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The relative humidity in pore spaces is high in soils in tropical areas but low in desert soils. TRUE ORFALSE
The tropics are warm all year, averaging 25 to 28 degrees Celsius. Desert surfaces receive a little more than twice the solar radiation received by humid regions.
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- The relative humidity in pore spaces is high in soils in tropical areas but low in desert soils. True or false.The air in soils is normally higher in CO2 and lower in O2 than atmospheric air. TRUE OR FALSEContinuous movement of elements and compounds that make up nutrients through air, water, soil, rock, and living organisms.
- Soil organic matter (SOM) samples have charge that is pH-dependent, and measurements for the cation-exchange capacities (CECS) of soil organic matter average around 150 cmol(+)/kg SOM at neutral pH. Meanwhile, smectite clay minerals have CECS that average approximately 100 cmol(+)/kg clay. Since these two phases are the dominant contributors to soil CEC, we can use SOM content and smectite content (if we can measure it) to estimate total soil CEC. What would be your estimate for the total CEC (in cmol(+)/kg soil, to the nearest 0.1 cmol(+)/kg soil) of a soil that contained 3.28 % SOM and 1.0 % smectite clay by weight?%OM pH EC Ca2+ Mg2+ K+ Na+ Al3+ H+ % dS/m cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil 2.7% 7.6 4.5 19 13 10 3 1 4 Is this soil affected? If so, what type? - saline - sodic - not salt affected - saline-sodicImagine you are testing water samples from a local pond for pollutants. Your lab instructor sees the results of your dissolved oxygen test and remarks that your water sample has the same dissolved oxygen level as water found near the seafloor of a dead zone. What is the dissolved oxygen level of this water sample? 650-700 ppm 350-360 ppm 80-90 ppm 7-9 ppm 2-3 ppm
- Plants absorb several ions and water from soil. For this reason, it is necessary for the soil to have a pH value at the range of 6.0 – 8.0. Again, if the p4 is less than 3.0 or greater than 10, then the beneficial microbes of the soil die. Normally rainwater is slightly acidic, its p# value is 5.5. During thunderstorm nitrogen and oxygen of air react to form nitric oxide, which is oxidized to form nitrogen-dioxide. This nitrogen-dioxide reacts with water vapor and forms nitrous acid and nitric acid. Acid-rain occurs because of it. 2NO2+ H2O → HNO2+HNO3 Examination of soil in a region of Rajshahi revealed that its p" value was 6.43. Nitrogen-dioxide is formed in the air because of thunderstorms, and its concentration is 0.297 ppm. What will be the difference between the p" value of the soil after rain and the lowest standard pH value ?Soil pH influence the availability of soil nutrient elements TRUE OR FALSEExplain how these factors: the size of bioaerosol, inspiratory flow rate, flow pattern, inhaled volume, respiratory rate influence the respiratory degration of bioaerosols.
- If a soil when sampled from the field weighed 30g(fresh weight) and after oven drying at 105°C overnight it weighed 25g( oven dry weight), what would be the moisture percentage?Formulate a compost mixture of at consisting of least three ingredients using the Cornell Composting Spreadsheet that will satisfy the range of percent moisture content from 50-60% and the range of C:N ratio from 25 to 35. A composting bioreactor has a total capacity of 500 kg. The total weight of the mixture ranges from 400-500 kg. Example: Ingredient % Moisture % Carbon % Nitrogen Mass (Ibs.) Laying hens manure 69.0 48.0 8.0 100 Leaves, Loose and dry 15.0 48.6 0.9 65 Corn cobs 15.0 58.8 0.6 150 Water 100.0 0.0 0.0 150 Total 465 Calculated mixture moisture content: 54.0 Calculated mixture C/N ratio: 31.2Which graph shows most clearly what will happen to the rate of transpiration as humidity increases? В rate of rate of transpiration transpiration humidity humidity D rate of rate of transpiration transpiration humidity humidity В O A C
