The common features of fertilizer requirements
1. The nutrient requirement The large amount of vegetables has high biological yield. Therefore, the amount of fertilizer required per hectare is greater than that of food crops. For example, the average amount of nitrogen absorbed by vegetables is 4.4 times higher than that of wheat, 0.2 times higher than phosphorus, and 1.9 times higher than potassium. Calcium intake is 4.3 times higher and magnesium intake is 0.5 times higher.
2. The contents of nitrogen, phosphorus and potassium in stems and leaves of vegetables and vegetables with multiple nutrients taken away were 6.52, 7.08 and 2.32 times that of rice and wheat, respectively. The contents of nitrogen, phosphorus and potassium in seed or edible organs were 2.04 for rice and wheat, respectively. Times, 1.49 times and 6.91 times. So vegetables harvested products take more nutrients out of the soil.
3, there are special needs for certain nutrients (1) vegetables like nitric acid nitrogen; (2) the demand for potassium, calcium; (3) vegetables are more sensitive to boron and molybdenum.
Protected soil characteristics
1. Soil nutrient status in the protected area: According to the survey results of soil nutrients in 0-20 cm soil layers in some greenhouses in Jinan, Tai'an, Jining, Linyi, Rizhao, Heze, Zibo, and Weifang cities in 8 cities in Weifang City, the organic matter content in the greenhouses Average 17.0 g/kg, average 12.5 g/kg out of the shed; 126.15 mg/kg average in the alkali nitrogen shed, 60.11 mg/kg average out of the shed; 196.68 mg/kg average in the available phosphorus shed, and 68.45 mg/kg outside the shed. The average potassium concentration in the available potassium shed was 381.41 mg/kg and 180.44 mg/kg in the shed. The results of the survey showed that the soil nutrients in the shed were significantly higher than those outside the shed. The order was phosphorus> nitrogen> potassium> organic matter. Due to different planting years and fertilization levels and partial fertilization materials, the status of soil fertility in protected areas varies greatly, and the nutrients are not balanced, which needs to be resolved through balanced fertilization.
2. Salt concentration and acidity accumulation in protected areas The percentage of samples with 0.sup.2 cm to 0.2.sup. cm of soil in the shed accounted for 26.09% of the samples in the shed, which was 3.78 times the shed, the maximum value was 1.2%, and the average value was 0.27%. Salinization phenomenon. In each salt separator, the most accumulated soil in the shed was NO compared with the outside of the shed.
3- and K+ ions. Ca2-, Mg2-, Cl-, and SO42- have also accumulated in the soil. The accumulation of salt in the greenhouse is heavy, which is directly related to the irrational fertilization. Soil acidity test results, pH 0 ~ 20 cm than the shed outside the soil decreased by 0.46, there are more obvious acidification. (to be continued)
1. The nutrient requirement The large amount of vegetables has high biological yield. Therefore, the amount of fertilizer required per hectare is greater than that of food crops. For example, the average amount of nitrogen absorbed by vegetables is 4.4 times higher than that of wheat, 0.2 times higher than phosphorus, and 1.9 times higher than potassium. Calcium intake is 4.3 times higher and magnesium intake is 0.5 times higher.
2. The contents of nitrogen, phosphorus and potassium in stems and leaves of vegetables and vegetables with multiple nutrients taken away were 6.52, 7.08 and 2.32 times that of rice and wheat, respectively. The contents of nitrogen, phosphorus and potassium in seed or edible organs were 2.04 for rice and wheat, respectively. Times, 1.49 times and 6.91 times. So vegetables harvested products take more nutrients out of the soil.
3, there are special needs for certain nutrients (1) vegetables like nitric acid nitrogen; (2) the demand for potassium, calcium; (3) vegetables are more sensitive to boron and molybdenum.
Protected soil characteristics
1. Soil nutrient status in the protected area: According to the survey results of soil nutrients in 0-20 cm soil layers in some greenhouses in Jinan, Tai'an, Jining, Linyi, Rizhao, Heze, Zibo, and Weifang cities in 8 cities in Weifang City, the organic matter content in the greenhouses Average 17.0 g/kg, average 12.5 g/kg out of the shed; 126.15 mg/kg average in the alkali nitrogen shed, 60.11 mg/kg average out of the shed; 196.68 mg/kg average in the available phosphorus shed, and 68.45 mg/kg outside the shed. The average potassium concentration in the available potassium shed was 381.41 mg/kg and 180.44 mg/kg in the shed. The results of the survey showed that the soil nutrients in the shed were significantly higher than those outside the shed. The order was phosphorus> nitrogen> potassium> organic matter. Due to different planting years and fertilization levels and partial fertilization materials, the status of soil fertility in protected areas varies greatly, and the nutrients are not balanced, which needs to be resolved through balanced fertilization.
2. Salt concentration and acidity accumulation in protected areas The percentage of samples with 0.sup.2 cm to 0.2.sup. cm of soil in the shed accounted for 26.09% of the samples in the shed, which was 3.78 times the shed, the maximum value was 1.2%, and the average value was 0.27%. Salinization phenomenon. In each salt separator, the most accumulated soil in the shed was NO compared with the outside of the shed.
3- and K+ ions. Ca2-, Mg2-, Cl-, and SO42- have also accumulated in the soil. The accumulation of salt in the greenhouse is heavy, which is directly related to the irrational fertilization. Soil acidity test results, pH 0 ~ 20 cm than the shed outside the soil decreased by 0.46, there are more obvious acidification. (to be continued)
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