Materials and Methods The Neely-Kinyon Long-term Agroecological Research (LTAR) site was established in 1998 to study the long-term effects of organic production in Iowa. Treatments at the LTAR site, replicated four times in a completely randomized design, include the following rotations: conventional corn-soybean (C-S), organic corn-soybean-oats/alfalfa (C-S-O/A), organic corn-soybean-oats/alf...

Nebraska, US, is projected to face increased winter and spring precipitation, drier summers as the climate changes over next 20 30 years. Agricultural adaptations adjustments would be critical mitigate adverse impact of change achieve global food security. Focusing on climatic projections for our objective analyze data from a long-term (31 years; 1986–2016) rainfed agriculture experiment determ...

Do extended crop rotations that include forages improve soil quality and are they profitable? Our objectives were to determine (i) how crop rotation affected soil quality indicators, (ii) if those indicator changes were reflected in soil quality index (SQI) ratings when scored and combined using the Soil Management Assessment Framework, and (iii) how SQI values compared with profitability. Soil...

An objective drought index that measures the dry and hot conditions adversely affecting crop yields is used in a regression analysis to test whether corn and soybeans have become more drought tolerant. Results indicate that corn yield losses from a drought of a given severity, whether measured in quantity terms or as a percentage of mean yield, have decreased over time. The null hypothesis that...

Poultry litter is a nutrient-dense fertilizer, but surface applications lead to nutrient losses air, soil, and water. Objectives were evaluate optimum subsurface-applied poultry bands from crop seeding distance in corn (Zea Mays L.)–soybean [Glycine max (L.) Merr.] rotation. Soil amendment treatments included planting 13, 25, 38 cm subsurface-banded litter, surface-applied inorganic nitrogen (N...

Climate change led to increased temperature and variable rainfall, which may pose great threats both agricultural productions environmental impacts. In this study, we aim explore how changing climate its extremes in the 20th 21st-century influence system water use efficiency (sWUE) of a corn-soybean cropping rotation humid sub-tropic environment, much can cover crops mitigate these Different fr...

Thirty-six multiparous dairy cows (8 fitted with ruminal cannulas) and 16 primiparous dairy cows were blocked by days in milk and parity and assigned to one of four diets containing 53% alfalfa silage [dry matter (DM) basis] plus 1) high moisture ear corn, 2) high moisture ear corn plus expeller soybean meal, 3) ground high moisture ear corn, or 4) ground high moisture ear corn plus expeller so...