豫南稻区不同播期对再生稻生长发育及产量的影响

Effects of Different Sowing Dates on Growth and Yield of Ratooning Rice in the South of Henan Province

为确定豫南稻区再生稻的最佳播种时间,对在不同播期处理情况下的水稻生育进程、秧苗素质、头季稻产量和再生稻产量等进行比较分析。结果表明：在当年（2014）气候条件下,采取小拱棚旱育秧方式,除2月21日播种的秧苗生长发育受到影响外,3月1日~4月11日播种的处理,均能培育出正常的秧苗,且在此时间段内,头季稻的熟期随播期的推迟而推迟,再生稻的产量则随播期的推迟而下降,以3月11日播种的处理头季稻产量最高,而两季总产量则以3月1日播种的最高。由此,本试验认为豫南稻区再生稻的最适播期应在3月上中旬。

In order to determine the optimum sowing date of ratooning rice in south of Henan Province, the growth process,seedling quality,yields of main crop and its ratooning rice were compared and analyzed. The results showed that under the climatic conditions of 2014,the rice seedlings sowed on March 1 to April 11 could grow normally through dry nursery in a small plastic shed,except that sowed on February 21.Sowed dur-ing this period,the maturity of main crop delayed and the yield of ratooning rice declined with the postponing of sowing date.The yield of main crop rice was the highest when sowed on March 11,and the total production of main crop and ratooning rice reached the peak when sowed on March 1.Therefore,the early and middle March was identified as the optimum sowing period for ratooning rice in south area of Henan Province .