Water is vital for plants. A reduction in water availability may affect crops transpiration and leaf growth. The objective of this study was to determine the response of transpiration and leaf growth to the fraction of transpirable soil water (FTSW) in two potato clones (an old and a new) adapted to Southern Brazil. Three experiments were carried out under a plastic shelter in Santa Maria, RS, Brazil, using two potato clones, an old (‘Macaca’) and a new (‘SMINIA793101-3’). Two of […]

The Technologies setting at Agricultural production system have the main characteristics the vertical productivity, reduced costs, soil physical, chemical and biological improvement to promote production sustainable growth. Thus, the study aimed to determine the variability and the linear and special correlations between the plant and soil attributes in order to select and indicate good representation of soil physical quality for forage productivity. In the growing season of 2006, on the Fazenda Bonança in Pereira Barreto (SP), the productivity of autumn […]

The arbuscular mycorrhizal association established between arbuscular mycorrhizal fungi (AMF-phylum Glomeromycota) and plant roots plays an essential role in plant survival and nutrition. In this review, the idea is outlined that the triad “riparian forest-carbon sequestration-arbuscular mycorrhizal fungi” should be taken into consideration as an environmentally compatible strategy for the recovery of areas formerly covered by riparian forests. We briefly discuss the soil classes found in riparian areas and the C input in terrestrial ecosystems. AMF play an important role […]

Continuous agricultural production in the Amazon region requires correction of soil acidity and understanding of the long-term interactions of liming with chemical soil properties. The objective of this study was to evaluate the immediate and residual effects of lime on annual crop production and soil properties of medium-textured Oxisols in the Brazilian Amazon. Field experiments were conducted at two locations in the Northeast of Pará from 2003 to 2008, one in the county of Terra Alta and the other in […]

Leaf analysis is the chemical evaluation of the nutritional status where the nutrient concentrations found in the tissue reflect the nutritional status of the plants. Thus, a correct interpretation of the results of leaf analysis is fundamental for an effective use of this tool. The purpose of this study was to propose and compare the method of Fertilization Response Likelihood (FRL) for interpretation of leaf analysis with that of the Diagnosis and Recommendation Integrated System (DRIS). The database consisted of […]

Nitrogen is the most important nutrient for rice (Oryza sativa L) yields. This study aimed to evaluate the response of upland rice cultivars to N rate and application times in a randomized block design, in subdivided plots with four replications. The studied factors were five rice cultivars (BRS MG Curinga, BRS Monarca, BRS Pepita, BRS Primavera, and BRS Sertaneja), three application times (100 % at planting, 50 % at planting – 50 % at tillering and 100 % at tillering) […]

Although phthalates are among the most common pollutants found in the environment, there are little data about bioremediation of tropical soils contaminated with phthalates. For this reason, the purpose of this study was to evaluate the bioremediation of an industrially used soil contaminated with Di-(2-ethylhexyl) phthalate (DEHP), diisodecyl phthalate (DIDP) and isobutanol, in São Paulo State. The bioremediation was based on indigenous soil microorganisms and inoculum adapted in a slurry phase reactor. The reactor was monitored for 120 days and […]

The SMP buffer contains p-nitrophenol and potassium chromate, both hazardous substances. A solution without toxic substances, the so-called Santa Maria buffer (TSM) was developed to reproduce performance of the SMP buffer used to estimate potential acidity of soils in Rio Grande do Sul and Santa Catarina (SMP-RS/SC). Acid titrations of the SMP- RS/SC buffer and various mixtures of the components of the new buffer were performed, using multiparametric regression analysis to obtain the optimal TSM composition. The efficiency of TSM […]

The cultivation of Elephant or Napier grass (Pennisetum purpureum) in the gypsum- producing region of Araripe, in the west of the state of Pernambuco in northeastern Brazil, may be viable as alternative energy, especially when the soil fertility is improved. The objective of this study was to evaluate the effect of crude gypsum on the nutritional status, mineral composition, biomass production, and nutrient uptake efficiency of elephant grass varieties in Araripe, Pernambuco. For this purpose, three elephant grass varieties: Cameroon, […]

The trampling of grazing animals can compact the surface layers and affect the physical quality of soils in crop-livestock systems (ICL). The hypothesis of this study is that increased trampling from animal grazing of oats and ryegrass reduces the soil physical quality of an Oxisol under no-tillage with ICL. The purpose of this study was to quantify bulk density (Bd), air-filled porosity (εa), soil air permeability (Ka), soil resistance to penetration (SR) and estimate an index of pore continuity from […]