Paulo Cesar Ocheuze Trivelin

• Abstract

  For modern agriculture the use of advanced nutrient management technologies, as well as the use of appropriate inputs at various productive environments are essentials to maintain yield and sustainability in agricultural systems once it aims to produce food, fiber and energy for a growing world population of around seven billion people. The researches proposed in this project are inserted…

  Special nitrogen fertilization managements in sugarcane, corn and common bean crops aiming to increase N use efficiency (NUE) and agricultural yield, AP.R

• Abstract

  Quantifying soil N mineralization is essential since soil organic matter is the main source of N to plants. Identifying highly responsible, moderately responsible and non-responsible sites to N fertilization, by means of soil N tests, allows develop a site-specifically N recommendation system in sugarcane, increasing the agroecosystems sustainability. This study aims to develop indexes of…

  Soil nitrogen mineralization as predictor of sugarcane n fertilizer requirements, AP.BIOEN.R

• Abstract

  Considering that the current knowledge on the response of the sugar cane yield to the N and S fertilization was obtained with experiments in only one cycle: plant cane or ratoon crop; that the sugar cane is a semi-perennial grass and as such it is dependent of the energy and nutrient reserves of the root system (roots and rhizomes) in order to sustain the vigor of ratoon plants; consider…

  Sugar cane yield in subsequent cycles associated to the residual effect of N and S and their transformations in the soil, on conservation system, AP.TEM

• Abstract

  The efficiency of use of fertilizer nitrogen (EUN) applied to the leaves of sugar caneis high, reaching 85% when compared to the EUN applied to the soil, an average of 25%.Currently, of the total nitrogen applied to the crop's stalk, about 32% is immobilized byorganic matter and only 25-26% is absorbed by the plant, which demonstrates the lowefficiency of the use of N by sugarcane (Otto e…

  Nitrogen utilization (15 N) by sugar cane from spraying foliar (n-urea) as a supplemental application of nitrogen, BP.IC

• Abstract

  The species of green manure belonging to the Fabaceae family are preferred among the cover crops due to Biological Nitrogen Fixation (BNF). The N fixed by the legumes can be transferred to the main (non-legume) crop used in crop rotation or intercropping systems in order to increase the N-use efficiency of the green manure. Thus, the overall objective of the work is to evaluate the nitrog…

  Nitrogen transfer in the intercropping system with organic cherry tomato and legumes in succession to corn-green, BP.DR

• Abstract

  Nitrogen (N) is the most required nutrient by maize and common bean, being necessary in low quantities at the beggining and in adequated quantities during the development of both crops. Urea is the main N source but it has a low N Use Efficiency (NUE) that is associated with N losses when this source is applied on the soil surface. A manner to increase NUE would be to use mixtures of poly…

  Nitrogen (15N) use efficiency for fertilization managements of maize and common bean using mixtures of polymer sulfur coated urea and conventional urea, BP.DR

(Only some records are available in English at this moment)

• Abstract

  Nitrogen is one of the nutrients that most limits plant biomass production, presenting an important function in the photosynthesis process. In order to increase the agricultural crops yield, high N-fertilizer rates are used. The N-fertilizer use efficiency (NUE) by plants is low, in the wheat and sugarcane crops is ~33 and 25%, respectively. The low NUE is explained by the N immobilizatio…

  Nitrogen absorption-redistribution and physiological consequences of urea applied on the wheat leaves, BE.EP.DR

• Abstract

  Rhizodeposition of nitrogen and carbon can increase the proportion of N and C in the soil and influence enzymatic activity, organic matter decomposition and, consequently, the availability of nutrients. The objective of this work will be evaluated (1) rhizodeposition of C and N of the cherry tomato and jack bean in monoculture and intercropping using the13C -15N double labelling method; (…

  Nitrogen and carbon rhizodeposition and enzymatic activity in the rhizosphere of the cherry tomato and jack bean (Canavalia ensiformis DC) in intercropping system, BE.EP.DR

• Abstract

  The input of sugarcane straw on the soil surface can increase the N immobilization due to the high C/N ratio of this residue. However, the application of N fertilizer on sugarcane ratoons can stimulate the soil microbial population, promoting the net N mineralization. Besides mineral N from the mineralization process, plants can uptake organic compounds with low molecular weight, such as …

  Dissolved organic nitrogen dynamics in sugarcane cropping soils, BE.EP.DR

(Only some records are available in English at this moment)