STUDY OF THE EFFECT OF FERTILIZATION AND SOWING RATES ON THE YIELD CAPACITY OF DENI DURUM WHEAT

At the Experimental and Implementation Base of the Agricultural University of Plovdiv, Bulgaria, a field experiment was conducted to determine the impact of two factors on the yield of Deni durum wheat. Four levels (N0P0K0; N60P40K0; N120P80K0; N180P120K60/ha) were tested for fertilization rate, being Factor A, and three levels ( 400, 500, 600 germinating seeds per m(2)) were tested for sowing rate, being B. The experiment was performed after the precursor of rapeseed by the method of fractional plots in four repetitions during the period 2015 - 2018. As a result of the experiment, it was proved that: Deni wheat durum wheat shows its yield capacity to the greatest extent under the soil and climatic conditions of Plovdiv region when grown with fertilization rate: N120P80K0 and sowing rate of 500 germinating seeds m(2). Grain yield increased from 3.29 t/ha to 4.75 t/ha or an average of 4.02 t/ha (13.6%) over the three-year experimental period 2015-2018. Structural elements of the yield, i.e. productive bushiness, number of spikelets, number of grains and mass of grains in the wheat-ear have the highest values at fertilization level with N120P80K0 and sowing rate of 500 germinating seeds per m(2).