Zero-grazed pasture under immature Hevea rubber: improved productivity of Panicum maximum and P. maximum and Pueraria phaseoloides and their competition with Hevea [Sri Lanka]
1982
Waidyanatha, U.P. de S. | Wijesinghe, D.S. | Stauss, R. (University of Hohenheim, Stuttgart (Germany, F.R.). Inst. for Phytomedicine)
Much higher yields of pasture than in a previous study were obtained when Panicum maximum (cultivar Guinea B), or this grass in association with Pueraria phaseoloides was interplanted with rubber. The yields, however, declined over the 4-year experimental period. The mixture yielded substantially more than the pure grass, but the legume component was productive only in the first 2 years. The grass component of the mixture yielded as high, or, in one year, higher than the pure grass, and also contained higher concentrations of N, P, Mg and Ca. Pasture competition on tree growth appeared to increase as trees grew, and girth differences between trees in the pastures and in a legume cover were highest at 3.5 and 4.5 years. At 4.5 years, the trees in the cover were of tappable girth (50 cm) whereas those in the pastures were, on average, 16% less. The final girth of trees was not significantly affected whether the pasture was 1.0 or 1.5 m away from the rubber trees
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