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Modeling Net Herbage Accumulation of an Orchardgrass Sward

INRA Agronomie, Chemin de Borde Rouge, BP27, 31326 Castanet Tolosan, France

View larger version (35K): [in a new window]   Fig. 1. Herbage accumulation for the four growing seasons and the four treatments; vertical bars indicate standard error of 1.

View larger version (19K): [in a new window]   Fig. 2. Leaf area index (LAI) plotted against accumulated degree-days for treatments with severe defoliation and N application or nil for summer regrowths and spring regrowths; vertical bars indicate standard error of 1.

View larger version (19K): [in a new window]   Fig. 3. Stem length of reproductive tillers (dotted line) and lamina length on an average tiller (continuous line) over the studied period (degree-days from 1 February) in 1995 and 1996 for treatments with severe defoliation with N application or nil; vertical bars indicate standard error of 1.

View larger version (30K): [in a new window]   Fig. 4. Herbage accumulation related to accumulated photosynthetic active radiation (PAR) intercepted for the four growing seasons and the four treatments before (continuous line) or after (dotted line) stem elongation; vertical bars indicate standard error of 1.

View larger version (17K): [in a new window]   Fig. 5. Radiation use efficiency (RUE) related to herbage N index (Ni) over vegetative phase for lenient defoliation (continuous line; RUE = 0.0210Ni - 0.48, r2 = 0.89, SE = 0.11) and for severe defoliation (dotted line; RUE = 0.0190Ni, r2 = 0.94, SE = 0.11). Pooling the data of both defoliation regimes, we found RUE = 0.0195Ni - 0.0018 x residual herbage mass, r2 = 0.94, SE = 0.12.

View larger version (41K): [in a new window]   Fig. 6. Simulated (Y) and measured (X) (i) herbage dry matter at the Toulouse site for orchardgrass spring growth (Y = 0.87X + 31.4, r2 = 0.93, SE = 35.6) and summer growth (Y = 0.86X + 2.6, r2 = 0.97, SE = 29.4), (ii) herbage dry matter at the Pyrenees site for permanent grasslands (Y = 0.56X + 176, r2 = 0.52, SE = 79.5), and (iii) net herbage accumulation between post- and pregrazing times in the Segala site over the reproductive and vegetative phases (Y = 0.66X + 40.8, r2 = 0.57, SE = 40.0). Dotted line: Y = X.