Data/hora: 04/06/2024 06:29:18

Provedor de dados: 	118	
País: 	Chile	
Título: 	Distribution and recycling of canopy nitrogen storage reserves in sweet cherry (Prunus avium) fruiting branches following 15N-urea foliar applications after harvest	
Autores: 	Ayala,Marlene; Bañados,Pilar; Thielemann,Mariana; Toro,Román.	
Data: 	2014-04-01	
Ano: 	2014	
Palavras-chave: 	Bark; Buds; Canopy; Leaves; N use efficiency; Fruit; Stored N; Spur; Sweet cherry wood.	
Resumo: 	In sweet cherries, accumulated nitrogen (N) stores from the previous fall support early spring growth. To complement the N supply in the soil, Chilean growers use foliar urea applications after harvest. Information on the effectiveness of foliar N applications in sweet cherry is lacking. To study the canopy distribution of N applied as urea foliar sprays, an experiment using a "Bing"/"Gisela®6" ("GI®6") sweet cherry orchard was carried out in 2009/2010 in Chile (35° 09' 53'' S, 71° 20' 43'' W). The objective was to investigate N distribution and recycling in 3-year-old fruiting branches. A total of 120 branches (one per tree) were labeled using 15N-urea. 15N-urea was applied to the whole branch on four separate dates or treatments (TR) after fruit harvest: TR1=Jan, TR2=Feb, TR3=Mar and TR4=Apr. For each TR, a group of 15N-labeled branches (10 replications) was destructively harvested at 3 times/stages: 15 days after the urea foliar application (DAA), dormancy and stage I of fruit development. Branches were divided into the various organs, dried (70 °C), ground and processed for GC-MS analysis. In all TR, labeled urea was taken up by the leaves and translocated to various organs. The highest N levels were observed in the fruiting section. TR1 exhibited the highest N use efficiency (NUE%). Buds and bark showed the highest N derived from fertilizer (NDDF%) values. In all TR, stored N was recovered in the flowers, immature fruits and young leaves during the following spring. According to the results, urea sprays after fruit harvest constitute an alternative to complementing the N supply in the soil in sweet cherry trees using "GI®6".	
Tipo: 	Journal article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100007	
Editor: 	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal	
Formato: 	text/html	
Fonte: 	Ciencia e investigación agraria  v.41 n.1 2014