How much fertilizer should be applied per acre? Just refer to this table for the calculation!

Many times, farmers tend to fertilize based on their experience or keep the amount of fertilizer per acre within their acceptable cost limit. However, in terms of reducing fertilizer input and improving fertilizer utilization, scientifically calculating the amount of fertilizer can truly help farmers save on planting costs.
The determination of fertilizer application rate can be divided into nutrient balance method and field experiment method. Here, we will first introduce the basic calculation principle of the nutrient balance method.
The basic concept of nutrient balance method: the nutrient absorption of crops equals the sum of nutrient supply from soil and fertilizer.
Part of the nutrients provided by fertilizers to crops needs to be applied through fertilization. However, the amount of fertilizer applied to crops is not exactly the same as the amount of nutrient supplied by the fertilizer. Because only a portion of the nutrients applied to the farmland is absorbed and utilized by the current season's crops, taking into account the fertilizer utilization rate, the amount of fertilizer applied can be calculated using the following formula:
Planned crop fertilization amount (kg) = (Total nutrient requirement for planned yield - Soil nutrient supply) ÷ (Fertilizer nutrient content × Fertilizer utilization rate (%))
Crop fertilization rate refers to the amount of a certain nutrient element applied.
Specifically for different types of fertilizers, the actual amount of fertilizer used needs to be calculated using the following formula:

Planned crop fertilization amount (kg) = Physical fertilizer application amount (kg) × Effective ingredient content (%)
among which
1. Total amount of nutrients required for planned yield (kg) = (planned yield / 100) × amount of nutrients required to form 100kg of yield (refer to the approximate amount of nutrients required to form 100kg of economic yield for different crops).

The planned production is based on an increase of 10%-15% over the average product yield of local crops over the past three years.
2. Soil nutrient supply (kg) = (Yield in the no-fertilizer area/100) × Nutrient quantity required to form 100kg of yield
The soil fertility is generally estimated through soil sampling and testing. In the absence of testing conditions, it can also be estimated based on the yield without fertilization (blank yield).
3. Generally, the seasonal utilization rate of fertilizers is as follows: nitrogen fertilizer is 30%-35%, phosphorus fertilizer is 20%-25%, and potassium fertilizer is 25%-35%.