0 a chemical element that is a gas with no colour or taste, forms most of the earth's atmosphere, and is a part of all living things -- 氮（氣）
These algal mats are said to be rich in phosphates, nitrogen, organic matter, and cation-exchange capacity.
The high nutritional quality of the detrital organic matter in our study stream may result from grazing by tadpoles which enhances nitrogen fluxes.
Is the productivity of organic farms restricted by supply of available nitrogen?
Utilizing the nitrogen content of organic manures on farms-problems and practical solutions.
Decline in soil organic carbon and total nitrogen in relation to tillage, stubble management and rotation.
In addition, we recovered other embryos after storage of up to 18 months in liquid nitrogen to provide information on mutation during storage.
Optimizing time distribution of water supply and fertilizer nitrogen rates in relation to targeted wheat yield.
Real-time measures of canopy size as a basis for spatially varying nitrogen applications to winter wheat sown at different seed rates.
