Nitrous oxide (N2O) fluxes from soils were measured using the closed chamber method during the snow-free seasons (middle April to early November),for three years,in a total of 11 upland crop fields in central Hokkaido...Nitrous oxide (N2O) fluxes from soils were measured using the closed chamber method during the snow-free seasons (middle April to early November),for three years,in a total of 11 upland crop fields in central Hokkaido,Japan.The annual mean N2O fluxes ranged from 2.95 to 164.17 μgN/(m2·h),with the lowest observed in a grassland and the highest in an onion field.The instantaneous N2O fluxes showed a large temporal variation with peak emissions generally occurring following fertilization and heavy rainfall eve...展开更多
Rodents are a serious constraint to poor farmers in the upland and lowland farming systems of the Lao People’sDemocratic Republic and have been described as the pest they have least control over. To better understand...Rodents are a serious constraint to poor farmers in the upland and lowland farming systems of the Lao People’sDemocratic Republic and have been described as the pest they have least control over. To better understand theseproblems a baseline survey of farmers was conducted to assess their knowledge, attitudes, and practices with respectto rodent management. A structured survey was conducted in 12 villages across Luang Namtha, Luang Prabang,and Houaphan provinces. Twenty farmers from each village were interviewed (a total of 240 farmers). Farmersnoted that the main factor limiting production was pests (70%), with rats identified as the most important pest(98%). The mean yield loss was estimated at 19% (range 0–100%). Trapping and rodenticides were commonlyused by farmers. Farmers believed that it was important to control rats and believed that rats could only be controlledif farmers worked together. However, 65% of farmers conducted rodent control by themselves, and 92% offarmers believed that rodenticides were harmful to the environment. The main constraints identified were the highcost of some control methods and the need to get farmers to work together as a community.展开更多
Subject Code:C06With the supports by the National Natural Science Foundation of China,collaborative studies by the research groups led by Prof.Zhang Tianzhen(张天真)from Nanjing Agricultural University,presently Zheji...Subject Code:C06With the supports by the National Natural Science Foundation of China,collaborative studies by the research groups led by Prof.Zhang Tianzhen(张天真)from Nanjing Agricultural University,presently Zhejiang University,Prof.Du Xiongming from the Institute of Cotton Research(ICR),Chinese展开更多
基金the Global Environmental Research Program of the Ministry of the Environment of Japan (No.S-2).
文摘Nitrous oxide (N2O) fluxes from soils were measured using the closed chamber method during the snow-free seasons (middle April to early November),for three years,in a total of 11 upland crop fields in central Hokkaido,Japan.The annual mean N2O fluxes ranged from 2.95 to 164.17 μgN/(m2·h),with the lowest observed in a grassland and the highest in an onion field.The instantaneous N2O fluxes showed a large temporal variation with peak emissions generally occurring following fertilization and heavy rainfall eve...
基金the Australian Centre for International Agricultural Research(SFS/2004/016),CSIRO Sustainable Ecosystems,and the National Agriculture and Forestry Research Institute.
文摘Rodents are a serious constraint to poor farmers in the upland and lowland farming systems of the Lao People’sDemocratic Republic and have been described as the pest they have least control over. To better understand theseproblems a baseline survey of farmers was conducted to assess their knowledge, attitudes, and practices with respectto rodent management. A structured survey was conducted in 12 villages across Luang Namtha, Luang Prabang,and Houaphan provinces. Twenty farmers from each village were interviewed (a total of 240 farmers). Farmersnoted that the main factor limiting production was pests (70%), with rats identified as the most important pest(98%). The mean yield loss was estimated at 19% (range 0–100%). Trapping and rodenticides were commonlyused by farmers. Farmers believed that it was important to control rats and believed that rats could only be controlledif farmers worked together. However, 65% of farmers conducted rodent control by themselves, and 92% offarmers believed that rodenticides were harmful to the environment. The main constraints identified were the highcost of some control methods and the need to get farmers to work together as a community.
文摘Subject Code:C06With the supports by the National Natural Science Foundation of China,collaborative studies by the research groups led by Prof.Zhang Tianzhen(张天真)from Nanjing Agricultural University,presently Zhejiang University,Prof.Du Xiongming from the Institute of Cotton Research(ICR),Chinese
