Nutrient balance method is mainly used to determine the amount of fertilizer. The basic concept of nutrient balance method is that the nutrient absorption of crops is equal to the sum of nutrient supply of soil and fertilizer.
An organic fertilizer making machine converts fertilizer and straw into organic fertilizer. Part of the nutrients provided by chemical fertilizer for crops must be realized by fertilization. However, the amount of fertilizer applied to crops is not exactly the same as the nutrient supply of fertilizer. Since the crops in the current season only absorb and utilize part of the nutrients entering the farmland, considering the fertilizer utilization rate, the fertilizer amount can be calculated by the following formula:
Planned fertilizer amount (kg) = (total nutrients required for planned yield – soil nutrient supply) × fertilizer nutrient content × fertilizer utilization rate (%)
The amount of fertilizer applied to crops refers to the amount of certain nutrient elements. For specific chemical fertilizer varieties, the actual amount of chemical fertilizer should be calculated according to the following formula:
Planned crop fertilizer amount (kg) = physical fertilizer amount (kg) × active ingredient content (%)
1. The total amount of nutrition required for planned yield (kg) = (planned yield / 100) × the amount of nutrition required per 100kg yield.
The plan is to increase the average yield of local crops by 10% to 15% in three years.
2. Soil nutrient supply (kg) = (yield of no fertilizer area / 100) × the amount of nutrient required per 100kg yield.
Soil fertility is usually estimated by soil sampling and testing. In the absence of laboratory conditions, it can also be estimated by the yield without fertilization (blank yield).
3. Generally speaking, the fertilizer utilization rate in current season is 30% – 35% for nitrogen fertilizer, 20% – 25% for phosphorus fertilizer and 25% – 35% for potassium fertilizer. According to the proportion, the double roll granulator can be used to treat NPK fertilizer.
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