The breakdown products of plant and animal remains, extracted in an alkaline solution, are
commonly referred to as humic substances (HS). They can be extracted from a wide variety …

Organic agriculture refers to a farming system that enhance soil fertility through maximizing
the efficient use of local resources, while foregoing the use of agrochemicals, the use of …

Variability in the activity and composition of soil microbial communities may have important
implications for the suite of microbially-derived ecosystem functions upon which agricultural …

Nitrogen is the most limiting nutrient for crop production in many of the world's agricultural
areas and its efficient use is important for the economic sustainability of cropping systems …

Consultants, farm advisors, resource conservationists, and other land managers may benefit
from decision tools that help identify the most sustainable management practices. Indices of …

Erosion rates and annual soil loss tolerance (T) values in evaluations of soil management
practices have served as focal points for soil quality (SQ) research and assessment …

This new edition of a bestseller examines plant nutrition's role as one of the most important
limiting factors that must be overcome to optimize food production. Extensively revised and …

The concept of soil health has attracted considerable attention during the past two decades,
but few studies have focused on the effects on soil health of long-term soil management in …

The availability of Haber-Bosch nitrogen (N) has permitted agricultural intensification and
increased the productive capacity of agroecosystems; however, approximately 50% of this …

Referee: Dr. William Lockeretz, Professor, School of Nutrition Science and Policy, Tufts
University, Medford, MA 12155 Given the significant increase in consumer interest in organic …