福建省感光型杂交稻生育期表现及分析

福建省感光型品种表现播种期弹性大,播种期早全生育期长,播种期迟全生育期短；闽西北中低海拔稻区,可4月中旬至6月上旬播种,福州沿海稻区最迟可在7月初播种,但都在9月至10月初齐穗,齐穗期相对稳定.在海拔400m以下,不同高度的齐穗期差异不显著.与汕优70感光性强度相当的杂交稻组合种植区域:闽东南南亚热带双季稻区、海拔60...

Growth Performance of Photosensitive Hybrid Rice in Fujian

In Fujian,the photosensitive hybrid rice varieties usually are flexible on the date for sowing.Their growth periods last long allowing the rice be sowed late in the season and still mature enough for harvest before the cold weather sets in.For instance,in the middle to low altitude northwest regions of Fujian,the photosensitive rices can be sowed from mid-April till mid-June.And,in the Fujian coastal rice planting areas,the sowing date can be as late as early July and still reach full heading in September to early October.Below the altitude of 400 m,there are little differences for their growth.In the planting areas for the hybrid rice cultivars similar to Shanyou 70 and the double-harvest subtropical regions or the temporate zone under 600 m altitude in southeastern Fujian,the photosensitive varieties can reach the full heading around early October,as long as they are sowed by mid to late June.When sowed at the same time in the northwest subtropical land or wet land or in the single/double-harvest areas below 400 m,they could only be expected to safely reach a full heading before September 25.On the other hand,in the middle of Fujian northwest region where the mountain climate preveals,the temporate area,wet land and single-harvest cooler areas,the hybrid rice could not reach a full heading and was not considered adequate for its planting.In order to guarantee a safe full heading,it was therefore necessary to breed hybrids suitable for that and wider regions with a full heading date a week earlier than Shanyou 70,in addtion to high lodging-and disease resistance,superior quality and high yield.