Formulasi Residu Garam Ulva sp. dengan Jeroan Ikan Cakalang sebagai Kandidat Media Slow Release/Formulation of Ulva sp. Salt Residue with Skipjack Fish Offal as a Slow Release Media Candidate

Abstract

Media slow release adalah mekanisme pelepasan unsur hara dengan efesiensi tinggi dan mengikuti pola penyerapan unsur hara oleh tanaman. Pupuk dalam bentuk slow release dapat mengoptimalkan penyerapan nitrogen oleh tanaman. Penelitian ini bertujuan menentukan formulasi pembuatan media slow release terbaik berbahan baku residu garam rumput laut Ulva sp. dengan penambahan pupuk organik cair jeroan ikan cakalang. Perlakuan pembuatan slow release fertilizer adalah 1:5 (residu garam Ulva sp. 100 g, pupuk organik cair 500 mL), 1:8 (residu garam Ulva sp. 100 g, pupuk organik cair 800 mL), dan 1:10 (residu garam Ulva sp. 100 g, pupuk organik cair 1000 mL). Penelitian ini menunjukkan slow release fertilizer mempunyai nilai C-organik berkisar 42,62%–46,22%, N berkisar 4,07%–4,82%, P2O5 berkisar 0,54%–0,79%, K2O berkisar 1,42%–1,82%, pH berkisar 5,98–6,28, dan kadar air berkisar 9–12,16%. Perlakuan 1:8 adalah hasil terbaik dengan nilai C-organik 45,4%, N 4,64%, P2O5 0,73%, K2O 1,54%, pH 5,98, dan kadar air 9,3%.

Slow release media is a mechanism for releasing nutrients efficiently and aligns with the nutrient absorption patterns of plants. Fertilizer in slow release form can optimize nitrogen absorption by plants. This research aims to determine the best slow-release media formulation made from the salt residue of Ulva sp. seaweed with the addition of liquid organic fertilizer derived from skipjack tuna innards. The slow release media treatments were 1:5 (100 g Ulva sp. salt residue, 500 mL liquid organic fertilizer), 1:8 (100 g Ulva sp. salt residue, 800 mL liquid organic fertilizer), and 1:10 (100 g Ulva sp. salt residue, 1000 mL liquid organic fertilizer). The results showed that the slow release media formulations had C-organic values ranged from 42.62% to 46.22%, N values from 4.07% to 4.82%, P2O5 values from 0.54% to 0.79%, K2O values from 1.42% to 1.82%, pH values from 5.98 to 6.28, and water content ranged from 9% to 12.16%. The 1:8 treatment yielded the best results, with a C-organic value of 45.4%, N value of 4.64%, P2O5 value of 0.73%, K2O value of 1.54%, pH of 5.98, and water content of 9.3%.