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| Effects of different water and biochar treatments on lodging resistance and yields of rice |
| MIAO Zhiying1, SHAO Guangcheng1*, FANG Kai2, WANG Xiaojun3, MENG Jiajia4,TANG Shuhai5 |
| 1. College of Agricultural Science and Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Water Conservancy Bureau of Suqian, Suqian, Jiangsu 223800; 3. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210029, China; 4. Huaian Water Resources Bureau, Huaian, Jiangsu 223001, China; 5. Lianshui Water Conservancy Research Institute, Huaian, Jiangsu 223400, China |
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Abstract In order to study ways of how to enhance the lodging resistance ability of rice stem, leaching-pond experiment was carried out in Lianshui Water Conservancy Research Institute in 2017. The expe-riment had two irrigation control modes(W1 and W2)and two biochar application levels(B0: no biochar is added; B1: biochar is added with a level of 50 g/kg)to analyze the effects of irrigation regime and biochar amendment on stem characters, lodging resistance and grain yields of rice. The results showed that the application of biochar could improve the agronomic characteristics of rice stem. Compared with B0 treatment, B1 treatment shortened the internode length of rice stem base, and increased its outer diameter and wall thickness.The application of biochar also had significant effects on the cumulative damage energy, bending resistance and bending moment of the rice stem. The lodging resis-tance indexes of the first, second and third internodes of B1 treatment were lower than those of B0 treatment by 34.56%, 31.61% and 26.03% respectively. In addition, there were positive effects of biochar application on the total grains per panicle, seed setting rate, 1 000-grain weight and yield of which the increases of B1 treatment were 5.66%, 6.12%, 2.59% and 12.73%, respectively, compared with those of B0 treatment. Irrigation control treatment had little effect on lodging resis-tance and yields of rice while the irrigation-biochar interaction effect had a remarkable positive influence on the latter. The most stem lodging resistance ability and highest values of yields were realized under the condition of W1 irrigation control and the biochar application B1. In summary,the results indicate that the W1 irrigation control and the biochar application B1 should be an effective planting pattern for improving stalk lod-ging resistance characteristics and yields of rice.This research result can provide effective irrigation-biochar management technology support for rice production in China in the future.
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Received: 25 April 2019
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