Nutrient characterization of liquid organic fertilizer derived from watermelon rind and growth responses of curly lettuce (Lactuca sativa var. crispa)
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watermelon rind,
plant growth,
liquid organic fertilizer,
curly lettuce
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Abstract
This study characterized the nutrient content of liquid organic fertilizer derived from watermelon rind (LOF) and evaluated curly lettuce (Lactuca sativa var. crispa) growth at four application concentrations. LOF was fermented with EM4 and brown sugar for 14 days. A completely randomized design comprised no LOF (P0), LOF:water ratios of 1:2 (P1) and 1:1 (P2), and undiluted LOF (P3), with three replicates each. Measurements included plant height, leaf number and color, survival, and fresh weight. The fertilizer contained 0.61% organic C, 0.03% total N, 0.04% P?O?, 0.38% K?O, and a C/N ratio of 20.3. At the final observation, P2 had a mean height of 10.25 cm and a mean fresh weight of 0.95 g among surviving plants. Survival was 100% in P1, 66.67% in P2, and 33.33% in both P0 and P3. Total fresh weight was identical in P1 and P2 at 1.90 g. Analysis of yield per experimental unit, coding dead-plant units as zero, yielded F(3,8) = 1.111 and p = 0.400. Fresh weight per experimental unit did not differ significantly among treatments. P2 showed a descriptive advantage in height and surviving-plant fresh weight, whereas P1 had the highest survival rate.
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