期刊
SOIL & TILLAGE RESEARCH
卷 171, 期 -, 页码 19-24出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.still.2017.04.002
关键词
Rice straw; Phytolith; Phosphorus
类别
资金
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [105.09-2015.01]
Silicon (Si) is assimilated from soil by rice and is deposited in shoots in inter- and intracellularly, resulting in the formation of silicaceous structures, namely phytoliths. During the precipitation of Si, elements present in xylem/phloem sap, including phosphorus (P), can also be occluded in the phytolith. We examined the release of Si and P from the rice straw derived phytolith to elaborate the desilification mechanism, and the potential effects of phytolith as a nutrient ammendment. Data from batch heating experiments revealed that P trapped in the phytolith structure could be released accompanying with the dissolution of the phytolith. The highest values of soluble Si and P were found in the range of 500-700 degrees C. The chemical composition, X-ray diffraction, infrared spectra and specific surface area (SSA) data suggested that the presence of occluded organic carbon at < 500 degrees C and crystallization of silica at > 700 degrees C were the main reasons for lower dissolution rates of phytolith and decreasing P release. With respect to practices of burning rice straw, it can be recommended that treatment temperature needs to be taken into account to maximize P release for crops.
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