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Fu Z.-Q.,Hunan Agricultural University | Fu Z.-Q.,Key Laboratory of Multi Cropping Cultivation and Farming System | Zhu H.-W.,Hunan Agricultural University | Chen C.,Hunan Agricultural University | And 2 more authors.
Huanjing Kexue/Environmental Science | Year: 2012

Methane and nitrous oxide emission fluxes of rice cultivars in the double cropping rice fields were measured by static chamber-gas chromatography in field experiments. The results showed a single-peak pattern in seasonal variations of methane emission and a double-peak pattern in variations of nitrous oxide emission for the early season rice, and a single-peak pattern in variations of both methane and nitrous oxide emission for the late season rice. There was significant difference among the rice cultivars in the average emission fluxes of methane and nitrous oxide during the whole growing season. The ranges for the methane and nitrous oxide average emission fluxes were 0.58 mg·(m 2·h) -1 and 5.89μg·(m 2·h) -1 for the early-season rice cultivars, and 4.06 mg·(m 2·h) -1 and 5.70μg·(m 2·h) -1 for the late-season rice, respectively. The ranges of GWP (global warming potential) contributed by the amount of greenhouse gases emission and GWP per unit yield of rice cultivars were 2.92 kg·hm -2 and 0.097 kg·kg -1 for the early-season rice cultivars, and 2 256 kg·hm -2 and 0.28 kg·kg -1 for the late-season rice cultivars, respectively. The GWP and GWP per unit yield of rice types were sorted in a descending order: traditional rice>the super hybrid rice>the hybrid rice. For the early season rice, the methane and nitrous oxide emission fluxes of the blank region without rice were 27.1%-31.8% and 33.6%-88.3% of those measured for the region with rice planted, respectively, whereas the corresponding percentages for the late season rice were 23.8%-28.8% and 38.6%-45.3%, respectively. Based on these results, Luliangyou No.819, Jinyou No.402 and Xiangzaoxian No.24 were selected as suitable early-season rice cultivars, whereas Yueyou No.9113 and Xiangwanxian No.12 should be chosen for late-season rice planting. Source


Zheng H.,Hunan Agricultural University | Zheng H.,Key Laboratory of Multi Cropping Cultivation and Farming System | Huang H.,Hunan Agricultural University | Huang H.,Key Laboratory of Multi Cropping Cultivation and Farming System | And 6 more authors.
Soil and Tillage Research | Year: 2014

The trace of high and low ridge in the Sanyangzhuang village site showed that adopting ridge tillage cultivation technology (RT) in China has a long history of more than 2000 years. In this paper, we reviewed recent advances of the development and application of RT in China. The better yields from crops grown on ridges/furrow compared with those on flat land were attributed mainly to the improvement of soil moisture conditions, better air permeability and effective supply of soil nutrition. However, most studies of RT are mainly concentrated in upland crop. It has not been reported on RT's higher water use efficiency (WUE) and the capacity of drainage & impounding during the rice production process. New systems of ridge tillage & terrace cultivation model (RTT) for irrigated rice are described here. Further research is needed to optimize management strategies and to strengthen basic research for RTT to obtain environmental and economic benefits and to evaluate practicability and effectiveness of RTT in the paddy field. © 2014 Elsevier B.V. Source

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