Nitrate content in onion as affected by different forms of phosphorus and potassium fertilizers
1996
Ulatowska, D. | Zawartka, L. (Akademia Rolniczo-Techniczna, Olsztyn (Poland). Katedra Chemii Rolnej)
In 3-year field experiment the effect of multicomponent NPK and NPKMg fertilizers on onion yield and contents of nitrates and total N was studied. NPKMg and crystalline NPK fertilizers increased total N content in onion. New granular NPK and NPKMg fertilizers significantly reduced nitrate content in comparison to fertilizing with superphosphate + potassium sulphate + magnesium sulphate or superphosphate + potassium sulphate. The lowest nitrate level in the total N was observed in onion fertilized with granular NPKMg and NPK what may suggest good N utilization by the plant
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