Recuperação e distribuição do nitrogênio fornecido a videiras jovens

Abstract

Resumo -O objetivo deste trabalho foi estimar a recuperação e a distribuição do N fornecido a videiras jovens. O experimento foi realizado em casa de vegetação na Embrapa Uva e Vinho, Bento Gonçalves, RS. Foram utilizadas videiras da cultivar Riesling Itálico e Chardonnay, enxertadas no porta-enxerto 101-14 Mgt. Foi cultivada uma planta por vaso contendo 3,5 kg de um Neossolo Litólico. A solução de sulfato de amônio com 2% de átomos 15 N, na dose de 185,60 mg de N foi aplicada na superfície do solo depois do transplante das videiras. As plantas foram coletadas em seis épocas, e separadas em folhas, porta-enxerto + enxerto, raízes grossas e finas. Todas as partes das videiras foram secadas em estufa, para determinação da produção de matéria seca e análise do N total e 15 N. A maior recuperação do N do fertilizante pelas videiras jovens ocorreu em épocas próximas ao fornecimento do N. A maior quantidade de N acumulado nas videiras derivou-se de formas diferentes daquelas do N fornecido. As folhas e raízes foram o maior compartimento de N total e N derivado do fertilizante.Termos para indexação: Vitis vinifera, adubação nitrogenada, redistribuição de N, acumulação de N, 15 N. Recovery and distribution of supplied nitrogen to young grapevinesAbstract -The objective of this work was to estimate the recovery and the distribution of N supplied to young grapevines. The experiment was carried out in greenhouse at Embrapa Uva e Vinho, Bento Gonçalves, RS, Southern Brazil. Cultivars used were Riesling Itálico and Chardonnay grafted on rootstock 101-14 Mgt. One plant was cultivated in each vase containing 3.5 kg of Udorthent soil. The solution of ammonium sulphate with 2% atoms 15 N, at the rate of 185.60 mg N, was applied on the soil surface after the transplantation of the grapevines. Plants were collected six times, during vegetative growth, and fractionated in leaves, rootstock + scion, thick roots and fine roots, and then oven-dried, weighted, and analyzed for total N and 15 N contents. The largest N recovery of the fertilizer for the young grapevines ocurred in times near to the N supplying. The largest amount of N accumulated in the grapevines was derived from different forms of the N supplied. Leaves and roots were the largest compartment of total N and N fertilizer.

Grape yield, and must compounds of 'Cabernet Sauvignon' grapevine in sandy soil with potassium contents increasing

“…Thus, higher K supply, absorption and accumulation in plants are expected, especially in accumulation organs during the summer period, such as leaves that are in intensive cell division, becoming nutrient drainers (TAGLIAVINI & SCANDELLARI et al, 2013). Thus, the absorbed nutrient supplies the physiological needs and forms reserves in the plant (BRUNETTO et al, 2006). However, total K content in the leaves has not varied between vineyards during berries color changing.…”

“…However, total K content in the leaves has not varied between vineyards during berries color changing. Vine nutrient content diagnosis is not always correct by the analysis of leaves collected during berries color changing (TAGLIAVINI& SCANDELLARI et al, 2013), such as K in vines, because the nutrient in ionic form can be redistributed from leaves to other organs in growth, such as bunches, or in lower amounts to other nutrient reserve organs, such as roots or branches that are more than one year old (BRUNETTO et al, 2006).…”

Leaf water potential, nutritional status and must composition in grapes 'Pinot Nero' with and without irrigation

“…N Ca P Mg K Weight 100 berries TSS pH Total titratable acidity N in the soil, especially N-NO 3 -, which forms an outer sphere complex with the reactive particles in the soil. Thus, the N availability is reduced and, consequently, the amount absorbed and accumulated in grapevine organs decreases, including in the berries (BRUNETTO et al, 2006).…”

Produção e composição química da uva de videiras Cabernet Sauvignon submetidas à adubação nitrogenada

“…Eles, em geral, estão localizados em solos com médio ou baixo teor de matéria orgânica, mas com intenso crescimento de espécies que co-habitam os vinhedos (BRUNETTO, 2004;BRUNETTO et al, 2006a;BRUNETTO et al, 2006b;BRUNETTO, 2008a). Com isso, há deposição de resíduos orgânicos na superfície do solo durante o ano todo, cuja condição climática-ambiental e a composição bioquímica determinam as taxas de mineralização que controlam a ciclagem de nutrientes nesse sistema (TRINSOUTROT et al, 2000;AGEHARA & WARNCKE, 2005).…”