| # |
Field Name |
Variable Name |
Units |
Type |
Description |
| 1 |
ID |
|
|
Long integer |
|
| 2 |
SCRP(1,1) |
|
|
Single precision floating point |
EXPRESSES THE EFFECT OF SOIL COURSE FRAGMENT CONTENT ON (N=1,2) PLANT ROOT GROWTH RESTRICTION. X = % COURSE FRAGMENT. |
| 3 |
SCRP(1,2) |
|
|
Single precision floating point |
|
| 4 |
SCRP(2,1) |
|
|
Single precision floating point |
GOVERNS SOIL EVAPORATION AS A FUNCTION OF SOIL DEPTH. X = SOIL DEPTH(MM) |
| 5 |
SCRP(2,2) |
|
|
Single precision floating point |
|
| 6 |
SCRP(3,1) |
|
|
Single precision floating point |
DRIVES HARVEST INDEX DEVELOPMENT AS A FUNCTION OF CROP MATURITY. X = % OF GROWING SEASON.
|
| 7 |
SCRP(3,2) |
|
|
Single precision floating point |
|
| 8 |
SCRP(4,1) |
|
|
Single precision floating point |
NRCS RUNOFF CURVE NUMBER SOIL WATER RELATIONSHIP. EXCEPTION TO NORMAL S-CURVE PROCEDURE--SOIL WATER FRACTIONS TAKEN FROM SCRP(20,N) TO MATCH WITH CN2 AND CN3(AVERAGE AND WET CONDITION RUNOFF CURVE NUMBERS). |
| 9 |
SCRP(4,2) |
|
|
Single precision floating point |
|
| 10 |
SCRP(5,1) |
|
|
Single precision floating point |
ESTIMATES SOIL COVER FACTOR USED IN SIMULATING SOIL TEMPERATURE. X = TOTAL ABOVE GROUND PLANT MATERIAL DEAD AND ALIVE. Version 5300 only. |
| 11 |
SCRP(5,2) |
|
|
Single precision floating point |
|
| 12 |
SCRP(6,1) |
|
|
Single precision floating point |
SETTLES AFTER TILLAGE SOIL BULK DENSITY TO NORMAL VALUE AS A FUNCTION OF RAINFALL AMOUNT, SOIL TEXTURE, AND SOIL DEPTH. X = RAINFALL(MM) ADJUSTED FOR SOIL TEXTURE AND DEPTH. |
| 13 |
SCRP(6,2) |
|
|
Single precision floating point |
|
| 14 |
SCRP(7,1) |
|
|
Single precision floating point |
DETERMINES THE ROOT GROWTH AERATION STRESS FACTOR AS A FUNCTION OF SOIL WATER CONTENT AND THE CRITICAL AERATION FACTOR FOR THE CROP. X = SOIL WATER-CRITICAL AERATION FACTOR. |
| 15 |
SCRP(7,2) |
|
|
Single precision floating point |
|
| 16 |
SCRP(8,1) |
|
|
Single precision floating point |
DETERMINES THE PLANT STRESS CAUSED BY N OR P DEFICIENCY. X = % OF OPTIMAL N OR P CONTENT PRESENT IN PLANT. |
| 17 |
SCRP(8,2) |
|
|
Single precision floating point |
|
| 18 |
SCRP(9,1) |
|
|
Single precision floating point |
CALCULATES THE PEST DAMAGE FACTOR AS A FUNCTION OF TEMPERATURE, CONSIDERING THRESHOLDS FOR 30-DAY RAINFALL AND ABOVE GROUND PLANT MATERIAL. X = SUM OF DAILY MINIMUM TEMPERATURE WITH RAINFALL ADJUSTMENT. |
| 19 |
SCRP(9,2) |
|
|
Single precision floating point |
|
| 20 |
SCRP(10,1) |
|
|
Single precision floating point |
CALCULATES THE EFFECT OF WATER STRESS ON HARVEST INDEX AS A FUNCTION OF PLANT WATER USE. X = PLANT WATER USE AS A % OF POTENTIAL PLANT WATER USE DURING CRITICAL PERIOD. |
| 21 |
SCRP(10,2) |
|
|
Single precision floating point |
|
| 22 |
SCRP(11,1) |
|
|
Single precision floating point |
version 8120/0250. ESTIMATES PLANT WATER STRESS AS A FUNCTION OF PLANT AVAILABLE WATER STORED. X = SOIL WATER STORED DIVIDED BY TOTAL PLANT AVAILABLE WATER STORAGE(FC-WP). |
| 23 |
SCRP(11,2) |
|
|
Single precision floating point |
|
| 24 |
SCRP(12,1) |
|
|
Single precision floating point |
GOVERNS N VOLATILIZATION AS A FUNCTION OF SOIL DEPTH. X = DEPTH AT THE CENTER OF A SOIL LAYER (MM). |
| 25 |
SCRP(12,2) |
|
|
Single precision floating point |
|
| 26 |
SCRP(13,1) |
|
|
Single precision floating point |
CALCULATES WIND EROSION VEGETATIVE COVER FACTOR AS A FUNCTION OF ABOVE GROUND PLANT MATERIAL. X = VEGETATIVE EQUIVALENT (C1*BIOM+C2*STD+C3*RSD). WHERE C1, C2, AND C3 ARE COEFFICIENTS, BIOM IS ABOVE GROUND BIOMASS, STD IS STANDING DEAD PLANT RESIDUE, AND RSD IS FLAT RESIDUE. |
| 27 |
SCRP(13,2) |
|
|
Single precision floating point |
|
| 28 |
SCRP(14,1) |
|
|
Single precision floating point |
CALCULATES SOIL TEMPERATURE FACTOR USED IN REGULATING MICROBIAL PROCESSES. X = SOIL TEMPERATURE(C). |
| 29 |
SCRP(14,2) |
|
|
Single precision floating point |
|
| 30 |
SCRP(15,1) |
|
|
Single precision floating point |
EXPRESSES PLANT POPULATION EFFECT ON WATER EROSION COVER FACTOR. X = PLANT POPULATION(PLANTS/M**2). |
| 31 |
SCRP(15,2) |
|
|
Single precision floating point |
|
| 32 |
SCRP(16,1) |
|
|
Single precision floating point |
INCREASES SNOW MELT AS A FUNCTION OF TIME SINCE THE LAST SNOW FALL. X = TIME SINCE THE LAST SNOWFALL(D) |
| 33 |
SCRP(16,2) |
|
|
Single precision floating point |
|
| 34 |
SCRP(17,1) |
|
|
Single precision floating point |
ESTIMATES THE SNOW COVER FACTOR AS A FUNCTION OF SNOW PRESENT X = SNOW PRESENT (MM H2O). |
| 35 |
SCRP(17,2) |
|
|
Single precision floating point |
|
| 36 |
SCRP(18,1) |
|
|
Single precision floating point |
EXPRESSES SOIL TEMPERATURE EFFECT ON EROSION OF FROZEN SOILS. X = TEMPERATURE OF SECOND SOIL LAYER(C). |
| 37 |
SCRP(18,2) |
|
|
Single precision floating point |
|
| 38 |
SCRP(19,1) |
|
|
Single precision floating point |
DRIVES WATER TABLE BETWEEN MAXIMUM AND MINIMUM LIMITS AS A FUNCTION OF GROUND WATER STORAGE. X = % OF MAXIMUM GROUND WATER STORAGE. |
| 39 |
SCRP(19,2) |
|
|
Single precision floating point |
|
| 40 |
SCRP(20,1) |
|
|
Single precision floating point |
|
| 41 |
SCRP(20,2) |
|
|
Single precision floating point |
SETS SOIL WATER CON TENTS COINCIDING WITH CN2 AND CN3. SOIL WATER CON TENT AS % OF POROSITY - FIELD CAPACITY. |
| 42 |
SCRP(21,1) |
|
|
Single precision floating point |
|
| 43 |
SCRP(21,2) |
|
|
Single precision floating point |
|
| 44 |
SCRP(22,1) |
|
|
Single precision floating point |
|
| 45 |
SCRP(22,2) |
|
|
Single precision floating point |
|
| 46 |
SCRP(23,1) |
|
|
Single precision floating point |
|
| 47 |
SCRP(23,2) |
|
|
Single precision floating point |
|
| 48 |
SCRP(24,1) |
|
|
Single precision floating point |
|
| 49 |
SCRP(24,2) |
|
|
Single precision floating point |
|
| 50 |
SCRP(25,1) |
|
|
Single precision floating point |
SETS SOIL WATER CONTENTS COINCIDING WITH CN2 AND CN3. SOIL WATER CONTENT AS % OF FIELD CAPACITY - WILTING POINT. |
| 51 |
SCRP(25,2) |
|
|
Single precision floating point |
|
| 52 |
PARM(1) |
|
|
Single precision floating point |
CROP CANOPY-PET(1_2) FACTOR USED TO ADJUST CROP CANOPY RESISTANCE IN THE PENMAN-MONTEITH PET EQ. |
| 53 |
PARM(2) |
|
|
Single precision floating point |
ROOT GROWTH-SOIL STRENGTH(1_2) NORMALLY 1.152. ELIMINATES ALL ROOT GROWTH STRESS. |
| 54 |
PARM(3) |
|
|
Single precision floating point |
WATER STRESS-HARVEST INDEX(0_1) SETS FRACTION OF GROWING SEASON WHEN WATER STRESS STARTS REDUCING HARVEST INDEX. |
| 55 |
PARM(4) |
|
|
Single precision floating point |
DENITRIFICATION RATE CONSTANT(.1_2) CONTROLS DENITRIFICATION RATE. |
| 56 |
PARM(5) |
|
|
Single precision floating point |
SOIL WATER LOWER LIMIT(0_1) LOWER LIMIT OF WATER CONTENT IN THE TOP 0.5 M SOIL DEPTH EXPRESSED AS A FRACTION OF THE WILTING POINT WATER CONTENT. |
| 57 |
PARM(6) |
|
|
Single precision floating point |
WINTER DORMANCY(H)(0_1) CAUSES DORMANCY IN WINTER GROWN CROPS. GROWTH DOES NOT OCCUR WHEN DAY LENGTH IS LESS THAN ANNUAL MINIMUM DAY LENGTH + PARM(6). |
| 58 |
PARM(7) |
|
|
Single precision floating point |
N FIXATION(0_1) AT 1. FIXATION IS LIMITED BY SOIL WATER OR NITRATE CONTENT OR BY CROP GROWTH STAGE. At 0 FIXATION MEETS CROP N UPTAKE DEMAND. A COMBINATION OF THE 2 FIXATION ESTIMATES IS OBTAINED BY SETTING 0 < Parm(7)< 1. |
| 59 |
PARM(8) |
|
|
Single precision floating point |
SOLUBLE P RUNOFF COEF(.1*M^3/T)(10_20) P CONCENTRATION IN SEDIMENT DIVIDED BY THAT OF THE WATER. |
| 60 |
PARM(9) |
|
|
Single precision floating point |
PEST DAMAGE MOISTURE THRESHOLD (MM) (25_150) PREVIOUS 30-DAY RAINFALL MINUS RUNOFF. |
| 61 |
PARM(10) |
|
|
Single precision floating point |
PEST DAMAGE COVER THRESHOLD (T/HA)(1_10) CROP RESIDUE + ABOVE GROUND BIOMASS. |
| 62 |
PARM(11) |
|
|
Single precision floating point |
MOISTURE REQUIRED FOR SEED GERMINATION (MM) (10_30) SOIL WATER STORED MINUS WILTING POINT STORAGE IN TOP 0.2 M OF SOIL. |
| 63 |
PARM(12) |
|
|
Single precision floating point |
SOIL EVAPORATION COEF (1.5_2.5) GOVERNS RATE OF SOIL EVAPORATION FROM TOP 0.2 M OF SOIL. |
| 64 |
PARM(13) |
|
|
Single precision floating point |
HARGREAVES PET EQ EXP (0.5_0.6) ORIGINAL VALUE=0.5. MODIFIED TO 0.6 TO INCREASE PET |
| 65 |
PARM(14) |
|
|
Single precision floating point |
NITRATE LEACHING RATIO(0.1_1) NITRATE CONCENTRATION IN SURFACE RUNOFF TO NITRATE CONCENTRATION IN PERCOLATE. |
| 66 |
PARM(15) |
|
|
Single precision floating point |
GROUND WATER STORAGE LOSS RATE(MM/D)(1_10) |
| 67 |
PARM(16) |
|
|
Single precision floating point |
|
| 68 |
PARM(17) |
|
|
Single precision floating point |
CRACK FLOW COEF(0_1) FRACTION OF INFLOW TO A SOIL LAYER ALLOWED TO FLOW THROUGH IN CRACKS. |
| 69 |
PARM(18) |
|
|
Single precision floating point |
PESTICIDE LEACHING RATIO(0.1_1) PESTICIDE CONCENTRATION IN SURFACE RUNOFF TO PESTICIDE CONCENTRATION IN PERCOLATE. |
| 70 |
PARM(19) |
|
|
Single precision floating point |
FRACTION OF MATURITY AT SPRING GROWTH INITIATION(0_1) ALLOWS FALL GROWING CROPS TO RESET HEAT UNIT INDEX TO A VALUE GREATER THAN 0 WHEN PASSING THROUGH THE MINIMUM TEMP MONTH. |
| 71 |
PARM(20) |
|
|
Single precision floating point |
|
| 72 |
PARM(21) |
|
|
Single precision floating point |
PLANT RESIDUE MINERALIZATION PARTITION COEF(0.1_0.3) FRACTION OF CROP RESIDUE MINERALIZATION PLACED IN ACTIVE ORGANIC N POOL. |
| 73 |
PARM(22) |
|
|
Single precision floating point |
HUMUS MINERALIZATION RATE CONTROL(0_1) REDUCES HUMUS MINERALIZATION AS SOIL NITRATE CONCENTRATION INCREASES. |
| 74 |
PARM(23) |
|
|
Single precision floating point |
WATER EROSION COVER FACTOR COEF(0.5_2) INCREASING REDUCES USLE C FACTOR FOR ANY COVER VALUE. |
| 75 |
PARM(24) |
|
|
Single precision floating point |
MAXIMUM DEPTH FOR BIOLOGICAL MIXING(M)(0.1_0.3) |
| 76 |
PARM(25) |
|
|
Single precision floating point |
BIOLOGICAL MIXING EFFICIENCY(0.1_0.5) SIMULATES MIXING IN TOP SOIL BY EARTH WORMS ETC. PARM(24) SETS DEPTH. |
| 77 |
PARM(26) |
|
|
Single precision floating point |
N FIXATION PARTITION COEF(0_.5) FRACTION OF FIXED N PARTITIONED TO THE ACTIVE ORGANIC N POOL. |
| 78 |
PARM(27) |
|
|
Single precision floating point |
LOWER LIMIT NITRATE CONC(0_10.) MAINTAINS SOIL NITRATE CONCENTRATION AT OR ABOVE PARM(27). |
| 79 |
PARM(28) |
|
|
Single precision floating point |
ACCEPTABLE PLANT N STRESS LEVEL(0_1) USED TO ESTIMATE ANNUAL N APPLICATION RATE AS PART OF THE AUTOMATIC FERTILIZER SCHEME. |
| 80 |
PARM(29) |
|
|
Single precision floating point |
HUMUS MINERALIZATION RATE CONSTANT(0.0003_0.003) TRADITIONAL EPIC VALUE=0.0003. RECENT HEAVY MANURE APPLICATIONS USE 0.003. |
| 81 |
PARM(30) |
|
|
Single precision floating point |
DNITRIFICATION SOIL-WATER THRESHOLD(.9_1.1) FRACTION OF FIELD CAPACITY SOIL WATER STORAGE TO TRIGGER DNITRIFICATION. |
| 82 |
PARM(31) |
|
|
Single precision floating point |
FURROW IRRIGATION SEDIMENT ROUTING EXPONENT(1_1.5) EXPONENT OF WATER VELOCITY FUNCTION FOR ESTIMATING POTENTIAL SEDIMENT CONCENTRATION. |
| 83 |
PARM(32) |
|
|
Single precision floating point |
LOWER BOUND FOR USLE C FACTOR(.001_.05) CONSTRAINS USLE C FACTOR REGARDLESS OF TOTAL COVER. |
| 84 |
PARM(33) |
|
|
Single precision floating point |
SOLUBLE P RUNOFF EXPONENT MODIFIED SHARPLEY METHOD(1_1.5) MAKES SOLUBLE P RUNOFF CONCENTRATION A NON LINEAR FUNCTION OF THE CLAY/CARBON RATIO IN LAYER 1. |
| 85 |
PARM(34) |
|
|
Single precision floating point |
SOLUBLE P RUNOFF EXPONENT MODIFIED GLEAMS METHOD(1_1.5) MAKES SOLUBLE P RUNOFF CONCENTRATION A NON LINEAR FUNCTION OF ORGANIC P CONCENTRATION IN SOIL LAYER 1. |
| 86 |
PARM(35) |
|
|
Single precision floating point |
WATER STRESS WEIGHTING COEF(0_1) AT 0 PLANT WATER STRESS IS STRICTLY A FUNCTION OF SOIL WATER CONTENT; AT 1 PLANT WATER STRESS IS STRICTLY A FUNCTION OF ACTUAL ET DIVIDED BY POTENTIAL ET. 0
|
| 87 |
PARM(36) |
|
|
Single precision floating point |
FURROW IRRIGATION BASE SEDIMENT CONC(T/M^3)(0.01_0.2) POTENTIAL SEDIMENT CONCENTRATION WHEN FLOW VELOCITY = 1.(M/S) |
| 88 |
PARM(37) |
|
|
Single precision floating point |
PEST KILL SCALING FACTOR (100_10000) SCALES PESTICIDE KILL EFFECTIVENESS TO MAGNITUDE OF PEST GROWTH INDEX. |
| 89 |
PARM(38) |
|
|
Single precision floating point |
HARGREAVES PET EQ COEF (0.0023_0.0032) ORIGINAL VALUE = 0.0023. MODIFIED TO 0.0032 TO INCREASE PET. |
| 90 |
PARM(39) |
|
|
Single precision floating point |
AUTO N FERT SCALING FACTOR (50_500) SETS INITIAL ANNUAL CROP N USE CONSIDERING WA & BN3. |
| 91 |
PARM(40) |
|
|
Single precision floating point |
New for 0250. CROP GROWTH CLIMATIC FACTOR ADJUSTMENT (C/MM)(40._100.) |
| 92 |
PARM(41) |
|
|
Single precision floating point |
New for 0250. PLOW LAYER DEPTH (M)(.05_.15) USED TO TRACK SOLUBLE P CONCENTRATION OR WEIGHT. |
| 93 |
PARM(42) |
|
|
Single precision floating point |
Used in determining the SCS curve number retention parameter variable (SC1). When NVCN =4, SC1 is modified daily by subtracting rainfall, adding runoff and finally adding a portion of the potential ET based on the value of PARM42. Setting PARM42 to a very low value (near 0) would result in greatly increased runoff and is not recommended; best results are seen between 0.5 and 2.0. This SC1 modification approach is especially useful in reducing overprediction of runoff for shallow soils, and appears to work well for deeper soils too (JRW). |
| 94 |
PARM(43) |
|
|
Single precision floating point |
|
| 95 |
PARM(44) |
|
|
Single precision floating point |
|
| 96 |
PARM(45) |
|
|
Single precision floating point |
|
| 97 |
PARM(46) |
|
|
Single precision floating point |
|
| 98 |
PARM(47) |
|
|
Single precision floating point |
|
| 99 |
PARM(48) |
|
|
Single precision floating point |
CENTURY PASSIVE HUMUS TRANSFORMATION RATE D^-1(0.0000082_0.000015) ORIGINAL VALUE = 0.000012 |
| 100 |
PARM(49) |
|
|
Single precision floating point |
|
| 101 |
PARM(50) |
|
|
Single precision floating point |
TECHNOLOGY COEF (0.0_0.01) LINEAR ADJUSTMENT TO HARVEST INDEX--BASE YR=2000. |
| 102 |
PARM(51) |
|
|
Single precision floating point |
COEF ADJUSTS MICROBIAL ACTIVITY FUNCTION IN TOP SOIL LAYER (0.1_1.) |
| 103 |
PARM(52) |
|
|
Single precision floating point |
|
| 104 |
PARM(53) |
|
|
Single precision floating point |
|
| 105 |
PARM(54) |
|
|
Single precision floating point |
|
| 106 |
PARM(55) |
|
|
Single precision floating point |
|
| 107 |
PARM(56) |
|
|
Single precision floating point |
|
| 108 |
PARM(57) |
|
|
Single precision floating point |
|
| 109 |
PARM(58) |
|
|
Single precision floating point |
|
| 110 |
PARM(59) |
|
|
Single precision floating point |
|
| 111 |
PARM(60) |
|
|
Single precision floating point |
|
| 112 |
PARM(61) |
|
|
Single precision floating point |
|
| 113 |
PARM(62) |
|
|
Single precision floating point |
|
| 114 |
PARM(63) |
|
|
Single precision floating point |
|
| 115 |
PARM(64) |
|
|
Single precision floating point |
|
| 116 |
PARM(65) |
|
|
Single precision floating point |
|
| 117 |
PARM(66) |
|
|
Single precision floating point |
|
| 118 |
PARM(67) |
|
|
Single precision floating point |
|
| 119 |
PARM(68) |
|
|
Single precision floating point |
|
| 120 |
PARM(69) |
|
|
Single precision floating point |
|
| 121 |
PARM(70) |
|
|
Single precision floating point |
|
| 122 |
PARM(71) |
|
|
Single precision floating point |
|
| 123 |
PARM(72) |
|
|
Single precision floating point |
|
| 124 |
PARM(73) |
|
|
Single precision floating point |
|
| 125 |
PARM(74) |
|
|
Single precision floating point |
|
| 126 |
PARM(75) |
|
|
Single precision floating point |
|
| 127 |
PARM(76) |
|
|
Single precision floating point |
|
| 128 |
Cost Irrigation Water |
|
|
Single precision floating point |
|
| 129 |
Cost Lime |
|
|
Single precision floating point |
|
| 130 |
Cost Nitrogen |
|
|
Single precision floating point |
|
| 131 |
Cost Phosphorus |
|
|
Single precision floating point |
|
| 132 |
Cost Fuel |
|
|
Single precision floating point |
|
| 133 |
Cost Labor |
|
|
Single precision floating point |
|
| 134 |
Cost Z1 |
|
|
Single precision floating point |
|
| 135 |
Cost Z2 |
|
|
Single precision floating point |
|