In:
Soil Science Society of America Journal, Wiley, Vol. 74, No. 5 ( 2010-09), p. 1589-1596
Abstract:
The potential availability ( E ) and partitioning ( K d ) of Se added to three soils as elemental Se (Se 0 ), sodium selenite (SeO 3 2− ), and sodium selenate (SeO 4 2− ) were measured by isotopic dilution using either 75 SeO 3 2− or 75 SeO 4 2− The soils were kept either submerged or at 80% water‐holding capacity for either 15 or 60 d. Both K d and E values were controlled by the type of Se, soil moisture content, and time after application. The K d values for SeO 3 2− were largely controlled by soil type, with the soil having the lowest pH and highest concentrations of oxalate‐extractable Al and Fe having the highest K d values. The K d values for SeO 4 2− , on the other hand, were largely influenced by the incubation period, and to a lesser extent soil type and moisture conditions. Selenate K d values decreased with incubation and were higher under submerged conditions. The availability of Se 0 as measured by concentrations of labile Se species was low due to limited oxidation to SeO 3 2− or SeO 4 2− Elemental Se is therefore not suitable for preplant Se fertilization of lowland rice ( Oryza sativa L.) because it is not readily oxidized. In the submerged soils, concentrations of labile SeO 3 2− and SeO 4 2− were also low, with 〉 80% of the Se added as either SeO 3 2− or SeO 4 2− being fixed into nonlabile pools, probably through reduction to Se 0 Rates of oxidation of Se 0 will play a critical role in determining whether reduced Se 0 formed in submerged soils after fertilization will contribute to plant Se uptake through oxidation either during field drainage before harvest or in the rice rhizosphere.
Type of Medium:
Online Resource
ISSN:
0361-5995
,
1435-0661
DOI:
10.2136/sssaj2009.0416
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
241415-6
detail.hit.zdb_id:
2239747-4
detail.hit.zdb_id:
196788-5
detail.hit.zdb_id:
1481691-X
SSG:
13
SSG:
21
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