Cultivation technology elements influence on the spring rape crops pollution in the Northern Kazakhstan conditions

The purpose of research is to study the influence of elements of cultivation technology on the infestation of varieties and hybrids of spring rapeseed. Objectives: to analyze the influence of the elements of spring rapeseed cultivation technology on the contamination of crops. The study was carried out on the basis of the Esil State Variety Testing Plot located in the village of Yavlenka, the Esil District, the Northern Kazakhstan Region of the Republic of Kazakhstan in the period from 2019 to 2021. The following varieties were included in the study: Yubileiny, Geros, Maikudyk, Hunter, Makhaon, and Kalibr hybrids, Bilder, GEN0009. The study of varieties and hybrids was carried out against the background of two predecessors - bare fallow and spring wheat, according to several seeding rates - 2; 2.5 and 3 million viable seeds. The infestation of crops was determined per 1 m2 of each variant in 4 replications before herbicide treatment, one month after herbicide treatment (quantitative method in the field) and 14 days before harvesting (quantitative-weight method). Elements of cultivation technology have a significant impact on the weediness of crops, and also indicate the prospects for cultivation for seeds of the Maikudyk variety and the Bilder hybrid according to its predecessor - pure fallow with a seeding rate of 2 million viable seeds, which were noted with positive dynamics. Weed infestation of rapeseed crops for pure fallow was less than for spring wheat, the crops of Maykudyk variety (12.2 pcs/m2) and Bilder hybrid (11.8 pcs/m2) were the cleanest. According to the seeding rates, rapeseed crops with a seeding rate of 2.5-3 million germinating seeds were distinguished by less weediness, the Maykudyk variety (11.0 pcs/m2) and the Bilder hybrid (10.6 pcs/m2) had the least weediness.