Dependence of productivity of spring rape on seeding rates, time and methods of sowing in conditions of the Northern steppe

Abstract

The purpose. To study efficiency of effect of seeding rate, time and method of sowing on productivity of seeds of spring rape in the Northern steppe. Methods. Field, calculation-mathematical, statistical. Results. Influence on productivity of spring rape is determined of 3 different times of sowing depending on temperature of soil; 5 seeding rates; gutter (15 cm) and wide-row (45 and 60 cm) sowing. Optimum parameters of the investigated factors are fixed. The conducted correlation analysis has displayed that dependence of productivity of spring rape is inverse to all examined factors. Conclusions. Investigated factors essentially influence the level of productivity of spring rape. The optimum time of sowing for deriving maximum yield at gutter sowing is that one when the temperature of soil is 4 — 6°C, the seeding rate should be 2 million seeds for 1 hectare. At wide-row sowing the maximum productivity is gained at seeding rate 1 — 1,5 million seeds for 1 hectare. The third time of sowing is unfavorable and cannot be recommended for growing spring rape.