Humans are currently confronted by many global challenges. These include achieving food
security for a rapidly expanding population, lowering the risk of climate change by reducing …

Agricultural systems are nitrogen (N) deficient throughout the world and N is the most
important nutrient in realizing the maximum potential of the crop and sustainability of the …

Although integrated crop–livestock systems have been employed globally for millennia, in
the past century, farmers in North America have tended toward increased specialization …

Cultivated forage crops are grown on almost 12 million ha on the northern Great Plains. This
paper reviews the benefits of diversifying annual crop rotations with forage crops and …

Intermediate wheatgrass (Thinopyrum intermedium; IWG) is a perennial cereal crop
undergoing development for grain production; however, grain yield declines of> 75% are …

Cover crops and cropping systems' effects on N and related aspects of crop production and
environmental quality have been reviewed by many authors (Russelle and Hargrove, 1989; …

Climate change is one of the main global issues of modern time. Ever increasing demand for
food/feed and the need for higher environmental standards require shaping of the …

Nitrogen (N) budgets can be used to quantify the flows of N in agroecosystems and to
account for differences in losses and retention of N. The objective of our study was to …

Alfalfa (Medicago sativa) is an important forage crop worldwide. Apart from cultivated fields,
alfalfa is also found along roadsides and in natural and semi-natural habitats. However, little …

Most N2‐fixing prokaryotes are free‐living organisms or grow in association with various
plant or fungal species, but some have evolved to form symbioses with the relatively small …