Details
| Original language | English |
|---|---|
| Pages (from-to) | 1354-1369 |
| Number of pages | 16 |
| Journal | Archives of Agronomy and Soil Science |
| Volume | 65 |
| Issue number | 10 |
| Early online date | 10 Jan 2019 |
| Publication status | Published - 24 Aug 2019 |
Abstract
Rice straw contains up to 2.3% K in dry matter, including potassium (K) subcompartmented in phytoliths, complex siliceous structures formed in plant tissue via precipitation of Si. Rice straw is usually returned to the soil as a conventional practice to sustain soil nutrients, and therefore, the K pool accompanied with rice straw phytoliths is also cycled. Based on phytoliths obtained by ashing of rice straw at 400 °C and dissolution experiments using batch extraction in combination with physical separation of phytoliths by heavy liquid, this study evaluated the phytolith K(phytK) pool in rice straw and aged phytoliths in paddy soils. Entrapped organic matter containing K within phytolith silica cells was visualized by X-ray tomographic microscopy, and releases of this phytK pool accompanying phytolith dissolution were quantified. A 1% Na2CO3 solution, which has been commonly used to extract amorphous Si and to quantify soil phytoliths, showed obvious responses for K derived from phytolith dissolution, indicating that the Na2CO3 method can be developed for measurement of phytK. In 13 soil samples, Na2CO3-dissolvable K content assignable to phytK was 0.55 ± 0.39 g kg−1 in the puddled horizon, suggesting the phytK pool is of high significance for the management of K in paddy soils.
Keywords
- paddy soil, Phytolith, potassium storage, rice straw
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
- Agricultural and Biological Sciences(all)
- Soil Science
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Archives of Agronomy and Soil Science, Vol. 65, No. 10, 24.08.2019, p. 1354-1369.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Characterization and implication of phytolith-associated potassium in rice straw and paddy soils
AU - Nguyen, Huan X.
AU - Nguyen, Van Thanh A.
AU - Tran, Chinh T.
AU - Nguyen, Anh T.Q.
AU - Nguyen-Thanh, Lan
AU - Bui, Anh T.K.
AU - Dultz, Stefan
AU - Wu, Ta Yeong
AU - Nguyen, Minh N.
N1 - Funding information: The Vietnam National University, Hanoi (VNU) under project number QG.17.22 funded this research. X-ray tomographic microscopy was performed at the TOMCAT beamline of the synchrotron facility of the Paul Scherrer Institute, Villigen, Switzerland. The great help of Sarah B. Cichy for the morphological characterization of phytoliths from the tomographic data set is acknowledged.
PY - 2019/8/24
Y1 - 2019/8/24
N2 - Rice straw contains up to 2.3% K in dry matter, including potassium (K) subcompartmented in phytoliths, complex siliceous structures formed in plant tissue via precipitation of Si. Rice straw is usually returned to the soil as a conventional practice to sustain soil nutrients, and therefore, the K pool accompanied with rice straw phytoliths is also cycled. Based on phytoliths obtained by ashing of rice straw at 400 °C and dissolution experiments using batch extraction in combination with physical separation of phytoliths by heavy liquid, this study evaluated the phytolith K(phytK) pool in rice straw and aged phytoliths in paddy soils. Entrapped organic matter containing K within phytolith silica cells was visualized by X-ray tomographic microscopy, and releases of this phytK pool accompanying phytolith dissolution were quantified. A 1% Na2CO3 solution, which has been commonly used to extract amorphous Si and to quantify soil phytoliths, showed obvious responses for K derived from phytolith dissolution, indicating that the Na2CO3 method can be developed for measurement of phytK. In 13 soil samples, Na2CO3-dissolvable K content assignable to phytK was 0.55 ± 0.39 g kg−1 in the puddled horizon, suggesting the phytK pool is of high significance for the management of K in paddy soils.
AB - Rice straw contains up to 2.3% K in dry matter, including potassium (K) subcompartmented in phytoliths, complex siliceous structures formed in plant tissue via precipitation of Si. Rice straw is usually returned to the soil as a conventional practice to sustain soil nutrients, and therefore, the K pool accompanied with rice straw phytoliths is also cycled. Based on phytoliths obtained by ashing of rice straw at 400 °C and dissolution experiments using batch extraction in combination with physical separation of phytoliths by heavy liquid, this study evaluated the phytolith K(phytK) pool in rice straw and aged phytoliths in paddy soils. Entrapped organic matter containing K within phytolith silica cells was visualized by X-ray tomographic microscopy, and releases of this phytK pool accompanying phytolith dissolution were quantified. A 1% Na2CO3 solution, which has been commonly used to extract amorphous Si and to quantify soil phytoliths, showed obvious responses for K derived from phytolith dissolution, indicating that the Na2CO3 method can be developed for measurement of phytK. In 13 soil samples, Na2CO3-dissolvable K content assignable to phytK was 0.55 ± 0.39 g kg−1 in the puddled horizon, suggesting the phytK pool is of high significance for the management of K in paddy soils.
KW - paddy soil
KW - Phytolith
KW - potassium storage
KW - rice straw
UR - http://www.scopus.com/inward/record.url?scp=85059914475&partnerID=8YFLogxK
U2 - 10.1080/03650340.2018.1564908
DO - 10.1080/03650340.2018.1564908
M3 - Article
AN - SCOPUS:85059914475
VL - 65
SP - 1354
EP - 1369
JO - Archives of Agronomy and Soil Science
JF - Archives of Agronomy and Soil Science
SN - 0365-0340
IS - 10
ER -