Dry-matter production and nitrogen uptake in winter maize (Zea mays)-based intercropping system under different levels of nitrogen

A field experiment was carried out during winter seasons of 1992-93 and 1993-94 to study dry-matter production and nitrogen uptake in component crops in sole maize (Zea mays L.), maize + pea (Pisum sativum L.) and maize + lentil (Lens culinaris Medikus) cropping systems under 0, 50, 100, 150 and 200 kg N/ha applied to maize on row basis. Maize grown in association of legumes accumulated significantly more dry matter and nitrogen than in sole stand. The highest dry-matter production and N uptake were recorded in maize + pea cropping system. Legumes produced less dry matter when intercropped compared with their sole stand. Dry-matter production and N content of component crops exhibited an increasing trend with increasing N levels. Total N uptake increased significantly up to 150 kg N/ha in sole maize and up to 100 kg N/ha in intercropping systems.