[Handling of straw and impact on grain yield and take-all in monoculture of barley: Preliminary results 1967-84 [Gaeumannomyces graminis, early or late ploughing, ploughing in, straw removal]]

aradura barley cebada champignon corte cutting fungi grain granos labour orge paille paja ploughing rendement rendimiento soil sol straw suelo textura texture yields