Pearson's correlation coefficients among traits in a double haploid mapping population (TN DH) derived from a cross between a P-efficient cultivar, Ningyou 7 and a P-inefficient cultivar, Tapidor under low (below diagonal) and optimal phosphorus (above diagonal) conditions.

Note: Height to the first primary branch (cm; FBH), plant height (cm; PH), relative first primary branch height (the ratio of FBH to PH; RBH), number of primary branches per plant (N; BN), seed weight of 1,000 seeds (g per 1000 seeds; SW), seed number per pod (N; SN), pod number per plant (N; PN), seed yield per hectare (kg·ha−1; SY). **P<0.01, *P<0.05.