RESUMOObjetivou-se avaliar o efeito de diferentes doses de adubação nitrogenada e lâminas de irrigação em duas épocas de cultivo sobre a eficiência do uso da água (EUA) pelo milho doce no nordeste do Mato Grosso do Sul. O experimento foi conduzido em parcelas sub-subdivididas, tendo nas parcelas quatro lâminas de irrigação (50, 75, 100 e 125% da evapotranspiração da culturaETc), nas subparcelas quatro doses de nitrogênio em cobertura (0, 100, 200 e 300 kg ha -1 ) e nas sub-subparcelas duas épocas de cultivo (Inverno/Primavera e Verão/Outono), no delineamento em blocos casualizados, com quatro repetições. A época Verão/Outono proporcionou maiores eficiências do uso da água para o milho doce no nordeste sul-mato-grossense e o aumento da lâmina de irrigação proporcionou redução desse parâmetro. A adubação nitrogenada aumentou a eficiência do uso da água pelo milho doce na época Verão/Outono e a dose de 168,4 kg ha -1 maximiza esse parâmetro no Inverno/Primavera. Palavras-chave:Irrigação por gotejamento, EUA, Zea mays var. Saccharata Sturt. WATER USE EFFICIENCY BY SWEET CORN ON DIFFERENT IRRIGATION DEPTH AND TOP-DRESSING WITH NITROGEN ABSTRACTThe aimed was to evaluate the effect of different doses of nitrogen fertilization and irrigation depths in two cropping seasons on water use efficiency of sweet corn in Brazil. The experiment was conducted in of split plot scheme, having in the plots four irrigation depths (50, 75, 100 and 125% of crop evapotranspiration) and in the subplots, four nitrogen rates (0, 100, 200 and 300 kg ha -1 ) and in the sub-subplots, two cropping seasons (Winter/ Spring and Summer/Autumn), in the randomized blocks design with four replications. The Summer/Autumn season provides greater water use efficiency for sweet corn in northeastern

Before choosing the method of the estimate of reference evapotranspiraton (ET0) in a region, it is important to evaluate the degree of precision of the model. The present research aimed to evaluate the performance of 30 methods for daily ET0 estimate in the Cassilândia city, Brazil.

Irrigation and nitrogen fertilization are management practices that have positive results for the corn crop. This study aimed at evaluating the effect of nitrogen fertilization and irrigation on agronomic traits of sweet corn. Two experiments were carried out in two crop seasons (winter/spring and summer/autumn), in a split-plot design, with the main plots consisting of four irrigation levels (50 %, 75 %, 100 % and 125 % of the crop evapotranspiration - ETc) and subplots consisting of four nitrogen doses (0 kg ha-1, 100 kg ha-1, 200 kg ha-1and 300 kg ha-1), applied at the V3 and V8 stages, via urea, in a randomized blocks design experiment, with four replications. Leaf nitrogen content, root depth, plant height, stem diameter, ear yield and water use efficiency were evaluated. In the winter/spring season, nitrogen fertilization did not affect yield, while in the summer/autumn season the dose that maximized yield was 300 kg ha-1. Sweet corn showed better results when irrigated with replacements of 50 % and 125 % of ETc, respectively in the summer/autumn and winter/ spring seasons.

Proper irrigation management is crucial to obtain high yields of pea, since its cultivation is recommended in cold and dry seasons. Taking into account the great genetic diversity, we considered necessary to evaluate cultivars which best adapt to the intrinsic conditions of Cerrado Region, as it presents low fertility soil, long dry period in the winter, drought periods (veranicos) in rainy season, mainly in January and February (summer). Thus, the aim of this study was to evaluate adaptability of green-pea cultivars under different irrigation depths in Northeast Region of state of Mato Grosso do Sul. The experiment was installed in a split plot scheme, with four irrigation depths [50, 75, 100 and 125% of crop evapotranspiration (ETc)] and at subplots, four pea cultivars (Forró, Frevo, Pagode and Samba) in a randomized block design with three replications. Pod length, number and mass of grains per pod, number of pods per plant, plant length, productivity and efficiency of water use were evaluated. Excess water supply (water stress) or shortage (water deficit) can cause decrease in the productivity of pea crop for green grains, considering replacement of 114.81% of Etc, the most recommended for the crop. Cultivar Forró, showed the best productive performance in relation to other cultivars, in the climatic conditions of Southern Cerrado (Mato Grosso do Sul, Brazil).

PALAVRAS-CHAVE Biofertilizante Área de empréstimo Resíduos agroindustriais KEYWORDS BiofertilizerBorrow area Agro-industrial waste RESUMO: O presente trabalho teve como objetivo avaliar as alterações nos atributos químicos do solo promovidas por adição do biochar, pela adoção de culturas de cobertura e pelo residual da aplicação de lodo de esgoto em área com solo em processo de recuperação após remoção da camada superficial. O delineamento adotado foi definido em blocos casualizados, em esquema fatorial 6 × 2, seis tratamentos (T1 -Solo exposto; T2 -Gonçalo-alves (Astronium fraxinifolium Schott) + biochar; T3 -Gonçalo-alves (Astronium fraxinifolium Schott) + crotalária (Crotalária juncea) + biochar; T4 -Gonçalo-alves (Astronium fraxinifolium Schott) + feijão-de-porco (Canavalia ensiformis); T5 -Gonçalo-alves (Astronium fraxinifolium Schott) + lodo de esgoto (60 t ha -1 ) + Urochloa (Syn. Brachiaria) decumbens; T6 -Mata nativa de Cerrado) e duas épocas de coleta de solo. O solo foi amostrado em três camadas (0,00-0,05 m, 0,05-0,10 m e 0,10-0,20 m), nas quais foram determinados os teores de P, K, Ca, Mg e Al e os valores de pH, H+Al, SB, CTC, V% e m%. Houve acréscimo nos teores de K na camada de 0,05-0,10 m em função da aplicação do biochar, o qual não apresentou influência sobre as demais variáveis estudadas. A aplicação de lodo de esgoto em solo degradado e o manejo dessa área com braquiária propiciam aumento no teor de fósforo no solo. ABSTRACT: This study aimed to evaluate changes in the chemical attributes of the soil promoted by the addition of biochar and sewage sludge in land degraded by removal of the top layer, currently under recovery with cover crops and residual from the application of sewage sludge. The study design was set in randomized blocks with 6×2 factorial and six treatments (T1 -Exposed soil; T2 -Goncalo-alves (Astronium fraxinifolium Schott) + biochar; T3 -Goncalo-alves (Astronium fraxinifolium Schott) + (Crotalaria juncea) + biochar; T4 -Goncalo-alves (Astronium fraxinifolium Schott) + jack bean (Canavalia ensiformis); T5 -Goncalo-alves (Astronium fraxinifolium Schott) + sewage sludge (60 t ha-1)+ Urochloa (Syn. Brachiaria) decumbens; T6 -Cerrado Native Forest) and two seasons of soil collection. Soil samples were collected in three layers (0.00-0.05, 0.05-0.10 and 0.10-0.20 m), in which we determined the levels of P, K, Ca, Mg and Al, as well as levels of pH, Al+H, SB, CTC, m%, and V%. An