不同播期对甜高粱产量和锤度的影响

Effects of Different Sowing Dates on the Yield and Brix of Sweet Sorghum

[目的]分析在天津地区的气候和土壤条件下,不同播期对几个甜高粱品种产量和锤度的影响。[方法]在盐碱土壤上,分期播种5个甜高粱品种,以确定不同播期对甜高粱产量和锤度的影响。[结果]随着播期的延后,甜杂2号、辽甜1号和绿能2号的株高显著降低,早播使甜杂2号、辽甜1号和绿能2号的鲜重显著提高,绿能1号和绿能3号的最适播期出现在5月。除绿能1号外,其余各品种的锤度均随着播期的延后而提高,且5、6月份播种的各品种的植株锤度相差不大。株高和鲜重呈显著相关,相关系数为0.59;株高及鲜重与锤度呈负相关,相关系数分别为-0.43(锤度-株高)和-0.76(锤度-鲜重)。[结论]在北方,尤其是天津地区,甜高粱的最适播期为5月初。

[Objective] The purpose was to analyze the effects of different sowing dates on the yield and brix of several sweet sorghum varieties under climatic and soil condition in Tianjin area.[Method] Five sweet sorghum varieties were sowed into saline alkali soil at different stages to confirm the effects of different sowing dates on the yield and brix of sweet sorghum.[Result] As the sowing date was delayed,the plant heights of Tianza 2,Liaotian 1 and Lvneng 2 were decreased significantly,early sowing significantly enhanced the fresh weights of Tianza 2,Liaotian 1 and Lvneng 2 and the optimum sowing dates of Lvneng 1 and Lvneng 3 occurred in May.As the sowing date was delayed,except for Lvneng 1,the brixes of the rest varieties were enhanced and the plant brixes of varieties sowed in May and Jun.had little difference.The plant height showed significant correlation with fresh weight and their correlation coefficient was 0.59.The plant height and fresh weight showed negative correlation with brix and their correlation coefficients were-0.43（brix-plant height） and-0.76（brix-fresh weight） resp.[Conclusion] The optimum sowing date of sweet sorghum was the beginning of May in north China,especially in Tianjin area.