Efeitos da aplicação de nutrientes na produtividade e qualidade de sementes de soja

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Resposta do milho ao modo de aplicação e doses de nitrogênio, em sistema de semeadura direta

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Indicadores de qualidade de um latossolo vermelho e produtividade do milho sob sistemas de manejo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Mecanismos de distribuição do fertilizante e adubação nitrogenada em cobertura no arroz de terras altas em plantio direto

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Inoculação com Azospirillum brasilense, fontes e doses de nitrogênio na cultura do milho em duas épocas de semeadura

Pós-graduação em Agronomia - FEIS

Diagnose da composição nutricional e eficiência de fertilizantes nitrogenados na cultura do milho

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Resposta de cultivares de feijão comum à adubação nitrogenada

Pós-graduação em Agronomia (Agricultura) - FCA

Adubação nitrogenada, fosfatada e potássica na cultura do eucalipto (clone i144 - E. urograndis)

Pós-graduação em Agronomia - FEIS

Nitrogen fertilization management in no-tillage maize with different winter crops

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Produção de repolho em função de doses e fontes de potássio em cobertura

The objective of this research was to evaluate the effects of rates and sources of potassium in top dressing on yield of cabbage hybrid Kenzan. Two experiments were conducted (15/07 to 22/11/2010 and 28/09/2010 to 27/01/2011) and nine treatments, resulted from a factorial 4 rates (45; 90; 135 and 180 kg ha(-1) of K2O) x 2 sources (KCl and K2SO4) + 1 control (without K in top dressing) were evaluated at randomized block design, with 4 replicates. After the harvest, fresh and dry weight of cabbage head and of external leaves; leaf number (from cabbage and external); diameter and height of cabbage head were evaluated. It was evaluated soil chemical characteristics at the end of first experiment and content of macro and micronutrients in plants. It was observed that potassium rates and sources did not influence most of evaluated characteristics. K content in plant increased linearly with KCl application. Results obtained show that, probably, it is not necessary application of K in top dressing when base fertilization is done with this nutrient, besides existing recommendations for this crop.

Aplicações sucessivas de lodo de esgoto no girassol e efeito residual no trigo e triticale

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

Nitrogen fertilization (15NH4NO3) of palisadegrass and residual effect on subsequent no-tillage corn

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

SILICON IN ROW AND NITROGEN IN TOPDRESSING FERTILIZATION ON RICE UNDER DRY LAND AND SPRINKLER IRRIGATION CONDITIONS

The objective of this work was to evaluate the effects of silicon application adjusted with nitrogen fertilization via top-dressing on grain productivity, the silicon contents of the soil, in the plant tissue and nitrogen contents in dry and irrigated conditions. The experimental outlining was from designed blocks with subdivided parcels and four repetitions. The treatments consisted of culture system (dry and irrigated) and the under parcels by the combination of silicon (0 and 100 kg ha(-1)), in magnesium and calcium silicate form (with 23% of SiO2), and four doses of N (urea) via top-dressing (0, 30, 60 and 90 kg ha(-1)). Silicon application at sowing furrow was a viable technique because it provided significant increase in the content of this element in the root growth of rice. The application of silicon in the sowing furrow did not change the content of the element nor the nitrogen nutrition in rice plants. The nitrogen application reduced the silicon content and increased nitrogen nutrition in rice plants. Silicon application at sowing furrow provided no increase in rice grain yield. When there was no water limitation to nitrogen fertilization enhanced linearly on rice grain yield, whereas under water stress the effect of nitrogen fertilization was limited.

Produção e qualidade de batata-doce em função das doses e parcelamento da adubação potássica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Soil fertility, nutrition and early growth of physic nut as affected by nitrogen fertilization

The initial growth and mineral nutrition of the physic nut (Jatropha curcas L.) as a function of nitrogen (N) fertilization was investigated. The transplanting of seedlings was carried out in plastic pots filled with 50 dm3 of a Rhodic Hapludox, under a plastic greenhouse. In addition to a control treatment, the dosages of 0, 40, 80, 120, and 160 mg dm−3 N were tested. The results demonstrated that N fertilization for the cultivation of physic nut could be added as top dressing from 60 days after planting with a dosage of 65 mg dm−3. A SPAD index of 46 can be used as a nutritional reference to its initial development. Furthermore, the results suggested that the order of nutrient accumulation by the physic nut plants is as follows: potassium (K) > N > magnesium (Mg) > calcium (Ca) > phosphorus (P) > sulfur (S) > iron (Fe) > manganese (Mn) > boron (B) > zinc (Zn) > copper (Cu).