Potencial productivo de ecotipos de Arachis pintoi en el Piedemonte de los Llanos Orientales de Colombia
Rincón Castillo, Alvaro
Two experiments were carried out at La Libertad research center in Villavicencio (Colombia), under edaphoclimatic conditions representative of the piedmont of Colombia's Eastern Plains, to evaluate Arachis pintoi ecotypes regarding quality characteristics, consumption, and persistence. These were foud to be similiar to those of A. pintoi cv. Maní Forrajero Perenne, but their establishment was faster and their forage production higher. Eleven ecotypes of A. pintoi were evaluated in association with Brachiaria dictyoneura in Experiment 1 , including A. pintoi cv. Mani Forrajero Perenne as check. Plant cover at 120 days after planting was higher (P 0.05) in A. pintoi ecotypes CIAT 22160, 18748, 18744,18752,20826, and 22241, with values ranging between 72% and 88%. The DM production (t/ha) 45 days after the uniformity cut performed at end of establishment was higher (P 0.05) for A. pintoi CIA T 22160 (2.02),18748 (1.97), and 18744 (1.04). Three superior-performing materials evaluated in Experiment 1 (A. pintoi CIAT 22160, 18748, and 18744) and A. pintoi cv. Mani Forrajero Perenne were evaluated in Experiment 2. Results indicated that the number and length of stolons and internodes were similar among these materials; however, forage production 180 days after uniformity cut was twice as high in A. pintoi CIA T 22160 and 18748 than in the other materials evaluated. One year after planting, root biomass up to 25-cm depth in the soil was similar among ecotypes; at this age, 90% of the roots were concentrated in the top 25 cm of the soil
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