Several studies were carried out to evaluate polymer-coated mineral fertilizers; however, few studies, on the agronomic efficiency of these fertilizers in the field in carrot crop, are available. Thus, we aimed to evaluate the use of enhanced-efficiency phosphorus fertilizer coated with polymers in carrot (Daucus carota). The experiment was carried out in field, in Ipameri-GO. The experimental design was randomized blocks, arranged in an incomplete factorial design (5x2)+1, considering five phosphorus doses (150, 300, 450, 600 and 750 ha-1 kg P2O5), two P sources [conventional MAP (monoammonium phosphate) and polymer-coated MAP (Policote)] and one additional treatment (control, without P). The evaluated traits were plant height, root length, root diameter, total productivity, marketable root classes, agronomic efficiency of phosphate fertilization and P content in the roots. Data were submitted to analysis of variance and regression. Phosphate fertilization did not influence the P content in carrot roots, but increased plant height, root length and diameter and yield of carrot roots. Polymer-coated phosphate increased plant height, length, diameter and productivity of carrot roots, when compared to conventional fertilizer. Carrot productivity was, on average, 15.5% higher with polymer-coated P source (39.42 t ha-1) than with the conventional P source (34.11 t ha-1). Marketable roots were also improved with the use of polymer-coated phosphate fertilizer. Phosphate fertilizer coated with polymer increased the agronomic efficiency of phosphate fertilization in the carrot crop.

Soybeans and maize are the most cultivated crops in tropical soils and require large amounts of phosphate fertilizers. The use of enhanced-efficiency fertilizers is a promising technology to minimize losses of P by fixation in highly weathered tropical soils. The objectives of this study were to evaluate morphological characteristics, soybean P and boron foliar content, yield and agronomic efficiency of P fertilizer in response to P rates and sources in maize and soybean crops. Two P fertilization experiments with the sources Mono-ammonium Phosphate (MAP) and Policote coated MAP were carried out, one in maize (0, 20, 40, 80, 120 and 160 kg P2O5 ha-1) and another in soybean crop (0, 20, 40, 80 and 120 kg P2O5 ha-1). The morphological characteristics, soybean P and boron foliar content, yield and agronomic P fertilizer efficiency were evaluated. The results showed that maize and soybean morphological characteristics, as well as soybean foliar P and boron contents were not influenced by fertilization. P fertilization increased soybean yield. Policote coated MAP was more efficient than MAP (conventional fertilizer) to produce higher maize and soybean yields and higher agronomic efficiency of P use. For higher productivity, we recommend the dose of 102.9 kg P2O5 ha-1 of Policote coated MAP for soybean and 97.6 kg P2O5 ha-1 for maize.

The Bell peppers is a tropical culture and it is in the 10 most consumed vegetables of the world. The mineral nutrition is essential to the productivity and better quality of the gather fruits. In bell pepper cultivation, high portions of nitrogen are essential to a good performance of fruits. The foliar fertilizing is a complement to the ground fertilizing. The amino acids are a good source of nitrogen, once these are quickly incorporated to the plants metabolism. Therefore, this work aimed to estimate the sources and portions of N to the foliar application in Bell pepper cultivar. The Randomized blocks design was utilized in a factorial scheme 2 × 4, with four repetitions. The first factor corresponded in two sources of N: urea and amino acids. The second factor corresponded to the number of repetitions by foliar: 0, 1, 3, 5 and 7 applications during the culture cycle. The first foliar application occurred ten days after the transplant, and the subsequent in breaks of fifteen days after the first application. In the test there was not application. The baselines evaluated: Cross length of fruits, fruits diameters, number of total fruits and productivity in kg ha-1. The results were submitted to variation and regression analysis. The application of amino acids by foliar in plants of Bell pepper, increased the diameter and the length of fruits. High sources of urea also provided morphological changes in fruits however lower amino acids utilization.

RESUMO - Este trabalho teve como objetivo avaliar o potencial uso de microrganismos rizosféricos em função de diferentes doses de fosfato aplicadas na adubação de semeadura da cultura do milho no campo experimental da Universidade Estadual de Goiás / Campus Ipameri. O delineamento experimental utilizado foi blocos casualizados, em esquema fatorial 5 x 2 com quatro repetições. Foram dez tratamentos, sendo cinco doses de P2O5 na adubação de semeadura (0, 20, 40, 80 e 160 kg de P2O5 ha-1) e dois tratamentos constituídos pela presença ou pela ausência da aplicação do biofertilizante (BACSOL® + ORGASOL®), contendo estirpes de bactérias e fungos rizosféricos. Por ocasião da colheita, foram realizadas as avaliações de matéria seca de planta, de matéria seca de espiga, de número de fileiras de grãos por espiga, de massa de 100 grãos, de teores de P na planta e nos grãos. Ocorreu efeito de doses em função da inoculação. Os benefícios da inoculação com microrganismos promotores de crescimento na massa seca da parte aérea, nos teores de P na planta e nos grãos do milho se manifestaram principalmente em condições de baixa disponibilidade, ou seja, nas menores doses de fósforo.Palavras-chave: Zea mays, adubação fosfatada, disponibilização de formas inorgânicas de fosfato, Cerrado.MICRO P-SOLUBILIZING CONTRIBUTION IN PHOSPHORUS ABSORPTION BY MAIZEABSTRACT – This study aimed to evaluate the potential use of rhizosphere microorganisms due to different doses of phosphate fertilizer applied at sowing of corn in the experimental field of the Universidade Estadual de Goiás/Unit Ipameri. The experimental design was randomized blocks in a 5x2 factorial scheme with four replications. The total of ten treatments comprised five levels of P2O5 at sowing fertilization (0, 20, 40, 80 and 160 kg P2O5 ha-1) in the presence or absence of the application of biofertilizers (BACSOL® + ORGASOL®) containing strains of rhizosphere bacteria and fungi. Plant dry matter ear, number of kernel rows per ear, weight of 100 grains, P content in plant and grains were evaluated at harvest. Effect of doses depending on the inoculation was observed. The benefits of inoculation with growth-promoting microorganisms in the dry mass of the aerial part, the P content in plant and corn grains occurred mainly in low availability conditions, ie in the lower phosphorus levels.Keywords: Zea mays, phosphate fertilizers, availability of inorganic forms of phosphates, Cerrado.

The aim of the study was to evaluate the agronomic and economic characteristics of broccoli following the application of boron (B) doses in the transplanting furrow with or without the application of poultry litter. The research was carried out in a Dystrophic RedYellow Latosol (Oxisol) from April to July 2015. The experimental design was randomized blocks in a 2 x 5 factorial arrangement, where the first factor was fertilization without or with poultry litter (0 and 10 t ha -1 ) and the second factor was the B dose (0, 2, 4, 6 and 8 kg ha -1 ), with three replicates. The broccoli cultivar used was the Avenger hybrid. The analyzed variables were B content in the inflorescence, leaves, and stem; total B content of the shoot; fresh and dry mass of the inflorescence, leaves and stem; inflorescence diameter; total and commercial yields; incidence of hollow stem; and economic aspects of fertilization. The poultry litter, on the average of all doses, increased the foliar B levels and the fresh mass of the broccoli inflorescences and leaves, providing a greater yield and gross revenue. The B levels in the inflorescences and leaves increased with the B dose regardless of fertilization with poultry litter but only increased in the absence of the organic fertilizer in the stems. The profitability index increased with the B dose up to 8 kg ha -1 in both the presence and absence of fertilization with poultry litter, but the more appropriate to farmers was the B dose of 8 kg ha -1 and 10 t ha -1 of poultry litter.

RESUMO - Este trabalho teve como objetivo avaliar o potencial uso de microrganismos rizosféricos em funçãode diferentes doses de fosfato aplicadas na adubação de semeadura da cultura do milho no campo experimental daUniversidade Estadual de Goiás / Campus Ipameri. O delineamento experimental utilizado foi blocos casualizados,em esquema fatorial 5 x 2 com quatro repetições. Foram dez tratamentos, sendo cinco doses de P2O5 na adubaçãode semeadura (0, 20, 40, 80 e 160 kg de P2O5 ha-1) e dois tratamentos constituídos pela presença ou pela ausência daaplicação do biofertilizante (BACSOL® + ORGASOL®), contendo estirpes de bactérias e fungos rizosféricos. Porocasião da colheita, foram realizadas as avaliações de matéria seca de planta, de matéria seca de espiga, de número defileiras de grãos por espiga, de massa de 100 grãos, de teores de P na planta e nos grãos. Ocorreu efeito de doses emfunção da inoculação. Os benefícios da inoculação com microrganismos promotores de crescimento na massa secada parte aérea, nos teores de P na planta e nos grãos do milho se manifestaram principalmente em condições de baixadisponibilidade, ou seja, nas menores doses de fósforo.Palavras-chave: Zea mays, adubação fosfatada, disponibilização de formas inorgânicas de fosfato, Cerrado.MICRO P-SOLUBILIZING CONTRIBUTION IN PHOSPHORUS ABSORPTION BY MAIZEABSTRACT – This study aimed to evaluate the potential use of rhizosphere microorganisms due to different dosesof phosphate fertilizer applied at sowing of corn in the experimental field of the Universidade Estadual de Goiás/UnitIpameri. The experimental design was randomized blocks in a 5x2 factorial scheme with four replications. The total often treatments comprised five levels of P2O5 at sowing fertilization (0, 20, 40, 80 and 160 kg P2O5 ha-1) in the presenceor absence of the application of biofertilizers (BACSOL® + ORGASOL®) containing strains of rhizosphere bacteriaand fungi. Plant dry matter ear, number of kernel rows per ear, weight of 100 grains, P content in plant and grainswere evaluated at harvest. Effect of doses depending on the inoculation was observed. The benefits of inoculation withgrowth-promoting microorganisms in the dry mass of the aerial part, the P content in plant and corn grains occurredmainly in low availability conditions, ie in the lower phosphorus levels.Keywords: Zea mays, phosphate fertilizers, availability of inorganic forms of phosphates, Cerrado.