| Analysis of the causes of wheat harvest index reduction under straw mulching on dryland |
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| DOI：10.7606/j.issn.1000-7601.2014.01.008 |
| Key Words: wheat harvest index straw mulching nitroegn management canopy temperature |
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| Abstract: |
| Based on field experiments and published data, this paper analysed the causes of wheat harvest index reduction under straw mulching in comparison with conventional management on dryland. Generally, many studies showed that straw mulching increased wheat yield.However, the harvest index decreased by 20% for straw mulching as compared with the conventional management. This decrease in harvest index were probably related to: (1) overuse of soil water before anthesis, which resulted in severe water stress during grain filling stage; (2) higher canopy temperature during grain filling stage; (3) leaf senescence and decreased leaf assimialation owing to the only once application of nitrogen fertilizer as basal. However, more work is needed to elucidate the mechanism underlying this reduction in harvest index. |
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