Effects of intercropping systems on surface processes in an acid ultisol 2. Changes in soil chemical properties and their influence on crop performance
1993
Zainol M. E. | Mahmud A. W. | Mohd. Noor S.
The chemical changes in an acid Ultisol under intercropping, were monitored over thirty-three months. The systems of intercropping under immature rubber were designed on the basis of conservation-oriented surface vegetative cover. The lower input systems include interrows under a) naturals, and b) legumes; while the intercropped plots represent the high input treatments comprising c) peanut and corn rotation, d) pineapple, and e) combination of peanut-corn and pineapple. The use of fertilisers and the corrective input of lime influence the soil fertility dynamics. Towards the later croppings, the pH declined in all inter row systems, with a marked decrease in the highest input plots. The intercropped treatments showed significant residual amounts of phosphorus, calcium and magnesium. Over several croppings, the effective cation exchange capacity remains high and the soils have low aluminium saturation. Intercropping has an overall beneficial effect on growth of Hevea due to the combined effect of added fertilisers and lime.
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