Fig. 1.

2005 experimental design for a single position within a location. Two replicates of thinning treatments in nonrandomized 60 and 120 kg N ha−1 strips. X denotes a randomized sample area. See Materials and Methods section for a detailed description.

 


Fig. 2.

Red clover stand count for each week at each location in 2005. Data points are the thinning treatment means on a given sample week under each N rate. Week 1 (17–27 May) is the first sample week of data collection. * indicates thinning treatment means that are significantly different at P < 0.05.

 


Fig. 3.

Red clover stand count for each week at each location in 2006. Data points are the N rate and thinning treatment means on a given sample week. Week 1 (12–17 May) is the first sample week of data collection. * indicates thinning treatment means are significantly different at P < 0.05. θ indicates N rate treatment means are significantly different at P < 0.05.

 


Fig. 4.

Light penetration through the wheat canopy for each week at each location in 2005. Data points are the thinning treatment means on a given sample week under each N rate. Week 1 (17–27 May) is the first sample week of data collection. * indicates thinning treatment means are significantly different at P < 0.05.

 


Fig. 5.

Light penetration through the wheat canopy for each week at each location in 2006. Data points are the N rate and thinning treatment means on a given sample week. Week one (12–17 May) is the first sample week of data collection. * indicates thinning treatment means are significantly different at P < 0.05; θ indicates N rate treatment means are significantly different at P < 0.05.

 


Fig. 6.

Soil gravimetric water content (0–22.5 cm) [g water (g dry soil)−1] for each week at each location in 2005. Data points are the thinning treatment means on a given sample week under each N rate. Week 1 (17–27 May) is the first sample week of data collection. * indicates thinning treatment means are significantly different at P < 0.05; WH indicates approximate date of winter wheat harvest.

 


Fig. 7.

Soil gravimetric water content (0–22.5 cm) [g water (g dry soil)−1] for each week at each location in 2006. Data points are the N rate and thinning treatment means on a given sample week. Week 1 (12–17 May) is the first sample week of data collection. * indicates thinning treatment means are significantly different at P < 0.05; θ indicates N rate treatment means are significantly different at P < 0.05; WH indicates the approximate date of winter wheat harvest.

 


Fig. 8.

End of season (Sample Week 20) red clover dry weight (g m−2) response to mean light penetration at each sample week, 2005 and 2006. Data points are the N rate × thinned treatment interactions for each location. In 2005, the PJF location was not included as final red clover dry weight was not taken.

 


Fig. 9.

End of season (Sample Week 20) red clover dry weight (g m−2) response to mean soil gravimetric water content at each sample week, 2005 and 2006. Data points are the N rate × thinned treatment interaction means for each location.