Abstract
Biochar improves soil quality physicochemical. Biochar is a soil amendment created through the burning of biomass, has a potential solution for wide-ranging environmental management problems. Biochar has been shown to have positive outcomes on soil function to sequester carbon to slow the effects of global climate change. The objective of this research was to study the impact of compost biochar in increasing rice yields in tropical swampland. The design used in this study was a randomized block design, including (1) biochom 1 (without harvest waste compost + without biochar rice husk), (2) Biochom 2 (harvest waste compost 5 t/ha), (3) biochom 3 (rice husk biochar 5 t/ha), (4) biochom 4 (a combination of harvest waste compost 2.5 t/ ha + rice husk biochar 2.5 t/ha). The results showed that application of biochom 4 (a combination of harvest waste compost 2.5 t/ha + rice husk biochar 2.5 t/ha) increased of rice yield reached 15.21% compared to biochom 2 treatment (compost harvest waste 5 t/ha) and reached 17.78% with biochom 3 treatment (rice husk biochar 5 t/ha), compost without biochar treatment.
Highlights
Indonesia has the most abundant swampland in the tropics with sediment consisting of mineral soil, peat soils, or a combination of both
Of the total area of swampland in Indonesia, around 19.99 million ha is a potential land that can be used as agricultural land, while the remaining 14.93 million ha is not possible to be developed into agricultural land [1]
Acid sulfate soils are often found in coastal areas that are still affected by tides with high iron content, so it is very acidic [2]
Summary
Indonesia has the most abundant swampland in the tropics with sediment consisting of mineral soil, peat soils, or a combination of both. The characteristic of acid sulfate soils is the presence of sulfuric horizons which generally contain large amounts of iron which causes soil pH to decrease to ≤ 3 [3,4]. Land under these conditions is classified into an actual acid sulfate soils with the Entisol order [5,6]. Sulfide minerals such as pyrite and sulfur elements resulting from the sulfur sediment reduction process are elements forming acid sulfate soils that are oxidized when pyrite is exposed to the surface due to drainage or earth movement [7]
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