巴西旱稻中稻栽培生态适应性研究

播种期的安排是水稻生产十分重要的措施.通过对引进的2个巴西旱稻品种(Iapar-9和Tangara)不同播种期的生态适应性研究,探讨了巴西旱稻的最佳播种期.结果表明:Iapar-9和Tangara在长沙地区的适宜播种期为5月10日左右,此时期播种产量最高;2个巴西旱稻品种不同播种期处理LAI和功能叶叶绿素含量变化总的趋势是齐穗期最大,随后逐渐减小;不同播种期处理齐穗期前根系活力差异不显著,齐穗期后根系活力随播种期的延迟而降低,且差异显著;每穗实粒数和结实率低是限制产量的主要原因.

Studies on ecological adaptability of brazil upland rice

The arrangement of sowing stage is a very important step for agricultural production. Comparative experiments on different sowing stages of two Brazil upland rice were applied, the results showed: The best sowing stage of Brazil upland rice was May 10, and the yield was maximal. LAI and chlorophyll of functional leaves in full head stage was maximal among different sowing stages, then them declined along with the aging of vegetation. Root vigorous declined along with the delay of sowing stage after full heading stage, and the difference of root vigorous in full head stage was not significant among different sowing stages, but it was significant in the subsequent stages. The lower of full spikelets per panicle and seed setting rate were the limitative factors on yield.