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Effects of Returning Straw into Field on Next Year Winter Wheat Root System Development and Leaf Senescence

GAO Mao-sheng,LIAO Yun-cheng*,YIN Zhen-yan,YU Xi-shui,WU Qing-li(College of Agronomy,Northwest Sci-Tech University of Agriculture and Forestry,Yangling,Shaanxi 712100,China)  
The experiment was conducted to study the effects of returning wheat straw into field on the wheat root system development,the chlorophyll content of leaves(Chl),the malondialdehyde content(MDA) and photosynthesis rate in the next year.The results showed that(1) with the treatment of returning straw into field,wheat root system's growth,distribution in the in-depth soil can remarkably be enhanced;(2)The chlorophyll content of winter wheat leaf was increased with the increase of the returning straw quantity.However,at the later filling period,the chlorophyll content in leaves went to drop and the descent rates were significantly different among the various treatments.The slowest chlorophyll content descent rate and the highest photosynthesis rate were all the same one with treatment Ⅲ;(3)Among the malondialdehyde content in flag leaves,the one with treatment Ⅲ was also the lowest.The negative correlation between MDA and photosynthesis rate was confirmed.As the results,the best treatment should be returning 6 000 kg straw per hectare into the field.
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