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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
25/08/1995 |
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Data da última atualização: |
06/04/2017 |
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Autoria: |
ANTUNES, V.; CARDOSO, E. J. B. N. |
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Título: |
Growth and nutrient status of citrus plants as influenced by mycorrhiza and phosphorus application. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Plant and Soil, v.131, n.1, p.11-19, 1991. |
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Idioma: |
Inglês |
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Conteúdo: |
To test the hypothesis that high levels of soluble phosphate applied in combination with VAM fungi, to citrus plant, can cause growth depression even in the absence of other limiting factors and also to test if rock phosphate, under these conditions, may be a satisfactory P source, a greenhouse experiment was conducted using sterilized soil with four levels of phosphate (0, 50, 100 and 200 ppm) P) supplied either as soluble P or as rock phosphate. Citrus seedlings were either inoculated with the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus etunicatum or left uninoculated. Six months after the start of the experiment, the plants were harvested and shoot dry weight, P and K uptake, root colonization and the number of spores in 50 cm3 of soil were determined. Significant increases were found in dry matter yields and in P and K contents, due to VAM fungus inoculation, at the zero and 50 ppm soluble P levels and at all rock phosphate levels. At 100 ppm soluble P, the development of VAM plants was equivalent to than of non-VAM plants and at 200 ppm was significantly less than that of non-VAM plants. Root colonization and sporulation were reduced at higher P levels. The absolute growth depression of VAM plants at the higher P level was likely due to P toxicity. In addition, high leaf P and K concentrations may have interfered with carbohydrate distribution and utilization in these symbioses. Rock phosphate may be used with VAM citrus to substitute for medium amounts of soluble phosphate. MenosTo test the hypothesis that high levels of soluble phosphate applied in combination with VAM fungi, to citrus plant, can cause growth depression even in the absence of other limiting factors and also to test if rock phosphate, under these conditions, may be a satisfactory P source, a greenhouse experiment was conducted using sterilized soil with four levels of phosphate (0, 50, 100 and 200 ppm) P) supplied either as soluble P or as rock phosphate. Citrus seedlings were either inoculated with the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus etunicatum or left uninoculated. Six months after the start of the experiment, the plants were harvested and shoot dry weight, P and K uptake, root colonization and the number of spores in 50 cm3 of soil were determined. Significant increases were found in dry matter yields and in P and K contents, due to VAM fungus inoculation, at the zero and 50 ppm soluble P levels and at all rock phosphate levels. At 100 ppm soluble P, the development of VAM plants was equivalent to than of non-VAM plants and at 200 ppm was significantly less than that of non-VAM plants. Root colonization and sporulation were reduced at higher P levels. The absolute growth depression of VAM plants at the higher P level was likely due to P toxicity. In addition, high leaf P and K concentrations may have interfered with carbohydrate distribution and utilization in these symbioses. Rock phosphate may be used with VAM citrus to substitute for medium amounts of solu... Mostrar Tudo |
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Palavras-Chave: |
Aplicacao; Application; Efeito; Effect; Mycorrhiza. |
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Thesagro: |
Fósforo; Glomus Etunicatum. |
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Thesaurus Nal: |
phosphorus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02126naa a2200229 a 4500
001 1785830
005 2017-04-06
008 1991 bl --- 0-- u #d
100 1 $aANTUNES, V.
245 $aGrowth and nutrient status of citrus plants as influenced by mycorrhiza and phosphorus application.
260 $c1991
520 $aTo test the hypothesis that high levels of soluble phosphate applied in combination with VAM fungi, to citrus plant, can cause growth depression even in the absence of other limiting factors and also to test if rock phosphate, under these conditions, may be a satisfactory P source, a greenhouse experiment was conducted using sterilized soil with four levels of phosphate (0, 50, 100 and 200 ppm) P) supplied either as soluble P or as rock phosphate. Citrus seedlings were either inoculated with the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus etunicatum or left uninoculated. Six months after the start of the experiment, the plants were harvested and shoot dry weight, P and K uptake, root colonization and the number of spores in 50 cm3 of soil were determined. Significant increases were found in dry matter yields and in P and K contents, due to VAM fungus inoculation, at the zero and 50 ppm soluble P levels and at all rock phosphate levels. At 100 ppm soluble P, the development of VAM plants was equivalent to than of non-VAM plants and at 200 ppm was significantly less than that of non-VAM plants. Root colonization and sporulation were reduced at higher P levels. The absolute growth depression of VAM plants at the higher P level was likely due to P toxicity. In addition, high leaf P and K concentrations may have interfered with carbohydrate distribution and utilization in these symbioses. Rock phosphate may be used with VAM citrus to substitute for medium amounts of soluble phosphate.
650 $aphosphorus
650 $aFósforo
650 $aGlomus Etunicatum
653 $aAplicacao
653 $aApplication
653 $aEfeito
653 $aEffect
653 $aMycorrhiza
700 1 $aCARDOSO, E. J. B. N.
773 $tPlant and Soil$gv.131, n.1, p.11-19, 1991.
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Embrapa Pantanal (CPAP) |
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