Effect of increasing nitrogen, phosphorus and potassium doses on the yields of cultivated plants
1985
Wilk, K. | Rabikowska, B. (Akademia Rolnicza, Wroclaw (Poland). Katedra Chemii Rolniczej)
Field experiments were carried out on soils of good wheat complex rich in soluble phosphorus and potassium compounds. The yields in cereal units were with N1P1K1 (177 kg NPK/ha) by 21%, with N2P2K2 by 39%, and with N3P3K3 by 43% higher than the control yield (without fertilization). The mean effectiveness of 1 kg NPK for the dose 177 kg NPK/ha - 3.5, and for the dose increased from 354 to 531 kg NPK/ha-0.09 kg of cereal units. The increasing and superimposed doses of NPK fertilizers in the period of seven-year rotation increased the content of total and protein nitrogen in the yields of plants, but in most cases they had no effect on increase of phosphorus, potassium and magnesium contents. (Author)
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