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| Rice quality and nitrogen use efficiency under long-term application of pig manure or biogas slurry |
| Received:September 06, 2021 |
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| KeyWord:pig manure;biogas slurry;rice;grain yield;rice quality;nitrogen use efficiency |
| Author Name | Affiliation | E-mail | | SUN Guofeng | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences, Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | WANG Xin | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences, Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | SHENG Jing | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences, Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | nkysj@hotmail.com | | ZHANG Liping | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences, Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | WANG Zichen | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences, Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | ZHOU Wei | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences, Key Laboratory for Crop and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | |
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| Abstract: |
| This study determined the long-term cumulative effects of equal-nitrogen manure replacement using a chemical fertilizer(CF) on rice yield, rice quality, and nitrogen use efficiency(NUE). Based on a long-term field experiment, two types of manure[pig manure(PM) and biogas slurry(BS)] and two nitrogen replacement ratios(50% and 100%)were selected to study the rice yield, rice quality, and nitrogen absorption and utilization in the eighth and ninth years. The results showed that there was no significant difference in the rice yield among the equal-nitrogen PM, BS, and CF treatment. Compared with the CF treatment, the PM and BS treatments increased the head rice rate and taste value of rice, which were helpful to improve the eating quality of rice, mainly because the protein content of rice was reduced. The PM treatment reduced the chalky kernel rate and chalkiness degree of rice, which were beneficial to improve the appearance quality of rice. The appearance quality of rice was unaffected by the BS treatment. The NUE of rice showed the rule of BS > CF > PM treatment, and there were significant negative correlations between the NUE and nitrogen physiological efficiency, and NUE and rice gel consistency. The average annual NUE of the BS treatment was 41.9%~44.0%, which exceeded the average annual NUE of the CF treatment(40.7%), mainly due to the increase in the nitrogen content of rice straw. However, compared with the CF treatment, the NUE of the 50% BS, 100% BS, and 50% PM treatment were not significantly different, whereas the 100% PM treatment significantly reduced the NUE. Overall, under the conditions of this experiment, the PM and BS treatments could improve the eating quality of rice. The 50% PM, 50% BS, and 100% BS treatments had little effect on the rice yield and NUE, whereas the 100% PM could significantly reduce the NUE of rice. |
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