自然极度干旱条件下胡麻品种不同播种期的二次生长表现

在自然极度干旱条件下,胡麻不同品种、不同播种期均可发生二次生长,但发生程度有很大差异。播种期与胡麻二次生长率及二次生长指数存在较高的相关性,随播种期提前,胡麻不同品种的二次生长率及二次生长指数均呈规律性递增。品种之间的二次生长也有很大差异,其中坝选三号对干旱反应敏感,二次生长率及二次生长指数最高,坝亚七号次之,坝亚十二号最低。同一品种随播种期的提前,单株二次生长经济性状(二次分枝数、二次蒴果数、二次果粒数、单株二次粒重)表现越高,说明胡麻提前播种比晚播种单株二次生长发育充分,不同品种有着一致的规律。

Performance of Secondary Growth of Oil Flax Varieties Sowed in Different Times under Extreme Drought Conditions

The secondary growth of different oil flax varieties sowed in different times may appear under the extreme drought conditions, while the difference was great. The correlations between sowing time and secondary growth rate and index were relatively high. The secondary growth rate and index increased with the advance of sowing time. The differences among varieties were significant. Baxuan No. 3 was sensitive to drought, whose secondary growth rate and index were the highest, Baya No. 7 took second place and Baya No. 12 was the lowest. As the same variety, the economic characters of secondary growth including numbers of secondary branches, capsules and fruits and secondary seed weight per plant increased with the advance of sowing time, that was to say, the secondary growth was full. Different varieties had the consistent change rule.