Fertiliser 101: Potassium

Screen Shot 2014-01-01 at 8.13.46 pmSo we’ve discussed nitrogen and phosphate, but what about the other common element of commercial fertiliser – potassium?

Plants need potassium to help them with photosynthesis, to fight diseases and to grow well. Fruit and vegetables need plenty of potassium to help them build sugars and starches. Signs of inadequate potassium include low fruit yield (especially tomatoes) and scorched leaves, as well as low resistance to diseases.



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