Different Rice Straw Returning Patterns: The Effects on Yield and Freezing Injury of Winter Wheat

doi:10.11924/j.issn.1000-6850.casb16110117

Abstract

Abstract: To comprehensively evaluate rice straw returning effects on winter wheat yield and its freezing injury, Five straw returning patterns were conducted, including no straw returning (control), straw returning by mulching (SRM), straw returning on wide row by mulching(SRWM), straw returning by shallow-tillage(SRST) and straw returning by deep-tillage(SRDT). The characteristics of growth development of wheat and its yield under different straw retuning patterns and their response for low temperature were analyzed. The results showed that, compared with control, the number of seedling, number of tillers and dry matter accumulation after heading (DMAH)of wheat were significantly decreased under SRM and SRST, and their yield were reduced by 21.3% and 17.3%. On the contrary, there were no significant difference, and even more seedlings, tillers and DMAH under SRWM and SRDT, and their yield were increased by 8.0% and 5.3%. In addition, there were not only worse qualities of single wheat seedling (tiller number, fresh weight and dry weight), but also more seedlings with freezing injury and higher percentage under SRM and SRST. By correlation analysis, the number of seedling with injury was significantly and negatively correlated with the qualities of single wheat seedling. The results indicated that SRM and SRDT could improve the growth development and grain yield of winter wheat and relieve its freezing injury .

CLC Number:

S314

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