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The TBDM was calculated by adding forage, stubble, and root DM yields.
The RWR was calculated as root DM yield divided by TBDM. The LWR was calculated as leaf DM yield divided by FDM.
Analysis of variance comparing 10 genotypes, under two N rates, for forage DM yield (FDM), forage N accumulation (FNA), forage N concentration (FNC), leaf weight ratio (LWR), root weight ratio (RWR), total biomass DM yield (TBDM), total biomass N accumulation (TBNA), total biomass N concentration (TBNC), neutral detergent fiber (NDF), in vitro true digestibility (IVTD) and in vitro cell wall digestibility (IVCWD).
Genotypes significantly differed in FDM and TBDM under nonlimiting and limiting N (Tables 2 and 3).
Under limiting N, FNA and TBNA were 18 and 24%, respectively, of those under nonlimiting N, while percentages for FDM and TBDM were 38 and 65% (Tables 2 and 3).
We hypothesized that genotypes with high FDM would not necessarily have a high TBDM, and consequently, there would not be a strong relationship between FDM and TBDM.
A negative correlation between TBDM and TBNC was also illustrated by N- with a low TBDM and a high TBNC, and 1263 with a high TBDM and a low TBNC.
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