Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cool temperatures chill soybean growth, specialist says

16.06.2004


Soybean crops planted weeks ago appear in no hurry to grow. Others aren’t turning a rich green in color. And while growers might be starting to worry, there’s no need to fret, said Ellsworth Christmas, Purdue University Extension soybean specialist.



"There are two basic questions producers have at this time," Christmas said. "No. 1, why are soybeans that have emerged growing so slowly? And, secondly, why are the plants yellow or very light green in color? Both of those concerns are directly related to temperatures - both of the air and the soil."

Although temperatures are beginning to heat up, conditions during and just after planting weren’t warm enough to activate soybean plants, Christmas said.


"If you go back almost three weeks from June 5, you’ll find temperatures have been very, very cool at night," he said. "Across the northern third of Indiana, most of the nighttime lows have been in the mid- to upper 40s, with a few in the low 40s at selected sites around that area. In central and southern Indiana, temperatures have been in the low to mid-50s.

"Those temperatures are too low for good, vigorous soybean growth. A soybean plant’s growth will slow when nighttime temperatures reach 60 degrees. When nighttime temperatures reach 40 degrees, the plant essentially stops growing for two to three days until those nighttime temperatures rise to or above 60 degrees. Any beans planted during the period of time when soil temperatures were in the 60-degree range or lower emerged rather slowly. Now, beans are emerging in about five days or less because of very warm soil conditions."

Soybeans thrive at soil temperatures between 70 degrees and 80 degrees. Most Indiana soils have been in that ideal range since Monday (June 7).

Slow growth could result in additional plant stress but should not reduce soybean yields, Christmas said.

"The long-term effect is that lower internodes on soybean plants will remain short," he said. "If you look at the length of those internodes, they are relatively short and will not lengthen. That length is fixed once the leaf reaches its full size, and then the internode below that leaf is fixed. That means that podding could be a little low on the plant this year, and that’s a risk."

Sluggish growth also has hindered soybean plants from taking on deeper green hues. That problem is mostly cosmetic, Christmas said.

"In terms of plant color, that’s caused by a nitrogen deficiency," he said. "Cool soil temperatures not only impact plant growth but also bacterial growth. Bacteria are the organisms that fix the nitrogen in the nodules on a soybean plant. Normally, nodules do not supply an adequate amount of nitrogen to the soybean plant until that plant reaches about V4 stage of growth."

The V4 growth stage is vegetative and refers to the number of trifoliolates - or three-leaf clusters - on the plant.

Source: Ellsworth Christmas, (765) 494-6373, echristmas@purdue.edu

Ag Communications: (765) 494-2722; Beth Forbes, forbes@purdue.edu
Agriculture News Page

Steve Leer | Purdue News
Further information:
http://news.uns.purdue.edu/UNS/html3month/2004/040611.Christmas.soybeans.html

More articles from Agricultural and Forestry Science:

nachricht Filling intercropping info gap
16.11.2017 | American Society of Agronomy

nachricht Climate change, population growth may lead to open ocean aquaculture
05.10.2017 | Oregon State University

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>