Methane flux from high-yielding Inpari rice varieties in Central Java, Indonesia

Abstract

<p>Rice cultivation is a source of greenhouse gas emissions, particularly methane (CH<sub>4</sub>). One of the factors that affect CH<sub>4</sub> emissions from rice fields is rice cultivar. In this study, a field experiment was conducted to determine CH<sub>4</sub> emissions from various high-yielding inbred varieties and the relationship between CH<sub>4</sub> emissions and rice growth parameters. The field experiment was conducted in Jaken, Pati Regency, Central Java province, during the wet season of 2014/2015. The experiment was arranged using a randomized block design with three replications and several cultivar treatments (Inpari 13, 18, 19, 20, 23, 24, 29, 30, 31, 32, and 33, with Ciherang as the comparison cultivar). The data collected includes CH<sub>4</sub> flux, plant height, tiller number, biomass, grain yield, and root aerenchyma area. The CH<sub>4</sub> flux was measured at several critical growth stages. The Inpari 24, Inpari 13, and Inpari 19 demonstrated CH<sub>4</sub> emissions reduced by as much as 36.1%, 32.8%, and 21.3%, respectively, compared to Ciherang. The Inpari 13 and Inpari 24 varieties had significantly lower emission indices than Ciherang and the other Inpari varieties, with 17 and 20 g CH<sub>4</sub> per 1 kg grain yield, respectively. CH<sub>4</sub> flux was found to correlate significantly with tiller number per hill, total biomass, and root aerenchyma area at the panicle initiation growth stage.</p>

Padi Walik Jerami: Kearifan Lokal Adaptasi Kekeringan pada Lahan Sawah Tadah Hujan

“…Indeks emisi menggambarkan volume emisi GRK melalui tanaman padi untuk setiap kg atau ton gabah yang dihasilkan (Mulyadi & Wihardjaka, 2014). Indeks emisi dihitung dari pembagian antara emisi GRK dan hasil gabah (Wihardjaka, Yulianingsih, & Yulianingrum, 2020). Misalnya, indeks emisi dari varietas Dodokan sebesar 0,017 kg CH4/kg gabah, artinya setiap 1 kg gabah dilepaskan/diemisikan metana sebesar 17 g CH4 (Tabel 3.3).…”