DIAGNOSIS OF THE DIAZOTROPHIC STATE OF ARABLE SOIL AND RECOMMENDATION FOR THE ADDITION OF NITROGEN FERTILISER

摘要

Method for diagnosing the diazotrophic state of arable soils and advocating fertilization of the current crop comprising; only one autumn survey of the mineral nitrogen content (Nm) of the soil surface by soil sampling, without having to take the entire rooting zone and / or the vadose zone for analysis; an integral index consisting of a numerical sum indicative of the incidence of post - burial time units of soil cellulosic residues (RCsol) plus, or minus, favorable, as the case may be, to a maximum of diazotrophic activity ( Nif) soil bacteria; a recommendation concerning the rationing of the previously calculated dose X (dX).and four steps;(ix) determination of the meteorology affecting the kinetics of Nm concentrations in the upper edge of the soil vadose zone by generating rainfall from monthly climatic averages,(x) followed by the milli - molarity (mM) in Nm of the soil solution over time, advantageously following burial of RCsol as a function of the number of days post - burial (jpe),(xi) quantification of the negative feedback by Nm of the diazotrophy (Nif) of the soil bacterial flora with respect to its maximum activity according to the above-mentioned mM of Nm of the soil solution, and(xii) integration over time (jpe) of the fraction of the diazotrophic activity (Nif) of the soil bacterial flora relative to its maximum when the mM of the Nm of the soil solution ‰ 0.00 .