Denitrification Decomposition (DNDC) Model for Estimation CH4 Emissions in Rice Cultivation through SRI Method

Badi'atun Nihayah; Bayu Dwi Apri Nugroho; Nur Aini Iswati Hasanah

doi:10.29303/jrpb.v10i1.278

Model Denitrification Decomposition (DNDC) untuk Estimasi Emisi Gas CH4 Pada Budidaya Padi Metode SRI

Authors

Badi'atun Nihayah , Bayu Dwi Apri Nugroho , Nur Aini Iswati Hasanah

DOI:

10.29303/jrpb.v10i1.278

Published:

2022-03-24

Issue:

Vol. 10 No. 1 (2022): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem

Keywords:

emisi CH4, model DNDC, padi, pupuk, System of Rice Intensification

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Nihayah, B., Nugroho, B. D. A., & Hasanah, N. A. I. (2022). Model Denitrification Decomposition (DNDC) untuk Estimasi Emisi Gas CH4 Pada Budidaya Padi Metode SRI. Jurnal Ilmiah Rekayasa Pertanian Dan Biosistem, 10(1), 116–128. https://doi.org/10.29303/jrpb.v10i1.278

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Abstract

Budidaya padi merupakan salah satu sektor pertanian yang menyumbang emisi gas rumah kaca terutama CH₄. Upaya penurunan emisi gas CH₄ pada penelitian ini dilakukan dengan mengintegrasikan komponen teknologi antara varietas, penggunaan pupuk dan irigasi berselang melalui metode budidaya System of Rice Intensification. Penelitian ini bertujuan untuk mengetahui pengaruh varietas dan pemupukan terhadap emisi gas CH₄ selama satu musim tanam serta melakukan pemodelan simulasi untuk estimasi emisi CH₄. Model yang digunakan adalah Denitrification-Decomposition (DNDC) berdasarkan parameter data input kondisi iklim, sifat tanah dan praktik manajemen pertanian (termasuk pemupukan, irigasi, pengolahan tanah, produksi biomassa). Rancangan yang digunakan adalah Nested Design dengan dua faktor perlakuan, yaitu pemupukan yang terdiri dari 1) Pupuk kandang dan MOL (P1); 2) Pupuk kandang, ZA, SP36 dan KCl (P2); dan perlakuan varietas 1) Ciherang dan 2) IR-64. Hasil observasi menunjukkan bahwa perlakuan pemupukan P2-C menghasilkan total emisi CH₄ 13,41% lebih rendah daripada P1-C dan perlakuan P2-IR 39,43% dibanding P1-IR. Begitu pula hasil simulasi DNDC yang menunjukkan bahwa perlakuan pemupukan (P2) menghasilkan total emisi CH4 dari kedua varietas, yaitu Ciherang 53,57% dan IR-64 sebesar 58,74% lebih rendah dibanding pemupukan (P1). Evaluasi model antara hasil observasi dan simulasi DNDC menunjukkan nilai R² dan RMSE setiap perlakuan, yaitu P1-C; P1-IR; P2-C dan P2-IR berturut-turut sebesar (R² = 0,65; RMSE = 13,19); (R² = 0,003; RMSE = 3,55); (R² = 0,17; RMSE = 32,06) dan (R² = 0,35; RMSE = 12,25). Sehingga dapat dikatakan bahwa hasil simulasi DNDC belum cukup memuaskan dan dibutuhkan kalibrasi.

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Model Denitrification Decomposition (DNDC) untuk Estimasi Emisi Gas CH4 Pada Budidaya Padi Metode SRI

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