Eduardo Jorge Maklouf Carvalho

Comportamento físico-hídrico de um podzólico vermelho-amarelo câmbico fase terraço sob diferentes sistemas de manejo

The study was carried out in the county of Vicosa, MG, Brazil, in the campus of Universidade Federal de Vicosa (UFV). The objective was to study the physico-hydric behavior of a Red Yellow Cambic Podzolic soil terrace phase under different management systems. The experimental design was a completely randomized block design, with five treatments and four replications. Treatments were: 1- moldboard plow; 2- disk plow; 3- heavy disk harrow; 4- no tillage; 5- control (fallow). Organic matter, texture, bulk density, particle density, total porosity, macro-porosity and micro-porosity, agregates and soil moisture tension curves were measured. Results indicate that: soil organic matter is slightly greater in no-tillage and control plots, and reduces in heavy disk plots in the surface 15 cm of the profile; cultivation with heavy machinery increases soil bulk density only slightly in the surface 15 cm of the soil profile; soil tillage increases macroporosity; no-till and control plots show greater aggregate stability; no-tillage plots have greater water holding capacity.

Resposta de cultivares de pimenta-do-reino aos nutrientes NPK em um Latossolo Amarelo da Amazônia Oriental

The present work was developed with the objective of establishing response curves of black pepper to nitrogen, phosphorus and potassium in an Oxisol (Yellow Latosol, dystrophic) in Senador Jose Porfirio County, km 35 of the Transamazonian road, in Brazil. The levels of nitrogen, applied manually every year were (0; 40; 80; 120 and 160 kg ha-1 N) in the urea form, five phosphorus levels (0; 30; 60; 90 and 120 kg ha-1 P2O5) in the form of triple superphosphate and five potassium levels (0; 30; 60; 90 and 120 kg ha-1 K2O) in the form of potassium chloride. The experimental design consisted of blocks with three replicates, being the treatments disposed as an incomplete factorial. The spacing was of 3.0 m between lines and 2.5 m between plants with six useful plants per plot. The results evidenced positive response of nitrogen in relation to black pepper grain yield with the application of 72 and 78 kg ha-1 of N, for cultivars Cingapura and Bragantina, respectively. Only cultivar Guajarina responded to the phosphorus application. Growing levels of K2O, reduced the present potassium content in the foliar tissue of the peppers. The potassium addition favored the increase of the production of grains with the application of 42, 13 and 22 kg ha-1 of K2O, for the Cingapura, Bragantina and Guajarina cultivars, respectively.

Correction to “Modeling the effects of throughfall reduction on soil water content in a Brazilian Oxisol under a moist tropical forest”

Citation: Belk, E. L., D. Markewitz, T. C. Rasmussen, E. J. Maklouf Carvalho, D. C. Nepstad, and E. A. Davidson (2008), Correctionto ‘‘Modeling the effects of throughfall reduction on soil water content in a Brazilian Oxisol under a moist tropical forest,’’ WaterResour. Res., 44, W07701, doi:10.1029/2008WR007190.