Abstract
Green biomass is one of major nutrient source and determines the quality of liquid organic fertilizer (LOF), including Gliricidia sepium (Jacq.) Kunth ex Walp. An experiment was conducted to study the effects of Gliricidia-enriched LOF on growth and yields of caisim, arranged in randomized complete design with three replicates. Treatments consisted of six LOF concentrations, 0%, 20%, 40%, 60%, 80% and 100%. Results indicated that concentration of gliricidia-LOF significantly influenced leaf greenness and shoot fresh weight, but not root to shoot ratio and shoot water content. Concentrations of gliricidia-LOF increased leaf greenness and shoot fresh weight of caisim. The optimum concentration was 70.85% to produce weight of 73 grams caisim per plant. Root to shoot ratio was not significantly different. Although treatments did not affect shoot water content, all caisim water content was on average above 90 %.
Highlights
Consumer demands for organically grown vegetables, including caisim (Brassica juncea L.), have been notably increasing during the last two decades since many people in all over the world are getting more educated and prosperous
Leaf greenness reflects the concentration of chlorophyll presence in the chloroplasts and its amount determines rate of crop photosynthesis
Increased leaf greenness might be related to nutrient content in G. sepium leaves with high N
Summary
Consumer demands for organically grown vegetables, including caisim (Brassica juncea L.), have been notably increasing during the last two decades since many people in all over the world are getting more educated and prosperous. Significant increases of worldwide organic foods took place in 1990s (Thompson, 2000) and continue to increases until the present time. Increased demand was related to increased consumers’ awareness about health benefits from organic vegetables. Such increases require continuous supply to the markets and organic vegetable production must be able to ensure the market demands without sacrificing the quality of land and water resources
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