Monday, November 13, 2006
49-11

Increasing Fodder Production in Central Tibetan Farming Systems.

Tom Giles1, Nicholas Paltridge2, and David Coventry1. (1) Univ of Adelaide, Roseworthy Campus, Adelaide, Australia, (2) Univ of Adelaide, Roseworthy Campus, Adelaide, Australia

The raising of livestock is of great importance in the Tibet Autonomous Region of China (TAR), since animal products are a primary source of cash income in many rural households.  However, animal nutrition is currently very poor, with animal feeds based on by-products (mostly straw) from the predominant cereal crops, and low quality fodder and forage from the mountains.  Over the past 2 years, field experiments have been established at three different sites to investigate the productivity of cereal / fodder legume intercrops within the central Tibetan environment.  In the first set of experiments, relay intercrops were constructed with winter cereals (wheat or barley) grown at a range of different row arrangements with vetch or alfalfa sown into the inter-row space.  Preliminary results showed that satisfactory grain yields (3 - 5 tonnes/ha and roughly equivalent to typical farmer yields) could be attained at lower cereal densities (e.g., from 50% or 67% cereal densities).  Fodder yields appeared inversely proportional to cereal density.  Vetch produced approximately twice the dry matter of lucerne in the 6 months following establishment (3 tonnes/ha at 50% density rather than 1.5 tonnes/ha).  Experimentation is continuing during the 2005/06 growing season.  In addition, experiments are underway to assess the performance of vetch/winter cereal intercrops established by broadcasting vetch seed into winter cereals sown using normal farmer methods.