Technically known as Sulphate of Potash, SOP is a speciality fertiliser that contains potash, enriched with sulphur. The sulphur helps improve produce quality and imparts flavour. It also helps in increasing the crop's resistance to insect and disease attack and moisture stress. SOP helps in improving sugar content in fruits, size, quality etc. This fertiliser helps in hastening maturity and is chlorine free. The ideal dosage of this fertiliser is 7 - 10 gm / litre of water, sprayed two to three times at an interval of eight days.