Seed Nutrient and Leaf Mineral Content of Jack Bean (Canavalia Ensiformis L.) Cultivated With Organic and Bio-Fertilizers in Grumusol Soil

The aim of this study was to determine the seed nutrient content and leaf mineral status of jack bean cultivated in grumusol soil treated with bio-fertilizers and soil ameliorants. The research was conducted on marginal land in Playen Village, Yogyakarta, Indonesia which is at an altitude of 250 m above sea level. The experimental research was conducted with a 2 x 2 x 2 factorial design. The first factor was the type of bio-fertilizers consisting of mycorrhiza and Rhizobium. The second factor was the kind of ameliorants consisting of chicken manure and green manure. The third factor was the dose of bio-fertilizers consisting of 10 g kg^-1 seeds, and 20 g kg^-1 seeds. Two treatments which were chicken manure and green manure both without bio-fertilizer were used as controls. The results indicated that a combination of green manure and Rhizobium 20 g kg^-1 seeds produced the highest protein seed content (28.68 %). The green manure and Rhizobium 10 g kg^-1 seeds resulted in the highest carbohydrate seed content (59.98%), while the combination of chicken manure and Rhizobium 10 g kg^-1 seeds produced the highest lipid seed content (2.62%). Moreover, the results indicated that application of chicken manure and mycorrhiza with a dosage of 20 g kg^-1 seeds resulted in the highest leaf N content (4.04%), application of green manure and mycorrhiza 20 g kg^-1 seeds resulted in the highest leaf P content (0.79%), whereas application of chicken manure and Rhizobium 10 g kg^-1 seeds produced the highest leaf K content (1.41%). The application of chicken manure resulted in fewer nodules than green manure application.

Keywords: grumusol soil; jack bean; seed nutrient; soil amendment

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                                            E-mail: yacobus.sunaryo@ustjogja.ac.id