Increased adoption of no‐till systems in the Northern Plains has led to an increased volume
of post‐harvest crop residue. A cool climate coupled with short growing seasons benefits …

Crop N needs are not usually predicted based on cropping intensity or on tillage practice.
However, N fertilizer requirements may increase dramatically as less fallow and less tillage …

Farmers and their advisors are becoming increasingly aware of the interconnections
between the use of nitrogen (N) in agriculture and ground water quality. Farmers face a …

Minimizing N pollution from nonpoint agricultural sources is a management challenge in US
agriculture and in the Chesapeake Bay watershed. This 2‐yr field study examined the …

Management systems which maintain crop residues on the soil surface have prompted a
need for more detailed information regarding crop residue N availability. Such information is …

In the mid-Atlantic USA region, nitrogen uptake by crops ceases about four weeks prior to
harvest maturity, leaving substantial mineral N in the soil profile, which is prone to leach …

Tillage management is an important regulator of organic matter decomposition and N
mineralization in agroecosystems. Tillage has resulted in the loss of considerable organic N …

Crop residues have become an increasingly important renewable natural resource. They
can serve to maintain optimum crop production on the nation's severely eroding 45.3 million …

This chapter provides an overview of the use of conservation tillage in the USA, reviews
plant nutrient sources (ie, fertilizer, organic residues, and symbiotic N2 fixation), and …

Crop residues improve soil productivity and crop production by maintaining large soil
organic matter contents and increasing nutrient retention. On poorly drained soils or in cool …