As we progress through the reproductive stage of the growing season, many growers have reason for optimism in terms of yield. But, even for those who are having a good year so far, stress from excess heat can have a negative impact on the crop. Agricen’s Scott Lay sat with Dennis Michelsen of WITY Radio to discuss how TERRAMAR can be applied with fungicide to help protect existing yield potential from heat and other weather-related stress.

Dennis - WITY Radio: It’s been a weird year with the weather. I believe all of those different weather factors are adding to crop stress, and we've already had a prolonged period of hot nights.

Scott - Agricen: In the summer months, heat will happen in every zip code, in every crop. It's a matter of trying to protect the yield potential that exists. With TERRAMAR, we have a technology that can help minimize the impact of heat stress on a crop. It’s a good day for a crop if you can minimize the temperature within the crop canopy. What we're seeing in a number of replicated trials is that we can reduce the crop canopy temperature by two to four degrees Fahrenheit with TERRAMAR.

Dennis - WITY Radio: We know we're going to get more heat going forward. How much benefit is there to applying TERRAMAR with fungicides?

Scott - Agricen: Let's review the negative detriments of heat on a crop. We know it impacts the ability of that plant to photosynthesize and to transpire water, and we know that it affects the plant's ability to mobilize nutrients into the plant and fill grain. So, if we can minimize that canopy temperature by two to four degrees with TERRAMAR, that's a positive. Secondarily, if we can increase the amount of nutrient uptake or movement in that plant, that's also a positive. We have documented a nutrient increase in tissue samples in the range of 10 to 15% with TERRAMAR.

Dennis - WITY Radio: Does that translate to yield?

Scott - Agricen: More often than not, it does. But more importantly, at each stage of the game, including the reproductive stage where we are today, we're attempting to increase the amount of nutrients available for that plant—to move starches and sugars to form that grain. If we can do that, we have a better opportunity to yield.

Dennis - WITY Radio: If you look at our weather this year, we had a lot of different weather conditions – from really wet to really dry, and with wind and hail damage in some parts. Now we take that already stressed-out corn, and we add more heat. Is there a cumulative effect of stress on a plant?

Scott - Agricen: I think there is a compounding effect. As we reach the critical reproductive stage, whether it be in corn, soybeans or perhaps other crops, fungicides are often applied to minimize the impact of disease, and that's a step in the right direction. But for factors brought about by the weather, TERRAMAR, in concert with a fungicide, provides a synergistic effect. If we can minimize the impact of a disease like tar spot, gray leaf spot or northern corn leaf blight with a fungicide, while also minimizing the canopy temperature of the crop with TERRAMAR to increase photosynthesis and nutrient uptake, the cumulative effect is positive. We're attempting to preserve yield potential, and we believe that's our best opportunity to do so.

Dennis - WITY Radio: With grain prices where they are, a producer I spoke to recently said he is changing his strategy this year to ensure he can get every additional bushel, because he needs that to make money this year.

Scott - Agricen: Corn and soybean commodity prices are not what they were a year ago, and certainly not what we would like them to be. The only other lever that can be pulled to impact net farm income is the yield. Again, we're not going to increase yield at this point. We're simply trying to preserve what yield potential exists. So if the crop is worth investing in to preserve yield potential, fungicide plus TERRAMAR gives a very consistent payback in terms of return on investment.

TERRAMAR is available from Nutrien Ag Solutions. 

This interview was edited for length and clarity. You can listen to the interview below or on Agricen's YouTube channel.