Coffee Science
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3355
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Resultados da Pesquisa
Item Seasonal change of soil precompression stress in coffee plantation under sub-humid tropical condition(Editora UFLA, 2014-04) Iori, Piero; Dias Junior, Moacir de Souza; Ajayi, Ayodele Ebenezer; Guimarães, Paulo Tácito Gontijo; Souza, Zélio Resende de; Figueiredo, Vanessa CastroThe objective of this study was to describe the seasonal change of precompression stress behavior in coffee plantations in the sub-humid tropic zone of Brazil as affected by agriculture traffic associated with the time since the establishment the coffee plantation, field slope, sampling position in and sampling depths. The coffee plantations on a uniform soil type; Red-Yellow Latosol were aged 2, 7, 18 and 33 years. Areas with side slope of 3, 9 and 15% were selected in these coffee plantations for this study. The soil was sampled at three positions on the coffee plantation row (bottom of traffic line, inter-row and top of traffic line) and at two depths (topsoil and sub-surface). Samples were collected over a one year period for each month of year. The study showed that the time since the establishment of a coffee farm and the slope steepness had significant effect on soil disturbance in mechanized operation. The coffee plantation with longer establishment time and on steeper terrain had higher precompression stress. The top traffic line presented higher load-bearing capacity than inter-row and bottom traffic line. The sites were more susceptible to compaction in the period from November to January of the year , because the Red-Yellow Latosol presented lower load-bearing capacity than the stress applied by tractor used in coffee management practices.Item Weed management and its influence on the load bearing capacity of red-yellow latosol under the crown projection in coffee culture(Editora UFLA, 2009-07) Santos, Gislene Aparecida dos; Dias Junior, Moacir de Souza; Guimarães, Paulo Tácito Gontijo; Araújo Junior, Francisco; Pais, Paula Sant Anna MoreiraWeed management is identified as a major cause of soil compaction in coffee plantations, because of its necessary frequent undertaking. The objectives of this study were: a) to develop bearing capacity models, for a Red-Yellow Latosol cultivated with coffee (Coffea arabica, L.), as a function of the associated weed management methods, preconsolidation pressure and moisture; b) to identify, through the use of these models, the weed management more resistant and more susceptible to soil compaction, under the coffee crown projection. This study was carried out in an experiment installed in the Experimental Farm of EPAMIG in Patrocínio MG, using the Rubi cultivar 1192. The weed control methods were: Hand hoe, Post-emergence herbicide, Pre-emergence herbicide and Brush Trimmer (Roçacarpa commercial name), associated with the rotary tiller, disk harrow, were mower and no weed control between plant rows. For each weed management, 15 samples were collected at depths of 0-3, 10-13 and 25-28 cm, to generate the capacity bearing model, totaling 720 undisturbed soil samples. To obtain the capacity bearing models, the undisturbed soil samples with different moisture content were submitted to the uniaxial compression tests according to Bowles (1986) modified by Dias Junior (1994). The pre-emergence herbicide associated to no weed control condition and were mower and the hand hoe associated to no weed control presented higher resistance to soil compaction. The Brush Trimmer (Roçacarpa) methods, associated to were mower; the Pre-emergence herbicide, associated to rotary tillers; and Pre-emergence herbicide and Brush Trimmer, associated to disk harrow between rows, presented higher susceptibility to soil compaction.Item Suscetibilidade à compactação de um latossolo vemermelho-amarelo submetido a diferentes métodos de controle de plantas invasoras, na cultura cafeeira(Editora UFLA, 2010-05) Santos, Gislene Aparecida dos; Dias Junior, Moacir de Souza; Guimarães, Paulo Tácito Gontijo; Pais, Paula Sant’Anna MoreiraObjetivou-se, neste estudo: a) desenvolver modelos de capacidade de suporte de carga (CSC), para um LVA cultivado com cafeeiro, em função dos métodos associados de controle de plantas invasoras, pressão de preconsolidação e umidade b) identificar, através do uso desses modelos, o método de controle mais resistente e mais suscetível à compactação, nas entrelinhas (EL) e linhas de tráfego (LT). O estudo foi conduzido na Fazenda Experimental da EPAMIG de Patrocínio MG, em uma lavoura cafeeira (Coffea arabica L.). Os métodos de controle utilizados foram: nas entrelinhas - enxada rotativa, grade de disco, roçadora e sem capina (testemunha). Para cada condição de manejo, coletou-se nas profundidades 0-3, 10-13 e 25-28 cm, 15 amostras para gerar o modelo de CSC, tanto nas EL como nas LT, totalizando 315 amostras, com exceção do método sem capina, em que foi realizado apenas nas entrelinhas. Para a obtenção dos modelos, as amostras com diferentes umidades foram submetidas ao ensaio de compressão. Nas EL, a enxada rotativa, roçadora e grade de discos nas profundidades 0-3, 10-13 e 25-28 cm promoveram compactação do solo, enquanto que a grade de discos, nas mesmas profundidades, proporcionou um alívio da resistência mecânica do solo. Na LT, como método de controle a enxada rotativa, na profundidade de 0-3 cm foi o método de controle mais susceptível à compactação do solo; na profundidade 10-13 cm, quando foi utilizada a enxada rotativa, a grade de discos e a roçadora promoveram compactação do solo; na profundidade 25-28 cm, uma maior suscetibilidade à compactação foi promovida quando utilizou-se a roçadora.