Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Improving fertilizer efficiency

23.09.2003


A new study suggests in-season nitrogen monitoring can reduce overall fertilizer use


Many producers currently base nitrogen fertilizer applications on the results of soil nitrate tests. According to a recent article in the Soil Science Society of America Journal, farmers can reduce in-season nitrogen use for irrigated crops without sacrificing yield potential by using commercially available nitrogen sensing tools.

The typical spring soil nitrate tests do not account for nitrate loss or gain between soil sampling and planting, notes Kevin Bronson, associate professor of soil fertility and nutrient management with the Texas Agricultural Experiment Station. His study suggests in-season monitoring may lead to more accurate nitrogen fertilizer recommendations. Bronson led an interdisciplinary team of scientists to test in-season nitrogen using monitoring tools at two irrigated west Texas cotton sites in 2000 and 2001.

Based on spectroradiometer and chlorophyll meter readings, the team applied 30 pounds per acre of nitrogen in-season to their plots when indicated at early squaring, early bloom and peak bloom.



In 2000, they applied 30 to 90 pounds per acre less nitrogen than a soil-test recommendation of 120 lbs. per acre and achieved yields similar to plants receiving 120 pounds per acre. In 2001, cotton yields reached their goal of 2.5 bales per acre.

"In-season nitrogen sensing won’t replace spring soil nitrate tests," Bronson says. "It can, however, reduce in-season nitrogen fertilizer rates in low-yielding seasons and it can help match soil test recommendations for yield potential in high-yielding seasons. We still recommend pre-plant soil testing to accurately gauge early season nitrogen needs when plants are too small to use monitoring instruments, and for determining nutrient needs besides nitrogen."

In addition to helping producers save dollars by reducing nitrogen applications, these monitoring tools can help protect ground and surface waters from nitrate contamination by reducing the amount of residual nitrate nitrogen in the soil at harvest, Bronson adds

Tess Chua of Texas A&M is the senior author on the paper. Co-authors include Jon Booker, Wayne Keeling, Jim Bordovsky and Robert Lascano, Texas A&M University; Cary Green and Eduardo Segarra, Texas Tech University; and Arvin Mosier, USDA-ARS.



Soil Science Society of America Journal (SSSAJ), http://soil.scijournals.org is a peer-reviewed, international journal of soil science published six times a year by the Soil Science Society of America. SSSA Journal contains soil research relating to physics; chemistry; biology and biochemistry; fertility and plant nutrition; genesis, morphology, and classification; water management and conservation; forest and range soils; nutrient management and soil and plant analysis; mineralogy; and wetland soils.

The American Society of Agronomy (ASA) www.agronomy.org, the Crop Science Society of America (CSSA) www.crops.org and the Soil Science Society of America (SSSA) www.soils.org are educational organizations helping their 10,000+ members advance the disciplines and practices of agronomy, crop, soil sciences, and related fields by supporting professional growth and science policy initiatives, and by providing quality, research-based publications and a variety of membership services.

Sara Uttech | EurekAlert!
Further information:
http://www.asa-cssa-sssa.org/
http://soil.scijournals.org
http://www.agronomy.org

More articles from Agricultural and Forestry Science:

nachricht Alkaline soil, sensible sensor
03.08.2017 | American Society of Agronomy

nachricht New 3-D model predicts best planting practices for farmers
26.06.2017 | Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign

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: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

A Map of the Cell’s Power Station

18.08.2017 | Life Sciences

Engineering team images tiny quasicrystals as they form

18.08.2017 | Physics and Astronomy

Researchers printed graphene-like materials with inkjet

18.08.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>