Rabbit manure and burnt rice husk boosts shallot growth, yield, and soil chemical properties over NPK fertilizers

Purpose: Dependency on chemical fertilizers in shallot production has increased farmers’ production expenses and resulted in several environmental issues. Using organic fertilizers and soil amendments can help reduce reliance on chemical fertilizers. Method: The three shallot cultivars utilized in this study were Bawang BAW1 (MARDI) (BM), Bawang India (BI), and Bawang Siam (BS). The experiment was arranged in three different randomized complete block designs according to the other cultivars with four replications and treated with five fertilizer treatments which were (a) control, (b) NPK fertilizer (NPK) of 15:15:15 at 450 kg/ha (CF), (c) Rabbit manure (RM) + burnt rice husk (BRH) (organic fertilizer (OF)), (d) 225 kg/ha NPK + OF (OCF1), and (e) 112.5 kg/ha NPK + OF (OCF2). Growth performance, yield and soil properties after harvest were recorded. Results: OF treatment resulted in the best outcomes in terms of total weight, bulb diameter, bulb weight, marketable yield, and macronutrient content across the three shallot cultivars, compared to the other treatments. The combination of OF with NPK fertilizer (OCF1 and OCF2) consistently ranked second in growth, yield and macronutrient content while also leading to notable improvements in various soil chemical properties, particularly the availability of essential nutrients and cation exchange capacity (CEC). Conclusion: The application of OF showed great promise as an organic alternative for shallot production, as it gave the highest yield and macronutrient content across the three cultivars.

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