Field-specific simulations of net N mineralization based on digitally available soil and weather data: II. Pedotransfer functions for the pool sizes

摘要: Avoiding surplus N fertilization without reducing crop yields could be accomplished by accounting for current net mineralization in fertilizer recommendations. simulation models would allow a quantitative consideration of important factors and based upon digitally mapped data. Soil-specific temperature water functions that were derived part I the paper needed differentiation between only three soil groups two allocating criteria taken from digital maps. Here, objectives to experimentally determine pedotransfer (PTFs) pool sizes organic pools (Nfast, Nslow) calculated via available data need minimum set easily accessible management Interestingly, most input PTFs both mean clay contents texture class (German classification system). However, underlying mechanisms might different, as Nslow positively influenced clay-associated mineralizable SOM, whereas Nfast related content due higher yield potential thus more residues on finer-textured soils. For including humus improved accuracy PTF (r² = 0.60; P < 0.050). it was include negative influence fall preceding year (r² = 0.42; P < 0.010), probably its residue degradation before winter. Surprisingly, data, e.g. previous crop, did not improve predictions this study. Field studies with plant cover will have further prove applicability PTFs.