Sintomas de deficiência de macro e micronutrientes de plantas de milho híbrido BRS 1010

Abstract

Resumo -As deficiências nutricionais na cultura do milho contribuem significativamente para a queda da produtividade e, consequentemente, do lucro do produtor. Dessa forma, é importante que pesquisas sejam conduzidas no sentido de identificá-las no início do ciclo da planta para que as devidas providências sejam tomadas a tempo de de não prejudicar a colheita. Com base nisso, objetivou-se com esse trabalho identificar a sintomatologia de deficiência dos nutrientes nitrogênio, fósforo, potássio, cálcio, magnésio, enxofre, ferro, boro, manganês, zinco, molibdênio e cobre no milho híbrido BRS 1010. O experimento foi conduzido em casa de vegetação pertencente ao Departamento de Solos e Irrigação do Centro de Ciências Agrárias da Universidade Federal de Roraima, entre 07 de abril e 11 de maio de 2010. O delineamento experimental utilizado foi o inteiramente ao acaso com treze tratamentos e três repetições, perfazendo um total de 39 parcelas experimentais. Cada parcela foi representada por um vaso de Leonard contendo duas plantas. O tratamento 'completo' foi representado pelas plantas que receberam, via solução nutritiva, todos os nutrientes essenciais ao crescimento e desenvolvimento. Os demais tratamentos consistiram de uma subtração de cada nutriente mencionado anteriormente, sendo os demais supridos normalmente. Os sintomas de deficiência de cada macro e micronutrientes foram descritos, tão logo apareciam e durante todo o período de condução do experimento. O método da diagnose por subtração mostrou-se eficiente para avaliar visualmente os sintomas de deficiência nutricional no milho.Palavra chave -Deficiência nutricional. Diagnose por subtração. Diagnose visual. Macronutrientes. Zea mays L.Abstract -The nutritional deficiencies on corn culture contribute significantly to the fall in productivity and, consequently, of the farmer gain. It is important to identify the nutritional deficiencies at the beginning of the plant cycle so that providences can be taken in at time to save the harvest. Thus, this objective of this study was to identify the deficiency symptoms of the nutrients nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, boron, manganese, zinc, molybdenum, and copper in hybrid corn BRS 1010. The experimental design was entirely randomized with thirteen treatments and three repetitions, consisting of a total of thirty nine experimental parcels. Each parcel was represented by a Leonard vase contained two plants. The 'complete' treatment was represented by plants that received, through of nutrition solution, everybody the essential nutrients to growth and development. The other treatments were formed by subtraction of every one of the essential nutrients, with the others supplied normally. The deficiency symptoms of each macro and micronutrients were recorded during all periods of the experiment. The diagnosis method by subtraction showed to be very efficient to visually evaluate the symptoms of nutritional deficiency in corn.

Macronutrients deficiency inHeliconia psittacorumxHeliconia spathocircinata‘Golden Torch’

“…Antagonistic results were observed in other Zingiberales ornamental as Etlingera elatior and Zingiber spectabilis, planted by seed and subjected to nutritional stress, while growth compromised (COELHO et al, 2012;FRAZÃO et al, 2010).…”

“…After this period, were applied the treatments that consisted of ½-strength modified Hoagland solution (HOAGLAND; ARNON, 1950) and the other treatments constituted by the same nutrition solution with lack of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) or sulfur (S) and absence of macronutrients (water). Nutrient solutions were formulated to eliminate particular specified nutrients, without changing other nutrient concentration (FERREIRA, 2012).…”

Macronutrients Omission in the Growth of Cotton, BRS Topázio Cultivar Grown in Nutritious Solution

“…Ferreira [24] studying the maize crop submitted to omission of macronutrients also verified a marked reduction in size when submitted to the omission of nutrients calcium, potassium, nitrogen and phosphorus. Souza et al [13], investigating the omission of nitrogen and potassium in the sesame crop verified a significant reduction of plant height.…”

Swine farm wastewater and mineral fertilization in corn cultivation

“…Leaf analysis of corn subjected to the application of swine farm wastewater (SFW) and mineral fertilization (MF) considered as adequate are within the range of 10 -25 mg kg -1 . Considered as an essential micronutrient, its deficiency can cause plant tillering, sharp decrease in size and bud dormancy breaking (Ferreira, 2012).…”