Productivity and residual effects of legumes in rice-based cropping systems in a warm-temperate environment - I. Legume biomass production and N fixation

Field experiments were conducted to investigate the performance of temperat e legume species in rice-based cropping systems in a warm-temperate environ ment in Nepal. Over the period 1994-1996, various legume species were grown during the winter season (October-May) in the Kathmandu valley (27 degrees N, 1350 m asl) with the aim of evaluating their biomass production and N f ixation. A wide range of legume species including food, feed and green manu re crops proved to be very well adapted to the winter growing conditions in this environment. The cultivation of temperate legume crops therefore, con stitutes an alternative to traditional cropping practices such as growing w heat or leaving the land fallow. The temperate species appeared to capitali se on generally favourable growing conditions such as long growing season, low pest and disease pressure, high radiant energy receipt and cool night t emperatures. However, performance varied greatly between species and years. Total dry matter yields ranged from 2 to 20 t ha(-1) obtained with lentil (Lens culinaris Medic) and bitter lupin (Lupinus mutabilis), respectively. Highest seed yields were produced by fababean (Vicia faba) (5 t ha(-1)) and field pea (Pisum sativum var, arvense) (3 t ha(-1)) in the first season. N itrogen yields and quantities of N fixed ranged from 18 to 481 kg ha(-1) an d from 0 to 463 kg ha(-1), respectively. Large amounts of N were fixed by s pecies such as fababean, Persian clover (Trifolium resupinatum) and bitter lupin. Early sowing in autumn was shown to be beneficial for some crops suc h as fababean, vetch (Vicia benghalensis) and Persian clover. In these case s, it is, therefore, important to reduce the turn-around interval after ric e. Further research is required to fully determine the potential of tempera te legume species in these environments with particular emphasis given to t he identification of the most adapted cultivars and to reduce the need for irrigation of these winter crops. (C) 1999 Elsevier Science B.V. AU rights reserved.