Effectiveness of Mineral Fertilization on Corn for Grain, Cultivated in Pellic Vertisol, FAO in Southeastern Bulgaria in Favorable and Risky Meteorological Conditions

V. Koteva, S. Kostadinova, Yo. Popova

Abstract: This investigation was aimed at determining the effect of mineral fertilization on corn for grain, cultivated without irrigation and in years with favorable and risky climate conditions. A 50-year long-term stationary fertilizer trial in Pellic Vertisol (FAO) was analyzed. The effect of the fertilization on the realization of the biological potential of two biotypes corn hybrids was determined in years with sufficient rainfall and water deficit (drought). The economical levels have been calculated, in which the hybrids realize stable long term gains. N-P-K fertilization norms were determined along with soil content with mineral nitrogen, mobile potassium and phosphorus, which reduce the risk of corn cultivation on Pellic Vertisol in Southeastern Bulgaria without irrigation.

Keywords: corn; fertilization effectiveness; meteorological risk; mineral fertilization

Date published: 2017-02-13