AGR3304 - Measure of Biological Activity in Soils - Social Science Assignment Help

Assignment Task

QUESTION 1 (a) The images below show deterioration in the physical soil structure. On the left is a group of farmers inspecting the results of cross ripping the field (plough blades ripped into the soil at 1.0 m depth in perpendicular directions) as a means to remediate the land surface. On the right is the same field in an aerial view. The issue has been caused by over grazing.

(i) Diagnose the phenomena, explaining why the B horizon has been exposed.

(ii) You notice that the cross ripping has not appeared to remediate the soil surface, given sufficient rain, and based upon observation of no vegetation establishment, and the fact clods brought up by the ripping have rounded surfaces. Imagine you are presenting to these farmers and explain this failure in your own words, using your diagnosis

(b) Briefly explain, in your own words, why respiration is used as a measure of biological activity in soils.

QUESTION 2 (a) The diagram below depicts typical matric potential and volumetric water content relationships for different soil textures. With respect to soil texture and soilseparates, answer the following questions:

(i) Justify why you expect the ranking of volumetric water contents for the given textures at a matric potential of 10-2 .

(ii) With reference to the soil separates, why does the clay soil and silt loam soil have greater volumetric water content at matric potential of 101 ?

(iii) Explain which of these soils has greater plant available water, justifying your answer with an estimated volumetric percentage of plant available water.

(b) In your own words, what is cation exchange capacity (CEC) of soil, and how does it develop? Explain how texture and the organic matter status of a soil can influence CEC.

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