Agroforestry Systems

, Volume 31, Issue 1, pp 1–19 | Cite as

Decreasing rice and cowpea yields in alley cropping on a highly weathered Oxisol in West Sumatra, Indonesia

  • C. I. Evensen
  • T. S. Dierolf
  • R. S. Yost


A hedgerow intercropping study was conducted for 7 years in West Sumatra, Indonesia on an acid and highly A1-saturated (72%) soil to determine growth and yield responses of tree hedgerows and upland rice and cowpea intercrops. Three tree species,Paraserianthes falcataria, Calliandra calothyrsus, andGliricidia sepium, and a no tree control were planted at three lime rates of zero, 375 kg ha−1, and liming to 25% Al+H saturation. Annual fertilizer inputs of 20 kg P and 50 kg K ha−1 were kept low to approximate low input farming systems. The trees were pruned 4 to 6 times per year and prunings applied to the intercrops.Paraserianthes andCalliandra grew vigorously, whileGiricidia grew poorly and was replaced after four years withFlemingia macrophylla. Hedgerow growth and yields were reported in a previous paper [Evensen et al., 1994].

Rice and cowpea yields initially increased with lime andParaserianthes pruning application, but yields and soil cations (Ca, Mg, and K) declined until fertilizer inputs were increased after four years. Thereafter, crop yields increased and soil cations returned to original levels. Soil C and N were maintained over the 7 years on plots with trees. These results indicate little build-up of nutrient cations due to recycling by the trees and suggest that successful alley farming on such highly weathered soils requires maintenance of soil fertility with external inputs.

Key words

multipurpose tree green leaf manure liming acidic soil aluminum toxicity 


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • C. I. Evensen
    • 1
  • T. S. Dierolf
    • 1
  • R. S. Yost
    • 1
  1. 1.Soil Management Collaborative Research Support ProgramUniversity of HawaiiHonolulu

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