Considerations For P and K Application

Listed below are some warning signs that skipping an application could result in yield losses this year:

• You’ve been using half to a third of the recommended rate, applied as a band. This practice relies on the increased plant use efficiency of the banded nutrients to reduce rates. These rates are often below those needed to maintain soil fertility levels. Following this recommendation for many years can deplete soils of P and K. It can also limit yield unless combined with an occasional higher rate broadcast application.

• You’ve been banding lower rates of nutrients for only some of the crops in your rotation. An example is banding low rates of P and K for corn, but not applying any additional fertilizer to the rotational soybean crop. This practice draws down fertility, particularly in the soil between the bands. Problems can especially show up when the row spacing of a crop doesn’t match the spacing of the fertilizer bands. An example is soybeans planted in 7.5 in. rows in a field where 30 in. wide bands of fertilizer were applied for corn. Soybeans between the bands won’t be able to access the banded nutrients and have to rely mostly on the depleted soil between the bands.

• You’ve skipped one or more applications before. Soil supplies can last only so long before they need to be replenished.

• You’ve just rented a new piece of ground. The fertilization history is probably unknown and previous management may not have been up to par. After all, the previous renter isn’t farming it anymore.

• It’s been awhile since you’ve taken soil tests. If you can’t find the last report, it’s probably time to reassess. You don’t want to fl y blindly, especially considering the costs now.

On the other hand, if you’ve been keeping up with maintenance applications and your soil tests are higher, your soil may already have all the P and K the crop needs this year — allowing you to skip. Just remember that what comes out must eventually go back in to sustain fertility.

Leave a Reply

Variable Rate Application Stories
Cotton closeup
Imagery/SensingCotton Growth Management with Precision Agriculture
June 20, 2017
A cotton crop presents some important differences to other commodities that are widely produced in Brazil, such as soybean and Read More
center-pivot-irrigation-drop-sprinklers-on-corn
Variable Rate ApplicationVariable-Rate Fertigation Can Be Simple
June 12, 2017
A rule is a rule is a rule, right? Well, not always. Sometimes, rules are meant to be changed. Most Read More
Mung beans Australia
InternationalPrecision Ag in a Tough Season in Australia
May 8, 2017
This year’s summer crop season has been a tough one for most growers in Australia. Prolonged periods of high temperatures Read More
Industry NewsMonsanto Jettisons 2015 Deere-Precision Planting Deal
May 2, 2017
Deere & Co. announced it was informed by Monsanto Company that it has chosen to terminate a 2015 agreement for Read More
Trending Articles
Yield Data Image
Data ManagementYield Data: More Than a Pretty Picture
July 13, 2017
It is mid-July, which, for the Australian cotton industry, means that picking is still going on for some growers. A Read More
BASF Maglis Grower Tablet
ProfessionalsPatience Needed: Lessons for Getting New Tech onto the Farm
July 6, 2017
A popular joke within the tech industry was trotted out at GAI AgTech Week in Boston, MA, speaking volumes about Read More
PrecisionAg Vision Conference
EventsPrecisionAg® Vision Conference: Focused on the Future
June 13, 2017
PrecisionAg® is pleased to announce the return of its PrecisionAg Vision Conference, October 10-12, 2017. Based on overwhelmingly positive response Read More
Gavin Newsom Forbes AgTech-Summit
ProfessionalsAgTech Summit Aiming High for Modern Farming Solutions
June 12, 2017
THRIVE AgTech, in partnership with SVG Partners and Forbes, is hosting the third annual Forbes AgTech Summit June 28-29 in Read More
Quantix Drone Farmer
DronesTop 10 Most Intriguing Technologies in Agriculture
June 3, 2017
This may be a bit of stating the obvious here, but we’ll throw it out there anyways: as much as Read More
Farming iPad
Data ManagementOpinion: ROI or Die in Precision Agriculture
May 12, 2017
The thought of $3.50 corn for the foreseeable future seems pretty disheartening. However, if you look at the precision ag Read More
Latest News
Industry NewsLindsay Corp. Names Dow’s Timothy Hassinger New C…
July 19, 2017
Lindsay Corp. has  announced the appointment of Timothy Hassinger as president and CEO and a member of its board of Read More
InfoAg 2015
Events2017 Awards of Excellence Winners Announced
July 18, 2017
PrecisionAg Institute is pleased to announce its Awards of Excellence winners for 2017. Honorees of this year’s prestigious award are Read More
Interseeding Cover Crops
ProfessionalsA 3-Step Approach to Interseeding Cover Crops
July 18, 2017
As growers continue to search for opportunities to create healthier soils and increase yields, more trusted advisors and farmers are Read More
Rod Weimer and Paul Schrimpf
Excellence AwardsPast Recipients Of The PrecisionAg Awards Of Excellence
July 18, 2017
Since 2007, the PrecisionAg Insititute has sponsored the annual Awards of Excellence program. Here's a list of the past winners. Read More
Data ManagementEFC Announces FieldAlytics, Adapt-N Expanded Integratio…
July 17, 2017
EFC Systems is pleased to announce an expanded integration between its FieldAlytics product and Agronomic Technology Corp’s Adapt-N nitrogen recommendations Read More
Data ManagementOpinion: Benchmarking in Precision Agriculture is Big S…
July 17, 2017
Benchmarking has become a buzzword in precision agriculture recently and before we get too excited with all of the profound Read More
Yield Data Image
Data ManagementYield Data: More Than a Pretty Picture
July 13, 2017
It is mid-July, which, for the Australian cotton industry, means that picking is still going on for some growers. A Read More
Industry NewsQuick Rewind: Ohio Dealer Talks Deere-Precision Plantin…
July 12, 2017
A few weeks ago I took a quick trip south down I-71 to Central Ohio (for you non-Buckeyes, I-71 runs Read More
DronesSentera Launches Versatile Quad Sensor for Drones
July 12, 2017
Fully Customizable Filters on Sentera Quad Sensor Allow for Unique Crop Health Detection Capabilities Sentera introduces the latest update to Read More
Hortau Irrigation Management Software
Sensors/IoTHortau Named Finalist for CogX Artificial Intelligence …
July 10, 2017
Hortau was recently named a CogX Award finalist in the Best Artificial Intelligence Product in Agriculture category. The awards were Read More
Grower Services & SolutionsVantage South Atlantic Announces Mid-South Expansion
July 10, 2017
Vantage South Atlantic announced that it has joined Trimble Agriculture’s global network of independent Vantage partners to provide farmers, advisors, Read More
Ag Retailer and Grower WinField United
Decision Support SoftwareAgronomic Technology Corp Surpasses Daily Nitrogen Reco…
July 6, 2017
Agronomic Technology Corp, a leader in agricultural field modeling for soil, water, crops, and fertilizer, for the first time surpassed Read More
Precision IrrigationDealership Celebrates 25 Years in the Irrigation Game
July 6, 2017
25 years ago, Bobby Kempenich had an idea. An idea to launch a business that combined his knowledge of irrigation Read More
BASF Maglis Grower Tablet
ProfessionalsPatience Needed: Lessons for Getting New Tech onto the …
July 6, 2017
A popular joke within the tech industry was trotted out at GAI AgTech Week in Boston, MA, speaking volumes about Read More
Deere R4023 cab
Business ManagementOpinion: Reality vs. Hype in Precision Agriculture
July 6, 2017
I think there is a certain word that can accurately describe much of the precision ag and/or ag tech industry right Read More
Events2017 agBOT Challenge Winners Announced
July 6, 2017
Driverless robotic machines entered the fields of Gerrish Farms in Rockville, IN in June 2017. Universities and entrepreneurial teams showcased Read More
gomez-featured
ProfessionalsCommitment to Ag Innovation: Q&A with DuPont Pionee…
July 5, 2017
Editor’s note: PrecisionAg.com contributor Amy Wu often writes about women in ag technology. Recently, she interviewed DuPont Pioneer’s Nadilia Gomez, research scientist, Read More
LAP
InternationalLAP and ABPSAP: Advancing Precision Agriculture in Braz…
July 5, 2017
In this article, I would like to highlight two important entities of precision agriculture in Brazil. The first of these Read More