Within and between-field spatial variation in soil phosphorus in permanent grassland

摘要: Soil phosphorus (P) concentrations above certain critical thresholds are a problem in many areas leading to its transport into surface and ground waters. Site-specific nutrient applications the development of management plans for farms would help optimize applications, meet crop requirements take consideration current soil status. In Northern Ireland, high P common, whereas low potassium (K) sulphur (S) have been reported silage fields. This study used grid transect sampling measure within- between-field spatial variation Olsen-P status across 50-ha permanent grassland site production. indices ranged from Index 1 4 within single The patterns fields suggested that there was scope site-specific fertilizer with variable quantities being applied different individual has potential reduce excess some avoid deficiencies others, thereby minimizing environmental problems optimizing yield.