Marcha de absorção de macronutrientes e de micronutrientes em mudas de goiabeira Paluma e Século XXI
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Data
2006-12-06
Autores
Franco, Claudenir Facincani [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo do presente estudo foi determinar a curva de crescimento e a marcha de absorção de nutrientes em mudas de duas cultivares de goiabeira obtidas por estaca herbácea. O delineamento experimental utilizado foi em parcelas subdivididas com três repetições. Assim, foram utilizadas como tratamentos principais duas cultivares de goiabeira (Paluma e Século XXI) e, como subtratamentos, sete coletas de plantas, ao longo do período experimental (120 dias) em solução nutritiva. As plantas foram avaliadas quinzenalmente quanto a: altura, número de folhas, diâmetro do caule, área foliar, massa seca (folhas, caule e raízes). Nos diferentes órgãos das mudas, determinou-se o acúmulo de nutrientes. O acúmulo de massa seca das mudas em função do tempo ajustou-se a um modelo quadrático, enquanto que altura, diâmetro de caule, número de folhas e área foliar ajustaram se a um modelo linear. A muda de goiabeira da cultivar Século XXI tem maior exigência de nutrientes que a da cultivar Paluma, e o período de maior exigência é a partir dos 75 e 45 dias, para Paluma e Século XXI, respectivamente. O acúmulo médio de macronutrientes pelas mudas de goiabeira das cultivares Paluma e Século XXI foi de: K (726 e 696), N (552 e 585), Ca (293 e 302), S (73 e 66), P (64 e 66) e Mg (39 e 41) mg por planta, respectivamente. O acúmulo médio de micronutrientes pelas mudas de goiabeira obedeceu à seguinte seqüência: Fe>Mn>Zn>B>Cu, sendo maior nas folhas para B, Cu, Mn e Zn, e nas raízes para Fe. O acúmulo de micronutrientes para as cultivares Paluma e Século XXI em g por planta foi de: B (632 e 783), Cu (134 e 158), Fe (8103 e 5534), Mn (3052 e 3709) e Zn (760 e 997), respectivamente.
This study was carried out to evaluate the vegetative growth and nutrient uptake in guava trees obtained by herbaceous cutting from two cultivars. The experimental design was arranged in split-plots with three replications. The two guava cultivars (Paluma and Século XXI) were used as plots, and the seven samplings performed during a 120-day period in nutritive solution corresponded to split-plots. Plant height, number of leaves, stem diameter, leaf area and dry mass (leaves, stem and roots) were determined every 15 days. The accumulation of macro and micronutrients was measured in the different plant organs. The dry mass accumulation of guava trees in function of time adjusted a quadratic model, while, height, stem diameter, number of leaves and leaf area adjust a linear model. Guava trees from the cultivar Século XXI have shown higher macro and micronutrient needs in comparison to Paluma , and the period of highest demand is after 75 and 45 days for Paluma and Século XXI, respectively. The medium accumulation of macronutrients in guava trees from the cultivars Paluma and Século XXI , in mg per plant, was (respectively): K: 726 and 696; N: 552 and 585; Ca: 293 and 302; S: 73 and 66; P: 64 and 66; and Mg: 39 and 41. The mean accumulation of micronutrients followed the order: Fe>Mn>Zn>B>Cu. This accumulation was higher in leaves for B, Cu, Mn and Zn, and higher in roots for Fe. Nutrient accumulation for the cultivars Paluma and Século XXI , in g per plant, was (respectively): B: 632 and 783; Cu: 134 and 158; Fe: 8103 and 5534; Mn: 3052 and 3709; and Zn 760 and 997.
This study was carried out to evaluate the vegetative growth and nutrient uptake in guava trees obtained by herbaceous cutting from two cultivars. The experimental design was arranged in split-plots with three replications. The two guava cultivars (Paluma and Século XXI) were used as plots, and the seven samplings performed during a 120-day period in nutritive solution corresponded to split-plots. Plant height, number of leaves, stem diameter, leaf area and dry mass (leaves, stem and roots) were determined every 15 days. The accumulation of macro and micronutrients was measured in the different plant organs. The dry mass accumulation of guava trees in function of time adjusted a quadratic model, while, height, stem diameter, number of leaves and leaf area adjust a linear model. Guava trees from the cultivar Século XXI have shown higher macro and micronutrient needs in comparison to Paluma , and the period of highest demand is after 75 and 45 days for Paluma and Século XXI, respectively. The medium accumulation of macronutrients in guava trees from the cultivars Paluma and Século XXI , in mg per plant, was (respectively): K: 726 and 696; N: 552 and 585; Ca: 293 and 302; S: 73 and 66; P: 64 and 66; and Mg: 39 and 41. The mean accumulation of micronutrients followed the order: Fe>Mn>Zn>B>Cu. This accumulation was higher in leaves for B, Cu, Mn and Zn, and higher in roots for Fe. Nutrient accumulation for the cultivars Paluma and Século XXI , in g per plant, was (respectively): B: 632 and 783; Cu: 134 and 158; Fe: 8103 and 5534; Mn: 3052 and 3709; and Zn 760 and 997.
Descrição
Palavras-chave
Elementos traços na nutrição, Goiaba - Mudas, Plantas - Nutrição, Macronutrientes, Nutrient accumulation
Como citar
FRANCO, Claudenir Facincani. Marcha de absorção de macronutrientes e de micronutrientes em mudas de goiabeira Paluma e Século XXI. 2006. x, 71 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2006.