Curva de crescimento e marcha de absorção de macronutrientes em mudas de goiabeira
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Data
2007-12-01
Autores
Franco, Claudenir Facincani [UNESP]
Prado, Renato de Mello [UNESP]
Brachirolli, Luiz Fernando [UNESP]
Rozane, Danilo Eduardo [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Ciência do Solo
Resumo
A utilização de mudas de goiabeira com adequado estado nutricional determina o sucesso da implantação de um pomar. O objetivo deste trabalho foi determinar crescimento e acúmulo de macronutrientes em mudas de duas cultivares de goiabeira obtidas por estaquia herbácea. O delineamento utilizado foi o inteiramente casualizado, com parcelas subdivididas, com três repetições. Assim, foram utilizadas como parcelas duas cultivares de goiabeira (Paluma e Século XXI) e, como subparcelas, 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 e massa de matéria seca (folhas, caule e raízes). Nos diferentes órgãos das mudas, determinou-se o acúmulo de macronutrientes. Houve acúmulo quadrático de matéria seca das mudas de goiabeira com o tempo de cultivo. A muda de goiabeira da cultivar Século XXI tem maior exigência de macronutrientes que a da cultivar Paluma, e o período de maior exigência é a partir dos 75 e 45 dias, para ambas as cultivares. O acúmulo 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.
The use of guava seedlings with adequate nutritional status determines the success of an orchard installation. This study was conducted to determine plant growth and macronutrient accumulation in herbaceous seedlings of two guava cultivars. The experiment was arranged in a completely randomized design in split-plots with three replications. Plots consisted of the two guava cultivars (Paluma and Século XXI) in nutrient solution and the sub-plots were the seven sampling dates in a 120 day period. Plant height, number of leaves, stem diameter, leaf area and dry mass (leaves, stem and roots) were determined biweekly. The accumulation of macronutrients was determined in the different plant organs. A quadratic dry mass accumulation was observed with plant age. The macronutrient requirement of cultivar Século XXI was higher than that of Paluma, and the period of highest demand is after 75 and 45 days, respectively. The accumulation of macronutrients (mg/plant) in the cultivars Paluma and Século XXI 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 use of guava seedlings with adequate nutritional status determines the success of an orchard installation. This study was conducted to determine plant growth and macronutrient accumulation in herbaceous seedlings of two guava cultivars. The experiment was arranged in a completely randomized design in split-plots with three replications. Plots consisted of the two guava cultivars (Paluma and Século XXI) in nutrient solution and the sub-plots were the seven sampling dates in a 120 day period. Plant height, number of leaves, stem diameter, leaf area and dry mass (leaves, stem and roots) were determined biweekly. The accumulation of macronutrients was determined in the different plant organs. A quadratic dry mass accumulation was observed with plant age. The macronutrient requirement of cultivar Século XXI was higher than that of Paluma, and the period of highest demand is after 75 and 45 days, respectively. The accumulation of macronutrients (mg/plant) in the cultivars Paluma and Século XXI 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.
Descrição
Palavras-chave
nutrição mineral, acúmulo de nutrientes, exigência nutricional, macroelementos, Psidium guajava, mineral nutrition, nutrient acumulation, nutritional requirements, macronutrients, Psidium guajava
Como citar
Revista Brasileira de Ciência do Solo. Sociedade Brasileira de Ciência do Solo, v. 31, n. 6, p. 1429-1437, 2007.