The boron (B) fertilization in soybean is important to ensure great yields. Boron correction must be applied in deficient soils repairing losses, exports and leaching. The objective of this study was to evaluate the effects of doses, methods and times of application of B in soybean B content and yield. The field experiments were conducted during the 2015/16 and 2016/17 cropping seasons and set as a randomized block design with nine treatments (0, 0.5, 1, 1.5, 2 kg ha-1 of B, 0.5 kg ha-1 of B mixed with NPK (02-28-18) in furrow during sowing, foliar application with 0.3 kg ha-1 of B in V4 soybean stage, foliar application with 0.3 kg ha-1 of B in R1 soybean stage, and foliar application of 0.15 kg ha-1 in V4 plus 0.15 kg ha-1 of B in R1 soybean stage) and four replications. Boric acid was the B source and the variables analyzed were: B leaf content, B exported in seeds, number of pods per plant, number of seeds per pod, weight of 100 seeds (g) and productivity (kg ha-1). The levels of B in leaf were between 30.1 and 43.8 mg kg-1 and between 65.0 and 92.6 mg kg-1 in the 2015/16 and 2016/17 growing season, respectively. Exports of B in seeds were estimated between 166 and 248 g ha-1 and between 208.9 to 260.8 g ha-1 in the 2015/16 and 2016/17 growing season, respectively. Great productivity (3,820 kg ha-1) was observed in the 2016/17 growing season, with an estimated dose of 0.95 kg ha-1 of B.

Nitrogen (N) is one of the nutrients absorbed in great quantity by maize crop. Also, N fertilizers are of high costs and subject to large losses into the agricultural environment. There are various categories of fertilizers known as fertilizers of improved efficiency that can minimize such N losses. The objective of this study was to evaluate the effect of different sources and doses of N in maize agronomic performance. The experiment was installed in randomized blocks, with four replications, designed as a factorial 5 x 5 + 1, constituted by five N sources (urea, urea polymerized, urea with NBPT, organomineral with and without NBPT), five N doses (40, 80, 120, 160, 200 kg ha-1) plus a control (no N supply). The chlorophyll contents and grain yield were evaluated. The results showed no differences for the different N sources, indicating that the organomineral sources are as efficient as the mineral sources. The addition of N fertilizers in increasing doses, regardless of the source tested, has increased the levels of chlorophylls and grain yiled.

A cana-de-açúcar (Saccharum officinarum) tem se expandindo para solos marginais em atendimento à alimentação animal, humana e, consumo de etanol. Está entre as principais espécies agrícolas produzidas no Brasil, que é o maior produtor mundial. Utilização de fertilizantes organominerais oriundos de lodo de esgoto representa alternativa para manter ou melhorar a sustentabilidade da produção dessa cultura. Realizou-se experimento em delineamento em blobos casualizados, com esquema fatorial 5x2+1, com quatro repetições. Os tratamentos consistiram de combinações em função da recomendação de adubação mineral em 0; 60; 80; 100 e 120% da fonte organomineral oriundo de biossólido (lodo de esgoto), com e sem bioestimulante, + tratamento testemunha 100% mineral. Avaliaram-se os parâmetros biométricos perfilhamento, diâmetro de colmo e, altura de plantas. Não houve diferença quanto a fonte organomineral e mineral para perfilhamento. O diâmetro de colmo não apresentou significância para os percentuais de recomendação organomineral e mineral. Percentual de 80% da recomendação associado ao uso do bioestimulante proporcionou a maior altura de plantas, 2,49 metros.Palavras-chave: lodo de esgoto, perfilhamento, diâmetro do colmo, altura de plantas, Saccharum spp., Stimulate®.

Corn has great relevance for agribusiness as it is used in human and animal food, besides the energy matrix. The objective of this study was to assess the leaf content of macro and micronutrient, accumulation of primary macronutrients, production components and productivity with the application of pelleted organomineral fertilizer in different doses compared to mineral fertilization, in two soils of different textures in the corn crop. Two trials were conducted in the municipality of Uberlândia-MG-Brazil: one located near the highway BR 452 km 141, at the coordinate 18°55′26″S, 48°09′36″W, clay soil. The other at km 640 of BR 365, at coordinate 18°54′05″S, 48°25′20″W, sandy soil. A randomized block design with five replications was used, with five doses of organomineral fertilizer (40, 60, 80, 100 and 120% of the recommended dose of P2O5 for corn) and an additional with 100% of the recommendation of mineral P2O5, total of six treatments and 30 plots. The results showed that, with the exception of phosphorus leaf content, yield in the sandy texture and the number of grains per row in the clay texture, there was no difference between the doses of phosphate organomineral and did not differ from the mineral. Thus, phosphate organomineral is as efficient as mineral for phosphorus supply.

Os sistemas silvipastoris (SSP) compreende às técnicas de produção que interagem as árvores, plantas forrageiras, e os animais em um mesmo local. A pecuária e o sistema silviculturais são realizados juntamente para a geração de produção. Na suinocultura, é