Abstract
The purpose of the work is to study the timing of sowing lentils in the southern chernozems of Kostanay region when the optimal temperature regime of the soil is reached, their effect on the contamination of crops and crop yield. The research was carried out in 2021-2022 at the experimental field of «Agricultural Experimental Station «Zarechnoye» LLP (Kostanay region, Republic of Kazakhstan). The experiment studied the timing of sowing lentils – May 22 (control), May 25, May 27, May 31. The predecessor is spring wheat. The technology of tillage is No-till. There is a tendency to decrease the level of contamination of lentil crops in the phase of full germination, as the sowing dates are postponed from early to late. Thus, the total number of weeds during sowing on May 30 is reduced by 5 times compared to the control variant (May 22) – 18.5 pcs/ m2. The growing season of lentils in 2021 was 82-84 days, in 2022 – 80-83 days. On average, the highest yield of lentils was obtained when sowing on May 27 – 11.17 c/ha, which is higher than the control by 1.01 c/ha.
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