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| University of California Cooperative Extension, Tulare County 2000 | ||
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High density walnut plantings produce positive results
Long-term evaluation of several varieties of walnuts planted in a tight,
hedgerow configuration has been underway in Tulare County for many years.
Hedgerow walnut culture is becoming increasingly popular due to its early,
high production potential and the ability to mechanize previously expensive
hand pruning. When configured into a "hedgerow," the walnut grower makes
a fundamental decision that the "row" not the "tree"
is the orchard's producing unit. Practices such as pruning are designed
to maximize row productivity; individual trees within the row are not
managed separately. Studies were conducted in Tulare, Yolo and Stanislaus counties. The oldest
is in the Visalia area, planted in 1982 and finalized ten years later.
The trees had completed their tenth year of growth following field grafting
and 1992 marked the seventh year of field data collection. The new Tulare variety proved to be the highest yielding, slightly ahead
of Chico's 1992 yield and leader in the cumulative yield data (1986-1992).
Chandler was significantly lower yielding, although it exceeded two tons
per acre. More importantly, the cumulative yield over the seven years from the Chandler variety was only about three-quarters of that obtained from Tulare. These results from the Visalia trial caused some concern as to the suitability of Chandler for hedgerow planting.
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University of California Cooperative Extension - Tulare County
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Revised: May 8, 2002