BENEFITS FROM USING OF UREA TREATED WITH NITRIFICATION INHYBITOR 3(5)-METHYLPIRAZOLE TO MANAGE N ON CORN

Ira Valeriivna Loginova, Mykola Mykhailovych Gorodniy

Abstract


The influence of nitrification inhibitor (NI) 3(5)-methylpirazole on soil nitrogen transformation, growth, development, and yield of corn (Zea mays L.) grain were studied. A 4-year study was conducted on loamy-chernozemic calcareous soil in Forest Steppe zone of Ukraine. The eight treatments included urea fertilizer (90 and 135 kg/ha) with and without nitrification inhibitor (in dosages 0.5, 1.5 and 2.5% to nitrogen), surface broadcasted before planting, and an unfertilized control. Urea was applied along with phosphate and potassium fertilizers. It was found, that application of urea with nitrification inhibitor negatively influenced growth of nitrifiers in the soil. This fact leads to changes in soil nitrogen transformation decreasing amount of nitrates and increasing the concentration of ammonium nitrogen. Improvement of soil nitrogen regime influenced positively corn plants nutrition and allowed to increase the fertilizer N-use efficiency. As a result it was harvested additionally on average 0.5-1.0 t/ha (5-10%) of the corn grain. No sufficient influence on grain quality was mentioned. In lysimeter study conducted on soddy-podzolic sandy soil NI decreased nitrate leaching and promoted the increase of corn silage yield.


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