Abstract
To understand the effect of covering on soil temperature,rapeseed cold resistance and yield in Huang- Huai Area,Brassica napus L. cv Fengyou 10 was used in field experiments during 2009 and 2012. Two coverings as straw cover on surface and soil cover on root crown were designed before and after winter. Temperature at different soil layers,cold damage level,economic traits,yield and quality were investigated with no covering as control. Results showed that straw cover before winter significantly improved the soil temperature and reduced the freezing index,and consequently improved survival rate. Freezing index under both straw- covering treatments were significantly lower than control,and yields were significantly higher( with 1. 55% to 58. 28% increase) than control,especially with the covering applied before winter. The yield increase was due to significant increase of effective pods number and thousand- seed weight. Their increases were 4. 48% to 20. 39%,and 29. 97% to 41. 11% respectively. No significant change of seed quality was found. This study proved that covering both with straw and soil could benefit the rapeseed yield and cold resistance in Huang- Huai Area,especially before winter.
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