Navigation Links
Winter drought stress can delay flowering, prevent fruit loss in orange crops
Date:9/20/2010

LAKE ALFRED, FLSuccessful mechanical harvesting of perennial fruit crops requires efficient, economical harvesting systems that do not reduce trees' production life or diminish fruit quality. Most of the world's citrus is now harvested manually, but the use of efficient and lower-cost mechanical harvesting techniques is expected to increase in the next few years, especially in the large citrus plantations in Florida and Brazil. The citrus industry is ramping up efforts to extend the harvest season past June, when the following year's crop becomes large enough to be susceptible to mechanical harvesting; discovering techniques that improve late-season harvesting will give growers better tools to minimize damaging impacts on the next year's fruit yield.

Researchers from the University of Florida's Citrus Research and Education Center published a study in a recent issue of HortScience that determined if winter drought stress could successfully delay flowering and fruit development of immature 'Valencia' sweet oranges to avoid young fruit loss during late-season mechanical harvesting.

The researchers hypothesized that if the Florida 'Valencia' bloom period could be delayed by a few weeks using winter drought stresswithout negative effects on the quality of the current season's cropthe "fruitlets" from delayed flowering would be too small to be affected by mechanical harvesting late in the current harvest season, thus safely extending the mechanical harvesting period.

The study was designed by Juan Carlos Melgar, Jill M. Dunlop, L. Gene Albrigo, and James P. Syvertsen and conducted at the Citrus Research and Education Center in Lake Alfred. Beginning in December 2006 and continuing for three consecutive seasons, Tyvek water-resistive barrier material was used as a rain shield groundcover under 13-year-old-trees. The researchers applied three treatments: drought (no irrigation and covered soil), rain only (no irrigation, no cover), and normal irrigation (rain and no cover). Covers were removed in February or March and normal irrigation and fertilization were resumed.

The drought stress did not affect fruit yield, size, percentage juice, or juice quality of the current crop harvested in May and June relative to continuously irrigated trees. Drought stress delayed flowering by 2 to 4 weeks so that the immature fruit for next season's crop were smaller than on continuously irrigated trees during June, but fruit growth caught up by September. During mechanical harvesting, previously drought-stressed trees lost fewer young fruit than continuously irrigated trees.

"The results showed that winter drought stress effectively delayed flowering and avoided young fruit loss during late-season mechanical harvesting without negative impacts on yield or fruit quality", Melgar noted.

The researchers observed that rain-excluding covers were used as an experimental tool, but that the covers may not be a viable commercial option for growers. They added that natural cover crops may help in inducing drought stress, but are yet to be tested as a management tool.


'/>"/>

Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

Related biology news :

1. Many urban streams harmful to aquatic life following winter pavement deicing
2. Winter Olympics: Altitude affects skill sports, not just endurance events
3. City of Winter Park Looks to DigitalPersona Software for Stronger Security and CJIS Compliance
4. Where do puffins go in the winter?
5. Multiple health concerns surface as winter, vitamin D deficiences arrive
6. Unique winter-hardy hibiscus has roots with AgriLife Research scientist in Vernon
7. Highest ever winter water temperatures recorded
8. CU-Boulder study shows 53 million-year-old high Arctic mammals wintered in darkness
9. Moving in for the winter toxic brown recluse spiders pose danger
10. Winter brings flu, summer brings bacterial infections
11. Growing drought-tolerant crops inching forward
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Winter drought stress can delay flowering, prevent fruit loss in orange crops
(Date:6/22/2016)... BETHESDA, Md. , June 22, 2016  The American ... by Trade Show Executive Magazine as one of ... Summit on May 25-27 at the Bellagio in ... based on the highest percentage of growth in each of ... number of exhibiting companies and number of attendees. The 2015 ...
(Date:6/22/2016)... , June 22, 2016 On Monday, the ... to industry to share solutions for the Biometric Exit ... Customs and Border Protection (CBP), explains that CBP intends ... departing the United States , in ... to defeat imposters. Logo - http://photos.prnewswire.com/prnh/20160622/382209LOGO ...
(Date:6/20/2016)... -- Securus Technologies, a leading provider of civil ... investigation, corrections and monitoring announced that after exhaustive ... the final acceptance by all three (3) Department ... (MAS) installed. Furthermore, Securus will have contracts for ... October, 2016. MAS distinguishes between legitimate wireless device ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... DIEGO , June 27, 2016  Sequenom, Inc. ... committed to enabling healthier lives through the development of ... Court of the United States ... courts that the claims of Sequenom,s U.S. Patent No. ... patent eligibility criteria established by the Supreme Court,s Mayo ...
(Date:6/27/2016)... ... 2016 , ... Parallel 6 , the leading software as a service ... Virtual Patient Encounter CONSULT module which enables both audio and video telemedicine communication ... , Using the CONSULT module, patients and physicians can schedule a face to face ...
(Date:6/27/2016)... ... June 27, 2016 , ... ... will join the faculty of the University of North Carolina Kenan-Flagler Business ... strategy and entrepreneurship at UNC Kenan-Flagler, with a focus on the school’s international ...
(Date:6/27/2016)... --  Ginkgo Bioworks , a leading organism design ... awarded as one of the World Economic Forum,s ... innovative companies. Ginkgo Bioworks is engineering biology to ... in the nutrition, health and consumer goods sectors. ... including Fortune 500 companies to design microbes for ...
Breaking Biology Technology: