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| Effects of pig farm wastes on growth and Cd concentrations of lettuce grown in a cadmium polluted soil |
| Received:September 22, 2015 |
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| KeyWord:soil;Cd;lettuce;pig manure;biogas residue;biogas slurry |
| Author Name | Affiliation | E-mail | | TANG Ming-deng | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China | | | LI Meng-jun | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China | | | WANG Yan-hong | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China | | | AI Shao-ying | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China | shaoyingai@21cn.com | | YU Dan-ni | Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation
Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China | |
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| Abstract: |
| A pot experiment with two successive cropping was conducted to investigate the effects of 3 wastes(pig manure, biogas slurry, and biogas residue) from a large-scale pig farm in Boluo county, Guangdong Province, South China, on the growth and cadmium(Cd) concentrations of Lactuca sativa grown in a Cd polluted soil. Based on total nitrogen rates of 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6 g·kg-1 soil, 5, 10, 15, 20, 25, and 30 g of air-dried pig manure, 3, 6, 9, 12, 15, and 18 g of air-dried biogas residue, or 185, 370, 555, 740, 925, and 1110 mL of biogas slurry were respectively applied to 1 kg soil in a plastic pot. All pig manure and air dried biogas residue and 40% of the biogas slurry were used as basal fertilizers, and the rest 60% of the biogas slurry were applied as top dress. Results showed that both type and rate of wastes significantly affected shoot biomass of lettuce, with the rate having greater influence on the biomass than type. The lettuce biomass for the 1st cropping decreased with increasing waste amount. For the 2nd cropping, the shoot biomass showed a "Λ" relationship with the rates of biogas slurry or biogas residue, but a dose-effect relationship with pig manure. Likewise, both type and rate of wastes significantly affected shoot Cd concentrations. However, waste types had greater effects on shoot Cd concentrations than waste rates. Compared with the control, both pig manure and biogas residue significantly decreased plant shoot Cd concentrations in a dose-effect manner, but biogas slurry applications significantly increased shoot Cd concentrations. The changes of shoot Cd concentrations were mainly attributed to the biomass dilution effect. Lettuce grew normally at no more than 370 mL of biogas slurry, 10 g pig manure, or 15 g biogas residue per 1 kg of the tested soil. |
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