Legumes are one of the major nitrogen sources in arable organic farms. Often the aboveground mass of perennial legume is used for green manure. The study was aimed to explore the aboveground mass of perennial legumes and their mixtures with festulolium, used as mulch, to estimate soil mineral N variation under organic cropping conditions. The perennial legumes (Trifolium pratense L., Medicago sativa L.) and their mixtures with festulolium (x Festuliolium) and their aboveground mass management methods: removed from the field (cut twice for forage), mixed management (the first cut – removed from the field, the second and third cuts – mulched), mulching (4 times) in organic arable farming system were applied. After ploughing up of mulches, the dynamics of soil mineral nitrogen content depended on the incorporated carbon and nitrogen of mulch, its C/N and meteorological conditions during the whole vegetation period. The compatibility of nitrogen release from incorporated organic matter and cereal nitrogen demand was established not every years. The amount of soil mineral N in the autumn can be controlled by growing mixtures of legumes and festulolium and by incorporating a limited amount of mulch into the soil.
- Bhowmik A., A.M. Fortuna, L. Cihacek, A. et al. Use of biological indicators of soil health to estimate reactive nitrogen dynamics in long-term organic vegetable and pasture systems.- Soil Biology and Biochemistry, 103, 2016, 308-319.
- Carter M.S., P. Sorensen, S.O. Petersen, et al., Effects of green manure storage and incorporation methods on nitrogen release and N2O emissions after soil application. - Biology and Fertility of Soils, 50 (8), 2014, 1233-1246.
- Cherr C.M., J.M.S Scholberg, R. MeSorley, Green manure approaches to crop production: A synthesis. - Agronomy Journal American society of agronomy. 98, 2006, 302-319.
- Darnhofer I., T. Lindenthal, R. Bartel-Kratochvil et al. Conventionalisation of organic farming practices: from structural criteria towards an assessment based on organic principles. A review. - Agronomy for Sustainable Development 30 (1), 2010, 67–81.
- Jensen E. S., L. Bedoussac, G. Carlsson, et al. Enhancing yields in organic crop production by eco-functional intensification. - Sustainable Agriculture Research, 4(3), 2015, 42-50.
- Moyo H., W.P. Davies, N.D. Cannon, et al. Influences of two-year clover-grass ley management on nitrogen economy and following wheat performance. - Biological Agriculture and Horticulture, 32 (2), 2016, 98-109.
- Niggli U. Incorporating Agroecology into Organic an ongoing challenge. - Sustainable Agriculture Research, 4(3), 2015, 149-157.
- Opheusden A.H.M., G.J.H.M. Burgt, P.I. Rietberg. Decomposition rate of organic fertilizers: effect on yield, nitrogen availability aand nitrogen stock in the soil. 2012, Rietberg, 40s.
- Peoples M.B., J. Rockwell, D.F. Herridge. The contributions of nitrogen-fixing crop legumes to the productivity of agricultural systems. - Symbiosis, 48, 2009, 1-17.
- Pinder R.W., N.D. Bettez, G.B. Bonan, et al. Davidson Impacts of human alteration of the nitrogen cycle in the US on radiative forcing. – Biogeochemistry, 114 (1-3), 2012, 25-40.
- Raudonius S. Application of statistics in plant and crop research: important issues. - Zemdirbyste-Agriculture, 104 (4), 2017, 377-382.
- Tripolskaja L., G. Šidlauskas G. The influence of catch crops for green manure and straw on the infiltration of atmospheric precipitation and nitrogen leaching. - Ţemdirbystė-Agriculture, 97 (1), 2010, 83-92.