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Registro Completo |
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
14/11/2018 |
Data da última atualização: |
14/11/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
PEREIRA, W. D.; MARTINS NETO, F. L.; SANTOS, R. H. S.; OLIVEIRA, T. S. de; URQUIAGA, S. |
Afiliação: |
UFV; UFV; UFV; UFV; SEGUNDO SACRAMENTO U CABALLERO, CNPAB. |
Título: |
Changes in the stocks of C and N in organic matter fractions in soil cropped with coffee and fertilized with sunn hemp and ammonium sulfate |
Título original: |
Alterações dos estoques de C e N nas frações da matéria orgânica de solo cultivado com cafeeiro e adubado com crotalária e sulfato de amônio. |
Ano de publicação: |
2018 |
Fonte/Imprenta: |
Semina: Ciências Agrárias, Londrina, v. 39, n. 3, p. 999-1014, maio/jun. 2018. |
DOI: |
10.5433/1679-0359.2018v39n3p999 |
Idioma: |
Inglês |
Conteúdo: |
Despite the potential to provide N to crops, the rapid incorporation of green manure nutrients into stable fractions of organic matter in the soil (SOM) may reduce the efficiency of green manuring. Thus, the objective of this work was to characterize the changes of C and N stocks in fractions of SOM cultivated with coffee (Coffea arabica L.) and fertilized with sunn hemp (Crotalaria juncea) and ammonium sulfate. To study the changes in organic C (OC) and total N (TN) in soil and fractions of SOM over time, soil samples were collected in the 0?5 and 5?10 cm layers, with the initial sampling done prior to the application of sunn hemp residues and ammonium sulfate. Five samples were collected every 2 months after the application of the legume and ammonium sulfate. The soil samples were submitted to densimetric and granulometric fractionation, obtaining the free light organic matter (F-LOM), particulate organic matter (POM), and organic matter associated with minerals (MAM). OC and TN stocks were then determined in soil and the SOM fractions. The changes in the stocks of OC (ΔStcC) in the soil in relation to time zero were positive in the evaluations carried out in the two layers. The fractions of SOM showed positive ΔStcC at almost all of the evaluated times. The N supplied to the soil in the form of mineral and organic fertilizer promoted an increase of 0.24 Mg ha-1 of N in the 0?5 cm layer until after 60 days. Of this total, 0.03 Mg ha-1 was associated with F-LOM, 0.07 Mg ha-1 with M, and the remainder was associated with MAM. Nearly 60% of the N that was supplied to the soil was drawn to the stable fractions of the SOM, indicating a rapid stabilization of this nutrient in the most recalcitrant organic compartments. Despite that, the variations in N stocks of MAM became smaller over time, and eventually became negative, in relation to time zero. This indicates the mineralization of N of this compartment. In the 5?10 cm layer, no effect of time was observed in the soil TN, N-POM, or N-MAM stocks. Additionally, under the conditions of this experiment, the majority of the N supplied to the soil was rapidly incorporated into the most stable fraction of SOM, and this might can reduced the efficiency of the green manuring. MenosDespite the potential to provide N to crops, the rapid incorporation of green manure nutrients into stable fractions of organic matter in the soil (SOM) may reduce the efficiency of green manuring. Thus, the objective of this work was to characterize the changes of C and N stocks in fractions of SOM cultivated with coffee (Coffea arabica L.) and fertilized with sunn hemp (Crotalaria juncea) and ammonium sulfate. To study the changes in organic C (OC) and total N (TN) in soil and fractions of SOM over time, soil samples were collected in the 0?5 and 5?10 cm layers, with the initial sampling done prior to the application of sunn hemp residues and ammonium sulfate. Five samples were collected every 2 months after the application of the legume and ammonium sulfate. The soil samples were submitted to densimetric and granulometric fractionation, obtaining the free light organic matter (F-LOM), particulate organic matter (POM), and organic matter associated with minerals (MAM). OC and TN stocks were then determined in soil and the SOM fractions. The changes in the stocks of OC (ΔStcC) in the soil in relation to time zero were positive in the evaluations carried out in the two layers. The fractions of SOM showed positive ΔStcC at almost all of the evaluated times. The N supplied to the soil in the form of mineral and organic fertilizer promoted an increase of 0.24 Mg ha-1 of N in the 0?5 cm layer until after 60 days. Of this total, 0.03 Mg ha-1 was associated with F-LOM, 0... Mostrar Tudo |
Palavras-Chave: |
Densimetric fractionation; Granulometric fractionation; Organic compartments. |
Thesagro: |
Crotalária Juncea. |
Thesaurus Nal: |
Green manures. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 03272naa a2200253 a 4500 001 2099372 005 2018-11-14 008 2018 bl uuuu u00u1 u #d 024 7 $a10.5433/1679-0359.2018v39n3p999$2DOI 100 1 $aPEREIRA, W. D. 240 $aAlterações dos estoques de C e N nas frações da matéria orgânica de solo cultivado com cafeeiro e adubado com crotalária e sulfato de amônio. 245 $aChanges in the stocks of C and N in organic matter fractions in soil cropped with coffee and fertilized with sunn hemp and ammonium sulfate$h[electronic resource] 260 $c2018 520 $aDespite the potential to provide N to crops, the rapid incorporation of green manure nutrients into stable fractions of organic matter in the soil (SOM) may reduce the efficiency of green manuring. Thus, the objective of this work was to characterize the changes of C and N stocks in fractions of SOM cultivated with coffee (Coffea arabica L.) and fertilized with sunn hemp (Crotalaria juncea) and ammonium sulfate. To study the changes in organic C (OC) and total N (TN) in soil and fractions of SOM over time, soil samples were collected in the 0?5 and 5?10 cm layers, with the initial sampling done prior to the application of sunn hemp residues and ammonium sulfate. Five samples were collected every 2 months after the application of the legume and ammonium sulfate. The soil samples were submitted to densimetric and granulometric fractionation, obtaining the free light organic matter (F-LOM), particulate organic matter (POM), and organic matter associated with minerals (MAM). OC and TN stocks were then determined in soil and the SOM fractions. The changes in the stocks of OC (ΔStcC) in the soil in relation to time zero were positive in the evaluations carried out in the two layers. The fractions of SOM showed positive ΔStcC at almost all of the evaluated times. The N supplied to the soil in the form of mineral and organic fertilizer promoted an increase of 0.24 Mg ha-1 of N in the 0?5 cm layer until after 60 days. Of this total, 0.03 Mg ha-1 was associated with F-LOM, 0.07 Mg ha-1 with M, and the remainder was associated with MAM. Nearly 60% of the N that was supplied to the soil was drawn to the stable fractions of the SOM, indicating a rapid stabilization of this nutrient in the most recalcitrant organic compartments. Despite that, the variations in N stocks of MAM became smaller over time, and eventually became negative, in relation to time zero. This indicates the mineralization of N of this compartment. In the 5?10 cm layer, no effect of time was observed in the soil TN, N-POM, or N-MAM stocks. Additionally, under the conditions of this experiment, the majority of the N supplied to the soil was rapidly incorporated into the most stable fraction of SOM, and this might can reduced the efficiency of the green manuring. 650 $aGreen manures 650 $aCrotalária Juncea 653 $aDensimetric fractionation 653 $aGranulometric fractionation 653 $aOrganic compartments 700 1 $aMARTINS NETO, F. L. 700 1 $aSANTOS, R. H. S. 700 1 $aOLIVEIRA, T. S. de 700 1 $aURQUIAGA, S. 773 $tSemina: Ciências Agrárias, Londrina$gv. 39, n. 3, p. 999-1014, maio/jun. 2018.
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Embrapa Agrobiologia (CNPAB) |
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Registro Completo
Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
Data corrente: |
16/02/2005 |
Data da última atualização: |
04/04/2005 |
Autoria: |
PEREIRA, D. C.; DODE, M. A. N.; RUMPF, R. |
Título: |
Evaluation of different culture systems on the in vitro production of bovine embryos. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
Theriogenology, New York, v. 63, n. 4, p. 1131-1141, 2005. |
Idioma: |
Inglês |
Conteúdo: |
The objective of this study was to determine the development potential and quality of in vitro produced bovine embryos cultured individually or in groups. After IVM and IVF, presumptive zygotes were cultured in groups or individually, either in drops or in the modified well of the well (mWOW) system. In Experiment 1, four culture systems were utilized: T1: drop in group (control); T2: mWOW in groups; T3: mWOW individually; and T4: drop individually. Cleavage and blastocyst rates at Days 6, 7 and 8 and total cell number of Day 6 blastocysts were similar (P > 0.05) for all treatments. However, in Day 7 blastocysts, total cell number was lower (P < 0.05) in embryos cultured individually in a small drop than those cultured in the mWOW. In Experiment 2, blastocysts of T1, T2 and T3 were allocated into two groups, control and vitrified. After warming, the vitrified embryos were cultured for 72 h. At 48 h, the development of the Days 6 and 7 embryos was similar (P > 0.05) for all treatments in the control group. For the vitrified embryos, lower hatching rates (P < 0.05) were observed in the T3 group. In conclusion, embryos cultured in groups in the mWOW system had the same blastocyst rates but better quality (measured by their survival after vitrification) than those cultured individually in the mWOW system.
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Thesagro: |
Bovino; Embrião. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01803naa a2200169 a 4500 001 1185514 005 2005-04-04 008 2005 bl --- 0-- u #d 100 1 $aPEREIRA, D. C. 245 $aEvaluation of different culture systems on the in vitro production of bovine embryos. 260 $c2005 520 $aThe objective of this study was to determine the development potential and quality of in vitro produced bovine embryos cultured individually or in groups. After IVM and IVF, presumptive zygotes were cultured in groups or individually, either in drops or in the modified well of the well (mWOW) system. In Experiment 1, four culture systems were utilized: T1: drop in group (control); T2: mWOW in groups; T3: mWOW individually; and T4: drop individually. Cleavage and blastocyst rates at Days 6, 7 and 8 and total cell number of Day 6 blastocysts were similar (P > 0.05) for all treatments. However, in Day 7 blastocysts, total cell number was lower (P < 0.05) in embryos cultured individually in a small drop than those cultured in the mWOW. In Experiment 2, blastocysts of T1, T2 and T3 were allocated into two groups, control and vitrified. After warming, the vitrified embryos were cultured for 72 h. At 48 h, the development of the Days 6 and 7 embryos was similar (P > 0.05) for all treatments in the control group. For the vitrified embryos, lower hatching rates (P < 0.05) were observed in the T3 group. In conclusion, embryos cultured in groups in the mWOW system had the same blastocyst rates but better quality (measured by their survival after vitrification) than those cultured individually in the mWOW system. 650 $aBovino 650 $aEmbrião 700 1 $aDODE, M. A. N. 700 1 $aRUMPF, R. 773 $tTheriogenology, New York$gv. 63, n. 4, p. 1131-1141, 2005.
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