If the predicted soil loss at Memphis, Tennessee, for a given set of conditions
ID: 284623 • Letter: I
Question
If the predicted soil loss at Memphis, Tennessee, for a given set of conditions is 12 Mg/ha, what is the expected soil loss at your present location if all factors are the same except the rainfall factor? On a 60-m long slope, what is the relative difference in water erosion between slopes of 2 and 10%, assuming other factors are constant? If the soil loss for a given set of conditions is 4.5 Mg ha for a 60-m length of slope, what soil loss could be expected for a 240-m slope length if the slope is 5%? Given your present location, assume that K = 0.015, 1 = 91 m, s = 10%, C = 0.2, and that up- and downslope farming is practiced. What is the soil loss? What conservation practice should be adopted if the soil loss is to be reduced to 5 Mg/ha?Explanation / Answer
answer- predicted soil loss at Memphis, Tennessee is = 12 Mg/ha.
It is also given that all factor that affect the soil loss are similiar in Memphis region except rainfall factor is different.
the original soil loss when the climatic factor are difference for the region then expected soil loss is 12mg/Ha
answer - length of slope L = 60m its also given that all other factor are constant
slope S = 2% then water erosion will be = 60*2 = 120m
when slope is = 10% then water erosion will be = 60*10 = 600m
so the difference between water erosion will be = 600-120 = 480m
answer- soil erodiblity factor K = 0.015
length of slope L= 91
Slope (S) = 10
C= 0.2
soil loss = KLSC = 0.015*91*10*0.2 = 2.73
the common practise to reduce soil loss
- perimeter runoff control
- salinity management
- crop rotation
- contour plowing
- terrace farming
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