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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Yield and Phosphorus Transformations in a Rice-Wheat System with Crop Residue and Phosphorus Management  [2007]

Gupta, R.K.; Yadvinder-Singh; Ladha, J.K.; Bijay-Singh; et al.

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Phosphorous deficiency limits productivity of rice (Oryza sativa L.)-wheat (Triticum aestivum L.) systems in the Indo-Gangetic Plains. Deterioration of soil and air quality due to straw burning is also a concern. Field experiments were conducted to determine the effects of straw and P management strategies on yield, P balance, and P transformations in soil in a rice-wheat system. Four treatments composed of different combinations of rice and wheat straw removal, burning, and incorporation were the main plots. Subplot treatments were P fertilization to wheat or to both rice and wheat and a no-P control. Wheat yield was similar where straw was burned in situ or removed. Incorporation of straw increased the wheat yield in Year 4. Significant straw x P management interactions, observed after 4 yr, suggested that residues can enhance yield under limited P supply situations. Application of 26 kg P ha-1 to wheat increased grain yield by 6 to 15% compared with no P. Rice yield did not respond to incorporation of residues or P fertilization. The P balance was negative with removal or burning of rice straw, but when both wheat and rice straw were incorporated, the balance was positive at the recommended P level (26 kg P ha-1 to wheat only). Changes in total soil P suggested that the two crops remove significant P from below 15 cm. Incorporation of residues increased soil Olsen, inorganic, and organic P; reduced P sorption; and increased P release. Data show that con
tinuous incorporation of residues substituted for 13 kg inorganic P ha-1 yr-1 and improved system yield.
From the journal
Soil Science Society of America journal
ISSN : 0361-5995

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
71
Issue:
5
Start Page:
1500
End Page:
1507
All titles:
"Yield and Phosphorus Transformations in a Rice-Wheat System with Crop Residue and Phosphorus Management"@eng
Other:
"Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
71
Issue:
5
Start Page:
1500
End Page:
1507
All titles:
"Yield and Phosphorus Transformations in a Rice-Wheat System with Crop Residue and Phosphorus Management"@eng
Other:
"Includes references"