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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal; Embrapa Solos. |
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Data corrente: |
20/03/2002 |
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Data da última atualização: |
22/11/2002 |
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Autoria: |
FERRAZ, L. |
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Título: |
A study of factors affecting the availability of potassium in red bay fine sandy loam, a humic paleudult. |
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Ano de publicação: |
1968 |
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Fonte/Imprenta: |
s.l.: University of Florida, 1968. |
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Páginas: |
79p. |
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Idioma: |
Inglês |
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Notas: |
M.Sc. Thesis. |
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Conteúdo: |
Crops were grown in the greenhouse on samples of Red Bay fine sandy loam which had received various levels of potassium and a uniform lime rate followed by cropping and leaching for several years. Exchangeable potassium was related to the residual treatments but differences were samll and even the highest level was lower than recommended for maximum plant growth. Most of the residual potassium was expected to be in the difficultly or moderately fixed forms. There was also a treatment with high residual potassium levels, although potassium contents and uptake increased significantly with rates of residual potassium. Lime increased yields of cats, cabbage, and tomatoes. The yield increases were related to calcium, magnesium, iron, aluminum, and molybdenum contents of the plants and inversely related to the levels of zinc, copper, and manganese. Molydbenum and calcium were extremely low in the unlimed cabbage and tomatoes. Cabbage had a cupped leaf appearance. Two other virgin sources of Red Bay fine sandy loam having NH4 OAc-extractable potassium adequate for most crops were planted to cherokee wax beans at different potassium levels. These two sources did not respond to potassium. The source with pH 4.3 and 220 ppm NH4 OAc-extractable calcium gave a yield response to lime but not the source with pH 5.3 and 260 ppm calcium. These experiments showed that exchangeable potassium in itself may not be a measure of the potassium supplying power of a particular soil. Source A, a cultivated soil, deficient................... MenosCrops were grown in the greenhouse on samples of Red Bay fine sandy loam which had received various levels of potassium and a uniform lime rate followed by cropping and leaching for several years. Exchangeable potassium was related to the residual treatments but differences were samll and even the highest level was lower than recommended for maximum plant growth. Most of the residual potassium was expected to be in the difficultly or moderately fixed forms. There was also a treatment with high residual potassium levels, although potassium contents and uptake increased significantly with rates of residual potassium. Lime increased yields of cats, cabbage, and tomatoes. The yield increases were related to calcium, magnesium, iron, aluminum, and molybdenum contents of the plants and inversely related to the levels of zinc, copper, and manganese. Molydbenum and calcium were extremely low in the unlimed cabbage and tomatoes. Cabbage had a cupped leaf appearance. Two other virgin sources of Red Bay fine sandy loam having NH4 OAc-extractable potassium adequate for most crops were planted to cherokee wax beans at different potassium levels. These two sources did not respond to potassium. The source with pH 4.3 and 220 ppm NH4 OAc-extractable calcium gave a yield response to lime but not the source with pH 5.3 and 260 ppm calcium. These experiments showed that exchangeable potassium in itself may not be a measure of the potassium supplying power of a particular soil. Source A, a cult... Mostrar Tudo |
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Palavras-Chave: |
Potassium fixation. |
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Thesagro: |
Adubação; Potássio; Solo. |
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Thesaurus Nal: |
nutrition; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02085nam a2200205 a 4500
001 1331578
005 2002-11-22
008 1968 bl uuuu m 00u1 u #d
100 1 $aFERRAZ, L.
245 $aA study of factors affecting the availability of potassium in red bay fine sandy loam, a humic paleudult.
260 $as.l.: University of Florida$c1968
300 $a79p.
500 $aM.Sc. Thesis.
520 $aCrops were grown in the greenhouse on samples of Red Bay fine sandy loam which had received various levels of potassium and a uniform lime rate followed by cropping and leaching for several years. Exchangeable potassium was related to the residual treatments but differences were samll and even the highest level was lower than recommended for maximum plant growth. Most of the residual potassium was expected to be in the difficultly or moderately fixed forms. There was also a treatment with high residual potassium levels, although potassium contents and uptake increased significantly with rates of residual potassium. Lime increased yields of cats, cabbage, and tomatoes. The yield increases were related to calcium, magnesium, iron, aluminum, and molybdenum contents of the plants and inversely related to the levels of zinc, copper, and manganese. Molydbenum and calcium were extremely low in the unlimed cabbage and tomatoes. Cabbage had a cupped leaf appearance. Two other virgin sources of Red Bay fine sandy loam having NH4 OAc-extractable potassium adequate for most crops were planted to cherokee wax beans at different potassium levels. These two sources did not respond to potassium. The source with pH 4.3 and 220 ppm NH4 OAc-extractable calcium gave a yield response to lime but not the source with pH 5.3 and 260 ppm calcium. These experiments showed that exchangeable potassium in itself may not be a measure of the potassium supplying power of a particular soil. Source A, a cultivated soil, deficient...................
650 $anutrition
650 $asoil
650 $aAdubação
650 $aPotássio
650 $aSolo
653 $aPotassium fixation
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Registro original: |
Embrapa Solos (CNPS) |
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