SciELO - Scientific Electronic Library Online

 
vol.38 número4Variabilidade espacial de Planossolo e produtividade de soja em várzea sistematizada: análise geoestatística e análise de regressãoRamos colaterais parietais e terminais da aorta abdominal em Myocastor coypus (nutria) índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Ciência Rural

versão impressa ISSN 0103-8478

Resumo

SKREBSKY, Etiane Caldeira et al. Characterization of the nutritional demands of young plants of Pfaffia glomerata in a Paleudalf soil by means of the missing nutrient technique. Cienc. Rural [online]. 2008, vol.38, n.4, pp. 989-996. ISSN 0103-8478.  http://dx.doi.org/10.1590/S0103-84782008000400013.

This study aimed to characterize the nutritional demands of the young plants of Brazilian ginseng (Pfaffia glomerata (Spreng.) Pedersen) in a Paleudalf soil by means of the missing nutrient technique. Plantlets of P. glomerata produced in vitro and acclimatized ex vitro were used as start matter for the glasshouse experiment. Ten days after plant transfer to soil, fertilizations (by means of nutritive solutions) were done corresponding to nine treatments: control (without fertilization), complete fertilization (with macro and micronutrients), and with the omissions of N, P, K, Ca, Mg, S and micronutrients (Zn, B, Cu, Fe, Mn and Mo). At 60 days of cultivation, several growth parameters were evaluated. The number of leaves per plant was the growth parameter most affected by omission of N, K, S and P in the fertilization. The effect of nutrient omission in the fertilization on biomass partitioning between plant organs were differentiated. Accumulated shoot biomass obeied the following decreasing order, in relation with the nutrient omission: Mg @ micronutrients > Ca @ complete fertilization > P > S > K > N @ control. While the root biomass obeied the following decreasing order: Mg @ complete fertilization ³ P ³ micronutrients ³ S ³ Ca > N > K @ control. Young plants of P. glomerata grow in a Paleudalf soil showed greater reduction in growth by omission of N, K, S and P in the fertilization. The omission of Mg and micronutrients in the fertilization were not limiting to the growth of young plants.

Palavras-chave : Brazilian ginseng; mineral nutrition; nutrient subtraction; mineral fertilization; Amaranthaceae.

        · resumo em Português     · texto em Português     · pdf em Português