This Special Issue of Agriculture is dedicated to the effects of fertilization of different nitrogen forms and fertilizers on crop productivity in interaction with other crop nutrients, water supply, crop type and site conditions. Sustainable nitrogen management and improving nitrogen use efficiency are key in solving the global ecological crisis while maintaining sufficient food supply. Globally, nitrogen losses from agricultural systems are amongst the major pressures on managed and natural ecosystems. Synthetic and organic N fertilizers vary with respect to their effects on crop growth, crop quality and nitrogen losses. Productivity effects of nitrogen are site-, weather- and nitrogen form-specific.
The supply and availability of nitrogen, the major crop nutrient, are decisive for crop productivity.
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