32. Performance of three centrosema spp. And pueraria phaseoloides in grazed associations with andropogon gayanus in the eastern plains of Colombia.
Trop. Agric. (Trinidad), 68, 4, 1991, pp. 363-365
The most important factor limiting animal production in the vast savannas (Llanos and Cerrados) of tropical America is the poor nutritive value of native grasslands and monospecific sown grass pastures. A fundamental approach in correcting these nutrient deficiencies is to establish improved pastures that are based on tropical legume and grass mixtures.
Over a three-year period, Centrosema acutifolium CIAT 5277, C. arenarium
CIAT 5236, C. macrocarpum CIAT 5065 and Pueraria phaseoloides CIAT 9900 were evaluated under grazing. Each legume was associated with Andropogon gayanus cv. Carimagua 1.
The experiment was conducted in Eastern Plains of Colombia.
The experiment was sown on a prepared seedbed in June 1982. There were two replicates of the four pasture treatments in a randomized complete block design.
The two replications were grazed separately by five criollo x zebu cross-bred heifers which was equivalent to two animal units ha-1 for seven consecutive days. The plots were then rested for 42 days during the dry season and a rotation was employed during the wet season.
The persistence of C. acutifolium was attributed to its stoloniferous growth habit. This legume exhibited tolerance of grazing and drought and has resistance to pests and diseases. The four legumes evaluated under grazing failed to produce soil seed reserves for recruitment of new plants and this contributed to the general decline in legume contents.
Pueraria phaseoloides (Roxb.) Benth. showed poor tolerance of drought and C. macrocarpum Benth. was adversely affected by grazing and low soil fertility. C.arenarium Benth., the least palatable species in the experiment, has proved to be unsuitable for grazing utilization.
It can be concluded that under the management treatments superimposed on the experiment, regeneration of legume from soil seed reserves has not occured in any of the grass-legume associations, and this contributed to the general decline in legume contents.
Of the legumes evaluated, only C. acuticolium has a stoloniferous growth habit, and its persistence and tolerance of grazing was attributed to this trait. This legume has tolerance of drought and has excellent resistance to pests and diseases.
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Asia, India, field trial, intercropping systems, mulch, barley, lentil, flax, yield, irrigation
MANDAL, B.K. and S.K. MAHAPATRA
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