武陵山区杂交水稻生态适应性的初步研究

A PRELIMINARY STUDY ON BIOLOGICAL ADAPTABILITY OF HYBRID RICE COMBINATIONS IN WULING MOUNTAIN ARFA

本文用4个早条组合早季在凤凰县3个海拔高度的位点种植,初步研究了武陵山区杂交水稻的生态适应性。结果表明:随海拔高升,杂交水稻的生育期延长,特别是灌浆成熟期延长,冠层叶片缩短、变宽、加厚,叶数增加,群体叶面积系数增加,植株变矮,每穗总粒数和每穗实粒数增加,植株变矮,每穗总粒数和每穗实粒数增加,结实率下降,千粒重增加,农艺性状优化,产量提高。高海拔地区不宜选用生育期太长的组合。

The biological adaptbility of the hybrid rice combinations in Wuling Mountains was studied with 4 early-season hylrid rice combinations planted respectively in 3 places of different altitudes in Fenghuang County. The results were as follows: With the altitude rising, the whole growth duration and the grain-filling duration of hybrid rice combinations. lengthened, the top leaves shortened and widthened, the leaf number and leafarea index increased, the total grains and the real grains per spike and the weight of 1000-grains increased, the plant became shor, the seed setting rate decreased, agronomic characters were improved, the yield was raised. Hybrid rice combinations of long growth duration is not suitable for these high altitude areas.