Growth dynamics and agronomic-economic benefits of pea–oat and pea–barley intercrops
Christos A. Dordas A D , Dimitrios N. Vlachostergios B and Anastasios S. Lithourgidis CA Labaratory of Agronomy, Faculty of Agriculture, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
B National Agricultural Research Foundation (N.AG.RE.F.), Fodder Crops and Pastures Institute, 413 35 Larissa, Greece.
C Department of Agronomy, Aristotle University Farm of Thessaloniki, 570 01 Thermi, Greece.
D Corresponding author. Email: chdordas@agro.auth.gr
Crop and Pasture Science 63(1) 45-52 https://doi.org/10.1071/CP11181
Submitted: 15 July 2011 Accepted: 3 February 2012 Published: 7 March 2012
Abstract
Pea (Pisum arvense L.) is an important legume in many areas of the world, which is used for forage and grain production and could be used in intercropping systems. Intercropping of pea with oat (Avena sativa L.) and barley (Hordeum vulgare L.), in two seeding ratios 60 : 40 and 80 : 20, was compared with pea and two cereal monocrops for two growing seasons (2008–10), at the Aristotle University of Thessaloniki, Greece. The effect of the intercropping systems was determined on growth rate, plant height, chlorophyll content, DM, and N yield. Also, several competition and economic indices were used to evaluate the intercropping systems, such as land equivalent ratio (LER), relative crowding coefficient (K), aggressivity (A), competitive ratio (CR), actual yield loss (AYL), system productivity index (SPI), monetary advantage index (MAI), and intercropping advantage (IA). Growth rate of pea and cereals was lower by an average of 39 and 64%, respectively, in the intercrops than in the monocrops. DM yield was the highest in barley monocrop (13.00 Mg ha–1) followed by P80O20 intercrop (11.73 Mg ha–1). Pea monocrop, and P80O20 and P80B20 intercrops showed the highest crude protein (CP) concentration (137, 132 and 130 g kg–1 DM, respectively), whereas P80O20 intercrop also produced the highest CP yield (1552 kg ha–1). The LER, K, and AYL values (average 1.09, 1.75 and 0.29, respectively), were greater for both pea-oat intercrops compared with the pea-barley intercrops (average 0.98, 0.92 and 0.06, respectively), indicating that in these systems there was an advantage of intercropping for exploiting the resources of the environment. The A, CR, and partial AYL values in all intercrops were greater for oat and barley than pea, which indicated that cereals were more competitive partners than pea. The highest MAI, IA, and SPI values were recorded for P80O20 followed by P60O40 intercrops indicating that these intercropping systems were the most profitable. The results from this study showed that both pea-oat intercrops were more productive with high CP yield, and also they showed the best land-use efficiency.
Additional keywords: aggressivity, competition, forage, intercropping advantage, LER, monetary advantage.
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