ESTABLISHING SOWING DENSITY AND OPTIMAL DOSAGE OF FERTILIZER FOR INCREASING PRODUCTION OF WINTER WHEAT AND BARLEY, UNDER CLIMATE CHANGE CONDITIONS.

Polifactorial experience was located in North Baragan Plain, and experimental factors were: - sowing density, with three graduations (450 gs/sqm; 550 gs/sqm; 650 gs/sqm); - type and dose of fertilizer (chemical - NH4NO3 and urea, biological - AgroArgentum - 2 doses, and unfertilized). By carrying out chemical analyses of the soil before and after application of chemical and biological fertilizers in different vegetation phases, we established the dynamics of nutrients for every variant of fertilization, compared to unfertilized control. Compared with the control, has revealed a different dynamics of nitrogen in the soil, fertilized variants biological nitrogen supply being weaker than the control but in a continued increase from April to June. Instead, chemically fertilized variants were well supplied with nitrogen, but in a continuous decline, reaching as June have lower values than the control, especially variant fertilized with urea. Biological fertilisation with AgroArgentum Forte 100 ml/ha obtained differences significant positive compared to the average experience were obtained at densities between 550 and 650 gs/sqm variety Boema, with 1291 kg/ha and 1135 kg/ha more than control. Barley were recorded positive differences from the average experience (6421 kg/ha) only to versions with sowing densities 550 and 650 gs/sqm, chemically fertilized, the biggest positive difference is the variant 650 gs / sqm ammonium nitrate 150 kg/ha, with a difference of 1321 kg/ha, followed by variant 450 gs/sqm, AgroArgentum Forte 100 ml/ha) with a difference of 1004 kg/ha compared to the average experience. [ABSTRACT FROM AUTHOR]