Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Human Impact on Nitrogen Cycle
Human activities are profoundly affecting the cycling of nitrogen in nature. Over 30 x 106 metric tons/yr. of N2 is fixed in the commercial production of fertilisers, an amount almost equal to that fixed biologically. The use of N2 fertilisers affect the distribution of N2 on earth. Much of the nitrogen in the harvested crops becomes animal and human waste in sewage waters and eventually enters the aquatic ecosystem through runoff and leaching. Nitrogenous compounds leached into the groundwater may be abundant in irrigation and drinking water where they can cause serious health hazards. Nitrogenous compounds entering the lakes have fertilising effect resulting in algal blooms and promote cultural eutrophication.
Excessive growth of phytoplankton in eutrophic lakes produces huge quantities of biomass and finally collapse due to nutrient exhaustion. The dead organisms are consumed by detrivores which use up the oxygen supply. This problem of cultural eutrophication is, however, more severe in the case of phosphorus additions rather than nitrogen. When fossil fuels are burned we add nitrogenous compounds to the air. Large quantities of nitrogen oxide (NO) are released from vehicles and most of the NU is converted to NO2 by combining with ozone (O3) in the atmosphere. NO2 is a toxic gas for 6umans and a cause of smog. It combines with water to form nitric acid, HNO3, which forms 30% of the strong acids in the acid rain.
Which of the following terms best describes calcium metals? Check all that apply. Molecule, element, matter, and compound
Why is carbon monoxide toxic for humans? Hemoglobin "likes" carbon monoxide (CO) much more than it likes oxygen. When there is carbon monoxide in the inhaled air it binds to he
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Hypertensive emergencies are one of the important categories of hypertension and characterized by severe elevations in BP that are complicated by evidence of progressive target org
Q. What event marks the beginning of the menstrual cycle? What is the blood concentration of FSH, LH, estrogen and progesterone in this phase of the cycle? By convention the me
XYY humans are fertile males. XXX humans are fertile females. What do these observations reveal about the mechanisms of sex determination and dosage compensation?
Q. What are the bacteria? Bacteria are unicellular and prokaryotic beings. Bacteria have simple organization they present an exterior cell wall, plasma membrane, circular DNA w
Evolution of migration Eg Benefits associated with migratory flights must be greater than those associated with staying in Alaska and having to tolerate seasonal changes
Explain Atrial Switch Operation ? The hospital mortality reported varies between 0 and 15 per cent. Late survival is worse for TGA with VSD compared to simple TGA. 15 year surv
State the Layers of retina The retina is coil~posed of ten layers: a) Pigmented epithelium (outermost layer), b) Neusoepithelium, rods and cones (photoreceptors), c) Exte
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd