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| Short-term effect of precision agriculture on winter wheat yield and greenhouse gas emissions in the North China Plain |
| Received:November 05, 2018 |
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| KeyWord:precision fertilization;laser land leveling;winter wheat;greenhouse gas emissions |
| Author Name | Affiliation | E-mail | | LU Chuang | Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China | | | WANG Yong-sheng | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | HU Hai-tang | Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China | | | DONG Xi | Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China | | | LI Cun-jun | Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China | licj@nercita.org.cn |
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| Abstract: |
| A field experiment was conducted in suburban areas of Beijing. The effect of four treatments, namely conventional tillage and fertilization(CTF), precision fertilization(PF)alone at the topdressing stage, laser land leveling(LL)alone prior to sowing, and a combination of PF+LL, on CO2, N2O, and CH4 emissions were examined. The results showed that LL significantly increased the wheat yield by 7.10% compared with CTF, and surface soil moisture content was significantly improved. Regarding greenhouse gas emissions, the amount of CH 4 absorbed by soil was significantly increased by 22.00%, but CO2 and N2O emission fluxes were increased by 27.20% and 8.81%, respectively. Compared with CTF, PF had no effect on wheat yield. The peak value of N2O emissions emerged after topdressing and significantly decreased by 15.41%. The emission fluxes of N2O between the topdressing stage and harvest stage were significantly decreased by 15.05%. However, in the entire season of winter wheat, there were no differences in emissions of CO2, N2O, and CH4 found between PF and CTF. PF+LL significantly increased the wheat yield by 8.20% compared with CTF, and the water holding capacity of soil was enhanced, as the water content was significantly increased by 8.81% and 7.63% in the rainy season and irrigation season, respectively. The cumulative emissions of CO2 were significantly decreased by 33.53%. The absorbed amount of CH4 was significantly decreased by 31.50%. PF+LL also had no effect on the cumulative emissions of N2O in the entire season of winter wheat, but it significantly decreased the N2O emissions between the topdressing stage and harvest stage. In summary, LL could significantly increase the winter wheat yield, but it also increased the global warming potential. PF had no significant effect on wheat yield, but it decreased the peak value of N2O emissions, thereby showing the potential to reduce N2O emissions. In conclusion, the prospects of precision agriculture technology in increasing production and reducing emissions need to be further studied. |
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