If wheat is yellow it's important to determine the cause, Kansas State University says, as growers can take action in some situations and correct the problem.

In recent years, sulfur (S) deficiency in wheat has become common in many areas, particularly in no-till wheat. Classic S deficiency symptoms, confirmed by soil and plant analysis, have been observed in many no-till wheat fields during periods of rapid growth in the spring.

Throughout the growing season, crops may exhibit unusual coloring, stunted growth and leaf damage or defoliation.