References
References
- Frøslie , A and Norheim , G . 1983 . Copper, molybdenum, zinc and sulphur in Norwegian forages and their possible roles in chronic copper poisoning in sheep . Acta Agric. Scand. , 33 : 97 – 104 .
- Johansen C Kerridge PC Sultana A 1997 Responses of forage legumes and grasses to molybdenum In: Gupta, U. M. (ed.) Molybdenum in Agriculture, Cambridge University Press Cambridge pp. 202–228
- Johansen A Nordang LØ. Ljøkjel K 2003 Grovfôret åleine kan sjeldan gi ei god nok mineralforsyning til drøvtyggarar Grønn Kunnskap 7 103 111 (In Norwegian.)
- Marschner H 1995 Mineral nutrition of higher plants second edn Academic Press London 889 pp
- Mengel K Kirkby EA 2001 Principles of plant nutrition fifth edn Kluwer Academic Publishers Dordrecht 849 pp
- Nesheim , L and Øyen , J . 1994 . Nitrogen fixation by red clover (Trifolium pratense L.) grown in mixtures with timothy (Phleum pratense L.) at different levels of nitrogen fertilization . Acta Agric. Scand., Sect B. Soil and Plant Sci. , 44 : 28 – 34 .
- O'Hara , GW . 2001 . Nutritional constraints on root nodule bacteria affecting symbiotic nitrogen fixation: a review . Aust. J. Exp. Agric. , 41 : 417 – 433 .
- Strøm T Hansen S Govasmark E Steen A 2003 Mineralinnholdet i planter og mineralforsyninga til drøvtyggere i økologisk landbruk Grønn Kunnskap 7 122 137 (In Norwegian.)
- Synnes OM Øpstad S 1995 Innhaldet av mikro- og makronæringsstoff i gras med utgangspunkt i granskingar i dei tre nordlegaste Vestlandsfylka Faginfo Planteforsk 6 101 113 (In Norwegian.)
- Vrany , J . 1978 . Microbial changes in clover rhizosphere after foliar and soil application of cobalt . Folia Microbiol. , 23 : 236 – 242 .