Saturday, April 13, 2024

In-Field Variability Affects Cotton Yields And Quality

• By Denise Attaway •

Most cotton seeds found in individual seed lots are created equally, but not every seed has an opportunity to reach its full potential. Clemson precision agriculture engineer Kendall Kirk wants to help explain why.

in-field variability and cotton yields
Clemson precision agricultural engineer Kendall Kirk has received a grant from the South Carolina Cotton Board to study how field variability relates to cotton yields and fiber quality — photo courtesy Clemson Public Service and Agriculture

Kirk’s goal is to help more cotton seeds develop into profitable crops by understanding what factors are related to producing high-quality, high-yielding crops. He has received a grant from the South Carolina Cotton Board to study how in-field variability relates to cotton yield and fiber quality.

“In this study, we’re looking at cotton yields as related to factors such as disease ratings, insect ratings, thrips ratings and so on,” says Kirk, who is stationed at Clemson’s Edisto Research and Education Center. “This study will help to better understand factors affecting gin turnout and fiber quality, as well as help improve guidelines for identifying management zones in cotton fields.”

Addressing Multiple Factors

Management strategies for different areas of a field can vary to maximize profit; a single practice is not the best for the entire field.

“We want to determine the economic value of these factors and their interactions as related to cotton production,” Kirk says. “This will help South Carolina cotton growers earn more money for their crops.”

In addition to disease, insect and thrips ratings, other factors Kirk will study include soil texture, soil electrical conductivity, soil organic matter content, canopy temperature, soil moisture content, rate of canopy closure, weed pressure, standard soil nutrient tests, nematode counts, picking losses, plant tissue analysis and maturity measurements.

“We will collect data needed to identify yield-limiting factors and their relationships with soil characteristics,” Kirk says.

“Additional tests will be conducted to seek to identify and suggest in-season yield estimators, early disease- and pest-detection indicators, as well as spatial protocols for maturity and plant tissue sampling. Our ultimate goal for the data collected and analyses completed in this study is for this information to be useful for grower management decisions and direction of future cotton research.”

How Results Are Shared

Results from this study and guidelines for cotton yield management will be made available through Clemson Cooperative Extension Service publications, Extension agent training sessions, producer conferences, field days, and other print and electronic media. The South Carolina Cotton Board grant is for one year. Kirk plans to seek additional funding to pay for continuing the study once the initial grant expires.

Cotton is a major crop in South Carolina. According to the National Agricultural Statistics Service, 285,000 acres of cotton were planted in South Carolina this year, an increase of 35,000 acres over 2017 and up from 190,000 acres planted in 2016. Other major crops grown in the state include corn, soybeans, peanuts and wheat.

To see a complete list of technologies and to learn more about Kendall Kirk’s contributions, visit the Clemson University Research Foundation website at

Denise Attaway is with the Clemson College of Agriculture, Forestry and Life Sciences, Public Service and Agriculture.

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