Trabalho Apresentado em Evento

Phosphorus management for perennial crops in central Amazonian upland soils

The present contribution discusses the soil P status of central Amazonian upland soils, the effects of tree crops on soil P availability and the factors controlling soil P cycling in land use systems with tree crops. Soil fertility management has to target the prevalent P deficiency by adequate P fe...

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Autor principal: Lehmann, Johannes
Outros Autores: Silva Cravo, Manoel da, Vasconselos de Macêdo, Jeferson Luiz, Moreira, Ado?nis Baldaia, Schroth, G?otz
Grau: Trabalho Apresentado em Evento
Idioma: English
Publicado em: Plant and Soil 2020
Assuntos:
Agricultural Management
Nutrient Availability
Phosphorus
Soil Fertility
Brasil
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/19977
id oai:repositorio:1-19977
recordtype dspace
spelling oai:repositorio:1-19977 Phosphorus management for perennial crops in central Amazonian upland soils Lehmann, Johannes Silva Cravo, Manoel da Vasconselos de Macêdo, Jeferson Luiz Moreira, Ado?nis Baldaia Schroth, G?otz Agricultural Management Nutrient Availability Phosphorus Soil Fertility Brasil The present contribution discusses the soil P status of central Amazonian upland soils, the effects of tree crops on soil P availability and the factors controlling soil P cycling in land use systems with tree crops. Soil fertility management has to target the prevalent P deficiency by adequate P fertilization, especially in southern and northern municipalities of central Amazônia where the largest areas with severe P deficiency are found. P fixation to clay minerals is not a major obstacle for P management in the highly weathered upland soils of the central Amazon due to their low A1- and Fe-oxide contents. Low total soil P amounts are mainly responsible for low P availability. Tree crops are found to be especially suitable for land use under low-P-input conditions. Their large P return to soil by litterfall and pruning improves soil P availability. Additionally, litter quality affects P release and soil P availability. Both aspects, quantity and quality effects, are strongly dependent on tree species. Phosphorus sorption does not seem to be reduced by different litter types confirming earlier results that P fixation is not a major problem in central Amazonian upland soils. In conclusion, biological approaches are more important than physical approaches to improve soil P availability in central Amazonian Oxisols. With large P cycling through soil microbial biomass and between plant and soil, a higher availability of added P can be maintained and P applications only need to replenish P exports by harvest. Low P additions will improve productivity also for long-term uptake by trees. This is of high importance in regions with poor infrastructure and the lack of financial resources. 2020-06-16T17:29:09Z 2020-06-16T17:29:09Z 2001 Trabalho Apresentado em Evento https://repositorio.inpa.gov.br/handle/1/19977 10.1023/A:1013320721048 en Volume 237, Número 2, Pags. 309-319 Restrito Plant and Soil
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Agricultural Management
Nutrient Availability
Phosphorus
Soil Fertility
Brasil
spellingShingle Agricultural Management
Nutrient Availability
Phosphorus
Soil Fertility
Brasil
Lehmann, Johannes
Phosphorus management for perennial crops in central Amazonian upland soils
topic_facet Agricultural Management
Nutrient Availability
Phosphorus
Soil Fertility
Brasil
description The present contribution discusses the soil P status of central Amazonian upland soils, the effects of tree crops on soil P availability and the factors controlling soil P cycling in land use systems with tree crops. Soil fertility management has to target the prevalent P deficiency by adequate P fertilization, especially in southern and northern municipalities of central Amazônia where the largest areas with severe P deficiency are found. P fixation to clay minerals is not a major obstacle for P management in the highly weathered upland soils of the central Amazon due to their low A1- and Fe-oxide contents. Low total soil P amounts are mainly responsible for low P availability. Tree crops are found to be especially suitable for land use under low-P-input conditions. Their large P return to soil by litterfall and pruning improves soil P availability. Additionally, litter quality affects P release and soil P availability. Both aspects, quantity and quality effects, are strongly dependent on tree species. Phosphorus sorption does not seem to be reduced by different litter types confirming earlier results that P fixation is not a major problem in central Amazonian upland soils. In conclusion, biological approaches are more important than physical approaches to improve soil P availability in central Amazonian Oxisols. With large P cycling through soil microbial biomass and between plant and soil, a higher availability of added P can be maintained and P applications only need to replenish P exports by harvest. Low P additions will improve productivity also for long-term uptake by trees. This is of high importance in regions with poor infrastructure and the lack of financial resources.
format Trabalho Apresentado em Evento
author Lehmann, Johannes
author2 Silva Cravo, Manoel da
Vasconselos de Macêdo, Jeferson Luiz
Moreira, Ado?nis Baldaia
Schroth, G?otz
author2Str Silva Cravo, Manoel da
Vasconselos de Macêdo, Jeferson Luiz
Moreira, Ado?nis Baldaia
Schroth, G?otz
title Phosphorus management for perennial crops in central Amazonian upland soils
title_short Phosphorus management for perennial crops in central Amazonian upland soils
title_full Phosphorus management for perennial crops in central Amazonian upland soils
title_fullStr Phosphorus management for perennial crops in central Amazonian upland soils
title_full_unstemmed Phosphorus management for perennial crops in central Amazonian upland soils
title_sort phosphorus management for perennial crops in central amazonian upland soils
publisher Plant and Soil
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/19977
_version_ 1787145291612291072
score 11.653393

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