Pedosphere 14(1): 111--116, 2004
ISSN 1002-0160/CN 32-1315/P
©2004 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Soil manganese and iron released due to calcium salts: Bioavailability to pepper(Capsicum frutescenes L.) |
SI You-Bin1,2 , ZHOU Jing2, ZHOU Dong-Mei2 and CHEN Huai-Man2 |
1 Department of Plant Protection, Anhui Agricultural University, Hefei 230036 (China). E-mail: youbinsi@21cn.com
2 Institute of Soil Science, Chinese Academy of Sciences, P. C. Box 821, Nanajing 210008 (China) |
| ABSTRACT |
| Releases of manganese and iron ions from an albic soil (Albic-Udic Luvisol), a yellow-red soil (Hap-Udic Ferrisol) and a yellow-brown soil (Arp-Udic Luvisol) induced by calcium salt addition and their bioavailability to pepper (Capsicum frutescens L.) were studied in a pot experiment. Addition of Ca(NO3)2 decreased soil pH and increased both exchangeable and DTPA (diethylenetriamine pentaacetic acid)-extractable Mn and Fe in soils. Meanwhile, total Mn accumulation in the shoots of Capsicum frutescens L. on the salt-treated soils increased significantly (P< 0.01) compared with the control, suggesting that salt addition to soil induced Mn toxicity in Capsicum frutescens L. Although exchangeable and DTPA-extractable Fe increased also in the salt-treated soils, Fe uptake by the shoots of Capsicum frutescens L. decreased. The effect of added salts in soils on dry matter weight of pepper varied with the soil characteristics, showing different buffer capacities of the soils for salt toxicity in an order of yellow-brown soil > albic soil > yellow-red soil. Fe/Mn ratio in shoots of Capsicum frutescens L. decreased with increasing salt addition for all the soils, which was ascribed to the antagonistic effect of Mn on Fe accumulation. The ratio of Fe/Mn in the tissue was a better indicator of the appearance of Mn toxicity symptoms than Mn concentration alone. |
| Key Words: bioavailability, Capsicum frutescens L., iron, manganese, salt toxicity |
| Citation: Si, Y. B., Zhou, J., Zhou, D. M. and Chen, H. M. 2004. Soil manganese and iron released due to calcium salts: Bioavailability to pepper(Capsicum frutescenes L.). Pedosphere. 14(1): 111-116. |
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