Simple soil carbon model for use in the HighCrop decision model

The soil carbon turnover model used in the HighCrop decision support model is described

Hvordan kan udvaskningen og belastningen af vandmiljøet yderligere reduceres?

Kvælstofudvaskningen bestemmes i højere grad af afgrødedække om efteråret end af hvor meget gødning, der gives

Kvælstofforsyningen på økologiske planteavlsbedrifter

Med udfasning af import af konventionel husdyrgødning bliver det nødvendigt med et større fokus på kvælstoffikserende afgrøder i økologiske planteavlssædskifter

The role of catch crops in the ecological intensification of spring cereals in organic farming under Nordic climate

The contribution of catch crops to the ecological intensification of organic arable systems was investigated using data of a 12-year field experiment carried out at three sites in Denmark. This study focused on the yields of spring oats and spring barley in systems with and without manure in two different cropping systems that differed in the proportion of legume-based catch crops (O2 lower and O4 higher) and in the rotation composition (grass-clover green manure in O2 and pulse crops in O4). Three consecutive four-year crop rotations were established at three locations representative of the different soil types (loamy sand, sandy loam and coarse sand) and climatic conditions. Crop management and soil operations were performed following common practices in organic farming. Measurements of dry matter (DM) and nitrogen (N) content of grain cereals at harvest, aboveground biomass in catch crops and green manure crops in autumn and of the green manure crop at the first cutting were performed. The effect of catch crops on grain yield varied with cereal and catch crop species, soil and rotation type, and the application of N in manure. Higher yield increases from previous catch crops were obtained for spring oat than for spring barley with mean estimates of the apparent N recovery efficiency of 69% and 46%, respectively. However, lower autumn N in undersown crops with higher cash crop yields was also observed. For spring oats mean grain yield benefits of including catch crops varied from 0.2 to 2.4 Mg DM ha-1 31 depending on location, manure use and course of the rotation. In spring barley mean grain yield benefits from catch crops varied from 0.1 an 1.5 Mg DM ha-132 . There was a tendency for the effect of catch crop on grain yield to increase over time. These results indicate that in Nordic climates catch crops can contribute to the ecological intensification of spring cereals, not only by reducing the nitrate leaching and increasing N retention, but also by improving yields. Management practices in relation to catch crops must be adapted to the specific soil and cropping systems

Højere udbytter ved rækkedyrkning og efterafgrøder - RowCrop

Den største udfordring for at opnå højere og mere stabile udbytter i økologisk planteavl er knyttet til tilstrækkelig N-forsyning og bekæmpelse af aggressivt ukrudt. RowCrop udviklede, evaluerede og demonstrerede et nyt rækkedyrkningssystem, der udnytter den seneste udvikling inden for vision og GPS-styrede rækkedyrkningsudstyr ved effektivt at integrere traditionelle landbrugsafgrøder med rækkedyrkning af efterafgrøder og målrettet ukrudtsbekæmpelse. RowCrop udviklede det videnskabelige grundlag for forbedret kontrol af aggressive en- og flerårige ukrudtsarter i et rækkedyrkningssystem og for dyrkning af mere produktive N-fikserende efterafgrøder til øget N-forsyning af afgrøderne. Projektet skulle dokumentere effekter af dyrkningssystemet på produktivitet, ukrudtsbestand, N-forsyning, N-udvaskning og kulstoflagring i et langvarigt sædskifteforsøg ved forskellige inputniveauer i økologisk planteavl. Projektet demonstrerede og formidlede desuden resultaterne til rådgivere og landmænd gennem markforsøg, åbent hus-arrangementer, workshops mv. De forventede årlige effekter var: Økonomi: Øgede udbytter i økologisk kornavl på 1,2 ton/ha (100 mio. DKK). Miljø: Reduceret nitratudvaskning på 10 kg N/ha (500 ton N). Klima: Øget kulstoflagring i jorden på 200 kg C/ha (37,000 ton CO2). Desuden forventedes resultaterne at bane vej for udfasning af import af konventionel husdyrgødning i økologisk jordbrug og for en øget omlægning fra konventionel til økologisk jordbrug

Organisk gødning udnyttes for dårligt

Der er stor variation i udnyttelsen af organisk gødning, men efterafgrøder og grøngødning har flere roller i sædskiftet

Research for AGRI Committee : preserving agricultural soils in the EU - Study

This study explains how threats to soils and soil services are linked to agricultural soil management, how threats can be mitigated, and which barriers complicate this. It highlights trade-offs and synergies that exist between different interests affected by soil management, such as climate change mitigation, water and air quality, biodiversity, food security and farm income. Conservation of peatland and extensive agro-forestry systems, and protecting soils against sealing, erosion and compaction are ranked as highest priorities. Potential policy elements are suggested