Potassium is essential in the growth and development of the cotton plant. Potassium is essential for many of the enzyme systems in the plant, plays a role in reducing the incidence and severity of the wilt disease, increases water efficiency, affects the speed of almost all plant biological systems, and affects fiber properties such as micronair, length, and strength. Uptake of potassium increases during early boll set with some 70 percent of total uptake occurring after first bloom.
Potassium deficiency symptoms appear as a yellowish-white mottling to a light-yellowish-green color with yellow spots appearing between the veins. The centers of these spots die, and numerous brown specks occur at leaf tips, around margins, and between veins. The tips and margins break down first and curl downward. As symptoms progress, the whole leaf becomes reddish brown, dries, and becomes scorched and blackened in appearance. Premature dropping of leaves is also characteristic and may affect boll development resulting in bolls not maturing or only partially opening and containing poor quality fiber.
The most common source of potassium is muriate of potash (0-0-60). Other sources include potassium sulfate and potassium nitrate.
Follow soil test recommendations where yield potential is less than two bales per acre. If a field has a realistic yield goal of two bales or more, increase the potash rates by 50 percent over the recommendation given on a soil test report from the MCES Soil Testing Laboratory. In some areas of the Delta bordering the brown loam hills, there seems to be some soils that historically test low in potassium, regardless of the use rates. Fields on these soils generally tend to have wilt problems or problems with premature cutout and premature leaf drop. Research is being conducted on these soils to determine the possible cause of these problems and develop corrective recommendations. At this time, it appears that increasing the potassium rate by an additional 50 percent of the MCES soil test recommendation and splitting material into two applications may be beneficial on these soils.
Some research at the Delta Research and Extension Center indicates that there may be some potential for the deep placement of potassium in cotton on soils with subsoils that test low or very low in potassium. These treatments tend to show more potential on soils that do not have a low pH in the subsoil layers and where treatments are made far enough in advance of planting to allow the beds to properly settle.
Potassium fertilization of cotton should receive more attention from farmers.
STARKVILLE, Miss. -- Cotton leafroll dwarf virus is capable of causing significant yield loss and was reported for the first time in Mississippi earlier this year.
The implications of this disease will be a major focus of the 2019 Mississippi State University Row Crop Short Course Dec. 2-4 at the Cotton Mill Conference Center in Starkville. This course is hosted by the MSU Extension Service and Mississippi Agricultural and Forestry Experiment Station.
Parts of Mississippi’s landscape are turning white, but unlike some northern areas, this coloration is caused by cotton bolls opening for harvest, not snow accumulation.
All of Mississippi’s 2019 cotton crop has emerged, but it’s off to a slow start.
Of approximately 700,000 acres of cotton planted statewide this year, 57% is rated fair or worse by the U.S. Department of Agriculture as of July 8.
Although numbers on paper look about right for Mississippi row crops, the reality is actually quite grim in places.
HAMILTON, Miss. -- Determining the extent of tornado damage to farms in Monroe County will take weeks, but video shot from flying drones will speed up the process.
Mississippi State University Extension Service personnel have been assisting in relief efforts since the morning after an EF-2 tornado on April 13 damaged more than 140 homes in Hamilton, claiming one life and injuring 19 others.