| [n2o emission from rice-rapeseed rotation system in chengdu plain of sichun basin]. | by using static chamber/gas chromatograph techniques, the n2o emission from rice-rapeseed rotation system in chengdu plain of sichuan basin was measured from june 2005 to june 2006, with its characteristics and affecting factors investigated. the results showed that the total emission of n2o in a rotation cycle was (8.3 +/- 2.8) kg x hm(-2) x a(-1), and the emission in rice season, rapeseed season and fallow season accounted for 30%, 65%, and 5% of the total, respectively. in rice season, the me ... | 2008 | 18808020 |
| [effects of tillage-cropping systems on methane and nitrous oxide emissions from permanently flooded rice fields in a central sichuan hilly area of southwest china]. | using the static opaque chamber method, a field experiment was conducted in situ for two years to study the effects of three cultivation systems on ch4 and n2o emissions from permanently flooded rice fields in a hilly area in southwest china. the results show that the average ch4 fluxes from a permanently flooded rice field with a single middle rice crop and flooded with no winter crop (pf) were (21.44 +/- 1.77) mg x (m2 x h)(-1) and (3.77 +/- 0.99) mg x (m2 x h)(-1) during rice-growing and non- ... | 2006 | 16686176 |
| [relationships between biochemical qualities of paddy rice and climate conditions in the anning river valley]. | based on the experimental data of paddy rice planted geographically periodically without control in the anning river valley of sichuan province, this paper quantitatively analyzed the effects of meteorological conditions from 40 days before heading to ripeness on the biochemical qualities of paddy rice, and developed a model about the integrated relationships between biochemical qualities of paddy rice and mean temperature, daily range of temperature and daylight hours, which would be of signifi ... | 2004 | 15825441 |
| new irrigation methods sustain malaria control in sichuan province, china. | malaria appears to have been all but eradicated from certain areas of sichuan province mainly as a consequence of draining a sufficient proportion of rice paddy fields. the two main malaria vectors, both members of the anopheles hyrcanus group, breed prolifically in rice paddy fields, which farmers have traditionally kept flooded all year round to ensure an adequate water supply. over the last three decades, the irrigation network has been gradually extended, thus ensuring water security and inc ... | 2004 | 14732245 |
| [a study on cadmium content in foods of six provinces and cities]. | contents of cadmium in six kinds of foods were monitored in 626 specimens from beijing, shanghai, jiangsu, sichuan, jilin and guangdong in 1992, with proportions of 95% for rice, 87.8% vegetables, and 100% wheat flour, meat, eggs fish and dairy products, respectively, up to the national hygienic standards. the average weekly intake of cadmium from foods of residents in six monitored areas was lower than that of the provisional allowable intake set by who. | 1994 | 8082461 |