Características Agronômicas Do Milho Submetido a Fontes E Parcelamento De Nitrogênio Em Cobertura

Abstract

RESUMOO objetivo deste trabalho foi avaliar as características agronômicas de milho (Zea mays L.) submetido a seis níveis de parcelamento de adubação nitrogenada. O experimento foi conduzido na área experimental do Colégio Técnico de Teresina, localizado em Teresina -PI, utilizando um delineamento em blocos ao acaso no esquema fatorial, sendo os tratamentos seis tipos de parcelamento de N aplicados em cobertura (sem aplicação, 1 aplicação, 2 aplicações, 3 aplicações, 4 aplicações e 5 aplicações), utilizando dois tipos de adubos nitrogenados (sulfato de amônio e ureia). A semeadura foi realizada com a cultivar BM 3061 e foram avaliados os seguintes parâmetros da planta: número, produtividade, diâmetro, comprimento de espigas verdes, altura de planta e altura de inserção da primeira espiga. Em todas as variáveis, exceto altura de inserção da primeira espiga, o sulfato de amônio promoveu melhores resultados do que a ureia. Avaliando o parcelamento do sulfato de amônio, o mesmo não influenciou no diâmetro e no comprimento de espigas. No entanto, a partir de 3 adubações em cobertura desse adubo, já é possível promover melhor produtividade de milho verde na região. Palavras-chave:Zea mays, adubos, sulfato de amônio, ureia, espigas AGRONOMIC CHARACTERISTICS OF CORN SUBMITTED TO SOURCES AND INSTALLMENT OF NITROGEN IN COVERAGE ABSTRACTThe objective of this study was to evaluate the agronomic characteristic of corn (Zea mays L.) submitted to six levels of nitrogen fertilization installment. The experiment was conduct in the experimental area of the College of Technical Teresina, located in Teresina -PI, using a design in randomized blocks in factorial design, with the treatments six types of splitting of N applied in coverage (without application, application 1, 2 applications 3 applications, 4 applications and 5 applications), using two types of nitrogen fertilizers (ammonium sulfate and urea). The sowing was carry out with the cultivar BM 3061 and were assess the following plant parameters: number, productivity, diameter, length of green ears, plant height and height insertion of the first ear. In all variables except height of the first ear insertion, ammonium sulfate promoted better results than urea. Evaluating the division of ammonium sulfate, it did not affect the diameter and length of spikes. However, from 3 topdressing fertilizer this, it is possible to better promote green corn yield in the region.

Desenvolvimento inicial do milho em resposta a adubação complementar de rochagem

“…), é um dos cereais mais cultivados em todo o mundo, cuja cultura é implementada em países em condições climáticas e de manejo diversas (Silveira et al, 2015;Almeida et al, 2017). Além disso, a cultura é de grande importância devido às inúmeras formas de utilização deste grão seja na forma in natura ou processada (Portela et al, 2016).…”

Nitrogen fertilization split in green corn under rainfed system

“…Due to its versatility, corn adapts to different production systems, presenting a great economic importance, being used in several ways, since animal feeding to the high-tech industry (Embrapa, 2015;Portela et al, 2016). It is one of the most cultivated and consumed cereals in the world, both for its productive potential, as well as for its chemical composition and nutritional value (Barrios & Basso, 2018;Fernandes et al, 2007).…”

“…Nitrogen fertilization split in green corn under rainfed system Although corn is an input for a variety of products, the pork and poultry production chains consume approximately 70 to 80% of the corn produced in Brazil (Embrapa, 2015). However, the destination of this grain for human consumption is also of great importance, especially in the Northeast region, where the cultivation of corn and the commercialization of ear of green corn enables the addition of value to the product, allowing the producer to acquire a higher price than that of the corn destined for grains (Rocha et al, 2011;Portela et al, 2016). Thus, this product can be consumed both in its fresh form (cooked or roasted), as well as canned and processed in the form of tamale, cake, ice cream and several other traditional products, during all periods of the year (Pereira Filho et al, 2003;Mamede et al, 2009).…”

“…Similar to most crops, corn is a nutrient-demanding plant. A balanced mineral nutrition associated with adequate fertilization practices is vital for obtaining not only a high productivity but also an economically viable one (Portela et al, 2016). Nitrogen is one of the most important nutrients for this crop as it removes large amounts of the mineral in the soil to the point of considering the nitrogen dose to be applied in the crop the most important decision in the management of fertilizers (Embrapa, 2015), with the nutrient being absorbed in greater amount by corn (Kappes et al, 2014).…”