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Itens para a visualização no momento 61-70 of 315
Emissões de amônia e óxido nitroso após aplicação de dejetos de bovinos na semeadura e ureia em cobertura na sucessão trigo/milho em plantio direto
(Universidade Federal de Santa Maria, 2016-11-25)
The application of dairy slurry (DS) to the soil surface in no-till can result in the ammonia (NH3) and nitrous oxide (N2O) emission to atmosphere, with negative repercussions both agronomical and environmentally. The ...
Modelagem de processos erosivos em uma bacia agrícola: limitações e possibilidades
(Universidade Federal de Santa Maria, 2017-03-01)
The growing demand for modeling tools able represent erosive processes in catchments, and their connections, requires that mathematical modelling be associated with monitoring. This doctoral thesis sought to contribute to ...
Nitrogênio de resíduos de culturas de verão em frações físicas da matéria orgânica de dois solos de terras baixas
(Universidade Federal de Santa Maria, 2018-11-06)
Rio Grande do Sul has about 20% of its total area of soils with hydromorphic characteristics, denominated lowlands suitable for rice cultivation (Oryza sativa) irrigated by flooding. In order to mitigate damage caused by ...
Nitrogênio na solução do solo e aspectos nutricionais e fisiológicos do milho cultivado após 12 anos sob fontes orgânicas e mineral
(Universidade Federal de Santa Maria, 2018-07-19)
Animal manures are frequently utilized in agriculture as a source of nutrients, especially nitrogen (N). The
objective of this work was to evaluate how the application of manure from different animal breeding systems
during ...
Capacidade de preparos de solo reduzirem limitações físicas naturais de áreas de várzea para o cultivo de soja
(Universidade Federal de Santa Maria, 2015-08-14)
The soybean crop development in lowland soils in recent years has increased. The aim of this study was to investigate the capacity of the soil management to modify the physical environment of the soil, and analyze the role ...
Redistribuição de sedimentos em encostas por meio do C total e do isótopo 13C
(Universidade Federal de Santa Maria, 2017-07-17)
High intensity of rains, associated with inadequate management in agricultural areas, have been caused loss of large volumes of soil by erosion, leading the sediments and nutrients to the hydric sources. The loss of sediments ...
Carbono-¹³C de raízes e parte aérea de culturas de verão em frações físicas da matéria orgânica de dois solos de várzea
(Universidade Federal de Santa Maria, 2017-07-31)
Crop diversification in lowland areas in Rio Grande do Sul is incorporating sorghum (Sorghum bicolor) and soybean (Glycine max) into rotation system with irrigated rice (Oryza sativa). Little is known about the impact of ...
Preparos do solo para eucalipto em segunda rotação: propriedades físicas e químicas e crescimento inicial
(Universidade Federal de Santa Maria, 2017-02-24)
Reforestation areas of forest plantation, which are cultivated in a second rotation, may have the soil structure altered by compaction from the surface to the deeper layers, because of the traffic of machines during ...
Adaptações na teoria de Green-Ampt para modelar a infiltração de água no solo
(Universidade Federal de Santa Maria, 2017-02-22)
The mathematical modeling of water infiltration into soil on a profile scale with the Green-Ampt (GA) model corresponds to the theme of this dissertation. The GA model, in this dissertation, was considered a physical-empirical ...
Modelagem do excedente de infiltração para avaliar a funcionalidade hidrológica do solo
(Universidade Federal de Santa Maria, 2017-07-28)
The soil ability to compartmentalize water in the hydrological cycle can be studied in terms of the soil physical quality and might be indicated by soil’s properties, attributes or process. Of these, the processes are more ...