The efficiency of biogas effluent fermented with pig manure and longan residues on
growth of marigold was investigated. Treatments were control (no fertilizer), and four
concentrations (10%, 20%, 30% and 40%) of biogas effluent and chemical fertilizer. Plants
were watered with 200 ml of each biogas effluent concentrationt every 4 days. Chemical
fertilizers were applied as 15-15-15 and 8-24-24. Results showed that the growth of marigold in
the control was lowest as compared to the other treatments. There was no significant difference
in the plant height, stem diameter, bush diameter, fresh weight of blooming flowers and
initiation of first flower between biogas effluents and chemical fertilizer. Fresh weight of whole
plant and number of blooming flowers resulting from the chemical fertilizer treatment was
highest compared to the control and effluent treatments. Dry weight of whole plant resulting
from the chemical fertilizer treatment was not significantly different compared to 10%, 20%
and 30% biogas effluent treatments. Total chlorophyll and chlorophyll per unit leaf area in the
chemical fertilizer did not differ as compared to 30% and 40% biogas effluent treatments.
Keywords
biogas effluent, longan, marigold, growth
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
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