Effect of Enriched Manure Extract on Growth and Yield of Green Oak Lettuce in the Hydroponic System

Abstract

Effect of enriched manure extracts on growth and yield of green oak lettuce in the non-circulated hydroponic system with air bubble was studied. The experiment was conducted in completely randomized design (CRD) consisting of 5 treatments as follows: 1) inorganic standard solution (Stock A + Stock B) ratio 1:1 (control, T1), 2) vermicompost extract (T2), 3) cow manure extract (T3), 4) swine manure extract (T4) and 5) goat manure extract (T5). All manure extracts were enriched with molasses,aerated and adjusted the EC to 2 mS/cm. Growth of green oak laettuce was recorded every 5 days and plants were harvested at 25 days after transplanting (40 days). The results showed that green oak lettuce treated with inorganic standard solution had the highest leaf number, canopy width and weight, with  statistically highly significant difference, when compared to those treated with all enriched manure extracts. Leaf greeness values of green oak lettuce treated with enriched vermicompost and goat manure extracts and inorganic standard solution were similar, but higher than those of enriched swine and cow manure extracts with statistically highly significant difference. In addition, the enriched goat manure extract tends to be good to substitute for the inorganic standard solution in the green oak lettuce production