Product : Ammonium Sulphate Total Nitrogen: 21% Sulfur content： 24% FORMULATION: (NH4) 2SO4 WATER SOLUBILITY: 70.6g at 0 ℃, 103.8g at 100 ℃ RELATIVE DENSITY: 1.77g/cm3 PH(0.1mol/L): 5.5 PURITY : 99% REFRACTIVE INDEX: 1.521 MOLECULAR MASS: 132.14 Standard:according to destination port policy Application： 1.used as a base fertilizer for crops: Ammonium sulphate as a base fertilizer should be applied deeply to cover the soil to facilitate crop absorption. 2.used as a crop fertilizer: Ammonium sulphate is most suitable for use as a fertilizer for the crop. Need to determine the amount of this fertilizer according to different soil types. For poor water and fertilizer retention performance of the soil, to be applied in stages, each dosage should not be too much; for good water and fertilizer retention performance of the soil, each dosage can be appropriate more. How much soil moisture also has a greater impact on the effectiveness of fertilizer, especially dry land, the application of this product must pay attention to timely watering. As for flooded fields for fertilizer, it should be drained and dried first, and attention should be paid to combine with the application of tillage at the same time. In addition, there are obvious differences in the application of this fertilizer for different crops, such as for fruit trees, can be applied in furrow strips, ring or hole. 3.can be used as a seed fertilizer when planting crops: Because Ammonium sulphate has no adverse effect on seed germination. Caution: 1.This fertilizer should not be applied in contact or mixed with other alkaline fertilizers or alkaline substances to prevent the reduction of fertilizer efficiency. 2.Should not apply this product on the same piece of arable land for a long time, otherwise the soil will become acidic and cause caking. If you really need to apply, you can apply some lime or organic fertilizer with the appropriate amount. But must pay attention to this product and lime can not be mixed, to prevent the decomposition of this product, resulting in nitrogen loss. Generally the two with the application of 3-5 days apart. 3.This product is not suitable for application on acidic soil.