Scientia Agricultura Sinica ›› 2021, Vol. 54 ›› Issue (4): 780-791.doi: 10.3864/j.issn.0578-1752.2021.04.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effects of Lime on Cadmium Accumulation of Double-Season Rice in Paddy Fields with Different Cadmium Pollution Degrees

ZHOU Liang1,2(),XIAO Feng2,3,XIAO Huan2,3,ZHANG YuSheng2,3,AO HeJun2,3()   

  1. 1College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642
    2South Regional Collaborative Innovation Center for Grain and Oil in China, Changsha 410128
    3College of Agriculture, Hunan Agricultural University, Changsha 410128
  • Received:2020-05-24 Accepted:2020-10-12 Online:2021-02-16 Published:2021-02-16
  • Contact: HeJun AO E-mail:1294786194@qq.com;aohejun@126.com

Abstract:

【Objective】The purpose of this study was to explore the effects of applicating liming in the double-season rice in paddy fields with varying degrees of cadmium pollution, and then to provide a reference for rice safety production in different polluted paddy fields with early and late rice seasons.【Method】43 typical cadmium polluted paddy fields in counties (districts) of Hunan province were used as experimental sites, and the lime was applied according to the standard of 1 200 kg·hm-2, to explore the change of four values such as soil pH, soil available Cd content, rice Cd content and rice enrichment coefficient, that were respectively researched in lightly polluted paddy fields (soil available Cd≤0.2 mg·kg-1), moderately polluted paddy fields (0.2 mg·kg-1soil available Cd≤0.4 mg·kg-1), severely polluted paddy fields (0.4 mg·kg-1soil available Cd≤0.6 mg·kg-1), and super severely polluted paddy fields (soil available Cd>0.6 mg·kg-1). The conventional cultivation was used as control.【Result】The multi-point experiment results showed that: (1) From the perspective of integral Cd polluted paddy fields, compared with conventional cultivation, the average Cd content in early and late rice was significantly reduced by applying lime, with a decrease of 31.0% and 28.6%, respectively. (2) From the perspective of different rice seasons in diverse pollution levels rice fields, the mean rice Cd content in paddy fields with moderately, severely, and seriously polluted rice fields in early rice seasons was decreased by 37.0%, 38.7% (P<0.05) and 22.6%, respectively, compared with that in conventional cultivation. Application of lime could also reduce the mean Cd content of rice in lightly, moderately, severely and super severely polluted paddy fields in late rice season by 2.0% ,31.3% (P<0.05), 31.8% and 22.9%, respectively. The lime could regulate Cd content in rice, because it could lower the Cd enrichment coefficient of rice in paddy fields with different degrees of pollution and the available Cd content in soil, ,and increase the soil pH. 【Conclusion】The application of lime could effectively control the mean Cd content of rice in the paddy fields polluted by light, moderate and severe Cd in early rice season and lightly Cd polluted paddy fields in late rice season to below the limit standard (0.2 mg·kg-1). Therefore, on the basis of lime application and in combination with other measures to reduce Cd as the main ideas of “separating the degree of pollution in rice season” and “ late rice is prior to early rice” could improve the stability of controlling rice Cd content in field production and the economy of governance costs.

Key words: lime, double-season rice, cadmium, Cd enrichment coefficient

Fig. 1

Effects of lime on cadmium content in early-season rice of the paddy fields polluted by cadmium in 43 regions The line represents Chinese National Food Safety Standards. The same as below"

Fig. 2

Effects of lime on cadmium content in late-season rice of the paddy fields polluted by cadmium in 43 regions"

Fig. 3

Effects of lime on cadmium content in double-season rice of paddy fields with different pollution degrees The lowercase letters in the figure are different, indicating significant difference between treatments (P<0.05). The same as below"

Fig. 4

Effects of lime on Cd enrichment coefficient in double-season rice of paddy fields with different pollution degrees"

Fig. 5

Effects of lime on pH of paddy soil with different cadmium pollution degrees at maturity"

Fig. 6

Effects of lime on available cadmium of paddy soil with different cadmium pollution degrees at maturity"

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