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Revista Brasileira de Fruticultura

versão impressa ISSN 0100-2945versão On-line ISSN 1806-9967

Resumo

ESPOSTI, Marlon Dutra Degli  e  SIQUEIRA, Dalmo Lopes de. Nitrogen fertilization on growth of citrus rootstocks produced in containers. Rev. Bras. Frutic. [online]. 2004, vol.26, n.1, pp.136-139. ISSN 0100-2945.  http://dx.doi.org/10.1590/S0100-29452004000100037.

The objective of this study was to determinate urea dose to be applied on citrus rootstocks, and evaluation of the rootstock growths in containers. The factorial scheme (2x5) + (2x5) in a experimental design of randomized blocks was used with three replications, to evaluate four rootstocks, and five urea doses varying from 0 to 772 mg dm-3 in substrate. The following characteristics were evaluated: leaves number, leaf area, weight of the leaf fresh and dry matter, stem weight, and roots weights. Some differences occurred among the studied rootstock species in relation to the appraised growth characteristics. The rootstocks 'Cravo' and 'Volkameriano' showed the largest heights and stem diameters, reaching first the grafting point, therefore were considered more vigorous than both mandarin trees in this cropping system. The rootstocks 'Cravo' and 'Volkameriano' demanded less amount of N than the mandarin trees, since the N doses (mg dm-3 substrate) providing the highest height were 453 to lemon trees ' Cravo', 431 to ' Volkameriano', 624 to mandarin tree ' Cleópatra', and 610 to mandarin tree' Sunki'. The largest diameter was reached with doses of 455, 433, 543 and 546 to the lemon trees ' Cravo' and ' Volkameriano' and the mandarin plants ' Cleópatra' and ' Sunki'.

Palavras-chave : fertilization; urea; recipients; Citrus; production of Citrus seedling.

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