Produção de fitomassa do milho sob lâminas de irrigação e adubação nitrogenada

In many cultures, the plants are generally exposed to unfavorable environmental conditions, such as periods of drought stress, one handling that results in higher yields and better utilization of water resources is necessary. In this sense, it is aimed to study the formation of biomass corn hybrid AG1051, undergoing different water depths and nitrogen fertilization. In an experiment conducted in a greenhouse at the Academic Unit of Agricultural Engineering, Campus de Campina Grande, being assessed five levels of fluid replacement (40, 60, 80 100 (control) and 120% of the actual evapotranspiration - ETr) associated with four doses nitrogenous fertilizer (50, 75, 100 and 125 of the indication for testing in pot). Combined factors in randomized blocks, resulted in 20 treatments (5 x 4) with one plant per plot and three replications. The fresh weight of leaf, stem fresh biomass, fresh weight of shoot and leaf dry mass were assessed at 30 days after sowing. The obtained data were evaluated by analysis of variance test for 'F' at the level of 0.05 and 0.01 probability and in cases of significance, there was analysis of linear and quadratic polynomial regression using the statistical software SISVAR. The fresh weight of leaf and stem fresh weight are indicated variables for the study of drought stress in corn, because they are more sensitive to stress. The effects of different water depths on the corn crop resulted in higher growth and biomass formation when irrigated with over 80% of ETr blades. The irrigation management from 100% ETr is the most suitable for providing the highest accumulation of biomass corn. Nitrogen fertilization did not affect the growth variables in maize cv. AG1051. Em diversas culturas, as plantas geralmente estão expostas a condições ambientais desfavoráveis, tais como períodos de estresse hídrico, sendo necessário um manejo que resulte em maior produção e melhor aproveitamento dos recursos hídricos. Neste sentido, objetivou-se estudar a formação de fitomassa do híbrido de milho AG1051, submetidos diferentes lâminas de água e doses de adubação nitrogenada. Em experimento realizado em casa de vegetação da Unidade Acadêmica de Engenharia Agrícola, Campus de Campina Grande, sendo avaliados cinco níveis de reposição hídrica (40, 60, 80 100 (testemunha) e 120% da evapotranspiração da real - ETr) associado a quatro doses de adubação nitrogenadas (50; 75; 100 e 125 da indicação para ensaios em vaso). Combinados os fatores no delineamento em blo