Effects of Nano Selenium and Chitosan Compounds on Lettuce Planted in Cadmium-contaminated Soils

doi:10.11924/j.issn.1000-6850.casb2020-0830

Abstract

Abstract:

To obtain the safe production conditions of lettuce, the effects of nano selenium, chitosan and their combined fertilization on the yield, quality and cadmium content of lettuce planted in heavy metal contaminated soil were investigated. The results showed that compared with the control group, the application of nano selenium, chitosan and their combination could significantly improve the quality of lettuce, in which the fresh weight increased by 14.08%-53.73%, chlorophyll increased by 2.36%-22.38%, soluble reducing sugar content increased by 21.95%-407.66%, soluble protein content increased by 41.47%-112.73%, and Cd content decreased by 9.59%-19.49%. The combination of nano selenium and chitosan had obvious synergistic effect. When nano selenium was 30 mg/L and chitosan was 100 mg/L, the cadmium content in lettuce was the lowest, and the yield and quality were the best. The optimal ratio of nano selenium and chitosan is found in this study and the compatibility could be used for safe production of crops in soils with excessive heavy metals.

Key words: nano-selenium, chitosan, soils with excessive heavy metals, cadmium-contaminated soils, lettuce, quality, synergistic effect

CLC Number:

S314

Li Jianzhao, Gao Wanchao, Li Xian, Liu Pei, Jiang Bin, Tong Chunyi. Effects of Nano Selenium and Chitosan Compounds on Lettuce Planted in Cadmium-contaminated Soils[J]. Chinese Agricultural Science Bulletin, 2021, 37(23): 113-117.

Figures/Tables 7

References 16

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因素/试验号	壳聚糖/(mg/L)	纳米硒/(mg/L)	鲜重/g	增加比例/%
CK	0	0	38.720±2.900	—
A	0	30	55.188±2.510	42.53
B	0	90	44.170±2.005	14.08
C	50	0	50.840±3.565	31.30
D	50	30	55.767±5.480	44.03
E	50	90	59.525±3.814	53.73
F	100	0	57.160±4.816	47.62
G	100	30	58.237±4.265	50.41
H	100	90	50.200±2.689	29.65
K_i₁	138.078	146.720
K_i₂	166.132	169.192
K_i₃	165.597	153.895
K_j₁	46.026	48.906
K_j₂	55.377	56.397
K_j₃	55.199	51.298
R_i	9.351	7.491

因素/试验号	壳聚糖/(mg/L)	纳米硒/(mg/L)	鲜重/g	增加比例/%
CK	0	0	38.720±2.900	—
A	0	30	55.188±2.510	42.53
B	0	90	44.170±2.005	14.08
C	50	0	50.840±3.565	31.30
D	50	30	55.767±5.480	44.03
E	50	90	59.525±3.814	53.73
F	100	0	57.160±4.816	47.62
G	100	30	58.237±4.265	50.41
H	100	90	50.200±2.689	29.65
K_i₁	138.078	146.720
K_i₂	166.132	169.192
K_i₃	165.597	153.895
K_j₁	46.026	48.906
K_j₂	55.377	56.397
K_j₃	55.199	51.298
R_i	9.351	7.491

因素/试验号	壳聚糖/(mg/L)	纳米硒/(mg/L)	叶绿素含量/(mg/g)
CK	0	0	1.1686±0.0865
A	0	30	1.2427±0.0744
B	0	90	1.2387±0.0421
C	50	0	1.2742±0.0753
D	50	30	1.4078±0.1059
E	50	90	1.1962±0.0700
F	100	0	1.1656±0.0985
G	100	30	1.4300±0.0879
H	100	90	1.3654±0.0910
K_i₁	3.6500	3.6084
K_i₂	3.8782	4.0805
K_i₃	3.9610	3.8000
K_j₁	1.2166	1.2028
K_j₂	1.2927	1.3602
K_j₃	1.3203	1.2667
R_i	0.1037	0.1574

因素/试验号	壳聚糖/(mg/L)	纳米硒/(mg/L)	叶绿素含量/(mg/g)
CK	0	0	1.1686±0.0865
A	0	30	1.2427±0.0744
B	0	90	1.2387±0.0421
C	50	0	1.2742±0.0753
D	50	30	1.4078±0.1059
E	50	90	1.1962±0.0700
F	100	0	1.1656±0.0985
G	100	30	1.4300±0.0879
H	100	90	1.3654±0.0910
K_i₁	3.6500	3.6084
K_i₂	3.8782	4.0805
K_i₃	3.9610	3.8000
K_j₁	1.2166	1.2028
K_j₂	1.2927	1.3602
K_j₃	1.3203	1.2667
R_i	0.1037	0.1574

因素/试验号	壳聚糖/ (mg/L)	纳米硒/ (mg/L)	还原糖含量/ (g/100 g鲜重)
CK	0	0	0.1412±0.021
A	0	30	0.1818±0.013
B	0	90	0.2533±0.014
C	50	0	0.3372±0.020
D	50	30	0.3417±0.016
E	50	90	0.2037±0.025
F	100	0	0.1722±0.030
G	100	30	0.7168±0.033
H	100	90	0.4318±0.024
K_i₁	0.5763	0.6506
K_i₂	0.8826	1.2403
K_i₃	1.3208	0.8888
K_j₁	0.1921	0.2169
K_j₂	0.2942	0.4134
K_j₃	0.4403	0.2963
R_i	0.2482	0.1965