A preliminary survey of cropping systems in Tibet

Authorities in the Tibet Autonomous Region of China are concerned about the sustainability and productivity of food production systems, and have initiated a number of projects that aim to boost grain production. However, there is limited information available on current cropping systems, yields and likely yield constraints. To address this knowledge gap, structured interviews were undertaken in 45 farming households across Tibet’s central cropping zone. Information was obtained on the crops grown, common farming practices and yields typically attained. Spring barley and winter wheat were found to be the predominant crops, followed by rapeseed, winter barley, and minor fodder and vegetable crops. Cropping systems were characterised by heavy tillage, high sowing rates, high rates of fertiliser application, some use of herbicides, little stubble retention and low levels of mechanisation. Most crops were irrigated, and yields of the main cereal crops were found to be about 4−4.5 t/ha. It is suggested that research and extension in the areas of crop variety, weed control, crop nutrition and seeding technology should lead to significant increases in grain yield. Research is also needed to improve understanding of socio-economic issues, and to improve animal fodder supply so that more crop residues can be retained after harvest.Nicholas Paltridge, Jin Tao, Murray Unkovich, Nyima Tashi and David Coventryhttp://www.regional.org.au/au/asa/2008