Effects of lime application on selenium speciation in selenium-rich soil and selenium accumulation in sorghum in the Southwest karst region

doi:10.14088/j.cnki.issn0439-8114.2026.02.009

Abstract

Abstract: Aiming at the problem of high selenium content but low bioavailability in selenium-rich soil in the Southwest karst region, a pot experiment was conducted with treatments of no lime application (CK) and five lime application gradients (T1~T5, adding 5, 10, 20, 30, 40 g lime per 9 kg soil, respectively) to explore the effects on soil pH, selenium speciation transformation, selenium availability, and selenium uptake and accumulation in sorghum. The results showed that lime application increased soil pH, promoted the transformation of organically combined selenium to water-soluble selenium and exchangeable selenium, and increased the content of available selenium in soil. Appropriate lime application significantly enhanced the accumulation levels of selenium in sorghum roots and grains, with the maximum increase reaching 78.57% and 67.19%, respectively. Correlation analysis indicated that the content of available selenium in soil was a key factor affecting selenium uptake in sorghum, showing a strong positive correlation with selenium content in roots and grains. The selenium content in roots had a strong negative correlation with the content of organically combined selenium, while the selenium content in grains had a weak correlation with organically combined selenium. In the tested acidic selenium-rich soil, applying 20~30 g lime (per 9 kg soil) effectively improved the bioavailability of selenium and promoted selenium accumulation in crops, and in practical application, this dosage range could be referred to with adaptive adjustments based on the specific acidic characteristics of the soil.

Key words: lime, selenium-rich soil, selenium speciation, selenium accumulation in sorghum, Southwest karst region

CLC Number:

S511

GUO Shuang-yan, YOU Qian, SHU Wen, ZHANG Jun-chen, ZHANG Nan, PAN Chang-bin, PAN Zi-ping. Effects of lime application on selenium speciation in selenium-rich soil and selenium accumulation in sorghum in the Southwest karst region[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(2): 57-62.

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