Titlebook: Gaseous Loss of Nitrogen from Plant-Soil Systems; J. R. Freney,J. R. Simpson Book 1983 Springer Science+Business Media Dordrecht 1983 evol

recede

Extricate

Fate of fertilizer nitrogen applied to wetland rice,lizer N production has increased from 3.6 × 10. t in 1970 to an estimated 18 × 10. t in 1982/83, of which 85% will be urea (Stangel 1979). Expanded use of N fertilizer is being combined with fertilizer-responsive rice varieties and increased areas under irrigation in an all-out effort to produce eno

背叛者

The fate of nitrogen compounds in the atmosphere, passive role, acting only as a medium for transport, e.g. for ammonia (NH.) release and uptake, whereas in other cases one or more chemical transformations take place in the atmosphere before each cycling N atom returns to a terrestrial ecosystem.

Chronic

muster

Volatilization of ammonia, situations from less concentrated sources, e.g. in fields and forests (Lemon and Van Houtte 1980). It is constantly being formed in soils at rates which depend on the level of microbial activity and the susceptibility of organic N compounds to biological attack. It is also being added to soils in increasing amounts as fertilizer.

Junction

墙壁

Ammonia loss from fertilizer applied to tropical pastures,t their relative importance is less clear. Nitrogen can be lost in surface runoff water, in subsurface vertical and lateral water transport, and as the gases dinitrogen (N.), ammonia (NH.), nitric oxide (NO), nitrogen dioxide (NO.), nitrous oxide (N.O), and various amines.

MAIM

FLAG

The Physiology of Arsenic in Rice,gas at the soil or water surface is calculated from changes in gas concentration in an enclosure placed over the surface; and micrometeorological techniques in which the vertical flux density of the gas is measured in the free air above the surface.

太空

Arsenic in Latin America: Part I,ugh food for the vast Asian population. Unfortunately, N fertilizer, which is already a costly input for the rice farmer, is becoming more expensive in response to the rising cost of the oilbased feedstocks used in fertilizer production. It is therefore imperative that N fertilizer is used efficiently.