| Effect of straw returning on soil reducing substance and rice grain yield in gleyed paddy field |
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| DOI：10.7606/j.issn.1000-7601.2014.03.030 |
| Key Words: straw residue rice field gleyed paddy soil reducing substance rice yield |
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| Abstract: |
| The field experiment was carried out at Mianyang, Sichuan province. Redox potential, total reducing substance and Fe2+ content were measured for the soil treated with four levels of straw, with the aim of exploring the relation between soil properties and rice grain yield. Results are shown as follows. As compared with T0 treatment (control), total reduction of soil was increased by 2.2～4.8 cmol·kg-1, Fe2+ content by 10.8～40.8 mg·kg-1, while redox potential decreased by 23.2～96.5 mV, as the amount of straw increased from 2.5 to 10.0 t·hm-2. Rice grain yield was reduced by 1 140～1 560 kg·hm-2. Grain weight decreased by 0.2 g, filled grain rate by 4.2%, when more than 5.0 t·hm-2 was incorporated into the paddy soil. |
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