variação da agregação induzida por plantas de cobertura de solo no inverno e plantio direto de milho em um solo podzólico variation in aggregation indüced by winter cover crops and corn no-tillage in a hapludalf
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ID: 196861
1998
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Abstract
Com objetivo de avaliar o efeito da cobertura do solo no inverno por diferentes plantas sobre a estabilidade de agregados estáveis em água, desenvolveu-se um experimento de maio/93 a maio/95, em solo Podzóiico vermelho-amarelo (PV) da área experimental do Departamento de Solos da Universidade Federal de Santa Maria. Os tratamentos constaram das seguintes plantas de cobertura de solo no inverno: ervilha forrageira (Pisum arvensis), ervilhaca (Vicia saliva L.), chícharo (Lathyrus sativus L.), azevém (Lolium multiflorum Lam), tremoço azul (Lupinus angustifolius Lam.), aveia preta (Avena strigosa Shieb) e pousio invernal. As coletas de amostras do solo para as análises da estabilidade de agregados foram feitas a 5cm de profundidade e em quatro épocas: florescimento das plantas de cobertura de solo, logo após a semeadura do milho, florescimento e colheita do milho. No primeiro ano de avaliação (93/94), quarto ano de execução do experimento, verificou-se uma superioridade da aveia preta em relação ao tremoço, ervilhaca, chícharo e ervilha forrageira, durante o ciclo vegetativo das plantas de cobertura de inverno, já no ano agrícola 94/95 não houve grandes diferenças na estabilidade estrutural entre os tratamentos.
A field study was carried out from May of 1993 to May of 1995 at Federal University of Santa Maria campus at the Soil Science Department experimental área, using an experiment installed on a typic Hapludalf (yellow-red podzolic) since 1989. The objectives were to evaluate the impact of some winter cover crops on water aggregate stability afterfour andfive year ofno- tiliage system. The cover crops used were: forage pea (Pisum arvensis), common vetch (Vicia saliva), wild winter pea (Lathyrus sativus), ryegrass (Lolium multiflorum Iam), blue lupine (Lupinus angustifolius) and black oat (Avena strigosa). The fallow was used as a control treatment. Soil samples to measure aggregate stability were extracted from 0 to 5cm depth atfour dates ofeach year: (l st) - cover crops atflowering; (2nd) - after com emergency; (3rd) - com tasseling and; (4th) - com harversting. In 1993/94) growing season the treatment with black oat cover crop induced higher water aggregate stability than other cover crops. However, for the following year ali cover crops inproved the aggregate stabilty to a levei wich was not observed significant dijference among then.
A field study was carried out from May of 1993 to May of 1995 at Federal University of Santa Maria campus at the Soil Science Department experimental área, using an experiment installed on a typic Hapludalf (yellow-red podzolic) since 1989. The objectives were to evaluate the impact of some winter cover crops on water aggregate stability afterfour andfive year ofno- tiliage system. The cover crops used were: forage pea (Pisum arvensis), common vetch (Vicia saliva), wild winter pea (Lathyrus sativus), ryegrass (Lolium multiflorum Iam), blue lupine (Lupinus angustifolius) and black oat (Avena strigosa). The fallow was used as a control treatment. Soil samples to measure aggregate stability were extracted from 0 to 5cm depth atfour dates ofeach year: (l st) - cover crops atflowering; (2nd) - after com emergency; (3rd) - com tasseling and; (4th) - com harversting. In 1993/94) growing season the treatment with black oat cover crop induced higher water aggregate stability than other cover crops. However, for the following year ali cover crops inproved the aggregate stabilty to a levei wich was not observed significant dijference among then.
| Reference Key |
basso1998cinciavariao
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|---|---|
| Authors | ;Claudir José Basso;Dalvan José Reinert |
| Journal | Trials |
| Year | 1998 |
| DOI |
10.1590/S0103-84781998000400006
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