EFFECT OF POULTRY LITTER BIOCHAR ON THE NUTRITIONAL STATUS OF CORN1

• Published in: Caatinga 2021-12, Vol.34 (4), p.916-925
• Main Authors: MENDES, JACQUELINE DA SILVA, FERNANDES, JOSELY DANTAS, CHAVES, LÚCIA HELENA GARÓFALO, TITO, GILVANISE ALVES, GUERRA, HUGO ORLANDO CARVALLO
• Format: Article
• Language: eng ; por
• Subjects: AGRICULTURE, DAIRY & ANIMAL SCIENCE; AGRONOMY; FISHERIES; FOOD SCIENCE & TECHNOLOGY; FORESTRY; VETERINARY SCIENCES
• ISSN: 0100-316X; 1983-2125; 1983-2125
• DOI: 10.1590/1983-21252021v34n419rc

ABSTRACT Corn, one of the main grain crops in Brazil, needs to have its nutritional requirements fully satisfied to achieve high biological productivity. Thus, the objective of this work was to evaluate the influence of increasing doses of poultry litter biochar on nutrient concentrations in the leaves of hybrid corn BRS 2022 and in the soil after harvest. The experiment was carried out in a completely randomized design, with four replicates, evaluating six doses of biochar (0; 2.02; 4.05; 6.07; 8.10 and 10.12 t ha-1) and the plots composed of one plant per pot with a volume of 20 dm3. The collection of leaves for leaf diagnosis was carried out at the time of flowering, removing the opposite leaf from the ear base in the middle third region. These leaves were dried in a forced air circulation oven, 65 °C, for a period of 48 hours, ground, sieved through 20 mesh and analyzed for the concentrations of macronutrients in the leaf tissue. At the end of the experiment, 83 days after corn sowing, soil samples were collected as a function of the treatments and then analyzed chemically. Biochar application promoted an increase in the leaf contents of N, P and K, resulting in improvements in the nutritional status of plants for these nutrients. The chemical characteristics of the soil, analyzed after the corn harvest, revealed that there was an influence of the doses of biochar on the levels of calcium, organic carbon, potassium and phosphorus. RESUMO O milho, uma das principais culturas de grãos do Brasil, necessita ter as suas exigências nutricionais plenamente satisfeitas para atingir elevadas produtividades biológicos. Dessa forma, objetivou-se com esse trabalho avaliar a influência de doses crescentes de biocarvão de cama de aviário nas concentrações dos nutrientes nas folhas do milho híbrido BRS 2022 e no solo após a colheita. O experimento foi conduzido em delineamento inteiramente casualizado, com quatro repetições, sendo seis doses de biocarvão (0; 2,02; 4,05; 6,07; 8,10 e 10,12 t ha-1) e as parcelas constituídas por uma planta por vaso com volume de 20 dm3. A coleta de folhas para diagnose foliar foi realizada na época do florescimento, sendo retirada a folha oposta e da base da espiga na região do terço médio. Essas folhas foram secas em estufa de circulação forçada de ar a 65 °C por um período de 48 horas, moídas, peneiradas em 20 mesh e analisadas em relação a concentração dos macronutrientes no tecido foliar. No final do experimento, 83 dias após a sem