What do you know about fertilizer application?

The determination of fertilizer amount can be divided into nutrient balance method and field experiment method.Fertilizer application quantity of fertilizer is also strictly public, and the basic calculation principle of nutrient balance method is introduced here.
The basic concept of nutrient balance method is that the nutrient uptake of crops is equal to the sum of the nutrient supply of soil and fertilizer.Some of the nutrients that the fertilizer provides to the crop are fertilized, but the amount of fertilizer applied to the crop is not exactly the same as the nutrient supply of the fertilizer, because only a portion of the nutrients that are put into the field are absorbed by the crop of the season.
Taking into account the fertilizer utilization factor, the fertilizer application amount can be calculated by the following formula:
Amount of fertilizer applied to planned crops (kg) = (total nutrient needed for planned output - soil nutrient supply).
The amount of fertilizer applied to a crop is the amount of a nutrient element.Specific to the fertilizer varieties, the actual fertilizer dosage should be calculated through the following formula:
Planned crop fertilizer (kg) = in-kind fertilizer (kg) x active component (%)
Where: 1. Total nutrient requirements (kg) for planned yield = (planned yield /100) x each formation of 100kg
The amount of nutrients required for yield (referring to the approximate amount of nutrients required for the formation of 100kg economic yield of different crops), the planned yield is another 10%-15% increase in the 3-year average product yield of local crops.
2. Soil nutrient supply (kg) = (no fertilizer area yield /100) x amount of nutrients required for each yield of 100kg
Soil fertility is estimated by soil sampling and analysis.In the absence of laboratory conditions, estimates can also be made through unfertilized yield (blank yield).
3. Generally, the seasonal utilization rate of fertilizer is: 30% to 35% of nitrogen fertilizer, 20% to 25% of phosphate fertilizer and 25% to 35% of potash fertilizer.