Yields and N uptake of barley and ryegrass from soils with added animal manure differing in straw and urine content

摘要: Abstract Four types of cattle manure were prepared by mixing faeces with different ratios urine + straw, one being without straw and urine. Following 3 to 6 months storage, the manures applied in spring or autumn a sandy loam coarse sand amounts corresponding 120 kg N ha −1 . Spring barley ( Hordeum vulgare L.) undersown perennial ryegrass Lolium perenne used as test crops. Barley was harvested at maturity wintering cut three times second year. Additional mineral form 15 N-labelled fertilizer (50 ) added all plots planting spring. Non-manured receiving only included. Faeces contained more NH 4 -N than other incorporation this gave highest dry matter yield uptake barley. When autumn, increased on loam. On sand, probably leached NO during winter. The did not affect grain total uptake. Thus these mineralize nor immobilize measurable quantities first growth period. loam, patterns indicated an availability from similar when Less taken up compared crops given only. short-term effects stored are low. For soils low such may potentially reduce crop