The best crop production technology depends on the approved scientific approaches and agricultural practices. Studying the elements of crop production technology is necessary to obtain stable and highquality yields. The result’s reliability reached validity from three years of field and laboratory studies conducted under typical conditions per modern methods and state standards. For the presented research, the spring wheat cultivated as the first crop of different fallow types began during 2020–2022 at the Kursabaev Farm, North Kazakhstan. The spring rapeseed cultivars and hybrids, planted on bare fallow soil, had various seeding rates in 2019–2021 at the Yessil Yessil State Grain Feed Variety Testing site in North Kazakhstan. The study showed that for 2020–2022, the highest spring wheat grain yield resulted in the variant with chemical fallow treatment. The highest grain yield in rapeseed surfaced from the bare fallow soil with cultivar ‘Maikudyk’ and the hybrid ‘Builder,’ with a seeding rate of 2.0 million seeds per hectare. The results revealed that fallow preceding a crop contributes to a better spring wheat harvest. Thus, this work allows for determining the most effective ways to increase crop yields under climate change and variations in other environmental factors.
Spring wheat, spring rapeseed, seeding rate, chemical fallow, bare fallow, grain yield
As part of the study, in the conditions of the Zhambyl District of the North Kazakhstan Region in 2020–2022, the highest spring wheat yield occurred using chemical fallow treatment preceding a crop, with tillage of 16–18 cm. Treatment with bare and sown fallow showed lower efficiency with a difference of 0.19–0.42 t/ha. The highest spring rapeseed yield in the Esil District of the North Kazakhstan Region in 2019–2021 appeared at the seeding rate of 2.0 million germinating seeds per hectare in cultivar Maikudyk, while the increased seeding rate showed a decline in crop yield in 2019–2021.