Using of Biofilter Media and Bacillus thuringiensis var. kurstaki on the Growth of Watercress (Nasturtium officinale) in an Aquaponic System
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Abstract
Aquaponics systems supports the UN's Sustainable Development Goal (SDG2) and promote sustainable agriculture. Therefore, this study aimed to compare types of biofilter media and biological control by using Bacillus thuringiensis var. kurstaki (BT) and their effects on vegetative growth and water quality in an aquaponics system. The experiments were 2x2 completely randomized factorial design with six replications (five plants per replication). Factor 1 was biofilter types (pumice stone and bio-ball) and Factor 2 was biological logical control (BT application with and without BT). The experiment was conducted at the Department of Agricultural and Fisheries Science, Prince of Songkla University, Pattani Campus, over an 8-week period. The resulted showef that; bio-filter materials (pumice stone and bio-ball) had no affect on growth of watercress in terms of plant length and stem diameter (P>0.05). Plant lengths were 12.59 to 12.68 cm, and stem diameters were from 0.16 to 0.21 cm. However, the application of BT showed significantly differences in plant length (P<0.05), with an average length of 12.81 cm. There were no significant differences in stem diameter (P>0.05), which were from 0.14 to 0.20 cm. The water quality parameters of plant table; temperature were 30.81-32.70 °C, pH levels were 7.47 and 8.10, electrical conductivity (EC) were 0.27-0.47 dS/m, and dissolved oxygen (DO) levels were 5.33-6.28 mg/l. In conclusion, there was no statistically significant difference in the vegetative growth of watercress between the pumice stone and bio-ball treatments. Additionally, the biological control using BT did not show differences in controlling insect pests in watercress.
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บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการเผยแพร่ในวารสารวิทยาศาสตร์และเทคโนโลยี มรย. นี้ ถือเป็นลิขสิทธิ์ของวารสารวิทยาศาสตร์และเทคโนโลยี มรย. หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือกระทำการใดๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษรจากวารสารวิทยาศาสตร์และเทคโนโลยี มรย. ก่อนเท่านั้น
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