IMPROVED TECHNOLOGY OF CARROT CULTIVATION UNDER DRIP IRRIGATION

The article considers technologies of carrot cultivation of Shantene Korolevskaya hybrid under irrigation conditions on light chestnut soils of the Lower Volga region. Against the background of various methods of tillage, modern methods of using water-soluble fertilizers have been studied. It was found that deep chisel plowing with 0.18-0.20 m soil overturning results in 1.25 fold increase in productivity of edible carrot compared to moldboard plowing and blade cultivation. Using water-soluble fertilizer NS 30:7 through fertigation increases productivity by 7% compared with ammonium nitrate. Measurements of soil density showed that carrot yield averaged 1.25-1.32 t/m3 over 2015-2017. In variants after deep chisel plowing rate of water infiltration during all three research years was the highest and averaged 4.2 mm/min. The smallest water infiltration was observed in variants after blade cultivation. Using ammonia nitrate during fertigation in 1-4 applications and NS 30:7 fertilizer in 5-8 applications, and NS 30:7 fertilizer during all 8 applications increased carrot yield of hybrid Shantene Korolevskaya by 4.7-5.9 and 0.5-2.4 t/ha compared to control. In addition, combination of deep chisel plowing with ammonium nitrate fertigation in 1-4 applications and NS 30:7 fertilizer in 5-8 applications resulted in the highest carrot yield in 2015-2017 and averaged 90.6 t/ha. The lowest carrot yield over 2015-2017 was observed in the variant after blade cultivation with ammonium nitrate fertigation and amounted to 77.5 t/ha.