Calcium Products - Three Tips to Spot Sulfur Deficiency in Corn
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Three Tips to Spot Sulfur Deficiency in Corn

Sulfur Deficiency

Now is the time to start scouting for sulfur deficiency in corn plants. As you’re out and about this spring, keep these three tips in mind to successfully identify sulfur deficiency.

  1. Check young corn plants. Sulfur deficiency is most obvious early in the growing season, when the plant is most vulnerable to nutrient shortages.
  2. Look at leaf color. From afar, plants with a pale green appearance should be inspected closer for nutrient deficiency symptoms. Both sulfur and nitrogen deficiency are marked by yellow striping between the veins of the leaf (interveinal chlorosis), which can cause confusion when diagnosing sulfur vs. nitrogen deficiency. The image above shows sulfur deficiency.
  3. Inspect plants’ youngest leaves. Sulfur deficiency shows up in the youngest leaves of the corn plant first, while nitrogen deficiency appears in the older leaves first. The difference is related to how each nutrient is mobilized in the plant.

The good news is that sulfur deficiency can be quickly corrected with a broadcast application of SuperCal SO4. An application rate of 100-150 lbs/acre will result in plant green-up in as little as seven days.

Keep in mind, corn needs sulfur throughout the growing season, so make sure you are supplying a source that offers flexible application timing and a release pattern that is compatible with plant requirements. For more details, click or tap to watch the video below comparing SuperCal SO4 and AMS.

Additional Info

  • Article Reference:: Calcium Products, Inc.
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A natural source of calcium and humic substances.

Humic substances derived from leonardite are blended with our calcium products to create a synergistic pellet that will provide all of your calcium and humic needs. Calcium fertility is often pushed aside in favor of concentrating on the ‘big three’. Calcium nutrition is vitally important to overall plant health and SuperCal Humic delivers one of the purest sources of calcium on earth.

Provides sulfur in sulfate form.
Sulfate from our extremely pure calcium sulfate is the main form of sulfur taken up by plants and is immediately available for plant use after the pellets begin to break down when exposed to water.
Provides a chelated form of calcium.
The interaction between organic acids derived from humic substances and calcium results in a chelated form of calcium that will not bind up with other compounds in the soil, meaning the calcium will be available for plant uptake.
Improve plant uptake of soil nutrients, especially calcium, phosphorus, iron, zinc and other micro nutrients.
Humic substances have been shown to help plant uptake of many different macro- and micronutrients.
Increases CEC to improve nutrient holding capacity and reduce leaching.
Humic substances are exceptional sources of organic matter for your soil and their chemical properties can help your soil’s ability to exchange cations and thereby hold nutrients.
Increases soil water holding capacity.
In loosely textured soils, water holding capacity can be an issue. Adding organic matter in the form of humic substances can help increase the water holding capacity of your soil.
Q: What is SuperCal Humic?

A: SuperCal Humic is a humic product consisting of a proprietary blend of humic substances, sulfur, and calcium based products that are mixed with a binder to form a pelletized product.

Q: What are humates?
A: Humates are the mineral (metal) salts of humic acids and the term is often used incorrectly to describe the entirety of ‘humic substance-based’ products in the market.
Q: What are humic substances?
A: Humic substances are mined from deposits in the earth of dark colored substances that have reached the final stages of biodegradation. Think of the term ‘humus’ in soil, humic substances are essentially deposits of humus that have undergone biodegradation and other geological processes for long periods of time.
Q: What are humic acids?
A: Humic acids is a broad term used in commerce and science to identify a class of isolated compounds that can be extracted from natural humic substances in a number of ways, typically with alkali solutions, and then precipitated from the alkaline aqueous solutions by acidification. (From HPTA website)
Q: What are fulvic acids?
A: Fulvic acids is a broad term used in commerce and science to identify a a class of isolated compounds extracted from nautral humic substances that are soluble in both alkali and acidic aqueous solutions. (From HPTA website)
Q: Why should I use SuperCal Humic?

A: SuperCal Humic can increase root growth in plants, which has many subsequent benefits such as increased nutrient uptake (especially those that are immobile in the soil) and increased drought tolerance.

Q: Can SuperCal Humic be applied with other dry fertilizers?

A: Yes, SuperCal Humic can be broadcast with any normal dry fertilizer application device and when applied with fertilizer can increase the availability of the nutrients to the plant.

Q: What rate of SuperCal Humic should I apply?

A: SuperCal Humic should be applied at 200 lbs/acre on any soil. This rate is designed to apply the right rate of humic substances to your plants

Gypsum helps reclaim sodic soils
Gypsum is used in the reclamation of sodic soils. Where the exchangeable sodium percentage (ESP) of sodic soils is too high, it must be decreased for soil improvement and better crop growth. The most economical way is to add gypsum, which supplies calcium. The calcium replaces the sodium held on the cation exchange sites in the soil. The sodium can then be leached from the soil.