Deficiência hídrica e adubação nitrogenada no cultivo do minimilho no cerrado

• Ano de defesa: 2020
• Autor(a) principal: Lira, Melkezedeque Alves
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Mato Grosso; Brasil; Instituto de Ciências Agrárias e Tecnológicas (ICAT) – Rondonópolis; UFMT CUR - Rondonopólis; Programa de Pós-Graduação em Engenharia Agrícola
• Palavras-chave em Português: Zea Mays L.; Evapotranspiração de referência; Doses de nitrogênio; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA; Reference evapotranspiration; Nitrogen doses
• Link de acesso: http://ri.ufmt.br/handle/1/3700

Baby corn is the name given to young ear of corn, before pollination. Its cultivation occurs in a cycle of 70 days, a period that frames the baby corn as a vegetable, being recognized as short, which may represent an option to supplement the income of small farmers. Nitrogen and water are some of the factors that most affect the development of crops in general. Thus, the objective was to study the influence of the use of nitrogen in relation to water deficiency in the cultivation of baby corn. The experiment was installed in subdivided plots, in a randomized block design in a 5x5 factorial arrangement and 4 repetitions, with 5 irrigation layers (21, 29, 37, 45 and 53% of the crop evapotranspiration (ETc)) and sub -plots with 5 doses of nitrogen (0, 50, 100, 150 and 200 kg ha-1). The first evaluation was carried out at 32 days after the beginning of the experiment and the second evaluation 15 days after the first. The harvest started at 68 days after sowing and was completed at 116 days after sowing. Non-destructive phytometric analyzes were performed, such as plant height, stem diameter, number of leaves and Falker® chlorophyll index at 32 and 47 days after sowing and number of ears, diameter, length, weight of spikelets with and without straw. during the harvest period, in addition to water use efficiency, and the data were analyzed with the aid of the SISVAR statistical program. No interaction was found between the factors for any of the variables analyzed. At 32 and 47 days after sowing the best results pointed to a higher efficiency of the dose of 150 kg ha-1 of nitrogen and 44% of ETc in the characteristics of growth and development of corn, while for the production of spikelets the adjustment was to the quadratic linear regression model for both irrigation levels and nitrogen doses, however, when the values of both factors increased, the spikelets produced were smaller, causing a greater number of spikelets to fit the pattern commercial. The maximum efficiency of water use was obtained with the application of a larger water layer and nitrogen dose for this experiment. The non-interaction between factors in all variables does not allow an adequate assessment of the influence of nitrogen in the cultivation of minimiho in conditions of water deficiency, being appropriate new experiments using higher doses of nitrogen and irrigation depths for a better evaluation of the baby performance under these conditions.