Soil Manganese and Iron Released due to Calcium Salts: Bioavailability to Pepper （Capsicum frutescens L.）English Full Text

SI You-Bin, ZHOU Jing, ZHOU Dong-Mei and CHEN Huai-Man 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. O. Box 821, Nanjing 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.

Keywords：

bioavailability; Capsicum frutescens L.; iron; manganese; salt toxicity;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Soil Manganese and Iron Released due to Calcium Salts: Bioavailability to Pepper （Capsicum frutescens L.）English Full Text

SI You-Bin, ZHOU Jing, ZHOU Dong-Mei and CHEN Huai-Man 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. O. Box 821, Nanjing 210008 (China)

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