Revista Brasileira de Fruticultura
Print version ISSN 0100-2945
BOTELHO, Renato Vasconcelos; MULLER, Marcelo Marques Lopes; BASSO, Clori and SUZUKI, Atsuo. Leaf content and nutrient extraction by fruit harvest of pear trees cultivars grafted on quince 'CP'. Rev. Bras. Frutic. [online]. 2010, vol.32, n.3, pp.884-891. Epub Sep 08, 2010. ISSN 0100-2945. http://dx.doi.org/10.1590/S0100-29452010005000087.
The fertilizer applications in deciduous fruit trees are usually recommended in function of chemical soil and leaves analysis interpretation, but they are not specific for the different scion and rootstock cultivars. In this context, a trial was carried out aiming to evaluate the nutritional status of different pear cultivars grafted on rootstock quince 'CP' by two consecutive years, in Guarapuava, Paraná State, Brazil. The pear cultivars Cascatense, Tenra, Hosui, Packham's Triumph and Williams were planted in 2004 at the density planting of 2.500 plants ha-1. Samples of leaves and fruits were collected in 2006 and 2007 for chemical analysis of nutrient contents. Complete and normal leaves were sampled in the end of January, token from the middle part of one-year shoots. The fruits were collected when the total soluble solids content reached 10º Brix. The pear cultivars showed differences in relation to nutrient content in leaves and fruits, indicating distinct nutritional requirements. The cv. Cascatense presented the highest N and P contents in fruits at least in one of the years, and the cv Hosui the highest K content. The nutrient extraction by fruits ranged from 0.366 to 0.825 kg N; 0.097 to 0.205 kg P, 0.996 to 1.302 kg K, 0.049 to 0.085 kg Ca and 0.041 to 0.095 kg Mg per fruit ton.
Keywords : Pyrus spp.; Cydonia oblonga; fruit analysis; leaf analysis; nutrition; rootstock.