caa a22 4500 606220356 CHVBK 20210128101123.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s11104-015-2480-y doi (NATIONALLICENCE)springer-10.1007/s11104-015-2480-y Forms and fluxes of potential plant-available silicon in irrigated lowland rice production (Laguna, the Philippines) [Elektronische Daten] [T. Klotzbücher, F. Leuther, A. Marxen, D. Vetterlein, F. Horgan, R. Jahn] Background and aims: Silicon (Si) is beneficial for rice plants. It increases their resistance against pests and diseases. Although Si uptake of rice crops is often higher than nitrogen uptake, studies on forms and fluxes of plant-available Si in paddy systems are scarce. Methods: In 2011/12 we assessed acetate-, oxalate-, and carbonate-extractable Si in topsoil (i.e., Si forms that contribute to the pool of ‘readily soluble Si') and related them to plant-Si-uptake (n = 10 paddies; Laguna region; Philippines). In the wet season 2013, we determined changes in (i) plant-Si-uptake, (ii) dissolved Si (dSi) and (iii) acetate-extractable Si in topsoils in a high temporal resolution (n = 5 paddies, every ~10days), and assessed dSi fluxes via irrigation, rain, drainage and percolation (n = 3 paddies). Results: Si storage in plants at harvest was 0.73 ± 0.12Mgha−1 (>78% in straw), and not related to different Si forms in topsoils. Large stocks of carbonate-extractable Si (2-29Mgha−1) suggest an accumulation of ‘phytoliths' (amorphous Si oxides in straw) in topsoil due to irrigation. Acetate-extractable Si in topsoils hardly changed during plant growth, suggesting dSi and absorded Si was continuously contributed by irrigation and phytolith dissolution. Conclusions: Geo-/pedologic conditions, irrigation, and straw management are major determinants on Si storage and fluxes in irrigated rice paddies. Springer International Publishing Switzerland, 2015 Silicon nationallicence Rice nationallicence Paddy fields nationallicence Philippines nationallicence Water management nationallicence Straw management nationallicence Klotzbücher T. Institute of Agricultural and Nutritional Sciences - Soil Science, University of Halle, Von-Seckendorff-Platz 3, 06120, Halle (Saale), Germany aut Leuther F. Institute of Agricultural and Nutritional Sciences - Soil Science, University of Halle, Von-Seckendorff-Platz 3, 06120, Halle (Saale), Germany aut Marxen A. Department of Soil Physics, Helmholtz Centre for Environmental Research GmbH - UFZ, Theodor-Lieser-Straße 4, 06120, Halle (Saale), Germany aut Vetterlein D. Department of Soil Physics, Helmholtz Centre for Environmental Research GmbH - UFZ, Theodor-Lieser-Straße 4, 06120, Halle (Saale), Germany aut Horgan F. International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines aut Jahn R. Institute of Agricultural and Nutritional Sciences - Soil Science, University of Halle, Von-Seckendorff-Platz 3, 06120, Halle (Saale), Germany aut Plant and Soil Springer International Publishing 393/1-2(2015-08-01), 177-191 0032-079X 393:1-2<177 2015 393 11104 https://doi.org/10.1007/s11104-015-2480-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2480-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Klotzbücher T. Institute of Agricultural and Nutritional Sciences - Soil Science, University of Halle, Von-Seckendorff-Platz 3, 06120, Halle (Saale), Germany aut NATIONALLICENCE 700 1- Leuther F. Institute of Agricultural and Nutritional Sciences - Soil Science, University of Halle, Von-Seckendorff-Platz 3, 06120, Halle (Saale), Germany aut NATIONALLICENCE 700 1- Marxen A. Department of Soil Physics, Helmholtz Centre for Environmental Research GmbH - UFZ, Theodor-Lieser-Straße 4, 06120, Halle (Saale), Germany aut NATIONALLICENCE 700 1- Vetterlein D. Department of Soil Physics, Helmholtz Centre for Environmental Research GmbH - UFZ, Theodor-Lieser-Straße 4, 06120, Halle (Saale), Germany aut NATIONALLICENCE 700 1- Horgan F. International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines aut NATIONALLICENCE 700 1- Jahn R. Institute of Agricultural and Nutritional Sciences - Soil Science, University of Halle, Von-Seckendorff-Platz 3, 06120, Halle (Saale), Germany aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 393/1-2(2015-08-01), 177-191 0032-079X 393:1-2<177 2015 393 11104