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:12/16/2016)... , Dec. 16, 2016 The global wearable medical device ... billion by 2021 from USD 5.31 billion in 2016, at a ... ... driven by technological advancements in medical devices, launch of a growing ... for wireless connectivity among healthcare providers, and increasing focus on physical ...
(Date:12/15/2016)... 2016   WaferGen Bio-systems, Inc. (NASDAQ: ... announced today that on December 13, 2016, it received ... Nasdaq Stock Market LLC which acknowledged that, as of ... common stock had been at $1.00 or greater for ... with Listing Rule 5550(a)(2) of the Nasdaq Stock Market. ...
(Date:12/15/2016)... Dec. 15, 2016 Advancements in ... health wellness and wellbeing (HWW), and security ... three new passenger vehicles begin to feature ... recognition, heart beat monitoring, brain wave monitoring, ... monitoring, and pulse detection. These will be ...
Breaking Biology News(10 mins):
(Date:1/17/2017)... ... January 17, 2017 , ... One Million Solutions in Health ... million in investment towards 15+ TEC Validation Projects™. As a pre-competitive consortium, ... in drug safety assessment, for the industry as a whole. , Through the ...
(Date:1/16/2017)... ... January 16, 2017 , ... Appellate Court of New ... the appeal filed by India-based Dishman Pharmaceutical & Chemical Ltd. company (DPCL) for ... one of its Dishman Group’s 100% wholly owned New Jersey-based subsidiary Dishman USA ...
(Date:1/14/2017)... -- The Alliance for Safe Biologic Medicines (ASBM) today issued ... guidance on biologic naming: We commend ... importance of distinct naming for all biologics, including biosimilars. ... will bring to patients, including new treatment options and ... the Guidance dealing with suffix design remains at odds ...
(Date:1/13/2017)... Island, NY (PRWEB) , ... January 13, 2017 ... ... teamed up with several companies to offer its customers three new solutions for ... probe would come in handy if a customer has an oddly-shaped sample that ...
Breaking Biology Technology: