As the saying goes, "A crop of flowers, all rely on fat to become a home," can imagine how important fertilizer is to crops. Different crops have different fertilization rates. To ensure high yield and quality of crops, scientific fertilization is very necessary. Today, Xiaobian introduces those things that introduce fertilization during planting. First, the main crop unit yield nutrient demand Nutrient calculation method The determination of fertilization amount can be divided into nutrient balance method and field test method. In view of the work needs of agricultural resource dealers, this paper introduces the basic calculation principle of nutrient balance method. Nutrient balance method: refers to the nutrient absorption of crops equal to the sum of nutrient supply of soil and fertilizer. Part of the nutrients needed for crops are made by fertilization. The amount of crop fertilization and fertilizer nutrient supply are not exactly the same. In farmland nutrients, only part of the nutrients are absorbed by the season crops, so we must also consider factors such as fertilizer utilization. Calculation formula Planned crop fertilization amount (kg) = (total nutrient required for planned yield - soil nutrient supply) ÷ (fertilizer nutrient content × fertilizer utilization rate (%) 1. Total nutrient required for planned production (Kg) = (planned yield / 100) × number of nutrients required for each 100 kg of production (refer to the approximate amount of nutrients required for the formation of 100 kg of economic yield for different crops). The planned output is an additional 10%-15% increase in the average annual production of local crops. 2. Soil nutrient supply (kg) = (no fertilizer area yield / 100) × number of nutrients required for each 100 kg of production. In the absence of assay conditions, estimates can be made by yield (blank yield) without fertilization. In addition, it can be estimated by simple soil sampling test, the supply of soil nutrients = soil measured value × 0.16 3, the content of fertilizer nutrients: can be seen on the packaging of fertilizers. 4. Fertilizer utilization rate: Under normal circumstances, the utilization rate of chemical fertilizers in the current season is: 30%-35% of nitrogen fertilizer, 20%-25% of phosphate fertilizer, and 25%-35% of potash fertilizer. Second, an example Step 1: Find crop nutrient requirements For example, every 100 kg of grain produced by spring wheat needs to be absorbed: nitrogen (N) 3 kg, phosphorus (P) 1 kg, and potassium (K) 2.5 kg. Step 2: Calculate the total amount of nutrients needed for production The planned output is a 10%-15% increase in the average annual production of local crops. For example, the yield of spring wheat is 600kg. Nitrogen (N): (600/100) × 3 = 18 kg; Phosphorus (P): (600/100) × 1 = 6kg; Potassium (K): (600/100) × 2.5 = 15kg; Step 3: Calculate soil nutrient supply The measured soil available nitrogen content of the plot is 64ppm (mg/kg), available phosphorus 14ppm (mg/kg), and effective potassium 60ppm (mg/kg). Nitrogen (N): 64 × 0.16 = 12.24 kg; Phosphorus (P): 14 × 0.16 = 2.24 kg; Potassium (K): 60 × 0.16 = 9.6 kg; Step 4: Calculate the amount of fertilizer needed for crops Nitrogen (N): 18-10.24 = 7.76kg; Phosphorus (P): 6-2.24 = 3.76kg; Potassium (K): 15-9.6 = 6.4 kg; Step 5: Calculate the amount of fertilizer applied to the crop How much should I use if I apply 15-15-15 compound fertilizer? Then calculate. Based on the lowest demanded phosphate fertilizer: fertilizer application rate: 3.76 / (15% × 25%) = 100kg. Then add the additional two nutrients. Supplemented urea: (7.76-3.76) / (46% × 35%) = 24.8kg; Supplemented potassium sulfate: (6.4-3.76) / (44% × 35%) = 17.1 kg; Note: The urea nitrogen content is 46% and the potassium sulfate potassium content is 44%. Therefore: spring wheat with a yield of 600kg per mu requires 125kg of compound fertilizer, 28.9kg of urea and 24kg of potassium fertilizer. After reading this example, do you understand? For crops, fertilizer has a double-sided effect. When applied properly, it will increase the yield and quality of crops. However, if the fertilizer is not applied properly, it will cause fertilizer damage and reduce crop yield. Or death, so the amount of fertilizer used by farmers should pay attention. China Extract Powder For Use As Dietary Supplement Extract Powder, Extract Powder Manufacturer Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.anabolicsteriod.com
