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Kentucky Bluegrass Response to Potassium and Nitrogen Fertilization

Dep. of Plant Science Unit 4067, Univ. of Connecticut, 1376 Storrs Road, Storrs, CT 06269-4067

View larger version (46K): [in a new window]   Fig. 1. (A) Predicted fall extractable soil K response surface of Kentucky bluegrass turf fertilized with varying rates of N and K. = 118.73 – 0.158N + 0.495K. R2 = 0.978. (B) Predicted spring extractable soil K response surface of Kentucky bluegrass turf fertilized with varying rates of N and K. = 104.10 – 0.167N + 0.442K – 4.654 x 10–5 NK – 2.105 x 10–9 NK3 – 1.491 x 10–11 N2K3. R2 = 0.984.

View larger version (94K): [in a new window]   Fig. 2. Predicted quality response surface of Kentucky bluegrass turf fertilized with varying rates of N and K. = 5.12 + 0.003N – 2.805 x 10–5 N2 + 1.107 x 10–7 N3 – 5.837 x 10–9 N2K. R2 = 0.239.

View larger version (24K): [in a new window]   Fig. 3. Potassium fertilization effects on tissue K concentrations of Kentucky bluegrass at five different sampling periods in 2000 and 2001. L = linear response, Q = quadratic response, C = cubic response, NS = not significant.

View larger version (24K): [in a new window]   Fig. 4. Relationship between tissue K concentration with Kentucky bluegrass quality ratings and clipping dry matter yields. Pearson correlation coefficients (r) are not significant (p > 0.05).

View larger version (40K): [in a new window]   Fig. 5. (A) Predicted apparent N recovery response surface of Kentucky bluegrass turf fertilized with varying rates of N and K. = 35.771 + 0.106K – 3.332 x 10–4 NK. R2 = 0.750. (B) Predicted N use efficiency response surface of Kentucky bluegrass turf fertilized with varying rates of N and K. = 4.126 + 0.012N + 0.047K – 1.816 x 10–4 NK. R2 = 0.860.