Effects of foliar conditioners on safety production of main rice varieties in cadmium-contaminated farmland in eastern Zhejiang Province

doi:10.3785/j.issn.1008-9209.2021.02.151

Journal of Zhejiang University (Agriculture and Life Sciences)

2021, Vol. 47

Issue (6): 768-776 DOI: 10.3785/j.issn.1008-9209.2021.02.151

Resource utilization & environmental protection

Effects of foliar conditioners on safety production of main rice varieties in cadmium-contaminated farmland in eastern Zhejiang Province

Qiyao ZHOU¹(

),Yuanjun NI²(

),Shun’an XU¹,Qiong WANG¹,Lichuan ZHAN²,Ying FENG¹(

)

^1.Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
^2.Shengzhou Agricultural Technology Extension Center, Shaoxing 310024, Zhejiang, China

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Abstract

Application of foliar conditioner is an important technical measure to reduce the contents of heavy metals in edible parts of crops and realize the safe utilization of moderately and slightly polluted farmlands. In this study, the effects of different ion antagonistic foliar conditioners and the optimal conditioner on the safety of rice production were compared through two consecutive years of field experiments. The field plot experiment results showed that five kinds of foliar conditioners had obvious effects on reducing cadmium (Cd) content and increasing yield in the two sites, among which spraying multiple compound foliar conditioner had the best effect on reducing Cd content in rice, and Cd contents in the brown rice in two sites decreased by 13.0% and 14.5%, respectively. Furthermore, the effects of foliar application of the multiple compound conditioner on rice yields and Cd contents of seven main rice varieties in eastern Zhejiang Province were compared through regional experiments. The results showed that the foliar application of multiple compound conditioner could increase rice yield by 8.2%-10.8% and decrease Cd content of the brown rice by 15.7%-20.3%. Among them, YY17 combined with the foliar application of multiple compound conditioner had the lowest Cd content in the brown rice. These results indicate that the combination of low accumulation varieties and the selected multiple compound conditioner could effectively reduce the Cd content in brown rice, achieve the safe utilization of farmland with slight Cd pollution, and promote the yield and efficiency of rice production.

Key words： heavy metal foliar fertilizer field experiment yield ion antagonism

Received: 15 February 2021 Published: 25 December 2021

CLC:

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Corresponding Authors: Yuanjun NI,Ying FENG E-mail: 17863807350@163.com;391733495@qq.com;yfeng@zju.edu.cn

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Cite this article:

Qiyao ZHOU,Yuanjun NI,Shun’an XU,Qiong WANG,Lichuan ZHAN,Ying FENG. Effects of foliar conditioners on safety production of main rice varieties in cadmium-contaminated farmland in eastern Zhejiang Province. Journal of Zhejiang University (Agriculture and Life Sciences), 2021, 47(6): 768-776.

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http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2021.02.151 OR http://www.zjujournals.com/agr/Y2021/V47/I6/768

叶面调理剂对浙江东部镉污染农田水稻主栽品种安全生产的影响

为降低作物可食部的重金属含量，实现中轻度污染农田安全利用，通过连续2年的田间试验，比较了不同离子拮抗型叶面调理剂的作用效应及优选的调理剂对水稻安全生产的影响。田间小区试验结果表明，供试的5种叶面调理剂在2个试验点均有明显的降镉（Cd）增产作用，其中以喷施多元复合叶面调理剂降低稻米Cd含量的效果最佳，2个试验点糙米Cd含量分别降低13.0%和14.5%。进一步通过田间大区试验比较叶面喷施该多元复合调理剂对浙江东部7个主栽水稻品种产量和稻米Cd含量的影响发现，喷施该叶面调理剂可增产8.2%～10.8%，糙米Cd含量下降15.7%～20.3%，其中以YY17配施叶面调理剂处理的糙米Cd含量最低。这些结果说明，低积累品种配施多元复合调理剂可以有效降低糙米Cd含量，在实现Cd轻度污染农田安全利用的同时促进水稻生产的增产增效。

关键词： 重金属, 叶面肥, 田间试验, 产量, 离子拮抗

Table 1 Basic physicochemical properties and heavy metal contents of cultivated soil samples in experimental sites

Table 2 Rice varieties

Table 3 Preparation and treatment of tested foliar conditioners

Table 4 Yield characters of rice treated with different foliar conditioners

Table 5 Cd contents of different parts of rice treated with different foliar conditioners

Fig. 1 Effects of the foliar conditioners on biomass per plant (A) and yield (B) of different rice varietiesDifferent lowercase letters above the bars indicate significant differences between different treatments at the 0.05 probability level.

Fig. 2 Effects of the foliar conditioners on Cd contents in brown rice (A), rice husk (B), rachis (C), straw (D) of different rice varietiesDifferent lowercase letters above the bars indicate significant differences between different treatments at the 0.05 probability level.


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