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Transformation of fertilizer P in a Vertisol amended with farmyard manure

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Title Transformation of fertilizer P in a Vertisol amended with farmyard manure
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Creator Sammi Reddy K., Subba Rao, A. and Takkar, P.N.
 
Subject Farmyard manure, Vertisol, P availability, P fixation, Organic and inorganic P fractions, P mobilization, Low-input agriculture
 
Description Not Available
Availability, fixation, and transformation of added P were studied in a 16-week incubation experiment
with a Vertisol amended with farmyard manure in pots with 500 g soil each. P availability, as measured by Olsen
P, decreased for up to 8 weeks with various rates of added P, when no manure was applied. In the presence of farmyard manure, P availability decreased during the first 6 weeks and then showed a considerable increase from the 8th week onwards. P fixation increased for up to 8 weeks with the rates of P in the absence of manure. With manure application, P fixation increased only during the first 6 weeks and thereafter decreased continuously. Thus the presence of farmyard manure shortened the period of P fixation and promoted its availability. After 16 weeks of
incubation, when manure and fertilizer P were applied together, P was transformed into labile organic (NaHCO3-P),
moderately labile organic P (NaOH-P), and calcium-bound inorganic P (HC1-P). When manure was not applied. P accumulated predominantly as labile inorganic (NaHCO3-P), moderately labile inorganic (NaOH-P), and inorganic HC1-R The application of farmyard manure enriched long-term P fertility through NaHCO3-P and NaOH-P and a shortterm P supply as HCI-R All fractions except inorganic NaOH-P showed good relationships with Olsen P low P concentration of this manure, farmers are not encouraged to use it as a sole fertilizer in intensive crop production.
The manure has a high value, however, when applied in large quantities and for a considerably long time
(Maurya and Ghosh 1972; Goss and Stewart 1979). Studies have shown that the P in farmyard manure is more
readily available and persists over time (Abbot and Tuckar 1973). Farmyard manure retains or immobilizes added R
subsequently mineralizes it (Ghosal 1975), and makes it available to plants for an extended period of time. In a
study on two paddy soils amended with organic manure, Zhang et al. (1994) reported that labile and moderately labile organic P fractions increased in the Ultisol and decreased in the Entisol, This finding was attributed to differences in the organic matter content of the two soils. In the present study, the behaviour of P as influenced by different rates of added R alone or in the presence of farmyard manure, was investigated in a Vertisol.
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Date 2021-08-25T04:30:53Z
2021-08-25T04:30:53Z
1996-01-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/60390
 
Language English
 
Relation Not Available;
 
Publisher Not Available