Sådan etableres efterafgrøder ved radrensning

Efterafgrøder i økologisk produktion etableres normalt undersået i foråret eller efter høst af hovedafgrøden. Men den øgede udbredelse af radrensere giver mulighed for at etablere efterafgrøderne efter endt ukrudtsbekæmpelse i maj eller juni måned

Grønne afgrøder

I dæksæd og udlæg eer der samlet høstet ddet største proteinudbytte i grønkorn med udlæg af kløvergræs på 10,9 hkg råprotein pr. ha

Vårsæd dyrkning

Som gennemsnit af fem marker er der 3,1 hkg pr. ha i merudbytte for radrensning i vårsæd og 4,3 hkg pr. ha, når der både er radrenset og luget i kornrækkerne. Radrensning giver merudbytte i vårsæd, når der er et stort udbyttepotentiale i marken

Alternative jordbearbejdningsmetoder i kartofler

Opsætning af kamme om efteråret har øget mængden af plantetilgængeligt kvælstof om foråret

Integration of Elymus repens control and post-harvest catch crop growing in organic cropping systems

In Northern Europe, Elymus repens (L.) Gould infestations are traditionally controlled by repeated stubble cultivation in the period from harvest to ploughing in autumn. However, in organic farming, post-harvest tillage is undesirable due to the need for retaining nutrients in the cropping system. The soil is mostly cropped in that period, limiting post-harvest tillage. Two control strategies against E. repens are presented that merge the objectives of achieving a significant reduction of E. repens while having the soil covered with plants during the post-harvest period. Strategy I is an integration of rhizome fragmentation by soil cultivation within two days after harvest in early August with subsequent sowing of a catch crop to suppress shoot growth from the rhizome fragments. Strategy II also includes growing a catch crop but is preceded by a mid-summer fallow period lasting 4-6 weeks where repeated soil cultivations are conducted to fragment, weaken and desiccate the rhizomes. Strategy II controlled 91-90% of the E. repens population while strategy I only controlled up to 40%, mainly because of the weakening and desiccation of rhizomes caused by repeated cultivations. However, the fallow period may lead to undesirable nutrient leaching from sandy soils and the grower will have to desist from growing a profitable maturing crop, aspects that should be counterbalanced against the urgency for E. repens control and other possible control options. Strategy I appears to be more relevant for low infestation levels of E. repens while strategy II would be more appropriate where infestations have become large

Radrensning giver merudbytte i vårsæd

Radrensning i afgrøder sået på øget rækkeafstand kan være et godt supplement i ukrudtskontrollen. Især når det kombineres med et godt sædskifte, godt etablerede og konkurrencestærke afgrøder samt blindstrigling

Vurdering af udbytteniveau i økologisk kløver og kløvergræs

Gennem en analyse af kløvergræsforsøg i danske landsforsøg for perioden 1992 til 2017 er der fundet følgende gennemsnitsværdier for udbytter i økologisk kløvergræs: Grøntmasse: 40 - 65 tons / ha Tørstof: 9,5 - 10, 7 tons / ha Foderenheder: 6.600 - 8.980 FE / ha Råprotein: 1,36 - 2,03 tons / ha I rødkløver: Tørstof: 12,3 - 16,1 tons / ha Råprotein: 2,04 - 3,38 tons / h

Biogas fra energiafgrøder giver bedre sædskifter og højere udbytter

Produktion af biogas og biogasgylle ud fra økologiske energiafgrøder giver økonomisk grundlag for bedre sædskifter, større næringsstoftilførsel og dermed højere dyrkningssikkerhed. Desuden giver det en række miljømæssige fordele

Cultivation in rows – Weed control in spring cereal grains

By increasing the row spacing from 12.5 cm to 25 cm in your spring cereal grains it will be possible to both carry out weed control and simultaneously establish a nitrogen-fixing catch crop between the grain rows. As long as the number of plants is maintained when increasing the row spacing and crop damage is avoided, a row spacing up to 30 cm will not result in yield loss. Weed control between the rows results in more than 75% reduction in number of weeds, although aggressive species were reduced less. Weed control between the catch crop rows after harvest reduces perennial weeds

Cultivation in rows – Nitrogen fixation by catch crops and their effect on yield

Row cultivation in cereals with nitrogen-fixing crops can improve nitrogen supply in the crop rotation, while reducing nitrogen leaching. Well-established and competitive catch crops are important, they can both supply a significant amount of nitrogen to the subsequent crops and compete against the weeds. There needs to be a balance between main and catch crops – competitive main crops require early establishment of the catch crop and/or larger row distance. In a less competitive main crop, row distance can be narrower and the catch crops should be sown later. Early harvest is important to get a competitive catch crop. Well established catch crops can increase the yield of the succeeding crop, corresponding to up to 50 kg nitrogen per hectare. Well established catch crops – including nitrogen fixing species – reduce nitrogen leaching by up to 20 kg N per hectare