Pengaruh Penambahan Jeroan Ikan Tongkol (Euthynnus affinis) dan Residu Garam Sea Lettuce pada Pupuk Slow Release

Abstract

Jeroan ikan tongkol dan residu garam sea lettuce bernilai ekonomis dan ramah lingkungan, serta kaya akan unsur hara jika dimanfaatkan kembali menjadi pupuk slow release. Penelitian bertujuan menentukan rasio terbaik pupuk slow release dari residu garam sea lettuce dan pupuk organik cair jeroan ikan tongkol, berdasarkan hasil uji unsur hara, serta struktur morfologi dan pelepasan nitrogen berdasarkan perlakuan terbaik. Penelitian terdiri dari 3 formulasi yaitu A1 (1:5), A2 (1:8), dan A3 (1:10), dengan tiga kali pengulangan. Hasil uji pupuk organik cair yaitu C-organik 1,27%; N-total 0,40%; P2O5 0,08%; K2O 0,17%; dan pH 4,06. Hasil uji pupuk slow release tiap perlakuan yaitu C-organik 50,06%, 47,77%, dan 48,04%; N-total 2,64%, 2,87%, dan 3,04%; P2O5 0,41%, 0,54%, dan 0,62%; K2O 1,70%, 1,77%, dan 2,09%; pH 6,18, 5,85, dan 5,25; serta kadar air 7,67%, 8,60%, dan 8,95%; dengan perlakuan terbaik pada A3 dengan karakteristik bentuk granul, tekstur kasar, dan sedikit aroma pupuk organik cair. Analisis pelepasan nitrogen menunjukkan hasil 33,99% nitrogen yang terlepas pada hari ke-20, dengan struktur berpori dan amorf.

Mackerel tuna viscera and sea lettuce salt residue are economically valuable, environmentally friendly, and rich in nutrients when reutilized as slow release fertilizer. This study aimed to determine the best ratio of slow release fertilizer from sea lettuce salt residue and liquid organic fertilizer from mackerel tuna viscera, based on nutrient content analysis, as well as morphological structure and nitrogen release based on the best treatment. The experiment consisted of three formulations, A1 (1:5), A2 (1:8), and A3 (1:10), with three replications. The analysis of liquid organic fertilizer showed 1.27% of organic carbon, 0.40% of total nitrogen, 0,08% of P2O5, 0.17% of K2O, and 4.06 of pH. The results of slow release fertilizer analysis for each treatments were 50.06%, 47.77%, and 48,04% of organic carbon, 2.64%, 2.87%, and 3.04% of total nitrogen, 0.41%, 0.54%, and 0.62% of P2O5, 1.70%, 1.77%, and 2.09% of K2O, 6.18, 5.85, and 5.25 of pH, and 7.67%, 8.60%, and 8.95% of moisture content, with the best treatment found in A3 with the characteristics of granular form, rough texture, and a slight odor of liquid organic fertilizer. Nitrogen release analysis showed 33.99% of nitrogen released on day 20, with a porous and amorphous structure.