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Luiz Roberto Martins Pinto
Universidade Estadual de Santa Cruz, Campus Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Salobrinho, CEP: 45662-900 Ilhéus, Bahia, Brazil

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Journal article
Published: 05 January 2017 in Hydrology
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Surface crusts, formed by raindrop impact, degrade the soil surface structure causing changes in porosity. An experiment was conducted with the objective of evaluating the influence of the formation of a crusting layer on the porosity (percentage of area, shape and size) of a Haplic Acrisol under three tillage systems, and simulated rainfall. The tillage systems were: conventional tillage (CT), reduced tillage (RT) and no-tillage (NT). Each tillage system was submitted to different levels of simulated rainfall (0, 27, 54 and 80 mm) at an intensity of 80 mm·h−1. Undisturbed soil samples were collected and resin impregnated for image analysis in two layers: layer 1 (0–1 cm) and layer 2 (1–2 cm). Image analysis was used to obtain the pore area percentage, pore shape and size. The degradation of the soil surface and change in porosity, caused by rainfall, occurred differently in the tillage systems. In the CT and RT systems, the most pronounced pore changes caused by rainfall occurred in layer 1, but in the NT system, this change occurred in layer 2. The rainfall caused change of pore area percentage in the CT and RT systems, with reduction of complex and an increase of rounded pores. The NT system showed greater occurrence of the rounded pores (vesicles), originated by processes of wetting below the residue cover, and by alternating periods of wetting and drying. In this study, the changes in porosity were attributed to two main factors: (1) to the effect of the raindrop directly on the soil surface (for CT and RT tillage systems) and (2) water transfer processes in the soil surface (for NT systems).

ACS Style

Jaqueline Dalla Rosa; Miguel Cooper; Frédéric Darboux; João Carlos Medeiros; Carla Campanaro; Luiz Roberto Martins Pinto. Influence of Crust Formation on Soil Porosity under Tillage Systems and Simulated Rainfall. Hydrology 2017, 4, 3 .

AMA Style

Jaqueline Dalla Rosa, Miguel Cooper, Frédéric Darboux, João Carlos Medeiros, Carla Campanaro, Luiz Roberto Martins Pinto. Influence of Crust Formation on Soil Porosity under Tillage Systems and Simulated Rainfall. Hydrology. 2017; 4 (1):3.

Chicago/Turabian Style

Jaqueline Dalla Rosa; Miguel Cooper; Frédéric Darboux; João Carlos Medeiros; Carla Campanaro; Luiz Roberto Martins Pinto. 2017. "Influence of Crust Formation on Soil Porosity under Tillage Systems and Simulated Rainfall." Hydrology 4, no. 1: 3.

Journal article
Published: 01 June 2012 in Tropical Plant Pathology
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Resistance of progenies of cacao to Ceratocystis wilt Seedlings from open-pollinated progenies of 20 clones of cocoa (Theobroma cacao) were inoculated with the fungus Ceratocystis cacaofunesta, the causal agent of Ceratocystis wilt, and their response was assessed based on the percentage of dead plants. Open pollinated progeny of clones TSH1188 and VB1151 were used as standards for resistance, while CCN51 and SJ02 for susceptibility. Contrasts between these benchmarks and the progenies studied were estimated and evaluated by Dunnett's t test (alpha = 0.05). The progenies showed different responses to C. cacaofunesta, and it was possible to classify them into three groups: resistant (FCB01, CSG70, BOBA01, VB902, TSH1188, VB1151, PS1319 and MAC01), moderately susceptible (HW25, PM02, FA13, PH15, M05 and BJ11) and susceptible (CCN51, FB206, PH16, SJ02, CCN10 and FSU77)

ACS Style

Stela Dalva Vieira Midlej Silva; Luiz Roberto Martins Pinto; Bruno Ferreira De Oliveira; Virginia Oliveira Damaceno; José Luis Pires; Carlos Tadeu Dos Santos Dias. Resistência de progênies de cacaueiro à murcha-de-Ceratocystis. Tropical Plant Pathology 2012, 37, 191 -195.

AMA Style

Stela Dalva Vieira Midlej Silva, Luiz Roberto Martins Pinto, Bruno Ferreira De Oliveira, Virginia Oliveira Damaceno, José Luis Pires, Carlos Tadeu Dos Santos Dias. Resistência de progênies de cacaueiro à murcha-de-Ceratocystis. Tropical Plant Pathology. 2012; 37 (3):191-195.

Chicago/Turabian Style

Stela Dalva Vieira Midlej Silva; Luiz Roberto Martins Pinto; Bruno Ferreira De Oliveira; Virginia Oliveira Damaceno; José Luis Pires; Carlos Tadeu Dos Santos Dias. 2012. "Resistência de progênies de cacaueiro à murcha-de-Ceratocystis." Tropical Plant Pathology 37, no. 3: 191-195.

Journal article
Published: 01 December 2007 in Fitopatologia Brasileira
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Resistance of fourteen Theobroma cacao clones to Phytophthora spp. was evaluated using stem inoculations on grafted seedlings. Concepts of phenotypic stability were used to interpret the results and to express horizontality of the resistance. The linear regression coefficient 'b', the determination coefficient (R²) and average lesion size were used to determine the level of horizontal resistance, the phenotypic stability and the predictability of all clones. The results indicated that clones P 7 and MA 15 present highest levels of horizontal resistance and stability, but with moderate predictability. Clones CAS 1 and CEPEC 13 were classified as those with high horizontal resistance, stability and predictability, while clones PA 30, UF 650 and SIAL 88 and EET 59 showed intermediate resistance and stability and high predictability. Clones SPA 17, OC 61, PA 150, SIAL 505, ICS 1 and R 41 presented high susceptibility and intermediate or low stability and moderate or high predictability.

ACS Style

Luiz Roberto M. Pinto; Stela Dalva V.M. Silva; Milton M. Yamada. Evaluation of phenotypic stability of resistance to Phytophthora spp. in cacao clones. Fitopatologia Brasileira 2007, 32, 453 -457.

AMA Style

Luiz Roberto M. Pinto, Stela Dalva V.M. Silva, Milton M. Yamada. Evaluation of phenotypic stability of resistance to Phytophthora spp. in cacao clones. Fitopatologia Brasileira. 2007; 32 (6):453-457.

Chicago/Turabian Style

Luiz Roberto M. Pinto; Stela Dalva V.M. Silva; Milton M. Yamada. 2007. "Evaluation of phenotypic stability of resistance to Phytophthora spp. in cacao clones." Fitopatologia Brasileira 32, no. 6: 453-457.