Our Insights | Plant Nutrition
September 05, 2019

Nutrient Solutions on Turf for Early Fall

The calendar says it’s still summer, but preparation for fall nutrient management should begin in earnest for cool and warm season turf mangers. Regardless of location, focus on a complete and balanced attack – either liquid or granular applications. For northern climates, apply higher doses of nitrogen (N) to encourage shoot growth and recovery from mechanical or environmental stress. Begin routine and low dose potassium (K) inputs to facilitate correct osmotic functioning in the final days of summer and prime plants for the mid-fall hardening off process.

 

Potassium (K) may not influence turfgrass growth in a big way, however it plays a key role in plant tolerance to drought, cold, wear and salinity stresses. K becomes less available on sandy soils because of the typically low cation exchange capacity (CEC) and high leaching potential.  Using a highly efficient foliar fertilizer source can bypass these limitations.  Did you know that the starch synthase enzyme requires K to transform soluble glucose into the starch storage form?  Scientists at Rutgers University have determined that exchangeable soil K of 50 ppm and 2% tissue K concentration as minimum critical levels that will limit anthracnose incidence and severity on annual bluegrass putting greens.

 

Choosing a highly efficient K source will maximize tissue concentration. The Proven GRIGG Foliar fertilizer line has been tested for efficiency with tremendous results (see graphs).