Load support capacity of a latosol cultivated with coffee plantation under associated methods of weed control / Capacidade suporte de carga de um latossolo submetido a mÃtodos associados de controle de plantas daninhas em cafeeiros.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The control of weeds plants in the coffee plantation can be made through chemical and mechanical methods, which could promote alterations in the soil structure. The objectives of this study were: a) to develop bearing capacity models, for a Yellow Red Latosol cultivated with coffee, as a function of the associated methods of weed control, preconsolidation pressure and moisture; b) to identify, through the use of these models, the method of weed control more resistant and more susceptible to soil compaction. This study was carried out in an experiment installed in the Experimental Farm of EPAMIG in PatrocÃnio MG State using the Rubi cultivate 1192. The control methods of weeds plants were: between plant row: rotary tiller, disk harrow, were mower and no weed control and in the cup projection: were mower (RoÃacarpa), herbicide of pre-emergency, herbicide of after-emergency and hand hoe. The samplings were made in the traffic line, between the traffic line and in the cup projection of the coffee trees [15 samples x 3 depths x 3 blocks x 20 (4 plots + 16 subplots) weeds management], totaling 1.035 samples. To obtaining the bearing capacity models, the undisturbed soil samples with different moisture content were submitted to the uniaxial compression text according to Bowles (1986) modified by Dias Junior (1994). In the traffic line the rotary tiller, in the depth of 0-3 cm was the weed of control method more susceptible to compaction; while the rotary tiller and the disk harrow were the methods that promoted larger soil compaction in depth. In the between traffic line position, the disk harrow, in the 0-3 cm depth was the weed control method more susceptible to compaction; and the rotary tiller and were mower were the methods that promoted larger soil compaction in depth. In the cup projection, in the 0-3 cm depth, for moisture content smaller than 0.15 kg kg-1, the methods hand hoe and herbicide of pre-emergency in the cup projection associated to the disk harrow presented larger resistance to compaction. For moisture content higher than 0.15 kg kg-1 the method herbicide of pre-emergency in the cup projection associated with were mower presented larger resistance to compaction; while the largest susceptibility to soil compaction happened in the method herbicide of after-emergency in the cup projection associated to the method no weed control and in the methods hand hoe and herbicide of pre-emergency associated to the disk harrow. In the depth of 10-13 cm, for moisture content smaller than 0.30 kg kg-1 the method herbicide of pre-emergency and hand hoe in the cup projection associated with the condition no weed control presented larger resistance to the compaction. For moisture content greater than 0.30 kg kg-1 the method were mower (RoÃacarpa) in cup projection associated with were mower presented larger susceptibility to compaction. In the 25-28 cm depth, the method herbicide of pre-emergency in the cup projection associated with were mower presented larger resistance to compaction. For moisture content smaller than 0.22 kg kg-1 the method herbicide of pre-emergency in the cup projection associated with rotary tiller presented larger susceptibility to compaction. For moisture content greater than 0.22 kg kg-1, the methods herbicide of pre-emergency and were mower (RoÃacarpa) in the cup projection associated with disk harrow presented larger susceptibility to compaction.

ASSUNTO(S)

weed plant capacidade de suporte de carga load support capacity cafà latosol ciencia do solo latossolos planta daninha coffee

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