Purdue University Research

Results from Fall 2021

Summary of Results Fall 2021

Visual Quality:

          For visual appearance/turf quality the values ranged from 5.5-8.6 (minimally acceptable equals 6.0) and varied by date and product applied.

          For mean quality the values ranged from 5.9 to 7.5 with all treatments being superior to the non-treated control (5.9).

          The greening/growth response following the first application (18 Aug.) was not very dramatic, likely due to prolonged warmth, dry conditions and possibly some late-summer turf stress but some treatment separation became evident on 19 September.

Relative chlorophyll content:

      For relative chlorophyll content, values ranged between 311-541, varying with fertilizer treatment and measurement date.

        Increased relative chlorophyll content was observed with all fertilizer treatments compared to the non-fertilized control. 

Turf color:

       For turf color, values ranged from 0.669-0.759, with all treatments being superior to the non-treated control.

      On 1 October and 19 October, increased color was observed for FloridaGreen and competitors.

Summary of Results Summer 2021

Visual Quality:

       For visual appearance/turf quality the values ranged from 4.4-7.6 (minimally acceptable equals 6.0) and varied by date fertilizer product application rate.

       For mean quality the values ranged from 5.2 to 6.5 with all treatments being superior to the non-treated control (5.2).

       Increased turf quality values were observed with a synthetic competitor and the biosolid fertilizers for FloridaGreen applied at 0.75 lb N/M and 1.0 lb N/M compared to FloridaGreen applied at 0.5 lb N/M.

      The longevity of the greening responses of these fertilizers was about 5-7 weeks. For example the greening response relative to the non-fertilized control from the 24 June application lasted until about 3 August. 

Relative chlorophyll content:

       For relative chlorophyll content, values ranged between 274-446, with all treatments being superior to the non-treated control.

 

       From 11 June to 22 July, all fertilizer treatments had increased relative chlorophyll content compared to the non-fertilized control.  

Turf color:

       For turf color, the mean values ranged from 0.655-0.706, with all treatments being superior to the non-treated control.

 

       Increased color was observed in all fertilization treatments, while the lowest turf color values were observed in plots without nitrogen applications.