CARBON EMISSION AND RESPONS OF RICE TO APPLICATTON OF AMELIORANT DREGS IN THE PEAT SOIL WITH SATURATION AND UNSATURATION

Abstract

Fertility of peat land is very poor and makes it not suitable for crop wiihout any high input. This condition was indicated by the very high soil's acidity (low pH), low availability of macro (N, P, K, Ca and Mg), and micro (Cu, Zn, Mn and Bo) nutriens and high cation exchange capacity (CEC) but low base saturation (BS), the presence of toxic organic acid. The main organic acids, as a result of lignin biodegradation and the sources of C-release, are of aromatic group consisting mainly of derivate phenolic acids. This research was conducted in a green house. The peat soil was taken at depths from 0 to 30 cm, with weathering rate saprik and dregs from dregs from pulp and paper industry at Kerinci,, Pelalawan, Riau. This reseach used split-plot design, activities were focused on the interaction of ameliorant dregs and water condition (saturation and unsaturation) and its influences to rice yield and C-emission (CO2 and CH). The application of dregs at the dose 20 t ha -1 decreased the CO2 and CH4 production of about 16.5% and l3.7 % respectively at saturation and about 9.9%o and 91.0 % respectively at.unsaturation compared to without ameliorant. The application of dregs 10 to 20 t ha-1 increased plant height, maximum tiller number, number of productive tillers and weight of dry straw and milled dry grain of rice IR-64. The weight of dry straw and milled dry grain increased about 110 to 210% and 75 to 174% respectively at saturalion and 59 to 92 to % and 52 to 80% respectively at unsaturation compare to without ameliorant.