Environmental Studies

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Organisms which use carbon dioxide or carbonates for their carbon source and either sunlight or ... Started by Lobcity	3 Replies 74 Views	Jul 22, 2018 by ladyjames123
In most soils the overall population (numbers) of microorganisms changes with time, generally ... Started by nramada	1 Replies 93 Views	Jul 22, 2018 by Sassygurl126
Disease suppressive soil often results from ________. A) adding organic materials to the soil ... Started by maychende	1 Replies 280 Views	Jul 22, 2018 by rnehls
Where conditions are favorable, earthworms are known to add several hundred kg/ha of several ... Started by ENagel	1 Replies 47 Views	Jul 22, 2018 by Jbrasil
Algae are single-celled plants that function principally as primary producers in the soil ecosystem. ... Started by dbose	1 Replies 73 Views	Jul 22, 2018 by dantucker
All but a few nematodes are pests, attacking either economic or wild plants. Indicate whether the ... Started by fnuegbu	1 Replies 56 Views	Jul 22, 2018 by cswans24
Plant roots are an important source of carbon for many soil organisms which are beneficial to ... Started by melina_rosy	1 Replies 49 Views	Jul 22, 2018 by lorealeza
The great majority of nitrogen (95 to 98) in soils can be found in the form of ________. A) ... Started by Arii_bell	1 Replies 30 Views	Jul 22, 2018 by alexisweber49
Of all the groups of soil organisms, bacteria have the most diverse metabolic capabilities. ... Started by lb_gilbert	3 Replies 16 Views	Jul 22, 2018 by ong527
Which of the following is (are) major sources of the carbon dioxide now being added to the ... Started by jake	1 Replies 24 Views	Jul 22, 2018 by mjbamaung
Green plant residues such as grass clippings or a green manure crop generally have a water content ... Started by savannahhooper	1 Replies 96 Views	Jul 22, 2018 by sarah_brady415
Humic substances consist of ________. A) dead plant & animal tissues B) living organisms and ... Started by skymedlock	1 Replies 59 Views	Jul 22, 2018 by joneynes
Detritus consists of ________. A) dead tissues and wastes B) polymerized, non-identifiable ... Started by jlmhmf	1 Replies 36 Views	Jul 22, 2018 by abro1885
Alcohols, methane and organic acids of various kinds often accumulate as a result of ________ ... Started by fahad	1 Replies 26 Views	Jul 22, 2018 by Swizqar
As decomposition of added organic material proceeds, the C/N ratio in the remaining undecomposed ... Started by LaDunn	1 Replies 32 Views	Jul 22, 2018 by amynguyen1221
Fulvic acids are a major type of non-humic substances. Indicate whether the statement is true or ... Started by tiffannnnyyyyyy	1 Replies 12 Views	Jul 22, 2018 by beccamahon
Nitrogen is a component of which essential plant compounds? A) chlorophyll B) DNA C) enzymes ... Started by tnt_battle	3 Replies 50 Views	Jul 22, 2018 by jojobee318
Assume an A horizon depth of 15 cm. A well drained silt loam soil on an Iowa farm has 3.5 organic ... Started by Pea0909berry	1 Replies 49 Views	Jul 22, 2018 by Eunice618
The sulfur dioxide in the atmosphere ________. A) can be an important source of sulfur nutrition ... Started by jman1234	1 Replies 67 Views	Jul 22, 2018 by aliotak
Because of ________, soils developed in marine marshes can become extremely acid if drained for ... Started by notis	1 Replies 80 Views	Jul 22, 2018 by TINA
Compared to the same soil used for cropland, a forested soil would be expected to lose ________ ... Started by torybrooks	1 Replies 258 Views	Jul 22, 2018 by Andromeda18
Mycorrhizae improve the nutrition of many plants by ________. A) masking P-fixation sites on the ... Started by michelleunicorn	1 Replies 126 Views	Jul 22, 2018 by pocatato
If a manager can afford only a limited amount of soluble P fertilizer for a calcareous soil with low ... Started by Marty	1 Replies 233 Views	Jul 22, 2018 by Moriaki
The sites in certain clay minerals which fix potassium ions are also capable of fixing which other ... Started by Beheh	1 Replies 45 Views	Jul 22, 2018 by poopface
The total phosphorus lost from various watersheds is most closely correlated with ________. A) ... Started by nummyann	3 Replies 13 Views	Jul 22, 2018 by leannegxo