(1) As a base fertilizer. When ammonium sulfate is used as the base fertilizer, the soil should be applied deeply to facilitate the absorption of the crop.
(2) for topdressing. This is the most suitable method of application. The amount of topdressing ammonium sulfate was determined according to different soil types. For soils with poor water retention and fertilizer retention performance, it should be applied in stages, and the dosage should not be too much. For soils with good water retention and fertilizer retention, the dosage should be more appropriate. The amount of soil moisture also has a greater impact on fertilizer efficiency, especially in dry land. When applying ammonium sulfate, it is necessary to pay attention to timely watering. As for the paddy field for topdressing, it should be drained and dried first, and attention should be paid to the combination of tillage and application. In addition, there are also significant differences in the application of ammonium sulfate to different crops. For example, when used in fruit trees, it can be applied by ditching, ring application or acupoint application.
(3) It is more suitable for seed fertilizer. Because ammonium sulfate has no adverse effects on seed germination.
The following problems should be noted when applying ammonium sulfate: (1) Ammonium sulfate fertilizer should not be contacted or mixed with other alkaline fertilizers or alkaline substances to prevent reducing fertilizer efficiency. (2) It is not advisable to apply ammonium sulfate for a long time on the same piece of cultivated land, otherwise the soil will become sour and cause compaction. If it is necessary to apply, some lime or organic fertilizer can be applied in an appropriate amount. However, it must be noted that ammonium sulfate and lime cannot be mixed to prevent decomposition of ammonium sulfate and cause nitrogen loss. Generally, the combined application of the two should be separated by 3 to 5 days. (3) Ammonium sulfate is not suitable for application on acidic soils.
Ammonium sulfate application method and precautions
Ammonium sulfate [(NH4)2SO4], also known as ammonium sulfate, is one of the earliest nitrogen fertilizers produced and used at home and abroad. It is usually regarded as a standard nitrogen fertilizer with a nitrogen content between 20% and 21%. The pure ammonium sulfate is white crystal, and the by-product is yellowish or gray, which has low hygroscopicity and is not easy to agglomerate, so it is easy to store and is more soluble in water. Ammonium sulfate is a physiological acid quick-acting nitrogen fertilizer, which is generally suitable for crops such as wheat, corn, rice, cotton, sweet potato, hemp, fruit trees and vegetables. For soils, ammonium sulphate is best suited for neutral and alkaline soils and not for acidic soils. There are mainly the following methods for applying ammonium sulfate:
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