Winter wheat at lower input levels: selected implications for agronomy and breeding [6 manuscripts included]

agricultura de bajo insumo agriculture faible niveau intrants agronomic characters azote cultivation cultivo cultivos de invierno cultivos de primavera culture d'hiver culture de printemps danemark denmark dinamarca fitomejoramiento hordeum vulgare low input agriculture malezas mauvaise herbe nitrogen plant breeding plant competition pratique culturale rendement rendimiento spring crops temperatura temperature triticum aestivum weeds winter crops yields