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United States Department of Agriculture

Agricultural Research Service

Research Project: Impact of Climate Change on Plant Defense Responses Induced by Insect Herbivores and Plant Pathogens

Location: Chemistry Research

Title: The Florida citrus soil water atmosphere plant (SWAP) project: review and final summary of yields and tree health

item Allen, Hartwell
item Calbert, D
item Cohen, M
item Pelosi, R
item Rogers, J
item Stewart, E

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2014
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The Florida Citrus Soil Water Atmosphere Plant (SWAP) Project at the UF-IFAS Indian River Research and Education Center had three blocks each of soil tillage (mixing ) treatments of shallow tilled (ST), deep tilled (DT), and deep tilled plus lime (DTL) on a Spodosol (Oldsmar fine sandy loam). Each block had three adjacent submerged subsurface plastic drains and three adjacent open drains. Pineapple orange and Marsh grapefruit scions on six rootstocks were transplanted in November 1970. Yields are reported from 1973-74 to 1984-85 in 12-tree units by scion, rootstock, tillage treatment, and subsurface drain type. By the last harvest, cumulative yields of Pineapple orange were greatest for rootstocks of Rough lemon, Rangpur lime, and Cleopatra mandarin, immediate for Sour orange and Carrizo citrange, and least for Poncirus trifoliata. Ratings of the fifth annual survey of tree health were made in November 1984. Major trends were: (i) the number of healthy trees continued to decrease; (ii) the number of trees with citrus blight symptoms continued to increase, especially on Rough lemon rootstock; (iii) trees on the Cleopatra mandarin rootstock continued to be the healthiest; and (iv) Carrizo citrange and Poncirus trifoliata rootstocks showed the most chronic and recent water damage.

Last Modified: 10/17/2017
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