ISSN:
1573-5036
Keywords:
DTPA
;
EDTA
;
Fe, oxalate
;
P
;
rice soils
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Poorly crystalline Fe in soil has been shown to affect Fe and P availability. Oxalate extractable Fe, a measure of poorly crystalline Fe oxides, has not been compared to soil test methods for Fe and P in rice soils. Twenty eight soils used for rice production were incubated under aerobic and anaerobic soil conditions and extracted for Fe and P with ammonium oxalate, ammonium acetate-EDTA (AA-EDTA), ammonium bicarbonate-DTPA (AB-DTPA) and DTPA. Citrate-dithionite extractable Fe and Fe content of rice plants in a greenhouse experiment were also determined. Soils used in this experiment had a large amount of poorly-crystalline Fe oxide. In some soils, poorly-crystalline Fe constituted 60% of the citrate-dithionite extractable Fe. The amount of extractable Fe and P increased significantly under anaerobic conditions. The relationships between extractants showed that DTPA Fe was highly correlated to AB-DTPA Fe and oxalate Fe was highly correlated to AA-EDTA Fe. There was no relationship between Fe and P extracted by AB-DTPA, while there was a better relationship with ammonium oxalate and AA-EDTA extractants. Poorly-crystalline Fe and P extracted by ammonium oxalate were correlated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00008065
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