Teores foliares de nutrientes em plantas de camucamuzeiro (Myrciaria dubia (H.B.K.) McVaugh) submetidas a adubações orgânica, mineral e foliar

Abstract

Teores foliares de nutrientes em plantas de camucamuzeiro (Myrciaria dubia (H.B.K.) McVaugh) submetidas a adubações orgânica, mineral e foliar RESUMOO objetivo neste estudo foi avaliar a resposta das plantas de camu-camu (Myrciaria dubia (H.B.K.) McVaugh) por meio dos teores foliares de macro (Ca, Mg, P, K e N) e micronutrientes (Fe, Mn e Zn), em um experimento conduzido na Comunidade do Brasileirinho, localizada na periferia do município de Manaus-AM. O delineamento utilizado foi em blocos casualizados, em esquema fatorial de parcela subdividida 3 x 10 (três épocas de coleta e dez tratamentos, com três repetições). Os tratamentos foram constituídos por adubação orgânica (1L de esterco de galinha), adubação mineral, combinação de adubação mineral e foliar e somente adubação foliar. A adubação orgânica resultou em maiores teores e Ca, Mg e K nas folhas dos camucamuzeiros e as plantas que receberam adubação foliar apresentaram os maiores teores de Fe, Zn e P. Palavras-chave:Fertilização foliar, frutífera nativa, região amazônica.

Nutrient contents and fertirrigation in camu camu (Myrciaria dubia (Kunth) McVaugh) crop with different nitrogen doses

“…The leaf contents of Mn, cited in this study are higher than those reported by Esashika et al (2011), who worked with Organic, mineral and foliar fertilization in camu-camu plants (131 mg.kg -1 of Mn), but verified values are within those suitable for plant nutrition accordingly to Dechen & Nachtigall (2006), who consider an adequate concentrations between 20 and 500 mg.kg -1 . However, Mn levels linked to plant toxicity, are observed in plants established in lowland soils under flooding and an inadequate irrigation, since the availability of Mn 2+ is favored under these conditions (Dechen & Nachtigall, 2006).…”

“…As a result, it has long been thought that these leaf content of K was higher than those reported by Viégas et al (2004), who showed levels between 5.2 a 6.0 g.kg -1 and also to those observed by Esashika et al (2011), who worked with mineral fertilizer (6.05 g.kg -1 of K). Nevertheless, the result of Ca is within those suitable for camu-camu plants, since the ideal range for foliar contents of this nutrient is from 7.1 g.kg -1 (Viégas et al, 2004) to 11.7 g.kg -1 (Esashika et al, 2011).…”

“…Accordingly to Viégas et al (2004), the foliar contents suitable for Mg are between 1.4 and 3.6 g.kg -1 . A possible explanation for this, is the value found in this research, which met the adequate quantities demanded by camu-camu plants, being still higher than those found by Esashika et al (2011).…”

“…However, Mn levels linked to plant toxicity, are observed in plants established in lowland soils under flooding and an inadequate irrigation, since the availability of Mn 2+ is favored under these conditions (Dechen & Nachtigall, 2006). Conversely, Fe content was also higher than those found by Esashika et al, (2011), when registering 66 mg.kg -1 of Fe in camu-camu plants with mineral fertilization. Fe contents found in this study, are suitable for plant development, once Dechen & Nachtigall (2006), mention that Fe deficiency in plants, present leaf concentrations lower than 10 mg.kg -1 .…”

“…Nevertheless, the result of Ca is within those suitable for camu-camu plants, since the ideal range for foliar contents of this nutrient is from 7.1 g.kg -1 (Viégas et al, 2004) to 11.7 g.kg -1 (Esashika et al, 2011).…”