and the amount of liquid per hectare is 375-750 kg.
(2) Nitrogen fertilizer Nitrogen fertilizer is a quick-acting fertilizer. It is generally used as a top-loading application. It should be buried 5 to 10 cm deep in the application. Especially in the greenhouse, it should not be applied to the surface to avoid the ammonia hazard. Can be followed by water. Nitrogen fertilizer can also be used as a seed fertilizer. When the nitrogen supply in the soil is insufficient or the nitrogen absorbed by the plant can not meet the needs, it can also be sprayed on the foliar surface. Only urea in the nitrogen fertilizer is suitable for foliar spraying, and the spraying effect is best when the leaf area is basically reached to the maximum.
(3) Phosphate fertilizer In order to improve the utilization rate of phosphate fertilizer, the phosphate fertilizer should be concentrated in deep application, and it can also be applied in a layered manner, which is beneficial to the root system absorption. When the soil is applied, the granular phosphate fertilizer such as diammonium phosphate has better effect than the powdered phosphate fertilizer, and the effective phosphorus content is high. Phosphate fertilizer can also be used for foliar spraying and soaking, and the soaking concentration is preferably 0.4% to 0.5%.
(4) Potassium fertilizer Potassium fertilizer is mostly used as base fertilizer and fixed plant fertilizer, which can be concentrated in ditch application. Shallow root vegetables can also be scattered on the surface and mixed with topsoil. Potassium sulphate, which has a high decomposition rate, can be used as a top dressing. When applied, it is burrowed into the ground near the rhizosphere of the plant. Because its solubility and mobility are lower than nitrogen fertilizer, it can be applied 2 to 4 days earlier than nitrogen fertilizer, and applied 5 to 7 days before the critical period of potassium requirement.
(5) Trace elements Most soils are not deficient in trace elements, but continuous cropping in the greenhouse often leads to obstacles or lack of absorption of trace elements in the soil. Different vegetable crops have different sensitivities to trace element deficiency. The production should be based on the difference in vegetable types and growth and development performance.
The trace elements are mostly sprayed on the foliar surface, and the spraying concentration is usually 0.2% to 0.5%. The application concentration of copper and molybdenum should be appropriately lowered. Foliar application is best before and after the evening, and the liquid is not easy to air dry, which is convenient for the leaves to absorb. It is best to spray wet on both sides of the spray, and the amount of liquid per hectare is 375-750 kg.
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