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| DOI：10.13522/j.cnki.ggps.20190082 |
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| Rational Water Storage Depth in the Paddy Field during Tillering Stage of Mid-season Hybrid Rice in Different Cultivation Ways |
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XIE Chunjiao, ZHU Jianqiang, WU Qixia, QIAO Yue, LIU Kaiwen
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1.Hubei Provincial Key Laboratory of Waterlogging Disaster and Wetland Agriculture, Jingzhou 434025, China；2. Jingzhou Agro-meteorology Experimental Station of, Jingzhou 434025, China
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| Abstract: |
| 【Objective】 There are more rainfalls in the plain lake area of Hubei from June to July, and it is very important to make reasonable use of rainfall resources to determine water storage depth(WSD) in the field after raining. 【Method】 Combined with the actual production of the lake plain in Hubei Plain, the pit test of different water storage depths (4 cm, 8 cm, 12 cm and 16 cm) was carried out in the middle rice tillering stage for the simulating machine transplanting rice(SMTR) and the direct seeding rice(DSR). 【Result】 Under the water storage depth studied in this experiment, when the SMTR depth was 4 cm and the DSR depth was 8 cm, the photosynthetic rate of rice leaves was the highest, the SPAD value was the largest, and the dry weight of roots was the highest in 10~20 cm soil layer , the highest yield. The grain yield of SMTR under the treatments of WSD in 8 cm, 12 cm and 16 cm reduce by separately 3.75%, 9.49% and 11.97%; for direct seeding rice, the grain yield of treatments of WSD in 4 cm, 12 cm and 16 cm reduce by separately 5.03%, 12.87% and 16.45% with contrast to the treatment of WSD in 8 cm. 【Conclusion】 Under the water storage depth studied in this experiment, suitable water storage depth was 4 cm for SMTR and 8 cm for DSR. When the poor drainage of the farmland caused by the heavy rain in tillering stage, the maximum water storage limit of the SMTR was 16 cm, and the upper limit of the WSD storage capacity was 12 cm. |
| Key words: machine transplanting rice; direct seeding rice; photosynthetic characteristics; root distribution; water storage depth |
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