The concept of critical source areas of phosphorus (P) loss produced by coinciding source
and transport factors has been studied since the mid 1990s. It is widely recognized that …

Critical source areas (CSAs) are small areas of a field, farm, or catchment that account for
most contaminant loss by having both a high contaminant availability and transport potential …

Many states have invested significant resources to identify components of their Phosphorus
(P) Index that reliably estimate the relative risk of P loss and incentivize conservation …

The P Index was proposed as a nutrient management tool in 1992 and has been
implemented as such for the past decade. However, lack of water quality improvement in …

Starting in 1971, stream flow and climatologic data have been collected in the Goodwater
Creek Experimental Watershed, which is part of the Central Mississippi River Basin (CMRB) …

Phosphorus (P) Indices in the southern United States frequently produce different
recommendations for similar conditions. We compared risk ratings from 12 southern states …

Over the past 20 yr, there has been a proliferation of phosphorus (P) site assessment tools
for nutrient management planning, particularly in the United States. The 19 papers that make …

Forty‐eight states in the United States use phosphorus (P) indices to meet the requirements
of their Natural Resources Conservation Service (NRCS) Code 590 Standard, which …

磷是植物生长必需的营养元素之一, 在农业生产中起着关键作用. 然而, 长期过量的磷肥投入导致
土壤磷素水平增加, 进而加大了土壤磷素流失风险, 造成农业非点源磷污染 …

Uneven spatial distribution of soil N in conventionally managed pastures is a function of
various biotic and abiotic factors and results in poor land use efficiency. In this study, we …