Paulo Cesar Ocheuze Trivelin

University of São Paulo | USP · Center of Nuclear Energy in Agriculture (CENA)

Ammonium has been reported as a ‘preferred’ nitrogen (N) source for sugarcane (Saccharum spp.), which can improve N use efficiency (NUE) in this crop. We aimed to evaluate the preferential uptake of ammonium and nitrate in sugarcane genotypes contrasting with NUE under controlled conditions. Four sugarcane genotypes previously selected by another e...

Key message Plantations of two multipurpose legume species markedly differ in stand development and functioning. The sustainability of tree plantations can be inferred from their ecological strategies along the fast-slow economic spectrum. Abstract Growing plantations with native trees is crucial for ecosystem restoration and wood and non-wood pro...

The use of 15 N tracers in blends of N-fertilizers contributes to determining the N derived from each N-fertilizer in the plant, improving the recommendation in the field. However, to evaluate the contribution of two 15 N-labeled fertilizers to maize nutrition is an expensive process, and it is challenging to manufacture 15 N-labeled controlled-rel...

Early nitrogen (N) application on live cover crops or their residues is a potential alternative for supplying N demand while enhancing the yield of subsequent cash crops in tropical regions. The objective of applying N on live forage grasses or their residues to no-till (NT) systems is to promote the gradual release of N via straw decomposition to...

Water and nitrogen (N) availability are determining factors for crop development and production. Assessments of sugarcane yield loss based on these factors may become more accurate by using the stable carbon (C) isotope technique. The aim of this work was to evaluate the effect of N and water on sugarcane yield, isolating the yield losses (YL) caus...

This study evaluated the productivity and nutrient concentrations of organic cherry tomatoes and leguminous green manures grown in intercropping systems in rotation with maize. The experimental design was a complete randomised block design with five replications and eight treatments, as follows: monocrop of cherry tomato adding residual maize crop...

The aim of this study was to investigate the transfer of N from different legumes to cherry tomatoes in the intercropping system under residual straw of the previous green corn crop using the 15N natural abundance method. We also investigated the temporal variation in nitrogen transfer to a cherry tomato, the biological nitrogen fixation (BNF) of l...

The development of integrated crop-livestock systems (ICLSs) under no-tillage (NT) is of global interest for improving agroecosystem sustainability in tropical regions. In these crop systems, nitrogen (N) is the most essential nutrient. Nitrogen needs vary according to environmental conditions and crop rotation and are higher when crop succession i...

Current knowledge indicates that sugarcane straw is a short-term sink of fertilizer nitrogen (N) due to N immobilization during the decomposition process. This study aimed to determine whether sugarcane straw removal from the field benefits the N-fertilizer recovery by plant (NRP), and if legume cultivation will further improve NRP. Half of a field...

A single application of polymer-sulfur coated urea (PSCU) and conventional urea (U) is expected to ensure nitrogen (N) throughout the maize (Zea mays L.) growth cycle being U the likely main N-fertilizer supplier at the beginning and PSCU during the maize growth cycle. This research aimed to evaluate N fertilization management (split, incorporated,...

The common bean (Phaseolus vulgaris L.) requires nitrogen (N) during its vegetative and reproductive stages. A single application of a blend of polymer-sulfur coated urea (PSCU) and conventional urea (U) treated with NBPT (N-(n-butyl) thiophosphoric triamide) can meet that demand. Broadcast application could improve yield than other N management pr...

Soybean [Glycine max (L.) Merr.] grain yield is closely associated with the level of optimal nitrogen (N) supply, especially during the reproductive stages. Foliar fertilization with low rates of N have been considered as a strategy for furnishing additional N and enhancing grain yields. Field studies using 15N tracer were conducted over two growin...

This study checked the nitrogen (N) uptake, fate of the N fertilizer, fertilizer recovery efficiency (FRE) and the residual amount of N fertilizer in the soil via 15N-labelled fertilizer applied to soybean (Glycine max L. Merr.), to explain any differences in the yields. Two soybean field experiments were established in Brazil, one conducted in a t...

Crop rotation associated with the use of cover crops promotes the introduction of crop residues to the soil, with direct and indirect effects on the availability of plant nutrients, especially nitrogen (N). The objectives of this study were to estimate the N utilization from 15N-urea and cover crop residues (labelled with 15N) of maize crops grown...

Molybdenum (Mo) can stimulate nitrogenase activity (NTA), increase biological nitrogen (N) fixation (BNF) and reduce natural-abundance N isotopes (δ¹⁵N). Our hypothesis is that this stimulus depends on genotype and N availability for sugarcane. The objective of this study was to evaluate the effect of the Mo fertilization on BNF, NTA, δ¹⁵N and the...

Polymer coated urea (PCU) have the potential to increase nitrogen (N) use efficiency (NUE) by the release of N following crop demand while reducing losses by volatilization, leaching and denitrification. However, the NUE of PCU is still unclear especially in systems of corn-palisadegrass intercropping. Broadcast application of urea result in ammoni...

Functional specialization of fine roots was found for Eucalyptus grandis trees at harvesting age (6 years) on tropical soils. Aiming to elucidate whether functional specialization is a ubiquitous feature of eucalypts, we focused on its changes with ontogeny, tree nutrient status and soil depth. We studied the potential uptake of N, K and Ca by 2-ye...

The objective of this work was to evaluate the effect of the application of ammonium chloride as a nitrogen source for sugarcane (Saccharum sp.) on the development of the crop’s shoot and roots during two consecutive cycles. The experiment was conducted on a Typic Hapludox in the first and second sugarcane ratoons. The treatments consisted of four...

N Fertilizer recommendations must be improved to optimize N use efficiency (NUE) for bioenergy crops. A study was conducted to test the hypothesis that sites varying in historical usage of by-product differ in soil N-supplying power and sugarcane (Saccharum spp.) responsiveness to N fertilization. Our aim was to quantify soil N availability and N f...

Best fertilizer management practices such as adopting the right N sidedress timing can reduce N losses by volatilization, thus, raising N-fertilizer recovery and grain yield. To evaluate ammonia (N-NH3 ) losses, N-fertilizer recovery and grain yield as a function of urea sidedress timing in corn, a field study was conducted during the 2011-2012 and...

Although Brazilian sugarcane crops use lower nitrogen rates when compared to other producing countries, the biological nitrogen fixation (BFN) could be performed aiming to reduce costs, since almost all nitrogen fertilization used in Brazil is imported. BFN can occur in sugarcane; however, its role in non-leguminous plants is controversial. Therefo...

Although Brazilian sugarcane crops use lower nitrogen rates when compared to other producing countries, the biological nitrogen fixation (BFN) could be performed aiming to reduce costs, since almost all nitrogen fertilization used in Brazil is imported. BFN can occur in sugarcane however, its role in non-leguminous plants is controversial. Therefor...

Key message: Inter-specific interactions with eucalypts in mixed plantations increased N2fixation rate of acacia trees compared to monocultures. N2fixation was higher during the wet summer than during the dry winter both in acacia monocultures and in mixed plantations. Context: Introducing N-fixing trees in fast-growing tropical plantations may con...

Early fertilizer nitrogen (N) application on cover crops or their residues during the off-season is a practice adopted in Brazil subtropical conditions under no-tillage corn (Zea mays L.) systems. However, the effect of early N application on yield, plant N content, and N recovery efficiency (NRE) for corn is not yet well documented. Five fertilize...

Grain yield, plant N content and N derived from fertilizer (NDFF) among all the treatments. (XLSX)

Land area devoted to sugarcane (Saccharum spp.) production in Brazil has increased from 2 million to 10 million ha over the past four decades. Studies have shown that, from an environmental perspective, the transformation of nitrogen (N) fertilizers into N2O gases can offset the advantages gained by replacing fossil fuels with biofuels. Our objecti...

In Brazil, N fertilisers are applied onto the surface of the sugarcane (Saccharum spp.) litter layer, which represents a large portion of the C stored in the agroecosystem. However, little is known about the influence of mineral N on decomposition of organic C compounds and mineral N transformations in the litter-soil transition zone. This investig...

Knowing the right fertilizer N source is a key management practice for improving nutrient use and productivity for sugarcane (Saccharum spp.). Therefore, this study evaluated the effect of fertilizer N sources on aboveground biomass (BM) and nutrient (N, P, K, Ca, Mg, and S) content for sugarcane ratoon. Two field trials under highly weathered trop...

Unraveling nutrient imbalances in contemporary agriculture is a research priority to improve whenever possible yield and nutrient use efficiency in sugarcane (Saccharum spp.) systems while minimizing the costs of cultivation (e.g., use of fertilizers) and environmental concerns. The main goal of this study was therefore to investigate biomass and n...

Retaining the mineral N in the form of NH4+ in the soil for a lengthy period is desirable for reducing losses. Furthermore, there is evidence that sugarcane prefers NH4+-N in place of NO3−-N. This study aimed firstly, to evaluate the potential of root extracts of Bracchiaria humidicola andSaccharum spontaneum, in contrast with the DCD (Dicyandiamid...

The low effectiveness of nitrogen fertilizer (N) is a substantial concern that threatens global sugarcane production. The aim of the research reported in this paper was to assess the residual effect of N-fertilizer applied at sugarcane planting over four crop seasons in relation to sugarcane crop yield. Toward this end three field experiments were...

Potassium (K) is an important limiting factor of tree growth, but little is known of the effects of K supply on the long-distance transport of photosynthetic carbon (C) in the phloem and of the interaction between K fertilization and drought. We pulse-labelled 2-year-old Eucalyptus grandis L. trees grown in a field trial combining K fertilization (...

Background and aims Foliar nitrogen (N) fertilization of soybean crops is a practice that is being adopted in Brazil because soybean crops require N during the reproductive stages and certain soils have low N availability and reduced biological N fixation (BNF). Thus, low rates of leaf N are being used without scientific evidence for supporting the...

The description of the fate of fertilizer-derived nitrogen (N) in agricultural systems is an essential tool to enhance management practices that maximize nutrient use by crops and minimize losses. Soil erosion causes loss of nutrients such as N, causing negative effects on surface and ground water quality, aside from losses in agricultural producti...

Brazil is recognized as a prominent renewable energy producer due to the production of ethanol from sugarcane. However, in order for this source of energy to be considered truly sustainable, conservation management practices, such as harvesting the cane green (without burning) and retaining the trash in the field, need to be adopted. This managemen...

The aim of this study was to evaluate the response of sugarcane to nitrogen (N) application with drip irrigation and the relation with carbon isotope discrimination (D 13 C), aboveground dry matter cane yield and the N balance in consecutive ratoon crops of sugarcane. An experiment was set up in Jaú, SP, Brazil, in which the second and third ratoon...

With the ordinance that prohibits sugarcane harvesting with prior burning of plantations in Brazil, sugarcane crops absorbs barely 20 % of the N-fertilizer applied. This low recovery is attributed, in part, to nitrogen (N) mineralization in plant straw, high microbial immobilization, and N losses in the soil-plant system, mainly, when sources conta...

Current limitations on the use of conventional N fertilizers on sugarcane (Saccharum spp.) in Brazil require the search for alternative sources with adequate N use efficiency. Field experiments were conducted in Typic Hapludox (TH) and Typic Eutrustox (TE) soils in São Paulo State, Brazil, to evaluate the dynamics of soil mineral N, N uptake, and s...

The nitrogen (N) requirement for sugarcane is based on response to fertilization and the extraction of N obtained in the harvest, but few studies evaluated the dry matter and nitrogen accumulation through the growth cycle. The objective of this study was to evaluate plant dry matter (phytomass) and N accumulation in the above ground part in respons...

Starting from the hypothesis that nitrogen fertilization favors the mineralization of crop residues, it consequently contributes to crop nutrition. The objective of this study was to evaluate the utilization of N derived from crop residues (trash-15 N) by sugarcane in relation to nitrogen fertilization. The experiment was carried out at the São Mar...

Sugarcane, as a semi-perennial crop, depends on the nutrient stocks in the root system in order to support the initial growth of sprouts, and there is evidence of a direct relationship of these nutrient stocks with the management of nitrogen fertilization. However, there is little knowledge about the amount of N fertilizer applied in a crop season...

O presente trabalho foi conduzido no período de novembro de 2006 a junho de 2010, com objetivo de avaliar a produção de cana-de-açúcar, em três ciclos agrícolas consecutivos, após pré-cultivo de espécies adubos verdes. Os adubos verdes Crotalária-júncea, e Guandu IAC-fava larga apresentaram a maior produção de material vegetal fresco e seco. Para a...

Fruit yield of citrus is largely dependent on nitrogen fertilization, which it plays an important role in tree nutrition. An experiment was carried out in lysimeters (320 L), with 3-yr-old 'Valencia' sweet orange [Citrus sinensis (L.) Osbeck] and 'Lisbon' lemon (C. limon L.) trees grafted on 'Swingle' citrumelo [C. paradisi Macfad. x Poncirus trifo...

INTRODUCTION Regardless of nitrogen N rate applied in sugargane, the effectiveness of N used by plant is almost always less than 50%, which is lower than that observed in most other crops, data among 50 and 70% (CANTARELLA et al., 2007). This variation and the low N utilization may be related losses of N in agroecosystem, originated for instance in...

Nitrogen is required in large amounts by plants and their dinamics in corn and perennial forages intercropped is little known. This study analyzed the efficiency of nitrogen fertilization (15NH4NO3) applied after corn grain harvest to palisadegrass (Brachiaria brizantha cv. Marandu) in intercrops sown at two times, as well as the N residual effect...

We analysed the effect of soil management and depth on potential gross nitrogen mineralization (GMR), nitrification (GNR) and consumption rates (GCR), and their relationships with organic matter particle-size fractions [>200μm, light (LF) and heavy (HF), 50-200, light (LF) and heavy (HF), 20-50μm and <20μm]. The experimental site was under conventi...

Sugarcane is used worldwide for sugar, ethanol and energy production. In Brazil, the shift from burned to unburned harvest systems resulted in increases in nitrogen fertilization rates, which can impact root architecture and biomass. The expectation is also an increase in sugarcane bio- mass. The study hypothesized that high N rates applied to suga...

It is expected that an improvement in nitrogen (N) uptake by plants would occur if sulphur (S) availability in the soil solution is non-limiting. In this study, sugarcane (plant crop) responses to N were studied at different levels of S application. The experiment was performed in Piracicaba city (São Paulo State, Brazil), from May 2004 to Septembe...

The 15N gas flux method can be used to determine the emission factor of N2O being unnecessary the inclusion of treatments without the application of fertilizer. In Brazil, the world’s largest sugarcane producer, it is common the use of vinasse (liquid waste from ethanol production) as organic fertilizer for the crop, and this practice can increase...

The response of corn plants and the correlation between shoot variables in response to the nitrogen fertilization is an important issue for yield maximization. A corn experiment was conducted under field conditions, from 2011 to 2012, in Piracicaba/SP, Brazil.Treatments were sidedressing with N-urea at different growth stages (V4, V6, V8, V10 and V...

The use of controlled release urea can achieve better synchronization between the corn needs and the availability of nitrogen (N) in the soil. To evaluate the effect of two sources of N, polymer coated urea (PCU) and conventional urea (U), on the availability of soil N-nitrate (N-NO3-) throghout the corn cycle, an experiment was carried out in the...

The adequate nitrogen (N) supply to corn crops plays important role in high yielding environments. However, N improper usage can result in poor fertilizer N use efficiency, profitability and hazardous environmental effects. Polymer coated urea (slow-release urea, PCU) has proven to be an effective approach in increasing nitrogen use efficiency in a...

This study aimed to evaluate the foliar uptake of ammonia derived from urea applied to the surface in different growing stages of maize, and to verify the correlation between the amount absorbed and leaf area. The study was carried out under field conditions in Piracicaba, State of Sao Paulo, Brazil, in the 2011/12 and 2012/13 growing seasons. We u...