Crops in Missouri are showing signs of stress due to lack of precipitation and high temperatures.  This photo of corn was taken outside of Columbia on June 14, 2016. Credit: Photo by Pat Guinan

Crops in Missouri are showing signs of stress due to lack of precipitation and high temperatures. This photo of corn was taken outside of Columbia on June 14, 2016.
Credit: Photo by Pat Guinan

Crops need rain and lower temperatures soon for relief. Most crops are “just a few days away from difficult times,” says University of Missouri Extension agronomy specialist Bill Wiebold.

“We can go from ‘not so bad’ to ‘pretty bad’ quickly,” Wiebold says.

Crops need up to 1-2.2 inches of rain weekly to grow well. In June, most areas of the state fell far behind.

Wiebold points to June rainfall amounts in different areas of the state. Atchison and Boone counties reported only 0.04 inch and only 0.12 inch fell in Knox County in northeastern Missouri in the first week of June. Carroll County received 0.58 inch of rain; Pemiscot got 1.4 inches and Barton had 1.66 inches. In the second week of June, only Barton County received rain, and it was a meager 0.32 inches.

Lack of rainfall and temperatures above 90 degrees in the second week of June raise concerns of possible drought.

MU agronomists in much of the state report that corn plants are “rolling” with dwindling soil moisture and rising temperatures.

Corn leaves roll as a defense mechanism to protect against excessive moisture loss through transpiration. Rolling exposes less leaf surface to the sun’s heat. Lack of water during the time when ear size is developing can spell trouble. Smaller ears with fewer kernels mean lower yields.

Soybean, too, face stress due to lack of rain. Late-planted soybean lack time to develop strong root systems. Early rooting problems—whether due to cool weather, nutrient deficiencies or soil compaction—spell trouble for soybean if drought occurs, Wiebold says.

MU Extension climatologist Pat Guinan said the northeastern quadrant of Missouri faces “very dry” conditions. That area’s high-clay-content soil tends to be more vulnerable to water stress when a dry period emerges. “The forecast is not encouraging,” he says.

Guinan says May precipitation was below normal in the area and the recent hot spell hastened evaporative demand. Vegetation quickly went into stress mode. Also, a large part of the state, extending from northeastern through southwestern Missouri, reports precipitation deficits of 4-8 inches since January 1.

Guinan encourages Missouri residents to submit drought impact reports to the National Drought Mitigation Center. Use the Drought Impact Reporter,http://droughtreporter.unl.edu, to submit reports. These reports provide local expertise to authors of the Drought Monitor map. Drought impact statements are seen by the Drought Monitor author and the general public.

“More participation and input from local Missourians will establish a consensus among folks and hopefully provide a more accurate portrayal of drought in the Show-Me State,” Guinan says.

According to the National Weather Service, the Kirksville station has recorded just 1.49 inches of precipitation in June, nearly three inches less than the normal June rain totals. The bulk of that precipitation was recorded over night on June 20th and in the morning hours of June 21, a storm that largely missed Scotland County.

Compounding the problem are abnormally high temperatures. After a cooler than normal May, June has heated up, approaching 100 degrees on several days, with temperatures on average a full five degrees warmer than the normal June range in Missouri.

The outlook for rain is not good, with national weather forecasts not giving a better than 20% chance for daily precipitation through the first week and a half in July.

Despite the dry conditions, the Scotland County Fire Department has responded to just two natural cover fires in June. But with the Fourth of July holiday looming, there are concerns that number will go up, as fireworks and dry conditions are not a good mix.