Dinamika Cadangan Karbon Tanaman Gedi (Abelmoschus manihot (L.) Medik) dengan Umur Panen yang Berbeda.

Sopfyan Badarrudin, Dr. Ir. Miftahush Shirothul Haq, S. Pt., IPM.

2026 | Skripsi | ILMU DAN INDUSTRI PETERNAKAN

Tanaman gedi (Abelmoschus manihot (L.) Medik) berpotensi sebagai agen sekuestrasi karbon. Penelitian ini bertujuan menganalisis pengaruh umur panen terhadap biomassa dan cadangan karbon gedi, serta mengembangkan dan memvalidasi persamaan allometrik berbasis tinggi tanaman sebagai metode pendugaan biomassa non-destruktif. Penelitian dilaksanakan di Kebun Koleksi Laboratorium HMT dan Pastura, Fapet UGM, menggunakan Rancangan Acak Lengkap (RAL) dengan tiga perlakuan umur panen (9, 10, dan 11 Minggu Setelah Tanam) dengan tiga ulangan total n=54. Persamaan allometrik dikembangkan melalui transformasi logaritma natural yang dievaluasi menggunakan R², RMSE, MAPE, dan uji t berpasangan. Biomassa kering meningkat dari 3,89±1,19, 5,00±1,99, hingga 5,24±1,68 ton/ha pada umur 9, 10, dan 11 MST (P = 0,596). Cadangan karbon meningkat dari 1,82±0,56 hingga 2,46±0,79 ton C/ha, setara penyerapan CO² sebesar 6,71 hingga 9,03 ton/ha. Persamaan allometrik B = 0,0001368 × H1,4486 menghasilkan R² = 0,757, MAPE = 11,29% (< 20 xss=removed xss=removed>

Gedi (Abelmoschus manihot (L.) Medik), a tropical herbaceous plant with rapid vegetative growth, is a promising carbon sequestration agent however, the effect of harvest age on its biomass and carbon stock accumulation remains insufficiently studied. This study aimed to analyse the effect of harvest age on biomass and carbon stock of gedi, and to develop and validate a plant-height-based allometric equation for non-destructive biomass estimation. The study was conducted at the Forage Plant Collection Garden, Faculty of Animal Science, Universitas Gadjah Mada, using a Completely Randomised Design (CRD) with three harvest age treatments (9, 10, and 11 weeks after planting/WAP) and three replications, and total n=54. Allometric equation was developed through natural-log transformation and evaluated using R², RMSE, MAPE, and a paired t-test. Dry biomass increased consistently 3,89±1,19, 5,00±1,99, to 5,24±1,68 ha/t at 9, 10, and 11 WAP, although differences among treatments were not statistically significant (P = 0,596). Carbon stock increased from 1,82±0,56 to 2,46±0,79 t C/ha, equivalent to CO² sequestration of 6,71 to 9,03 t/ha. The developed allometric equation, B = 0.0001368 × H1,4486, yielded R² = 0.757, MAPE = 11.29% (< 20 xss=removed>

Kata Kunci : allometrik, biomassa, cadangan karbon, gedi, umur panen