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Agriculture 2018, 8(3), 38;

Harvesting Method Affects Water Dynamics and Yield of Sweet Orange with Huanglongbing

Southwest Florida Research and Education Center, University of Florida, 2685 SR 29 N, Immokalee, FL 34142, USA
Author to whom correspondence should be addressed.
Received: 8 February 2018 / Revised: 1 March 2018 / Accepted: 8 March 2018 / Published: 10 March 2018
(This article belongs to the Special Issue Modelling for Water Management in Agriculture Systems)
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Changes in grove management practices may change crop water dynamics. The objective of this study was to estimate sap flow, stem water potential (Ψstem), and citrus yield as affected by harvesting methods in sweet orange (Citrus sinensis) trees affected by Huanglongbing. The study was initiated in March 2015 for two years on five-year-old commercial sweet orange trees at a commercial grove located at Felda, Florida (26.61° N, 81.48° W) on Felda fine sand soil (Loamy, siliceous, superactive, hyperthermic Arenic Endoaqualfs). All measurements were replicated before and after harvest in four experiments (A, B, C and D) under hand and mechanical harvesting treatments. Sap flow measurements were taken on four trees per treatment with two sensors per tree. Sap flow measured by the heat balance method at hourly intervals during March and April of 2015 and 2016 significantly declined after harvesting by 25% and 35% after hand and mechanical harvesting, respectively. Ψstem measured after harvest was significantly higher than measurements before harvest. The average value of Ψstem measured increased by 10% and 6% after hand and mechanical harvesting, respectively. Mechanical harvesting exhibited lower fruit yields that averaged between 83%, 63%, 49% and 36% of hand-harvested trees under A, B, C and D experiments, respectively. It is concluded that the hand harvesting method is less stressful and less impactful on tree water uptake and fruit yield compared with mechanical harvesting. View Full-Text
Keywords: stem water potential; sap flow; fruit yield; mechanical harvesting; hand harvesting stem water potential; sap flow; fruit yield; mechanical harvesting; hand harvesting

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Hamido, S.A.; Morgan, K.T. Harvesting Method Affects Water Dynamics and Yield of Sweet Orange with Huanglongbing. Agriculture 2018, 8, 38.

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