The Influence Compost Combined with Agroindustrial Waste on Soil Improvement, Paddy Growth, and Gas Emissions in Tidal Lands

Abstract

Application of local organic matter is expected to be able to minimize soil biogeochemical constraints and increase rice yields but it could also be a source of greenhouse gases such as CH₄, and CO₂ from tidal swamp paddy fields. Agroindustrial wastes have the potentials to be combined with the local organic matter to reduce crude fiber content of the local organic matter. This study aimed to compare the effects type organic of compost combined with agroindustrial solid wastes on improving soil properties, increasing paddy growth and reducing greenhouse gas emissions. This research was conducted at Polytechnic Hasnur’s greenhouse from November 2020 to July 2021 using a nested completely randomized design with Tukey’s HSD test at the a 5%, with the treatments are  paddy straw compost, oil palm empty fruit bunch compost, and compost of “purun tikus” (Eleocharis dulcis), each of which  253.7 g combined with 126.8 g of crumb rubber solid waste or 126.8 g of solid decanter on applied in 15 kg of tidal swamp mineral soil. There were 6 combinations and 1 control which was repeated 5 times to make 35 experimental units. The variables observed were plant height, number of productive tillers, root volume, percentage of pyrite, soil bulk density, methane flux, and carbon dioxide flux. In 15 kg of tidal swamp mineral soil applied 253.7 g paddy straw compost, combined with 126.8 g of solid decanter increased plant height, decreased soil bulk density and CH₄ flux at 60 and 90 DAP. Application of 253.7 g of straw compost combined with 126.8 g of crumb rubber waste applied in 15 kg tidal swamp mineral soil increased number of tillers, root volume, and decreased pyrite. Application 253.7 g compost of purun tikus combined with 126.8 g crumb rubber solid waste applied in 15 kg tidal swamp mineral soil was able to reduce CO₂ flux 60 DAP.