E3S Web Conf.
Volume 68, 2018The 1st Sriwijaya International Conference on Environmental Issues 2018 (1st SRICOENV 2018)
|Number of page(s)||9|
|Section||Promoting Environment System|
|Published online||27 November 2018|
Bioavailability of Silica on Paddy Soils with Various Land Aging in Musi Rawas South Sumatera of Indonesia
1 Ph.D. Student Environmental Science Program of Universitas Sriwijaya, Indonesia
2 Agriculture Faculty, University of Musi Rawas South Sumatera, Indonesia
3 Posy Graduate Studies of Environmental Sciences of Universitas Sriwijaya, Indonesia
* Corresponding author: firstname.lastname@example.org
Utilization of intensive paddy soils for rice cultivation are main causing deficiency of soil silica (Si) due to high concentration Si adsorption in soils with values varies between 230 up to 470 kg ha-1. The soil silica availability on agriculture lands in Indonesia varies from 203 to 982 mg kg-1, and the paddy soils in Java and Sumatra have shown a decreasing the silica between 11% to 20% in the last three decades, resulting in declining paddy soils productivity. This study was aimed to investigate the availability of silica in the paddy soils distributed in Musi Rawas. The study was scheduled from May to November 2016 using survey methods, and soil analyzes performed in laboratory of SEAMEO Biotrop Bogor.The results showed that availability of silica in wetland has reduced by 50% in two decades, and meanwhile the availability of silica in irrigated soils about 7.5 times lower compared to rainfed soils. The silica availability of irrigated soils from wetland had 4.5 times higher than the irrigated soils of dryland. Furthermore, silica contained in rice husk had also decreased down to 74.5%, resulting in the decreasing of grain production due to a decrease in availability of silica in soil.
© The Authors, published by EDP Sciences, 2018
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