The effect of sowing time and sowing rate on the duration of developmental phases and growth period of rice varieties

Abstract Today, with the world’s growing population, global climate change, rising temperatures, increasing rainfall in some areas, and contrarily, severe droughts it is becoming increasingly difficult to grow abundant high-quality farming crops. This means that issue of food security will become more complicated future. One priorities solving this problem modernize agricultural sector by using intensive agro-technologies cultivation products. Due fact length day climatic conditions our country different, very short cold winter, hot extremely long summer, paddy naturally adapted spring planting ripening autumn (to make offspring). In second half April, when rice begins, around 13,5 hours, longest being 15,1 hours on June 20-22 12,5 mid-September harvested.