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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
03/05/2001 |
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Data da última atualização: |
03/05/2001 |
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Autoria: |
NEUFELDT, H.; SILVA, J. E. da; AYARZA, M. A.; ZECH, W. |
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Título: |
Land-use effects on phosphorus fractions in Cerrado oxisols. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Biology and Fertility of Soils, Heidelberger, v.31, p.30-37, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Differently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only incresead levels of inorganic P (Pi) forms, the increase being mot acentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particlesize fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69-87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also na effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction. |
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Thesagro: |
Cerrado; Fósforo; Fracionamento; Oxisol; Uso da Terra. |
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Thesaurus Nal: |
Ferralsols; fractionation; land use; phosphorus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02166naa a2200265 a 4500
001 1546797
005 2001-05-03
008 2000 bl --- 0-- u #d
100 1 $aNEUFELDT, H.
245 $aLand-use effects on phosphorus fractions in Cerrado oxisols.
260 $c2000
520 $aDifferently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only incresead levels of inorganic P (Pi) forms, the increase being mot acentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particlesize fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69-87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also na effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction.
650 $aFerralsols
650 $afractionation
650 $aland use
650 $aphosphorus
650 $aCerrado
650 $aFósforo
650 $aFracionamento
650 $aOxisol
650 $aUso da Terra
700 1 $aSILVA, J. E. da
700 1 $aAYARZA, M. A.
700 1 $aZECH, W.
773 $tBiology and Fertility of Soils, Heidelberger$gv.31, p.30-37, 2000.
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
23/01/2006 |
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Data da última atualização: |
18/09/2017 |
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Autoria: |
SCAPIM, C. A.; PACHECO, C. A. P.; TONET, A.; BRACCINI, A. de L. E.; PINTO, R. J. B. |
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Afiliação: |
CLESO ANTONIO PATTO PACHECO, CNPMS. |
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Título: |
Analise dialética e heterose de populações de milho-pipoca. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Bragantia, Campinas, v. 61, n. 3 p. 219-230, 2002. |
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Idioma: |
Português |
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Conteúdo: |
A diallel set of crosses among nine popcorn (Zea mays) cultivars, UNB-2, RS-20, UEM-J1, UEM-M2, CMS 42, CMS 43, Vicosa, Beija-flor and advanced generation of hybrid three-way Zelia, and their hybrid combinations was carried out to obtain heritability and heterosis estimates. The cultivars and F1s were evaluated in two crop years (1998/99 and 1999/2000) with three replications each year in Iguatemi, State of Parana, Brazil. The results allowed the synthesis of composts based on cultivars of high combining ability for yield such as UNB-2 and CMS-42 and the cultivars Zelia, RS-20 and UEM-M2 to popping expansion. The cultivars Beija-flor and RS-20 were recommend to be used in a reciprocal recurrent selection programme. For popping expansion there are positive and negative heterosis, indicating non-unidirectional dominance.. DESCRIPTORS: combining-ability; crop-yield; cultivars-; diallel-analysis; heritability-; heterosis-; maize-; popcorn-; popping-quality |
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Palavras-Chave: |
combining-ability; crop-yield; cultivars-; diallel-analysis; heritability-; heterosis-; maize-; popcorn-; popping-quality. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/31360/1/Analise-dialetica.pdf
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Marc: |
LEADER 01713naa a2200277 a 4500
001 1489130
005 2017-09-18
008 2002 bl uuuu u00u1 u #d
100 1 $aSCAPIM, C. A.
245 $aAnalise dialética e heterose de populações de milho-pipoca.$h[electronic resource]
260 $c2002
520 $aA diallel set of crosses among nine popcorn (Zea mays) cultivars, UNB-2, RS-20, UEM-J1, UEM-M2, CMS 42, CMS 43, Vicosa, Beija-flor and advanced generation of hybrid three-way Zelia, and their hybrid combinations was carried out to obtain heritability and heterosis estimates. The cultivars and F1s were evaluated in two crop years (1998/99 and 1999/2000) with three replications each year in Iguatemi, State of Parana, Brazil. The results allowed the synthesis of composts based on cultivars of high combining ability for yield such as UNB-2 and CMS-42 and the cultivars Zelia, RS-20 and UEM-M2 to popping expansion. The cultivars Beija-flor and RS-20 were recommend to be used in a reciprocal recurrent selection programme. For popping expansion there are positive and negative heterosis, indicating non-unidirectional dominance.. DESCRIPTORS: combining-ability; crop-yield; cultivars-; diallel-analysis; heritability-; heterosis-; maize-; popcorn-; popping-quality
653 $acombining-ability
653 $acrop-yield
653 $acultivars-
653 $adiallel-analysis
653 $aheritability-
653 $aheterosis-
653 $amaize-
653 $apopcorn-
653 $apopping-quality
700 1 $aPACHECO, C. A. P.
700 1 $aTONET, A.
700 1 $aBRACCINI, A. de L. E.
700 1 $aPINTO, R. J. B.
773 $tBragantia, Campinas$gv. 61, n. 3 p. 219-230, 2002.
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Embrapa Milho e Sorgo (CNPMS) |
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