Effect of pre-rice legume and residue incorporation on rice yield [in Philippines]
1991
Alam, M.M. | Garrity, D.P.
A field experiment was conducted during 1988 to determine the effect of green manure or grain legume residue incorporation on the yield of irrigated rice as influenced by different gap periods between incorporation and rice transplanting. Delay in planting after 29 April showed a decreasing trend in legumes grain yield. This was attributed to more rainfall and high soil moisture content. Mumgbean was found more susceptible to heavy rainfall and high soil moisture content than cowpea and showed a decreasing trend in residue yield due to leaf senescence with delay in planting dates. Frequent rainfall at later growth stages was found favourable for the vegetative growth of cowpea but heavy rainfall during entire growth period adversely affected its growth and development. Green manure or grain legume residue incorporation substituted 60 kg N ha in the following rice. The release of Sesbania green manure N was faster than grain legume residue N and thus resulted in the availability of residue N for longer periods than green manure N. Increasing gap period between incorporation of legume residues and rice transplanting reduced the effectiveness of green manure more than that of grain legume residues. The rice grain yield per kg of green manure N added was reduced by 2% and 1% for 21- and 35-day-gap periods, respectively, from 7-day-gap period.
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