| Registro completo |
| Provedor de dados: |
Rev. Bras. Frutic.
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| País: |
Brazil
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| Título: |
Addition of nitrogen had no effect on yield and quality of apples in an high density orchard carrying a dwarf rootstock
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| Autores: |
Ernani,Paulo Roberto
Rogeri,Douglas Antônio
Proença,Marcelo Machado
Dias,Jaques
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| Data: |
2008-12-01
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| Ano: |
2008
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| Palavras-chave: |
Apple yield
M.9 rootstock
Fruit quality
Nitrogen
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| 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452008000400044
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| Editor: |
Sociedade Brasileira de Fruticultura
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| Relação: |
10.1590/S0100-29452008000400044
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Fruticultura v.30 n.4 2008
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| Direitos: |
info:eu-repo/semantics/openAccess
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