Data/hora: 11/06/2024 01:18:26

Provedor de dados: | Revista Brasileira de Fruticultura
País: | Brazil
Título: | Addition of nitrogen had no effect on yield and quality of apples in an high density orchard carrying a dwarf rootstock
Autores: | Ernani,Paulo Roberto; Rogeri,Douglas Antônio; Proença,Marcelo Machado; Dias,Jaques.
Data: | 2008-12-01
Ano: | 2008
Palavras-chave: | Apple yield; M.9 rootstock; Fruit quality; Nitrogen.
Resumo: | The effect of N addition on apple yield and quality may vary according to the tree vigor. Apple trees developed over vigorous rootstocks had shown no response to N application in Brazil. In this study it was evaluated the effect of N addition to the soil on yield and quality of ´Royal Gala´ apples grafted on a dwarf rootstock (M.9). The orchard was planted in 1995 (2,857 trees ha-1) on an Oxisol containing 40 g kg-1 of organic matter and pH 6.0. The experiment was carried out from 1998 up to 2005. Treatments consisted of rates of N (0, 50, 100 and 150 kg ha-1 year-1 from 1998 to 2001, and respectively 0, 100, 200 and 300 kg ha-1 afterwards), all broadcasted within the tree row in two equal splits, at bud break and after harvest, as ammonium sulfate. Addition of N to the soil had no effect on fruit yield over the six years regardless of the applied rate. Averaged across treatments and years, fruit yield was 52.3 t ha-1. Nitrogen in the leaves (average of 24 g kg-1) or in the fruits (average of 346 mg kg-1) as well as some attributes related to fruit quality (color, firmness, acidity, soluble solids, physiological disorders) were unaffected by N addition. Some plant parameters related to tree vigor, however, grew higher with the increase on N rate. Thus, it is not necessary to apply N to deep Brazilian soils containing high organic matter in order to assure good fruit quality and yield on high-density orchards carrying dwarf rootstocks probably because the N required for tree growth and fruit production is supplied from soil organic matter decay.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452008000400044
Editor: | Sociedade Brasileira de Fruticultura
Relação: | 10.1590/S0100-29452008000400044
Formato: | text/html
Fonte: | Revista Brasileira de Fruticultura  v.30 n.4 2008
Fonte: | info:eu-repo/semantics/openAccess