title: Cadmium distribution in rice plants grown in three different soils after application of pig manure with added cadmium.
abstract: A glasshouse pot experiment was conducted to investigate Cd concentrations in the aboveground parts of two consecutive crops of rice and Cd availability in three different soils (loam, silt loam, and sandy loam) after application of pig manure with added Cd. Soil pH tended to increase with increasing application rate of pig manure from 1 to 3% (w/w, oven dry basis). Soil diethylene triamine pentaacetic acid (DTPA) extractable Cd showed a clear positive correlation with soil total Cd content and increased with increasing Cd amendment of the manure but showed no difference between the two manure application rates. Cd concentrations in the grain, husk, and straw were significantly and positively correlated with soil DTPA-extractable Cd (p < 0.001). Within each level of manure Cd, the higher rate (3%) of manure produced lower Cd concentrations in the grain, husk, and straw on all three soils than did the lower rate (1%) after the first crop, but this no longer occurred after the growth of the second crop. Grain Cd concentrations exceeded the Chinese National Food Quality Standard (0.2 mg kg(-1)) most often on the loam, with intermediate frequency on the silt loam, and least often on the sandy loam, the soil with the highest pH and lowest organic carbon content and cation exchange capacity.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Cunliang
authors.initials: C
authors.lastname: Han
authors.forename: Longhua
authors.initials: L
authors.lastname: Wu
authors.forename: Weina
authors.initials: W
authors.lastname: Tan
authors.forename: Daoxu
authors.initials: D
authors.lastname: Zhong
authors.forename: Yujuan
authors.initials: Y
authors.lastname: Huang
authors.forename: Yongming
authors.initials: Y
authors.lastname: Luo
authors.forename: Peter
authors.initials: P
authors.lastname: Christie
mesh_terms: D000818:Animals; D002104:Cadmium / Q000032:analysis / Q000378:metabolism*; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000032:analysis*; D012275:Oryza / Q000378:metabolism*; D012639:Seeds / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D013054:Spectrophotometry, Atomic; D013552:Swine
chemical_list: D008372:Manure; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium