1. A comparison of the A values in your two fields. What factors make one of the fields more or less erodible and why?

  Discussion 1. A comparison of the A values in your two fields. What factors make one of the fields more or less erodible and why? 2. An evaluation of alternative practices for both P and C that will improve conditions. If the A of your site is already below the tolerable soil loss, you could suggest alternatives that will push A to the limit of the tolerable soil loss value or you could suggest alternatives to decrease soil loss even more. 3. We would like you to evaluate future options or changes that you might consider if the land was yours (you can pretend you have a good cash flow) and to explain your reasoning. Please write the essay based on the 3 questions. I will introduce these values in Introduction. I got these value from RUSLEFAC Handbook, Please read RUSLEFAC Handbook about these values which link is: http://sis.agr.gc.ca/cansis/publications/manuals/2002-92/index.html Meaning of values A and C, P: 1.R value is the rainfall and runoff erosivity index required to predict erosion by water using USLE. R=1075 base on the Figure-R1 The soil erodibility factor (K) represents the rate of soil loss per unit are as measured on 3.7m*22m (12’*72’) plot 2. K is a quantitative measure of soil’s inherent susceptibility/resistance to erosion and the soil’s influence on runoff amount and rate 3. SL value account for the effects of slope angle and length on erosion Adjusts the erosion prediction for a given slope length and slope angle to account for differences from conditions present at standard erosion monitoring plots on which the SULE was based. 4.The C factor is used to determine the relative effectiveness of soil and crop management systems in terms of preventing or reducing soil loss C value is ratio comparing the soil eroded under a specific crop and management system to continuous fallow conditions. 5.The P factor accounts for the erosion control effectiveness of support practices P supports the cover and management factor. 6. A represents the potential, long term average annual soil loss in tonnes per hectare per year( originally calculated in tons per acre per year). this is the amount which is compared to the “tolerable soil loss” limits.   values in the two fields: First field: Texture=silt loam Organic matter=4.1% R=1075 base on the Figure R-1 pg46 K=0.049 base on the Table K-3 pg56 Length=100m Slop=0.23° LS=0.04 base on Table LS-2 pg62 C=0.16 base on Table C-3a I think we are region2, and I chose Grain corn, No till for field 1 P=1 base on Table 6.2 General P values I chose No support practice for both fields. Pg 37 A=R*K*LS*C*P=1075*0.049*0.04*0.16*1=0.33712 tonne/hectare/year   Second field: R=1075 K=0.016 Length=75m Slop=0.49° LS=0.09 Organic matter=4.6% Texture=sandy loam C=0.32 also region 2 I chose beans for crop and No Till for field 2 P=1 A=1075*0.016*0.09*0.32*1=0.49536 tonne/hectare/year value from RUSLEFAC Handbook, read RUSLEFAC Handbook about these values which link is: http://sis.agr.gc.ca/cansis/publications/manuals/2002-92/index.html