The determination of the amount of fertilizer is more complicated. It is necessary to comprehensively consider the types of fertilizers, the nutrient absorption characteristics of crops, the soil fertility and the amount of fertilizer applied to the crops and the farming system. The most common method for determining the amount of fertilizer is to combine soil testing and fertilization. The amount of fertilizer applied is determined according to the target yield, that is, the target yield method. Door Handles,Ss Glass Door Handle,Sliding Glass Door Handle,Stainless Steel Glass Door Handle Foshan City, Nanhai District Huidexing Stainless Steel Products LTD., , https://www.huidexing.net
Determination of the amount of fertilizer applied to greenhouse tomatoes
(1) The basic principle of the target yield method According to Chen Lunshou's introduction in Vegetable Nutrition and Fertilization Technology, the basic principle of the target yield method is to determine the fertilization difference between the nutrient content and the soil supply nutrients required to achieve the target yield of the crop. The basis of the amount to get the balance of nutrients.
Fertilizer = {[× nutrient uptake capacity per unit of production output goals] - soil nutrient supply} / (the nutrient content of the fertilizer × season fertilizer utilization)
Soil nutrient soil nutrient supply a measured value = 0.15 × (conversion factor per 667 square meter) × soil nutrient utilization coefficient of
Target yield: based on greenhouse conditions, cultivars, management levels and growers' expectations.
Nutrient uptake per unit of production: According to the relevant data, each tomato needs to absorb nitrogen (N) 4.5 kg, phosphorus (P205) 1.0 kg, and potassium (k2O) 5.0 kg for each kilogram of fruit formed.
Soil nutrient utilization factor: According to the relevant data, the soil nutrient utilization coefficient of different soil forces of tomato.
(2) The target yield method is used to calculate the amount of fertilization. Set a greenhouse to be a medium-fertilizer soil. The soil available nutrient content before the planting is 65 mg/kg of available nitrogen, 1.0 mg/kg of quick-acting phosphorus, and 160 mg of available potassium. In kilograms, it is planned to apply 2 000 kg of high-quality chicken manure per 667 square meters, 10 cubic meters of high-quality manure (1 000 kg), and plant a winter season with a large season of tomato. The target yield per 667 square meters is estimated to be 15,000 kg. 1 Calculate the target yield of 15 000 kg of fertilizer required nitrogen = 4.5 × 15 = 67.5 (kg) Phosphorus demand = 1.0 × 15 = 15.0 (kg) Potassium requirement = 5.0 × 15 = 75.0 (kg) 2 Calculate the soil Nutrient supply soil nitrogen supply = 65 × 0.15 × 0.74 = 6.77 (kg) Soil phosphorus supply = 10.5 × 0.15 × 2.29 (conversion coefficient of P to P205) × 0.51 = 1.84 (kg) Soil nitrogen supply = 65 ×0.15 ×1.2 (conversion coefficient of K to K2O) ×0.55=15.84 3 Calculate the available nitrogen content of the organic fertilizer in the applied organic fertilizer = chicken manure 2000×1.63%×0.2 (organic fertilizer utilization coefficient) + manure 1000 × 0.5% × 0.2 = 7.52 (kg)
Organic fertilizer available phosphorus = chicken manure 2000 × 1.54% × 0.2 (organic fertilizer utilization factor) + manure fertilizer 1000 × 0.45% × 0.2 = 7.06 (kg)
Potassium content of organic fertilizer = chicken manure 2000 × 0.85% × 0.2 (organic fertilizer utilization coefficient) + manure fertilizer 1000 × 0.7% × 0.2 = 4.80 (kg) 4 Calculate the amount of nitrogen should be applied = 67.5-6.77-7.52 = 53.18 (kg) should be applied phosphorus = 15-1.84-7.06 = 6.10 (kg)
= The amount of potassium should 75-15.84-4.80 = 54.36 (kg) ⑤ calculated according to the amount of fertilizer urea cyanide (N) 46%, 40% utilization rate calculation season
The amount of urea should be applied = 53.18 / (0.46 × 0.6) = 192.7 (kg). According to the calcium phosphate containing phosphorus (P205) 14%, the quarter utilization rate is 20%
Should pass the amount of calcium phosphate = 6.10 / (0.14 × 0.3) = 145.2 (kg)
Press potassium sulfate potassium (K20) 50%, quarter utilization rate of 50% calculated
The amount of potassium sulfate should be applied = 54.36 / (0.5 × 0.6) = 181.2 (kg)
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