Sustainable production in an upland rice-based farming systems.
1992
Garcia A.G.
Two studies were conducted over a three crop-year period (1988-91) in an upland environment with the following objectives: (1) to evaluate the immediate and cumulative effects of crop residue incorporation on the productivity of an upland rice-based cropping patterns and (2) to determine the comparative effects of inorganic and organic fertilizers on the growth and yield of upland rice. Results revealed that upland rice intercropped with mungbean (Mg) or cowpea (Cp) had Land Equivalent Ratio (LER) greater than 1.00 indicating advantage of intercropping over monoculture. Furthermore, LER were higher when crop residues were incorporated. However, crop residue incorporation in the treatment upland rice intercropped with corn (C) had a negative effect since the corn residues were not easily decomposed. For the dry season, corn yield was higher when residues were incorporated and that the previous crops were UR + Mg, UR + Cp, Mg or Cp. On the contrary, if the previous crops were UR + C or C, corn yield was higher when residues were removed. Over a three-year period, soil organic matter significantly increased when crop residues were incorporated and the greatest increment was observed in Cp-C, UR + Cp-C and UR + Mg-C patterns. On the other hand, soil organic matter decreased when residues were removed. Furthermore, an increase in soil organic matter was observed when organic fertilizer (chicken manure) was used while a significant decreased in soil organic matter was recorded when no fertilizer was applied.
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