D. B. Beegle

TL;DR: In this paper, the authors chart the development of the indexing approach, which ranks site vulnerability to P loss by accounting for source (soil test P, fertilizer, and manure management) and transport factors (erosion, runoff, leaching, and connectivity to a stream channel) and outlines modifications made among states that reflect local conditions and policy.

TL;DR: In this paper, a study was conducted to measure nutrient uptake in grain harvested in 1998 and 1999 from 23 site-years in the Mid-Atlantic region of the USA, where 10 hybrids were included in the study, but each site grew only one hybrid each year.

TL;DR: Significant gaps in knowledge are identified as many of these technologies to facilitate the incorporation of liquid manures into soil with restricted or minor soil disturbance are relatively new, and this should help target future research efforts including environmental, agronomic, and economic assessments.

TL;DR: In this paper, the authors examined the relationship between EONR and reflectance from a ground-based sensor, and considered its potential for developing sidedress N recommendations for corn using an active sensor.

TL;DR: A rigorous evaluation of P Indices is needed to determine if they are directionally and magnitudinally correct, and the use of a locally validated water quality model that has been shown to provide accurate estimates of P loss may be the most expedient option to conduct Index assessments in the short time required by the newly revised 590 Standard.