Sweet orange trees grafted on selected rootstocks fertilized with nitrogen, phosphorus and potassium

Pesquisa Agropecuária Brasileira

José Antônio Quaggio²  Dirceu Mattos Junior¹  Heitor Cantarella²  Eduardo Sanches Stuchi¹  Otávio Ricardo Sempionato¹ 

[1] ,Instituto Agronômico Centro de P& D de Solos e Recursos Ambientais Campinas SP

关键词: citrus;    growth;    yields;    canopy;    citro;    crescimento;    produtividade;    cobertura de copas;   

DOI  :  10.1590/S0100-204X2004000100008

来源: SciELO

【 摘 要 】

The majority of citrus trees in Brazil are grafted on 'Rangpur lime' (Citrus limonia Osb.) rootstock. Despite its good horticultural performance, search for disease tolerant rootstock varieties to improve yield and longevity of citrus groves has increased. The objective of this work was to evaluate yield efficiency of sweet oranges on different rootstocks fertilized with N, P, and potassium. Tree growth was affected by rootstock varieties; trees on 'Swingle' citrumelo [Poncirus trifoliata (L.) Raf. × C. paradisi Macf.] presented the smallest canopy (13.3 m³ in the fifth year after tree planting) compared to those on 'Rangpur lime' and 'Cleopatra' mandarin [C. reshni (Hayata) hort. ex Tanaka] grown on the same grove. Although it was observed an overall positive relationship between canopy volume and fruit yield (R² = 0.95**), yield efficiency (kg m-3) was affected by rootstocks, which demonstrated 'Rangpur lime' superiority in relation to Cleopatra. Growth of citrus trees younger than 5-yr-old might be improved by K fertilization rates greater than currently recommended in Brazil, in soils with low K and subjected to nutrient leaching losses.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License