HORTICULTURE

Detailed explanation-1: -These three numbers represent the primary nutrients (nitrogen(N)-phosphorus(P)-potassium(K)). This label, known as the fertilizer grade, is a national standard. A bag of 10-10-10 fertilizer contains 10 percent nitrogen, 10 percent phosphate and 10 percent potash.

Detailed explanation-2: -Nitrogen, phosphorus and potassium, or NPK, are the “Big 3” primary nutrients in commercial fertilizers. Each of these fundamental nutrients plays a key role in plant nutrition. Nitrogen is considered to be the most important nutrient, and plants absorb more nitrogen than any other element.

Detailed explanation-3: -The three letters, N, P, and K, correspond with three numbers that indicate the percentage of each nutrient in that particular product. For example, a product marked 10-10-10 contains 10 percent nitrogen, 10 percent phosphorus and 10 percent potassium. A bag marked 20-20-20 containers twice as much of each nutrient.