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A 3-year experiment was carried out in Mediterranean conditions on two maize–barley rotations to determine the effect of different levels and sources of nitrogen (N) fertilizer on the N uptake, efficiency, soil N deficit and crops yield. The potential for N savings by the use of N indicators was also studied.Five strategies of maize N fertilization were compared on plots laid out in a complete randomized...
The N uptake by crops, soil distribution and recovery of 15N labelled urea-N (100 kg N ha-1) were investigated in a sorghum-wheat rotation in two silty clay soils (Foggia and Rieti Casabianca) and one silt loam soil (Rieti Piedifiume) under different mediterranean conditions. Non-exchangeable labelled NH4-N represented an important pool at both Rieti sites with higher values (p<0.05) under sorghum...
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