While some parts of the country have been struggling with excessive rainfall, other regions have been particularly dry. The dry weather can cause the slightest irrigation or root system defects to appear as withered, tanning lawns.

In the next one to two months, dry soil is a likely cause of brown spots in the lawn. dry soil is not the only possible cause, but a very likely cause.

Determining whether dry soil is the cause of brown lawns can be easy, but is often overlooked. Landscape professionals dig through the lawn and determine whether the soil around the root zone is dry. You will also look for other possible causes, such as: B. chinch bugs or maggots. They then check the irrigation system to see if there is a shortage.

The only soil moisture that benefits a plant is the soil moisture in the root zone area. The plant does not benefit from moisture below the root zone. If the root system is short, you have to water more often. Many factors can inhibit good root growth. This can be a problem for the entire lawn or just for localized areas. When the soil moisture in the root zone area is exhausted, wilting and brown spots are the result. In dry weather, even with the best irrigation systems, localized dry spots can occur and irrigation of the spots may be required.

Understand your lawn's need for moisture:

  • The vegetable use of water is called perspiration. The evaporation of water from the soil is called evaporation. The combination of the two (evaporation and perspiration) means that moisture is used in the soil in the root area. The combination of perspiration and evaporation is known as evapotranspiration and is often referred to as "ET". At this time of year (warm, dry spring and in an open, sunny area), it is common for ET to consume about 0.15 to 0.2 inches of water from the ground each day.
  • Sandy soil usually holds ½ inch of water in 6 inches of soil. If the plant's root system is 6 inches long, the plant has access to ½ inch of water. If the plant's root system is 3 inches long, it will only have access to about ¼ inch of water.
  • The lawn begins to wither when half of the available plant water has been used up.

So if "ET" is 0.15 inches per day and the plant has a 6 inch deep root system, half of the available plant water (0.25 inches) will be used up in just under 2 days (0.25 divided by 0.15 = 1) , 67). With the same soil moisture and the same ET rate, a plant with a root system depth of only 3 inches would consume the plant's available water in less than a day.

A good understanding of this rather complex problem is important to keep your lawn healthy and green. For more information or to arrange a free inspection, CLICK HERE.