Soil phosphorus status and fertilizer use in select agricutural soils in Nicaragua /
A survey of small, medium and large Nicaraguan producers indicated a heavy reliance on imported complete fertilizer. Analysis of soils sampled from the large-scale commercial producers found low P retention in the lowland heavy clay soils. These soils contained high amounts of plant available P as...
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2001.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | A survey of small, medium and large Nicaraguan producers indicated a heavy reliance on imported complete fertilizer. Analysis of soils sampled from the large-scale commercial producers found low P retention in the lowland heavy clay soils. These soils contained high amounts of plant available P as indicated by four soil P testing methods, Texas A&M, Bray I, Mehlich III and Olsen. These same methods extracted less P from soils from Pacific coast volcanic lowlands and central highland uplands, indicating significant P retention in soils of these two regions. These findings are supported by a greenhouse study in which an indicator crop grown in the lowland clay soils demonstrated no response to added P. A high response in the indicator crop was observed in the volcanic lowland and central highland soils. Correlation between the four P extraction methods and plant response in the volcanic lowland and central highland soils was high, indicating all methods were adequate for these soils. A statistical correlation of the P quantities extracted by the four methods from all soils in the study found that all methods correlated well, indicating that all methods are adequate for the soils in the study. A phosphorus fractionation method found lowland-clay soils were dominated by the Ca-P fraction. The predominant fractions in volcanic lowland and central highland soils were Fe-P and Al-P. |
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| Item Description: | "Major subject: Soil Science". Vita. |
| Physical Description: | viii, 123 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references (leaves 89-95). |