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NPK stands for the initials of the essential chemical elements that make up plant fertilisers.
N – Nitrogen-- 叶子,植株
P – Phosphorous---发芽,根系
K – Potassium----花,果
They are vital for healthy plant growth, but not always readily available in the
soil. Some soils are deficient in one or more element and need some extra help, and certain plants require exceptionally high levels of an element.
To make the most of your plants, there’s a range of NPK fertilisers available with different ratios of each element. This means you can tailor the fertiliser to the specific needs of your garden, saving time and money.
The percentage levels of each element present in the fertiliser are indicated by three numbers, representing the N-P-K in that order.
For instance, a balanced fertiliser for general purpose usage will read 5-5-5, which is an equal 5% of each element. A high nitrogen fertiliser would be shown as 12-5-5, and high potassium would be 5-5-12.
Nitrogen is needed to produce leaves, stems and vegetation growth, so high nitrogen fertiliser is best for lawns and leafy
vegetables.
Phosphorus is essential for seed germination and for young plants to develop good root growth. Root vegetables such as swede,
carrots and turnips need a high phosphorous fertiliser.
Potassium, sometimes referred to as potash, is essential for flower and fruit growth and also helps plants fight disease. For fruiting and flowering plants, look for a fertiliser with high potassium and low nitrogen levels. This will encourage fruit and flowers without promoting too much leaf growth.