Water: Coastal Zone Act Reauthorization Amendments
You are here: Water
Pollution Prevention & ControlPolluted RunoffCoastal Zone Act Reauthorization AmendmentsTable 2-2. Effects of Conservation Practices on Water Resource Parameters (USDA-SCS, 1988)
Pollution Prevention & ControlPolluted RunoffCoastal Zone Act Reauthorization AmendmentsTable 2-2. Effects of Conservation Practices on Water Resource Parameters (USDA-SCS, 1988)Table 2-2. Effects of Conservation Practices on Water Resource Parameters (USDA-SCS, 1988)
Table 2-2. Effects of Conservation Practices on Water Resource Parameters (USDA-SCS, 1988)
NOTE: Values in the tables are taken from published research, model simulations, and results of simulated rainfall plots. Both the range (in parentheses) and additional values within the range (after parentheses, separated by comma) are presented. The values describe the percentage change in mass loads caused by the use of the practice on a nonirrigated, nonlegume, continuous row crop that has been grown under conventional tillage. Values inside the range are shown behind the range values and are separated by commas (-30, -90), -76. Values from model simulation are marked by an M, e.g., -30M, and values from a rainfall simulator are marked with an S, e.g., -29S. Few data are available for arid conditions and that zone is not included in the table. Not all soil-climate combinations have available reference data. A minus is a decreased value; a plus is an increased.
|
|
|||||||||||||
| (a) | (b) | (c) | (d) | (e) | (f) | (g) | |||||||
| Water Budget (% Change) |
Phosphorus (% Change) |
Nitrogen (% Change) |
Pesticides (% Change) |
||||||||||
| Practice and Number | Climate and Soil | Surface Runoff | Deep Percolation | Sediment Yield (% Change) |
Sediment | Runoff | Nitrogen Adsorbed Phases | Nitrate in Surface Runoff | Nitrate in Percolate | Strongly Adsorbed SWb | Weakly Adsorbed Leachate | Weakly Adsorbed SWb | |
|
|
|||||||||||||
| Contour Farming 330 |
H-Sa | ||||||||||||
| Sandy Silty Clayey |
(-65, -75) (-60, -40) (-19, -20) |
# +10 +5 |
(-20, -50) (-65, -30) (-29, -55) |
-20 (-60, -65) -55 |
-10 (-60, -65) -20 |
-15 (-45, -54) -55 |
-5 (-25, -72), -40 (-12, -25) |
# +10, +7 +10 |
# # # |
# # # |
# # # |
||
| SA-Sa | |||||||||||||
| Silty Clayey |
(-27, -59) -54 |
# # |
(-22, -59) -26 |
# # |
# # |
# # |
# # |
+10 # |
# # |
# # |
# # |
||
| Ha | |||||||||||||
| Sandy Silty Clayey |
-30 -16 (-17, -29) |
+10 # # |
-60 (-30, -48) # |
-60 # # |
-30 # # |
-60 # # |
-35 (-25, -41) -12 |
+10 +6 +7 |
# # # |
# # # |
# # # |
||
| SAa | |||||||||||||
| Clayley | -15 | # | # | # | # | # | # | # | # | # | # | ||
| Strip-Cropping Contour 585 |
H-Sa | ||||||||||||
| Silty Clayey Sandy |
-5M -28M No change |
+9M +366Mc No change |
(-37,90M),-49 -89M -99M |
-80M -52M -99M |
-86M -89M -99M |
-81M -51M -98M |
-43M -26M -39M |
+158M +220Mc +12M |
# # # |
# # # |
0, +6 # # |
||
| Cons. Tillage- No Till 329 |
Ha | ||||||||||||
| Clayey Silty Sandyd |
(-33), +48) (-91, +36) (-26M, -88), -61 |
# No change # |
(-73M, -82) (-75, -99) (-66M, -99S) |
-53M (-64, -95) (-51, -87S) |
-30M (+900, -22)c (0, +155) |
-53M (-60s,-94) (-69s,-90s) |
-11 (-42,+800) -40,+100 (-67,-80) |
(-49M,+8) (8M,+16) 1,+8c 0 |
# -78 # |
# (+5M,-50) # |
-51M | ||
| SA-Sa | u-72s.-82 | -72,-70 | -42s,-45 | * | |||||||||
| Silty | +36 | # | -96 | (-80,-90) | +138 | (-50,-90),-60 | (0,+45) | +2 | # | # | # | ||
| H-Sa | |||||||||||||
| Silty | (-21,-90) | # | (-88,-99) | (-75,-90) | (+450,+160 0) | # | # | # | (-75,-90) | # | +500 | ||
| Cons. Tillage (Other types) 329 |
H-Sa | ||||||||||||
| Silty Clayey |
(-15,-73) -51,-20 -30 |
+5 +10 |
(-43,+95) -85,-55 -70 |
-90,-84 # |
+1850,+17 50c # |
-91,-82 # |
+1800,+95 0c # |
# # |
# # |
# # |
# # |
||
| SA-Sa | |||||||||||||
| Silty Clayey |
-54 (-29,-89) |
# +10 |
# (-70,-42) |
# # |
# # |
# # |
# # |
# # |
# # |
# # |
# # |
||
| Ha | |||||||||||||
| Sandy Silty Clayey |
(-40,-89) (-20,-26) (-10,-61),-20 |
+5 # +10 |
(-40,-66) (-49,-61) (-29,-86) -34,-41 |
-91 # # |
-3 # # |
-95 # # |
-88 # # |
# # # |
# (-69,-51) (-33M,-2) |
# # # |
# (+15,+27) (+60M,-2) |
||
| SAa | |||||||||||||
| Silty Sandy Clayey |
(-16,-25),-20 20 -31 -88M |
# # # |
(-38,-92),-69 -45 -90M |
# # # |
# # # |
# # # |
# # Not sig. |
# # # |
(-38,-81) # # |
# # # |
+63,+27 # # |
||
| Terraces with Underground outlets 600 |
H-Sa | ||||||||||||
| Sandy Silty Clayey |
-14 (-24,-60) (-30,-36) |
# (+12,+500)c (+5,+380)c |
(-95,-98) (-87,-95) (-95,-95) |
# -95 # |
# -60 -30 |
# -95 -95 |
# (-70,+55)u -30 |
# +15 +10 |
# # # |
# # # |
# # # |
||
| SA-Sa | |||||||||||||
| Silty Sandy Clayey |
-14 (-73,+43M) (-15,-36M) |
+67 +162 (+5,+293M)c |
(-95-98) (-95,-92M) (-95,-91M) |
-99M -97M -96M |
-42M -72M -65M |
-99M -97M -96M |
-42M -78M -91M |
+20 +37M (10 to high values) |
# # |
# # |
(-73,-91M) (-84,-91M) (-69M,-78M) |
||
| WASCOBf 638 |
Ha | ||||||||||||
| Sandy Silty Clayey |
-40 (-88,-42) # |
+15 # # |
(-95,-99) (-95,-92M) (-90,-95) |
# # # |
-40 -71 # |
-95 -95 # |
-50 (-86,-44) # |
+15 +8 # |
# # # |
# # # |
# -4 # |
||
| SAa | |||||||||||||
| Sandy Silty Clayey |
# -73 -30 |
# # +5 |
(-95,-98) -95 (-90,-95) |
# -73 # |
# +58c # |
# # # |
# -50 # |
# # # |
# # # |
# # # |
# # # |
||
| a Climatic conditions: H-S = Humid - Snow; H = Humid; SAS = Semi-Arid - Snow; and SA = Semi-Arid. b SW = Surface Water c Measured values were small numbers; percentage change may have large values. d Data have scattered values. |
e Measured values were large numbers. f Water and Sediment Control Basin u = Unknown, site-dependent, or conflicting values. # = No reported value. |
||||||||||||