Table 4.

Analysis of the effect of competition with neighbor wheat plants on the growth and reproductive potential of R and S blackgrass target plants.

Term	DF	SSq	F	P
Vegetative biomass
Wheat biomass	1	314.609	150.915	< 0.001***
Target phenotype	1	6.492	3.114	0.081
Wheat biomass × Target phenotype	1	0.612	0.294	0.589
Reproductive biomass
Wheat biomass	1	56.683	127.038	< 0.001***
Target phenotype	1	0.346	0.777	0.380
Wheat biomass × Target phenotype	1	0.785	1.760	0.188
Reproductive productivity
Wheat biomass	1	0.082	7.224	0.008**
Target phenotype	1	0.229	20.095	< 0.001***
Wheat biomass × Target phenotype	1	0.009	0.798	0.374
Maximum height
Wheat biomass	1	98.544	5.039	0.027*
Target phenotype	1	10078	0.515	0.475
Wheat biomass × Target phenotype	1	119	0.006	0.938
Seed-head number
Wheat biomass	1	14738.8	157.166	< 0.001***
Target phenotype	1	41.9	0.447	0.506
Wheat biomass × Target phenotype	1	8.1	0.086	0.770
Total seed-head length
Wheat biomass	1	53845108	168.420	< 0.001***
Target phenotype	1	4753	0.015	0.9032
Wheat biomass × Target phenotype	1	53238	0.167	0.6841

All measurements were taken destructively at reproductive maturity. Reproductive productivity represents the ratio of reproductive biomass (seed + seed-heads) : vegetative biomass (leaf + stem tissue), providing an estimate of investment into reproductive tissue per gram of vegetative tissue. Significance values following linear regression analysis are reported. The degrees of freedom (DF), sums-of-squares (SSq), F-statistic (F) and associated P-value (P) are shown, with asterisks denoting significance at: ^∗P ≤ 0.05, ^∗∗P ≤ 0.01, ^∗∗∗P ≤ 0.001).