Evaluation of available silicate content and its determining factors in the soils of sugarcane fields in Okinawa, Japan

DOI JASI Web Site 1 Citations
  • Yanai Junta
    Graduate School of Life and Environmental Sciences, Kyoto Prefectural University
  • Noguchi Natsumi
    Faculty of Life and Environmental Sciences, Kyoto Prefectural University
  • Miyamaru Naoko
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology Okinawa Prefectural Agricultural Research Center
  • Nakao Atsushi
    Graduate School of Life and Environmental Sciences, Kyoto Prefectural University

Bibliographic Information

Other Title
  • 沖縄県のサトウキビ畑土壌における可給態ケイ酸の定量評価とその規定要因の解析
  • オキナワケン ノ サトウキビバタケ ドジョウ ニ オケル カキュウタイ ケイサン ノ テイリョウ ヒョウカ ト ソノ キテイ ヨウイン ノ カイセキ

Search this article

Description

<p>Silicon is a beneficial element for Gramineae plants and is expected to increase the growth and yield of sugarcane (Saccharum officinarum), which is one of the main agricultural products in Okinawa. To evaluate the available silicate (SiO2) content and investigate the determining factors behind its presence in the soils of sugarcane fields in Okinawa, we collected 120 soil samples from the surface layer of sugarcane fields (35 Kunigami-mahji (Udults), 50 Shimajiri-mahji (Udalfs), 25 Jahgaru (Orthents), and 10 Daito-mahji (Udults)) and determined their available SiO2 contents. A phosphate buffer (0.04 M, pH 6.2) was used to extract the available SiO2 from the soil samples; furthermore, the SiO2 concentrations in the extracts were determined using a colorimetric method. Selected physicochemical properties, such as pH, the oxalate extractable Fe (Feo), Al (Alo), and Si (Sio), and organic carbon content were also determined for the soil samples.</p><p>The averages of the available silicate contents (mg SiO2 kg−1) were found to be 584, 398, 263, and 148 for Jahgaru, Shimajiri-mahji, Daito-mahji, and Kunigami-mahji, respectively. Around half of the samples, mainly those from Kunigami-mahji and Daito-mahji, were estimated to be SiO2 deficient. The overall available SiO2 contents correlated positively with the pH, Feo, and organic C content, and negatively with the sand content (p<0.01). Multi-regression analysis further indicated that the pH, presence of amorphous Fe oxide, and organic matter content were the dominant determining factors, and these three variables explained 78％ of the variation in the available SiO2 content. In conclusion, the available SiO2 content and the determining factors behind its presence in the soils of sugarcane fields in Okinawa were quantitatively elucidated, and these results will contribute to the establishment of rational soil management, including the application of silicate materials by considering the Si-supplying power of the relevant soils, for sustainable and high-yielding sugarcane production in Okinawa, Japan.</p>

Journal

Citations (1)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top