Yield performances of potato (Solanum tuberosum L.) as amended with liquid organic fertilizer and vermicompost
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Abstract
Closed Agriculture Production System (CAPS) Research Center, Faculty of Agriculture, Universitas Bengkulu has developed liquid organic fertilizer since 2014 by using locally available natural resources for vegetable production under closed agriculture production system. The effectiveness of liquid organic fertilizer has been evaluated on sweet corn, carrot, caisim, cauliflower, long bean, ground nut and broccoli. This research reported the use of liquid organic fertilizer in combination with vermicompost on yields of organically grown potato. Results indicated that the use of liquid organic fertilizer increased total number of tuber per plant, total weight of tuber per plant, tuber weight per plot, but not tuber diameter and marketable tubers. The use of vermicompost increased tuber diameter, total weight of tuber per plant, tuber weight per plot and number of marketable tubers, but not total weight of tuber per plant. Nevertheless, no interaction effects were recorded to all observed variables. In conclusion, both vermicompost and liquid organic fertilizer could independently increase potato yields. Under closed production system, the used of 10 ton ha-1 vermicompost was as effective as of 15, 20 and 25 ton ha-1. Future research should be addressed to determine the concentration of liquid organic fertilizer for potato production.
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