Navigation Links
Crop models help increase yield per unit of water used
Date:5/4/2009

MADISON, WI, May 4, 2009 -- Crop water use efficiency (WUE, or yield per unit of water used), also known as crop water productivity, can be improved through irrigation management and methods, including deficit irrigation (irrigating less than is required for maximum yields) and supplemental irrigation (irrigating to supplement precipitation so as to avoid crop failure or severe yield decline). Thus, WUE is key for agricultural production with limited water resources.

Policymakers and water resource managers working at all scales need to evaluate the many ways in which cropping systems and the amounts, timing, and methods of both irrigation and fertilizer applications may be changed to improve WUE while meeting yield and harvest quality goals. Field experiments are too costly to address all scenarios, but computer models of crop growth and yield may fill in the gaps if the models are shown to be accurate predictors of WUE.

An international team of experts led by the Food and Agriculture Organization of the United Nations developed an agronomic model called AquaCrop to address the need for modeling of WUE under widely varying conditions around the world and with limited data.

To look at the ability of this and other agronomic models to estimate WUE, a team member with the USDA Agricultural Research Service, Bushland, TX, organized a symposium, "Yield Response to Water: Examination of the Role of Crop Models in Predicting Water Use Efficiency," at the 2007 Annual International meeting of the Agronomy Society of America. Results using several agronomic models were discussed.

Nine papers arising from the symposium are published in a special section of the MayJune 2009 issue of Agronomy Journal. The papers explore how four of the simulation models were used to simulate yield, water use, and WUE of cotton, maize (corn), quinoa, and sunflower in North and South America, Europe, and the Middle East. All the models simulated WUE adequately under well-watered conditions, but tended to overestimate or underestimate WUE under conditions of water stress. This limits their usefulness for exploration of deficit irrigation scenarios or rain-fed or dryland situations with less than adequate water.

According to symposium organizer Steve Evett, "Future studies exploring WUE simulation should include evaporation or transpiration measurements in addition to total crop water use measurements. In doing so, management methods that reduce evaporation in favor of transpiration can be studied and models of WUE can be tested and improved."

This examination of WUE estimation by multiple models helps close the gap that exists between what can be done using crop simulation models and what policymakers and managers need from these models in order to develop useful management alternatives for crop selection and timing, tillage systems, and irrigation and fertilization practices. Development of AquaCrop and several other models is continuing and will be guided by the findings of these studies.


'/>"/>

Contact: Sara Uttech
suttech@agronomy.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

Related biology news :

1. CSHL team develops mouse models of leukemia that predict response to chemotherapy
2. Disease Models & Mechanisms -- selected for indexing in Medline
3. New models question old assumptions about how many molecules it takes to control cell division
4. Bacteria are models of efficiency
5. David Rose to present Howe School lecture on new technologies and business models, Jan. 29
6. Models simulate nitrate dynamics in Garonne, Southwest France
7. New movement models tested at the Smithsonian in Panama
8. Swamping bad cells with good in ALS animal models helps sustain breathing
9. Models of eel cells suggest electrifying possibilities
10. In computer models and observations, researchers see potential for significant red tide season
11. Arctic climate models playing key role in polar bear decision
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2017)... 10, 2017 Research and Markets ... "Personalized Medicine - Scientific and Commercial Aspects" to their ... ... is integrated with therapy for selection of treatment as well ... and prevention of disease in modern medicine. Biochip/microarray technologies and ...
(Date:2/8/2017)... 2017  Aware, Inc. (NASDAQ: AWRE ), a ... results for its quarter and year ended December 31, 2016. ... was $3.9 million compared to $6.9 million in the same ... 2016 was $0.6 million compared to $2.6 million in the ... of 2016 was $0.5 million, or $0.02 per diluted share, ...
(Date:2/8/2017)... Feb. 7, 2017 Report Highlights ... 2021 from $8.3 billion in 2016 at a compound ... 2021. Report Includes - An overview of the ... trends, with data from 2015 and 2016, and projections ... Segmentation of the market on the basis of product ...
Breaking Biology News(10 mins):
(Date:2/16/2017)... WEST PALM BEACH, Fla. , Feb. 16, ... molecular diagnostics company revolutionizing the development of liquid ... that it has entered into an exclusive license ... who will distribute MDNA,s proprietary liquid biopsy test ... in South Korea . This ...
(Date:2/16/2017)... 16, 2017   Biostage, Inc. (Nasdaq: ... company developing bioengineered organ implants to treat cancers and ... announced today the closing on February 15, 2017 of ... common stock and warrants to purchase 20,000,000 shares of ... The offering was priced at $0.40 per share of ...
(Date:2/16/2017)... , Feb. 16, 2017  Champions Oncology, Inc. ... the development and sale of advanced technology solutions and ... drugs, today announced the addition of new cohorts of ... These new models will expand Champions, product line in ... and neck cancer, AML, and non-small cell lung cancer ...
(Date:2/16/2017)... and NEW YORK , Feb. 16, ... completion of their $7M Series B financing, adding an ... the $3.5M led by Mesa Verde Venture Partners and ... resources will be directed towards further accelerating commercial adoption ... comprehensive genomic profiling test and expanding the Paradigm cancer ...
Breaking Biology Technology: