Zinc levels in rice and in soil according to the soil types of Japan, Indonesia, and China.
The means of zinc levels in rice of Japan, Indonesia and China were practically identical, 23.38, 23.51, and 21.47 micrograms/g for Japan, Indonesia and China respectively. Regarding soil, Japan seemed to have an higher concentration of zinc. When samples were divided by soil type, Histosols (all samples from Indonesia) appeared to contain the highest (27.37 micrograms/g) and Acrisols the lowest (21.04 micrograms/g) zinc level among all the soil types. Mixed soils, 10 out of 18 samples from China, had the highest concentration of zinc both using hydrochloric extracting method and the nitric acid ashing method. The relationship of zinc in rice to the types of soils was insignificant. It appears that zinc contents in rice and soil are not influenced by soil type. Total dietary intakes of zinc of the people from Japan, Indonesia and China were 24.3, 21.9 and 22.7 mg/person, respectively, which was higher than the recommended dietary allowance of daily zinc intake from foods by the American standard diet (15 mg/person).
Herawati
N
N
Department of Public Health, Gunma University, School of Medicine, Maebashi, Japan.
Rivai
I F
IF
Koyama
H
H
Suzuki
S
S
D002681:China; D007214:Indonesia; D007564:Japan; D012275:Oryza / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D015032:Zinc / Q000032:analysis*
D012987:Soil; D015032:Zinc