Potentials of selected tree species as hedgerows for gabi [Colocasia esculenta (L.)] and camote [Ipomoea batatas (L.) Lam.] as alley crops in Samar, Philippines
1993
Baya, W.A.
The significant contribution of each hedgerow species to the nutrient content of the soil particularly OM, P, and K is the main reason why each hedgerow had significantly enhanced the growth and yield performance of both the alley crops and the hedgerows themselves, mainly through N-fixation and nutrient cycling. For soil physical properties, although significant variations were observed on percent silt and clay during the study period, in the overall, the two textural classes of sandy clay loam to clay loam of the experimental area remained significantly similar before and after the completion of the study. Kakawate exhibited the highest overall yield of fresh weight herbage at 84.87 t/ha which did not differ significantly with Flemingias' 81.28 t/ha that of Kakawate and Flemingia, however, each significantly differed with the overall fresh weight herbage yield of sesbanias' 47.66 t/ha. In terms of dry weight herbage yield, Flemingias' 28.58 t/ha significantly outyielded kakawate's 21.22 t/ha which in turn significantly differed with Sesbanias' 14.30 t/ha. Both Kakawate and Flemingia have higher properties of leaf yield over their respective stem yield. Sesbania on the other hand, had lower proportion of leaf yield compared with its stem yield. Kakawate and Flemingia also exhibited drought resistance and showed higher potentials for enhancing nutrient cycling compared with Sesbania. Rainfall characteristics differed significantly between the first and second cropping, drought being more pronounced in the second cropping
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