Various Fertilizers, How much to Apply Per Acre

The determination of the amount of fertilizer applied can be divided into nutrient balance method, field test method, here first introduced the basic calculation principle of nutrient balance method. The basic concept of the nutrient balance method is that:

Crop nutrient uptake is equal to the sum of the nutrient supply of both soil and fertilizer.

Fertilizer provides some of the nutrients for the crop through the application of fertilizer. However, the amount of fertilizer applied to the crop is not exactly the same as the amount of fertilizer nutrients supplied. Since only a portion of the nutrients put on the farm are absorbed and used by the crop in the season, the amount of fertilizer applied can be derived from the following formula, taking into account the fertilizer utilization factor.

Planned crop fertilizer application (kg) = (total nutrients required for planned yield - soil nutrient supply) ÷ (fertilizer nutrient content × fertilizer utilization rate (%))

The amount of crop fertilizer applied is the amount of a particular nutrient element applied.

Specifically for fertilizer species, the amount of physical fertilizer is calculated by the following formula.

Planned crop fertilization amount (kg) = physical fertilizer dosage (kg) × active ingredient content (%), where

1. the total amount of nutrients required for the planned yield kg) = (planned yield / 100) × the amount of nutrients required for the formation of 100 kg of yield (refer to the table of the approximate amount of nutrients required for the formation of 100 kg of economic yield of different crops)

The planned yield is the average product yield of the local crop for 3 years increased by another 10%-15%.

2. Soil nutrient supply (kg) = (no fertilizer area yield / 100) × the number of nutrients required to form 100kg of yield per

Soil fertilizer supply 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. In general, the in-season utilization rate of fertilizers is 30%-35% for nitrogen, 20%-25% for phosphorus and 25%-35% for potassium.