| Annual variation of rainfall and crop water requirements of ratoon rice during the sprouting of axillary bud period |
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| DOI：10.7606/j.issn.1000-7601.2016.03.10 |
| Key Words: ratoon rice sprouting of axillary bud precipitation crop water requirement annual variation |
| Author Name | Affiliation | | XIE Yuan-quan | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China | | DU Kang | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China | | LIN Zhao-miao | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China | | LIU Zheng-hui | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing, Jiangsu 210095, China | | WANG Shao-hua | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China | | DING Yan-feng | Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing, Jiangsu 210095, China |
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| Abstract: |
| Based on the daily data at six meteorological stations including Suining, Neijiang, Luzhou, Yibin, Naxi and Xuyong during 1951—2007, the FAO Penman-Monteith formula and the method of crop coefficient calculation were used to estimate the water requirements for ratoon rice during the period of sprouting of axillary bud (from late July to mid-August) and the regional disparity and temporal distribution characteristics of precipitation and crop water requirement during this period were also explored. The results showed that the mean annual precipitation during sprouting of axillary bud were 156.7, 175.4, 168.5, 66.7, 227.5 mm and 153.4 mm, and annual crop water requirement were 141.5, 138.6, 144.5, 146.0, 128.5 mm and 142.7 mm for Suining, Neijiang, Luzhou, Yibin, Naxi and Xuyong, respectively. In consideration the relationship between rainfall and the crop water requirement, Yibin, Neijiang, Luzhou and Xuyong are suitable for ratoon rice, while Naxi is not. Temporal distribution of precipitation and crop water requirement during the period of sprouting of axillary bud was evaluated by calculating the ratio of rainfall (R) to ETc. For Neijiang, 63% of the years from 1951 to 2007 had a R/ETc ratio above 1.0, and 12% were below 0.5. For Luzhou, 52% of the years were above 1.0, whereas 4% were below 0.5. In conclusion, Neijiang is vulnerable to drought stress during the sprouting of axillary period. The ecological regionalization of ratoon rice in southeast Sichuan is interpreted as a result. Yibin, Neijiang, Luzhou and Xuyong can dry paddy field at full heading stage, while Naxi cannot. |
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