npk letters made mineral fertilizers nitrogen phosphorus potassium |
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| navigate by keyword : npk letters made mineral fertilizers nitrogen phosphorus potassium phosphate chemical nitrates growing abstract fertile pellets agriculture ammonia fertilizing urea soil growth pile farmer fertilizer white potash chemistry industrial industry gardening ammonium pellet background fertilize grow complex nutrient agricultural horticulture mix mixed ecology farming granules material land calcium |
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| NPK letters made of mineral fertilizers background. N - nitrogen, P - phosphorus, K - potassium |
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