Simulação da produtividade de cana-de-açúcar (Saccharum officinarum L.) na região nordeste do Brasil, utilizando o modelo DSSAT

The objective of this study was to simulate the potential stem and sugar yield of sugar cane (Saccharum officinarum L.) in the Northeastern Brazil (Petrolina-PE and Teresina-PI) and analyze 4 varieties in different planting seasons in two environments: irrigated and rainfed cultivars. The model of simulation was DSSAT/CANEGRO (Decision Support System for Agrotechnology Transfer) and the four sugar cane varieties were as follows: RB86 7515, CTC 4, CTC 7 and CTC 20 (all in 1.5 year cycle). Analysis of variance was performed on the results and means were compared using the Tukey test with probability level at 5%. March is the recommended month for planting in Teresina, PI. In Petrolina, PE, rainfed planting is not advisable because of the extended water deficit all year long. In an irrigated environment, no difference was found concerning stem yield as a function of planting season, for all varieties in the study regions. The stem and sugar yields were always higher in irrigated environment as compared with those in rainfed environment in all municipalities and study varieties. The simulation model provided good estimate of stem and sugar yields as compared with experimental data in Teresina, PI.

Desempenho operacional de semeadora e produtividade do milho em plantio direto e cultivo mínimo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeito de fungos contaminantes na produtividade de dois isolados de Agaricus blazei em duas formulações de composto

The effect of the contaminant fungi Trichoderma sp. and Chaetomium olivacearum on the cultivation of the ABL 99/30 and ABL 04/49 isolates of A. blazei in two compost formulations made up with tyfton (Cynodom dactylon) and oat (Avena sativa) was evaluated. The experimental design was a totally randomized 2 x 2 x 3 factorial design with 6 repetitions. The experimental unit consisted of 12-12.5 kg of wet compost. During the spawning, 150 g of Trichoderma sp. and C. olivacearum were added to the compost. The experiment was carried out in a climatized room, with humidity between 75-90% and temperature of 28º C. The productivity averages of the ABL 99/30 isolate of A. blazei were higher than those of ABL 04/49 and Trichoderma sp. and C. olivacearum negatively influenced the production of A. blazei. The different composts (based on tyfton and oat straw) did not influence the production of basidiomata.

Crescimento e produtividade do girassol na segunda aplicação de lodo de esgoto em diferentes manejos

Sewage sludge, as a soil fertilizer for crop production, has become a very important agricultural input since it is rich in nutrients, adds carbon to the soil and improves its chemical, physical, and biological characteristics. The aim of this study was to evaluate the effects of sewage sludge applied as a fertilizer for two consecutive years on sunflower plant growth and productivity. The experiment was conducted at the Experimental Farm of the College of Agriculture, a unit of the São Paulo State University (UNESP), in São Manuel, state of São Paulo, Brazil. The soil where the experiment was set is a Red Oxissol. The experiment consisted of 6 treatments with 5 replications. The experimental units were distributed in the field according to a randomized complete block design. ‘HELIO 251’ was the sunflower cultivar used in the experiment. The treatments were as follows: T0: check (no nitrogen applied); T1: conventional chemical fertilization; T2: 50% of the N dose from sewage sludge and 50% from a chemical fertilizer in side dress application; T3: 100% of the N dose from sewage sludge; T4: 150% of the N dose from sewage sludge; T5: 200% of the N dose from sewage sludge. The 150% of the N dose from sewage sludge treatment caused the plants to increase in height, in stem diameter, and in number of leaves per plant. The mixture in equal proportion of sewage sludge and a chemical fertilizer (treatment T2) resulted in an achene yield higher than that of the chemical fertilizer alone (treatment T1).

Efeito da adubação nitrogenada na produtividade do girassol

Nitrogen, along with K, is the most limiting nutrient for sunflower productivity. The objective of this research work was to determine the best level of nitrogen in a fertilization formula for the cultivation of sunflower of the ‘HELIO – 251’ cultivar. The fertilization procedure was that recommended for the state of São Paulo for sunflower crop, except that, in each one of the treatments, N doses were of 50, 70, 90, 110, and 130 kg ha-1 . These treatments were distributed in the field according to a randomized complete block design with 4 replications. The N dose which resulted in the highest grain yield, highest oil content, and plant dry matter was of 100 kg ha-1 . Leaf N content and 1,000 grains weight increased with N doses.

Eficiência da cokrigagem na estimativa da produtividade do café conilon

The objective of this research was to estimate the productivity (PRODUT) in sc/ha of coffee conilon through the technique of cokriging, using as covariate the production of humid coffee (PROD) in kg and compare the results with estimates obtained by kriging ordinary. The study was conducted in a commercial area of conilon coffee, Coffea canephora Pierre var. conilon, located in São Mateus Municipality, Espirito Santo State. For the field work was sampled the humid coffee production in a sampling grid irregular of 18.5 ha, 87 sampling points in the total. We also determined the production of dry coffee beans and coffee benefited 12% moisture, to obtain the PRODUT variable. After exploratory data analysis, which showed the correlation between variables in the order of 0.899, was performed variogram analysis. Were adjusted theoretical variograms to PROD and PRODUT and cross variogram between two variables. Finally we estimated the value of productivity, both by ordinary kriging as per cokriging. The validation of the estimation by cokriging not shows, however, significant gains in relation to validation by ordinary kriging.

Doses e épocas de aplicação de nitrogênio: Influência na relação C/N da palhada no desenvolvimento e produtividade do milho em sistema plantio direto

The objective of this research work was to evaluate the effects of doses and time of application of N on the C/N ratio of the straw cover and on the growth and productivity of maize plants growing in a no tillage system. The experiment was carried out at the Experimental Farm of the College of Agriculture of the São Paulo State University (UNESP) on its campus of Botucatu, state of São Paulo, Brazil. The treatments were distributed in the field according to a randomized complete block design in a split plot arrangement. The treatments consisted of four doses of N (0, 20, 40, and 60 kg ha-1 ) applied to oat crop and N doses (60, 80, 100, and 120 kg ha-1 ) sidedressed to corn. The development and productivity of the maize crop in a no-tillage system were found to be dependent of the C/N ratio and the straw cover. The response of the maize plants to the early application of N is dependent on doses and time of application.

Modelos agrometeorológicos para previsão da produtividade e qualidade de bebida natural do cafeeiro

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Identificação de regiões polimórficas para alta produtividade de mel e sequênciamento genômico em abelhas Apis mellifera africanizadas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Produtividade e perfil químico de óleo essencial de acessos de Varronia curassavica Jacq. em diferentes horários de coleta e período sazonal

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Acúmulo de macronutrientes e produtividade de genótipos de cártamo (Carthamus tinctorius L.) em função da adubação nitrogenada no sistema plantio direto

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fatores de risco relacionados à perda de produtividade laboral e aumento dos custos ambulatoriais de pacientes atendidos por unidades básicas de saúde

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Qualidade de vida no trabalho em empresa automotiva: comparação entre área administrativa e de produção

Pós-graduação em Engenharia de Produção - FEG

Análise da produtividade agrícola da cana-de-açúcar nos estados de Mato Grosso do Sul e Goiás

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Produtividade e qualidade de grãos da cultura do feijão em função do uso de fertilizante nitrogenado de liberação lenta via foliar

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)