Effect of legumes on soil mineral nitrogen and response of potatoes to nitrogen fertilizer J.J. Neeteson text Ind In : J.Vos, C.D. van Loon and G.J. Bollen (eds), effect of crop rotation on potato production in the temparate zones Dordrecht etc, Kluwer (1989):pp.89-93 In : J.Vos, C.D. van Loon and G.J. Bollen (eds), effect of crop rotation on potato production in the temparate zones Dordrecht etc, Kluwer (1989):pp.89-93 MINERAL SOILS FERTILIZERS SOLANUM TUBEROSUM