Comparative study on Liquid Organic Fish Fertilizer produced from marine and fresh water fish wastes
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Date
2021
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Fisheries College and Research Institute, Tamil Nadu Dr. J. Jayalalithaa Fisheries University, Thoothukudi
Abstract
In the present study, a comparative analysis was made between different combinations of liquid organic fish fertilizers produced from marine (sardine) and fresh water (tilapia) fish waste and its affectivity was analysed based on the growth of black gram (Vigna mungo). The different combinations of liquid fish fertilizers include: T1 as Sardine waste and Jaggery; T2 as Tilapia waste and Molasses; T3 as Sardine waste+ Tilapia waste+ Molasses; T4 as Tilapia waste and Jaggery; and T5 as Sardine waste and molasses respectively and were prepared using the fermentation process with jaggery and molasses as the carbon sources. From the prepared fertilizers; T1, T2 and T3 were selected for the pot experiment of black gram based on its final quality by using Complete Randomized Design. For carrying out the pot experiment each of the fertilizer treatments T1, T2 and T3 were diluted into three dilutions such as 0.1%, 0.2% and 0.3% respectively. The results obtained for various parameters in the fertilizer are expressed as maximum and minimum values. Physicochemical parameters including pH, nitrogen (N), phosphorus (P), potassium (K) and C/N ratio showed 4.47 to 4.41, 2.52% in T3 and 2.16% in T5; 1.06% in T3 and 0.88% in T4; 1.91% in T3 and 1.46% in T1; 19 in T1 and 16 in T5, respectively. Trace elements including Iron (Fe), Zinc (Zn), Manganese (Mn), Boron (B), Sulphur (S) and Sodium (Na) showed 9.67 mg/kg in T3 and 6.54 mg/kg in T2; 1.34 mg/kg in T1 and 0.65 mg/kg in T4; 1.64 mg/kg in T4 and 0.76 mg/kg in T2; 1.31 mg/kg in T3 and 0.79 mg/kg in T5; 0.03% in T4 and 0.01% in T2 and T5; 1.31 mg/kg in T5 and 0.69 mg/kg in T1, respectively. Microbiological parameters including Total Plate Count, Yeast and Mould Count and Lactic Acid Bacteria Count showed log 3.56 in T5 and log 3.04 in T2; log 3.21 in T3 and log 2.90 in T1; log 6.74 in T5 and log 6.17 in T1, respectively. Physicochemical changes in the parameters pH, N, P, K and C/N ratio recorded in the diluted fertilizer groups T1, T2 and T3 showed 7.05- 6.92, 2.28% in T3 (0.3%) and 0.65% in T1 (0.1%); 0.96% in T3 (0.3%) and 0.23% in T1 (0.1%); 1.56% in T3 (0.3%) and 0.43% in T1 (0.1%); 17 in T1 (0.3%) and 6 in T2 and T3 (0.1%), respectively. Post-harvest nutrient status of soil obtained for various parameters which includes pH, EC, N, P, K and organic carbon were 7.23- 6.45; 0.28- 0.43; 188 kg/ha in T3D3 and 114 kg/ha in control; 26 kg/ha in T3D3 and 14 kg/ha in control; 281 kg/ha in T3D3 and 232 kg/ha in control; 0.69% in T3D3 and 0.52% in control, respectively.
From the above results, the physicochemical characteristics in both the fertilizer treatments as well as diluted fertilizer treatments showed positive outcome in the treatment T3. Apart from that the post-harvest nutrient status of the soil also improved after the application of the diluted fertilizer treatments. The results obtained for various parameters in the pot experiment are expressed as maximum and minimum values. Growth parameters obtained for black gram includes plant height, no of leaves and length of leaves showed 32.21 cm in T3D3 and 22.34 cm in control; 31.36 in T2D3 and 21.48 in control; 15.87 cm in T3D3 and 7.89 cm in control, respectively. Chlorophyll a and b obtained showed a maximum and minimum value of 1.479 mg obtained in T2D3 and 0.956 mg obtained in control and 0.591 mg was obtained in T3D3 and 0.223 mg obtained in control, respectively. Yield parameters obtained for black gram includes shoot weight, root weight, no. of pods, pod length, no. of seeds per pod, 100 seed weight and total yield showed 8.29 g in T3D3 and 3.43 g in control; 1.68 g in T3D3 and 0.50 g in control; 15.33 in T3D3 and 6.50 in control; 9.66 cm in T2D3 and 5.15 cm in control; 11.66 in T3D3 and 4.33 in control; 4.96 g in T3D3 and 4.01 g in control; 178.74 in T3D3 and 28.14 in control, respectively.
From the above results both growth and yield parameters showed positive outcome from 0.3% dilution and among the treatments T3 has shown better results in comparison with T1, T2 and control.