Wilko sulphate of ammonia 15kg is a plant food which provides a quick boost of the essential nitrogen nutrient required for healthy foliage its easy to apply directly to the soil during the growing season and is particularly suitable for green leafy crops such as cabbage broccoli brussels sprouts cauliflower spinach and lettucecontains fast acting nitrogen for strong green leaf growth and to reverse leaf yellowing chlorosis apply directly onto the soil during the growing season marc