Fig. 6. Mean root diameter across genotypes for three different rates of N fertilization. Genotypic means of a root variable followed by a different letter are declared to be different from each other (P 
0.05) by an ANOVA-protected LSD test.
Fig. 6. Mean root diameter across genotypes for three different rates of N fertilization. Genotypic means of a root variable followed by a different letter are declared to be different from each other (P 0.05) by an ANOVA-protected LSD test.