Abstract
Application of peatland amelioration can improve soil quality, reduce GHG emissions, and increase carbon sequestration. The research aimed to study the effect of peatland amelioration on oil palm and rubber carbon stock improvement. Research was conducted from August 2013 until June 2014. The researches on oil palm were done in Arang-arang Village, Kumpeh Subdistrict, Muaro Jambi District, and in Lubuk Ogong Village, Bandar Seikijang Sub-district, Pelalawan District. Both sites are in Jambi and Riau Province. The research on rubber was done in Jabiren Village, Jabiren Raya Subdistrict, Pulang Pisau District, Central Kalimantan Province. The study used a Randomized Completely Block Design (RCBD), in four treatments and four replications. The treatments were pugam (peat fertilizer enriched by polyvalent cation), manure; empty fruit bunch compost, and control (no application). The measurement of C stock was performed 10 months after application using nondestructive methods. The results showed that peatland amelioration treatments had no significant effect to improve C stock on oil palm in 6 years old and 7 years old of rubber. After 10 months of amelioration application, the treatments increased C - stock of oil palm and rubber were 2.1-2.4 Mg ha-1 and 5-11 Mg ha-1, respectively. Longer time observation may be needed to study the effect of ameliorant on C-stock of annual crops.
Highlights
An increase of agricultural food consumption has lead to an increase of intensive agricultural practices
The objectives of the research were to compare the quality of physical and chemical characteristics of the soils in the oil palm plantations applied with integrated farming system of cattle and oil palm plantation (IFSCO) and without IFSCO, as well as to evaluate the economic benefits of IFSCO application
The results showed that the application of organic fertilizer in the IFSCO field resulted in higher level of exchangeable-K, -Ca, -Mg, and -Na, cation exchange capacity (CEC), and organic-C content of the soil;and better improvement on the physical soil quality, i.e. bulk density, porosity and soil moisture content; in comparison to that in the field without organic fertilizer application
Summary
An increase of agricultural food consumption has lead to an increase of intensive agricultural practices. Farmers depend largely on the use of chemical fertilizers to sustain their agricultural productions an excessive chemical fertilizer use without adding organic fertilizers and applying soil consevation practices would lead to a decrease of soil productivity. This phenomenon is in line with the study of Dinata (2012), Dharmayanti et al (2013), Uphoff (2006) and Lestari (2009), which showed that application of inorganic fertilizers continually would lead to a decrease of soil quality
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