Territory Stories

Technical annual report 2000-01

Details:

Title

Technical annual report 2000-01

Collection

Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295

Date

2001-10

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:2001-10

Language

English

Subject

Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals

Publisher name

Dept. of Primary Industry and Fisheries

Place of publication

Darwin

Series

Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295

ISSN

0158-2763

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/223369

Citation address

https://hdl.handle.net/10070/687151

Page content

Department of Primary Industry and Fisheries 146 adaptability of the tree to certain soils and climates; resistance to diseases. Method: Four cultivars of lemons were budded to seven different rootstocks, but not all combinations were undertaken, resulting in 21 cultivar/stock combinations. Cultivar/ stock combinations were originally replicated four or six times depending on the site. Field layouts have been designed with cultivar/ stock combinations randomly assigned to single tree plots. The four scion cultivars include Eureka, Lisbon, Fino and Verna. The seven rootstocks include Benton Citrange, Cox Mandarin, Lockyer Rough Lemon, Rangpur, Nelspruit hybrid 639, Volkamericiana (Volker) Lemon and Swingle Citrumelo. The trees were to be planted on three different soil types namely Tippera, Blain and River levee. The Tippera site was established in mid1996 and the Blain site was planted in November 1997. However, the River levee site was planted in October 1997 but was severely damaged by the Australia Day 1998 flood and was not replanted. Three cultivars of grapefruit were budded to seven different rootstocks, but not all were undertaken, resulting in 19 cultivar/stock combinations. Cultivar/ stock combinations were originally replicated four or six times depending on the site. Field layouts have been designed with cultivar/ stock combinations randomly assigned to single tree plots. The three scion cultivars include Rio Red, Flame and Star Ruby. The seven rootstocks include Benton Citrange, Cox Mandarin, Cleopatra Mandarin, Carrizo Citrange, Trifoliate Orange (Poncirus trifoliata), Nelspruit hybrid 639, and Swingle Citrumelo. The trial was conducted on two different soil types namely Tippera and Blain. The Tippera site was established in mid-1996 and the Blain site was planted in November 1997. Results and Discussion: In previous years, the trials at both sites were reduced in size. However in 2000 the co-operators removed the remaining trees at both sites as they wished to grow other crops. The trees at both sites had failed to grow sufficiently. There were a number of factors responsible for this but the primary reason was that subsequent to the planting of the trials both co-operators changed their minds about proceeding with commercial plantings of citrus. Before the removal of the trees, their girth circumferences were measured and photos were taken of the graft unions. A report on the trial is being prepared and will be released in the coming year. PROJECT: Evaluation of Navel Oranges, Lemon and Mandarin Cultivars Project Officers: N. Isgro, A. Nesbitt, D. King and I. Broad Location: Alice Springs Region Objective: Evaluate the adaptability of navel, lemon and mandarin cultivars to growing conditions in Central Australia. At present, the supply of navel oranges to domestic markets is very limited between the months of March to June, lemons from December to April and mandarins from January to March. The Queensland citrus industry is the first to supply early navel oranges for domestic consumption to replace imported Californian navel oranges. Demand for lemons and mandarins is also strong with supplies limited and market prices at a premium from December to April. Limited evaluation work on these fruits in the Alice Springs region has indicated that it may be possible to produce high quality, early maturing navel oranges. Additional work is also required to evaluate the potential for the production of high quality lemons and mandarins.