A soil test for nitrogen availability in the northeastern United States
Magdoff, F.R. (University of Vermont, Burlington, VT) ; Jokela, W.E ; Fox, R.H ; Griffin, G.F
Communications in soil science and plant analysis, 1990-08, Vol.21 (13/16), p.1103-1115 [Periódico revisado por pares]Taylor & Francis Group
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