关键词: 优质稻, 新源占, 播种期, 密度, 产量, 米质, 豫南地区

Abstract: In order to explore the suitable sowing time and planting density of high quality rice Xinyuanzhan in the south of Henan province, three sowing dates （April 5, April 28 and May 20） and three planting densities（33 cm×12 cm,33 cm×14 cm and 33 cm×16 cm） were set. The effects of different sowing dates and planting densities on yield composition and rice quality were studied. The results showed that when sowing date was delayed, the whole growth period of rice was shortened, the duration from sowing to jointing decreased, while the duration from jointing to heading and heading to maturity did not changed much,and effective panicles decreased, grain number per panicle increased, seed setting rate decreased, 1 000-grain weight changed little, and yield decreased gradually, quality of rice appearance and processing were improved. With the decrease of planting density, the effective panicle and seed setting rate decreased, the number of grains per panicle increased, the number of spikelets decreased, the yield decreased with the decrease of density, but the appearance quality and processing quality of rice improved. According to the two factors of yield and rice quality density, when Xinyuanzhan is planting as a kind of medium rice in the south of Henan province, it should be sown on April 28 with a planting density of 33 cm×12 cm.

Key words: high quality rice, Xinyuanzhan, sowing date, density, production, the quality of rice, the south of Henan province