Spraying Doses Bio-extract from Trimmed Asparagus Waste on Growth and Yield of Thai Eggplant (Solanum virginianum L.)
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Abstract
Harvesting and pruning process of asparagus production produce large amount of waste, that can be used as a plant nutrient. This research aimed to study the optimum ratio of bio-extract from trimmed asparagus waste for growth and yield of Thai eggplant variety Khai Tao at Community-based Seed Production, Lamtakong Research Station in Pak Chong district, Nakhon Ratchasima province. A completely randomized design (CRD) was designed for 5 treatments with 4 replications, 3 plants per replication. The treatments included control (No spraying bio-extract) and spraying bio-extract from trimmed asparagus waste in the ratio of bio-extract: water by volume at 1:2,000, 1:1,000, 1:500 and 1:250. The results found that spraying bio-extract at ratio of 1:2,000 by volume had significantly higher number of flowers per eggplant plant at 121 days after planting than spraying at other ratios (P < 0.01). However, the yield of each treatment was not statistically different (P > 0.05). Spraying bio-extract at ratio of 1:2,000 by volume tended to have the highest average fresh weight per fruit and yield per rai. The production yield increased by 18.4% than the control group. Therefore, spraying bio-extract at ratio of 1:2,000 by volume could be a suitable ratio for growth and productivity of eggplant. However, applying bio-extract from trimmed asparagus waste for plants should be used in conjunction with organic or chemical fertilizers to increase plant nutrition to the soil.
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