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Quantifying Morphological Stage to Predict the Nutritive Value in Sulla (Hedysarum coronarium L.)

Giorgio Borreani*,a, Pier Paolo Roggerob, Leonardo Sulasc and Maria Eugenia Valented

a Dipartimento di Agronomia, Selvicoltura e Gestione del Territorio, Università degli Studi di Torino, via L. da Vinci 44, 10095 Grugliasco (Torino), Italy
b Dipartimento di Biotecnologie Agrarie ed Ambientali, Università degli Studi di Ancona, via Brecce Bianche, 60131 Ancona, Italy
c Istituto per il Sistema Produzione Animale in Ambiente Mediterraneo, Consiglio Nazionale delle Ricerche, via E. De Nicola, 07100 Sassari, Italy
d Istituto di Scienze delle Produzioni Alimentari, Consiglio Nazionale delle Ricerche, via L. da Vinci 44, 10095 Grugliasco (Torino), Italy



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  		Fig. 1. Changes in sulla mean stage by weight (MSW) in relation to day of the year at two sites over 3 yr: (a) Ancona ‘Grimaldi’, (b) Ancona ‘Sparacia’, and (c) Sassari Grimaldi.

 


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  		Fig. 2. Changes in sulla mean stage by weight (MSW) in relation to growing degree days (GDD) at two sites over 3 yr: (a) Ancona ‘Grimaldi’, (b) Ancona ‘Sparacia’, and (c) Sassari Grimaldi.

 


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  		Fig. 3. Sulla leaf to stem ratio as a function of mean stage by weight (MSW) at two sites over 3 yr: (a) Ancona ‘Grimaldi’, (b) Ancona ‘Sparacia’, and (c) Sassari Grimaldi. Sampling was not performed at Sassari in 1996.

 


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  		Fig. 4. Sulla dry matter yield (DMY) in relation to mean stage by weight (MSW) at two sites over 3 yr: (a) Ancona ‘Grimaldi’, (b) Ancona ‘Sparacia’, and (c) Sassari Grimaldi.

 


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  		Fig. 5. Sulla crude protein concentration (CP) as a function of mean stage by weight (MSW) at two sites over 3 yr: (a) Ancona ‘Grimaldi’, (b) Ancona ‘Sparacia’, and (c) Sassari Grimaldi. Regression equations of the pooled data:

(a) CPGrimaldi 96 (g kg-1 DM) = -15.7MSW + 274 r2 = 0.94 RMSE = 9

CPGrimaldi 97 (g kg-1 DM) = -10.3MSW + 211 r2 = 0.80 RMSE = 15

CPGrimaldi 98 (g kg-1 DM) = -18.0MSW + 271 r2 = 0.73 RMSE = 20

(b) CPSparacia 96 (g kg-1 DM) = -17.9MSW + 308 r2 = 0.88 RMSE = 14

CPSparacia 97 (g kg-1 DM) = -10.5MSW + 221 r2 = 0.83 RMSE = 14

CPSparacia 98 (g kg-1 DM) = -21.8MSW + 318 r2 = 0.68 RMSE = 26

(c) CPSassari 96-98 (g kg-1 DM) = -8.57MSW + 191 r2 = 0.57 RMSE = 15

 


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  		Fig. 6. Sulla neutral detergent fiber (NDF) as a function of mean stage by weight (MSW) at two sites over 3 yr: (a) Ancona (both cultivars) and (b) Sassari. Regression equations of the pooled data:

(a) NDFAncona (g kg-1 DM) = 31.9MSW + 252 r2 = 0.83 RMSE = 38

(b) NDFSassari 96-98 (g kg-1 DM) = -5.43MSW2 + 80.1MSW + 258 r2 = 0.73 RMSE = 43

NDFSassari 97 (g kg-1 DM) = 27.3MSW + 206 r2 = 0.91 RMSE = 19

 


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  		Fig. 7. Sulla organic matter digestibility (OMD) as a function of mean stage by weight (MSW) at two sites over 3 yr: (a) Ancona (both cultivars) and (b) Sassari. Regression equations of the pooled data:

(a) OMDAncona 96-97 (g kg-1 OM) = -29.3MSW + 802 r2 = 0.86 RMSE = 31 OMDAncona 98 (g kg-1 OM) = -38.9MSW + 811 r2 = 0.82 RMSE = 34

(b) OMDSassari 96-98 (g kg-1 OM) = -36.7MSW + 746 r2 = 0.76 RMSE = 39 OMDSassari 97 (g kg-1 OM) = -41.4MSW + 876 r2 = 0.88 RMSE = 33

 




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