Gaseous Nitrogen Losses and Range Fertilization

Aqueous And Gaseous Nitrogen Losses Induced By Fertilizer Application

Isotopic evidence for large gaseous nitrogen losses from tropical rainforests.

The nitrogen isotopic composition (15N/14N) of forested ecosystems varies systematically worldwide. In tropical forests, which are elevated in 15N relative to temperate biomes, a decrease in ecosystem 15N/14N with increasing rainfall has been reported. This trend is seen in a set of well characterized Hawaiian rainforests, across which we have measured the 15N/14N of inputs and hydrologic losse...

Gaseous nitrogen and carbon losses from pig manure derived from different diets.

Manipulation of the diets of pigs may alter the composition of the manure and thereby the environmental and agricultural qualities of the manure. Laboratory studies were performed to quantify the effect of manipulation of pig diets on the chemical composition of the derived manure (slurry), the potential emission of methane (CH4) and ammonia (NH3) during anaerobic storage of the manure, and the...

Gaseous Losses of Nitrogen from Green Plants. Ii. Studies with Excised Leaves in Nutrient Media.

In the previous paper (1) of this series, studies to determine whether gaseous losses of nitrogen occur from cultures of Chlorella and Lemna when grown on various sources of nitrogen, showed that no losses occurred except for one minor exception. In this one case slight losses of nitrogen from Chlorella cultures, grown on ammonium nitrate, did occur. The significance of this finding is somewhat...

Influence of Overwatering and Fertilization on Nitrogen Losses from Home Lawns

Fertilized home lawns represent a potential source of NO,-N contamination to groundwater and surface waters. The waterborne losses of inorganic N from Kentucky bluegrass (Poa pratensis L.) turf subjected to three levels of N fertilization (0, 97, and 244 kg N ha"' yr~' as urea and methylene urea) and two irrigation regimes (scheduled by tensiometer and overwatering with 3.75 cm of water per wee...