Abstract:

Under the atmospheric phenomena of high temperature and summer drought condition in the south-east districts of Sichuan province, the percentage of productive panicle were very low and the grain filling rate was very poor of rice, so the difficulty of rice grain yield were further increased be very high. In this treatise, eighteen hybrid rice combinations were used to study the cultivation strategy and its technology of hybrid mid-season rice for further high yield in winter water-logged field. Due to the very poor sunlight condition in the eastern and southern districts of Sichuan province, a high yield cultivation strategy of hybrid mid-season rice with super sparse cultivation was used to decrease the number of top tillers, improve sunlight condition of population, raise the percentage of productive panicle, moderately decrease the number of productive panicles, significantly increase spikelets per panicle, so that the sink was increased with the leaf area index of high yield. With raising the level of nitrogen application photosynthesis source was replenished to maintain normal grain filling under high grain-leaf ratio. The key cultivation technology was a planting density of 9×10⁴ hill ha^-1 and a total of 210 kg ha^-1 N application during the entire growth period, by which the yield was increased by 11.86%–18.31% and 14.32%–17.76% compared with traditional cultivation (CK) in the productive demonstration in 2004 and 2005, the highest yield in some plots reached to 10.81–11.05 t ha^-1.

Key words: Winter water-logged field, Hybrid mid-season rice, High yield, Cultivation strategy