Phosphorus availability to rice from phosphate rock and Sesbania rostrata and Vicia faba green manure /
A greenhouse study was conducted to determine Sesbania
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739891071&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | A greenhouse study was conducted to determine Sesbania rostrata and Vicia faba green manure production and phosphorus (P) uptake from a reactive North Carolina phosphate rock (NC PR) and a low reactivity Tahoua phosphate rock (TA PR), applied in 1.250 kg pots at 0, 500, and 1000 mg P kg-1 in Crowley silt loam and Labelle silty clay loam. Green manure and phosphate rock effects on soil pH, exchangeable acidity, Al3+, H+ , rice dry matter production, and P uptakes were evaluated. Dry matter production increased 2 fold for V faba and 1.6 fold for S. rostrata while P uptake increased 3 fold for V faba and 3.3, fold for S. rostrata in Crowley soil treated with I 000 mg P kg-1 as NC PR. Vicia faba green manure applied at 10.6 g pot-1 to Crowley soil with NC PR at 1000 mg P kg-1 increased soil pH from 4.4 to 6.0. When similar treatments were applied to Labelle, soil pH increased from 5.3 to 6.0. Bray P1 increased 25.4 fold and 22.5 fold and exchangeable Al 3+ decreased 3.3 fold and 2.8 fold in Crowley and Labelle soils, respectively. Vicia faba green manure applied at 10.6 g pot-1 with NC PR at 1000 mg P kg-1 increased rice dry matter production 8 fold and 4 fold while P uptake was increased 22 fold and 13 fold in Crowley and Labelle soils, respectively. Rice dry matter production increased (as much as 55 % in Labelle soil) and P uptake (as much as 91 % in Crowley soil), when these treatments were applied, compared to NC PR alone. Sesbania rostrata green manure at 8.5 g pot-1 in Crowley soil had greater desorbed P (27.5 mg kg-1) and higher equilibrium solution P (2.6 mg L-1 ) than in Labelle soil when NC PR was added. Results from this greenhouse and laboratory research suggest that the use of PR in combination with S. rostrata or V. faba green manure can be utilized on low P, acid soils to supply adequate P and create sustainable rice production systems provided the difficulties inherent to PR and green manure use in ricelands are resolved. |
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| Item Description: | Vita. "Major Subject: Soil Science". |
| Physical Description: | xvii, 159 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 128-143. |