Productivity, nutrient use efficiency and energy utilization of yam bean [Pachyrhizus erosus (L.) Urban] genotypes in Ilocos Norte, Philippines
2010
Bernabe, J.A., Philippines Univ. Los Baños, College, Laguna (Philippines)
The study was conducted in three sites of varying climatic and edaphic characteristics in Ilocos Norte from April 2008 to April 2009 to determine the productivity, nutrient use efficiency, cost and return analysis, and energy cost of producing yield of five yam bean genotypes grown under four fertilizer treatments namely: unfertilized/control, dried chicken manure (DCM), 50% DCM + 50% inorganic fertilizer (IF) and IF. The performance of the five yam bean genotypes under different fertilizer treatments in each site were evaluated based on the following parameters: shoot growth, root growth, dry matter production, dry matter partitioning to the economic yield, yield, nutrient uptake and conversion efficiency of absorbed nutrient to produce dry matter yield, net income, return on investment, and energy utilization in the production of economic yield. Based on the combination of experimental variables, such as fertilizer treatments and genotypes grown in three sites with varying edaphic and climatic characteristics, the application of 50% DCM + 50 IF produced the highest yam bean yield in Sites 1 (Sarrat) and 2 (Dingras) which have a relatively good soil characteristics and climatic conditions. The application of DCM in Site 3 (Bangui), which is characterized by sandy texture, uneven rainfall, windy condition or in general drought prone area, produced the highest yield. None of the test genotypes had consistent performance (yield) across sites. Plants applied with DCM were efficient in converting absorbed N, P and K into yield. Among the genotypes, Genotype 5 was the most efficient in converting absorbed N, P and K. The ROI across sites is constantly highest in unfertilized plants, which reflects low cost of production under low yield levels. The application of IF is the most energy consuming in producing yam bean, as reflected in the highest LDOE [liter diesel oil equivalent]. The lowest LDOE was obtained in the unfertilized yam bean crop.
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