• Plant Health
  • Aug 07, 2019

Don't Let a Boron Deficit Compromise Your Corn

Cornfield at sunrise
You don’t need me to tell you that the 2019 growing season has been one of extremes. By and large, we’ve had far too much rain over wide swaths of the country. Besides having a potentially negative effect on crop yields come harvest, there can be a host of other challenges brought about by excessive moisture. One of them could be boron deficiency in corn.

Why is boron so important?

Boron plays a key role in flowering, pollen development and viability, and the pollination process. Most boron is accumulated in the corn plant just prior to pollination to support reproductive growth in tassels and ears.
However, because it is mobile in the soil, boron can leach from the soil profile, especially during wet conditions, which can negatively affect plant uptake and yield potential. If boron is not available, plants produce pollen without the starch required for growth once the pollen lands on a silk. A severe boron deficiency may result in a completely barren plant where an ear shoot may not even develop.

How does excessive rainfall accelerate boron loss?

Early-season rains can move boron out of the corn root zone, increasing the risk of deficiency. This insight is supported by WinField® United NutriSolutions® tissue sampling data from 2019. These graphics show that more than 85% of 2019 corn tissue samples are deficient in or could benefit from a boron application. This is a substantially higher percentage than was reported in any of the previous seven years, when results fluctuated between 55% and 75%. Overall, this trend indicates a higher likelihood of boron deficiency across corn acres this year. Talk with your agronomist about tissue testing or making a boron application, especially if heavy rains occurred in your area.

Why is it important to apply boron?

Boron is relatively immobile in the plant until it begins to move to the reproductive parts of the plant during the onset of pollination. As boron moves to the tassel and silks, it becomes deficient in the leaf tissue. Since one of boron’s other jobs is to move sugars throughout the plant, this deficit during the beginning of reproduction means the plant runs a risk of less efficient sugar transport. Fixing a boron deficiency can help the plant optimize photosynthesis as well as sugar transport, which are both necessary for corn plants to thrive.

What could an application of boron do?

Targeting boron at the leaf tissue can help mobilize sugars and feed the newly fertilized kernels in the beginning stages of blister and milk. Boron also helps with flowering set and fruiting while playing a role in pollen survivability and silk rigidity. And boron helps organize cell structure, particularly in the xylem and phloem — the “transportation highways” of the plant. This organization can help increase cellular activity and boost nitrogen efficiency and carbohydrate metabolism.

When should I apply boron?

Boron should be applied between the late vegetative and R1 growth stages to optimize efficacy. Micronutrients like MAX-IN® Boron can be applied on corn between VT and R1 at a rate of 12 to 16 fl. oz. per acre. Such foliar applications can help improve the boron status of corn and reduce the potential for yield loss.

What else can I use in my tank mix?

MAX-IN Boron can be tank mixed with fungicides as well as with adjuvant technologies such as MasterLock® adjuvant. However, be sure to read and follow fungicide label instructions before applying between the V8 and VT growth stages. MAX-IN Boron can also be tank mixed with insecticides. Consult your agronomist to ensure you are applying the correct tank-mix partners at the correct rates and at the optimal times.
Even though our season has been challenging, there’s no reason you shouldn’t continue to manage your most promising cornfields — especially with corn prices on the rise. Don’t let a treatable boron deficiency take a toll at harvest. Work with your locally owned and operated WinField United retailer now to manage nutrients so you can harvest the kind of corn crop you’ve worked so hard to achieve.

All photos are either the property of WinField United or used with permission. 
© 2019 WinField United. Important: Before use always read and follow label instructions. Crop performance is dependent on several factors many of which are beyond the control of WinField United, including without limitation, soil type, pest pressures, agronomic practices, and weather conditions. Growers are encouraged to consider data from multiple locations, over multiple years, and be mindful of how such agronomic conditions could impact results. MasterLock®, MAX-IN®, NutriSolutions® and WinField® are trademarks of WinField United. 

Plant Health