Productivity of sunflower depending on the sowing dates in the Western Kazakhstan

Sunflower cultivation is very important today in climatic conditions of the Western Kazakhstan which are characterized with high heat supply and prolonged vegetative period. Over the last years, sunflower crops in the Western Kazakhstan region exceed 40 thousand ha; however, seeds yield is still low (0.75-1.05 t per ha). So it is very important to develop adaptive cultivation technologies of this crop in order to increase sunflower productivity and extend sowing areas. The general resource of sunflower yield increase together with new highly productive varieties and hybrids is perfection of agrotechnical methods, especially selection of optimal sowing dates. One of the important conditions of adaptive technology of sunflower cultivation is crop sowing in the optimal dates. This determines well-timed simultaneous and full seedling appearance and the further good growth of plants. The purpose of our research was to study elements of the adaptive cultivation technology to provide producers of vegetable oil with qualitative seeds...