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Will the Fertilizer Expire after a Long Time?

Aug. 22, 2019

According to the characteristics of the fertilizer, as long as the fertilizer is properly stored, the package is not damaged, not exposed to rain, moisture, or mixed with alkaline substances, and can be stored for a long time.

For example, chemical fertilizers such as superphosphate and potassium sulphate can be stacked in a cool and dry warehouse for 20 years. There is no change in the nutrient content and other indicators except for the agglomeration of fertilizer.

If the fertilizer is released for a long time, some will fail, and some will not be invalid. The specific fertilizer depends on the variety. As a DAP Fertilizer Supplier, we now introduce several major commonly used varieties as follows:

1. The hydrogen carbonate will not fail and will only lose weight.

In winter, when the temperature is around 0 °C, the fertilizer effect hardly changes. Farmers' friends can take advantage of the seasonal price reduction of ammonium bicarbonate in winter, and it is appropriate to purchase ammonium bicarbonate for spring plowing.

In the summer when the temperature is above 30 °C, the ammonium bicarbonate will volatilize a lot, and the very dry ammonium bicarbonate will become wet due to the volatilization of ammonia, which will reduce the weight of the ammonium bicarbonate. Therefore, it is necessary to tighten the bag to prevent moisture and reduce losses.

However, ammonium bicarbonate will not fail due to long-term release, and the fertilizer efficiency is still very good. According to the dry weight calculation, the fertilizer efficiency does not drop. Farmer friends can't see the loss as invalid.

2. The effect of superphosphate does not change.

In case of rain, the loss of fertilizer will be worse. For example, superphosphate produced from phosphate rock with high iron and aluminum content should not be stored for one year. Because, after about 170 days of storage, the calcium carbonate contained therein can be slowly converted into iron phosphate or aluminum phosphate and becomes a poorly soluble substance, and the fertilizer efficiency is deteriorated.

3. Potassium chloride and potassium sulfate are stable

Potassium chloride and potassium sulfate are very stable compounds. When they are agglomerated with water, they are applied after crushing. The potency of Potassium Fertilizer is unchanged. However, the dosage is calculated on a dry basis at the time of application.

Potassium Fertilizer

Potassium Fertilizer

4. DAP is afraid of high temperature

Phosphate Fertilizer will gradually change to monoammonium phosphate when the temperature is above 30 °C, and a small amount of ammonia volatilizes. Therefore, the stored diammonium phosphate should be tightly packed to prevent ammonia volatilization.

5. Ferric sulfate will deteriorate due to moisture absorption

Ferrous sulfate is a strong oxidant. If it is wet with water, it can be easily converted into iron sulfate. The crop cannot be absorbed. Poor fertilizer, the most vulnerable to failure.

6. Insufficient fertilizers can not be used

The activity of the bacteria in the biological fertilizer is limited by time. The bacterial fertilizer standard stipulates that the standard period of the strain should be valid on the packaging bag. Under normal storage conditions, the validity period is up to two years.

Microbial fertilizer expires and cannot be used. The bacterial fertilizer must be stored at a low temperature (optimal temperature 4 ° C -10 ° C), cool, ventilated, and protected from light to avoid failure.


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