Symptoms of deficiency and initial growth of maize cultivated with biochar under nutrient omission
DOI:
https://doi.org/10.5433/1679-0359.2022v43n5p2079Palabras clave:
Diagnosis by subtraction, Visual diagnosis, Zea mays.Resumen
Maize is the second largest agricultural crop in Brazil. It reaches high yields as supported by the intensive use of technologies, particularly mineral fertilization, which is normally costly. To lower production costs and improve crop productivity on small farms, the present study tested the efficiency of poultry litter biochar as a source of nutrients in the initial growth of BRS 2022 maize by the ‘diagnosis by subtraction’ method. The study was carried out in a greenhouse, using a completely randomized experimental design with a factorial arrangement (7×3). The following treatments were tested: complete nutrient solution (N, P, K, Ca, Mg, S, B, Cl, Cu, Fe, Mn, and Zn); complete nutrient solutions with omission of only nitrogen (-N), phosphorus (-P), potassium (-K), calcium (-Ca), and magnesium (-Mg); and complete absence of nutrients and three increasing rates of biochar (0, 5, and 10 t ha-1). Absence of nutrients with biochar rates significantly influenced the growth and dry biomass production variables of the maize plants. Except for stem diameter and the ratio between shoot and root dry biomass, all variables were influenced by the interaction between nutrients and biochar rates. Nutrient omission limited maize growth; however, the application of biochar reduced these limitations and significantly improved all analyzed variables. In the treatments without fertilizer, maize growth was very low, with generalized symptoms of deficiency that would decrease with the application of biochar. Even in the treatment with complete fertilization, which showed some slight visual symptoms, these decreased with the application of biochar.Métricas
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