na INLIS000000000002750 Ind 0010-1118002750 Quantitative root ecology as element of soil fertility theory NOORDWIJK, M.van M. van Noordwijk and P. de Willigen. Br.631.45NOOq Repr. from : Neth. Journ. Agric. Sci., 34, 1986: p.273-281 631.45 ROOTS SOIL FERTILITY 0804/MS/87