Long-term Trends in Corn Yields and Soil Carbon under Diversified Crop Rotations.

Agricultural practices such as including perennial alfalfa ( L.), winter wheat ( L.), or red clover ( L.

Modeled nitrous oxide emissions from corn fields in iowa based on county level data.

The U.S. Corn Belt area has the capacity to generate high nitrous oxide (NO) emissions due to medium to high annual precipitation, medium- to heavy-textured soils rich in organic matter, and high nitrogen (N) application rates.

Comparison of DAYCENT-simulated and measured nitrous oxide emissions from a corn field.

Accurate assessment of N(2)O emission from soil requires continuous year-round and spatially extensive monitoring or the use of simulation that accurately and precisely predict N(2)O fluxes based on climatic, soil, and agricultural system input data. DAYCENT is an ecosystem model that simulates, among other processes, N(2)O emissions from soils. The purpose of the study was to compare N(2)O fluxes predicted by the DAYCENT model to measured N(2)O fluxes from an experimental corn field in central Iowa.

Greenhouse gas emissions from two soils receiving nitrogen fertilizer and swine manure slurry.

The interactive effects of soil texture and type of N fertility (i.e., manure vs.

Clinical investigations into the effects of practolol in angina pectoris.

The value of practolol in the treatment of angina pectoris was studied in three groups of patients by means of different methods. In 23 patients the effect of the drug was evaluated during long-term treatment and in 10 patients in a controlled double-blind trial; in 20 patients, the working capacity was determined by an ECG exercise test on a bicycle ergometer. Long-term treatment revealed advantageous effects of practolol on the incidence of anginal attacks and the number of nitroglycerin tablets consumed in daily life.

Plasma catecholamines and renin activity in response to exercise in patients with essential hypertension.

1. The effect of physical exercise on blood pressure, plasma catecholamines and plasma renin activity was studied in fourteen patients with essential hypertension and in eight healthy subjects. 2.