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Appendix C
AEZ Productivity Assessment Rule Definition Cards

Land productivity assessment as discussed here is based on the calculation of various multipliers referring to specific attributes of the land inventory entry under consideration. The rules controlling the necessary calculation steps are contained in a rule definition file, named RULES. Each record in the file can be identified by a two character code. Eleven different record types have been included in the file (see Chapter 2):

( 1) CC - Cards : Cash crop LGP allocation rules

( 2) CN - Cards : Crop cycle requirement rules

( 3) CR - Cards : Coarse material rating rules

( 4) CY - Cards : Crop yield by LGP

( 5) FR - Cards : Fallow land requirements

( 6) FY - Cards : Fluvisol LGP rules

( 7) PL - Cards : Pattern LGP rules

( 8) PP - Cards : Pattern proportion rules

( 9) PR - Cards : Phase rules

(10) SR - Cards : Soil suitability rating

(11) TR - Cards : Thermal zone suitability rating rules

The sequence of records in the rule definition file is not important, except that crop cycle requirement rules, i.e. records starting with CN, have to be included at the very beginning of the file. In the following the record format of each of these card types is summarized and illustrated by a short example.

C.1 CC - Card : Cash Crop LGP Allocation Rule

Card PositionContents
1 – 2card label
3 – 5country code
6 – 83-digit crop code
  9input level code
10 – 11pattern code
12 – 261-digit suitability rating by LGP
(MLGP=15 in the Kenya Case Study)

C.2 CN - Card : Crop Cycle Requirement Rules

Card PositionContents
1 – 2card label
3 – 5country code
6 – 83-digit crop code
9 – 11average crop cycle length (days)
12 – 31character*20 crop text label
32 – 34minimum crop cycle requirement (days)
35 – 38maximum crop cycle requirement (days)
39 – 41sequential crop number
  43crop mask type: 1=annual crops, 2=perennial crops, 3=pastures, trees
  44crop type index: l=cereals, 2=pulses, 3=roots, 4=perennial food crops,
 5=other cash crops, 6=not used,
 7=pastures,
 8=trees with nitrogen fixing abilities,
 9=trees without nitrogen fixing abilities
 crops with index> 3 cannot enter sequential crop combinations
  45slope cultivation association table look-up index:
 l=dry-land crops, 2=wetland crops, 3=other crops, pastures
  46inter-cropping eligibility indicator
  47water-stress table look-up index
48 – 51yield conversion factor from dry weight to fresh weight
  53vegetation cover factor rule index
  54vegetation cover percentage rule index:
 1= annual crops, 2=perennial crops, 3=trees
55vegetation cover percentage table look-up index, perennial crops
56 – 58percentage of LAI at residual stage in relation to LAI at harvesting stage
59 – 61crop stage distribution (percent): establishment
62 – 64crop stage distribution (percent): early vegetative
65 – 67crop stage distribution (percent): late vegetative
68 – 70crop stage distribution (percent): maturation
71 – 73crop specific multiplier K in crop cover percentage function
74 – 76maximum leaf area index (times 10), annual crops

C.3 CR - Card : Coarse Material Rating Rules

Card Position Contents

Card PositionContents
1 – 2card label
3 – 5country code
  6input level code
7 – 12character*6 coarse material description label
13 – 14coarse material code
15 – 79coarse material suitability rating by crop 1 to MCPR

C.4 CY - Card : Crop Yield by LGP Card Position Contents

Card PositionContents
1 – 2card label
3 – 5country code
6 – 8crop code
  9input level code
10 – 13maximum crop yield (10 kg dry weight per ha)
14 – 17crop yield in LGP 1
18 – 21crop yield in LGP 2
   . 
   . 
   . 
70 – 73crop yield in LGP 15*

C.5 FR - Card : Fallow Land Requirement Rules

Card PositionContents
1 – 2card label
3 – 5country code
  6input level code
7 – 9character*3 soil unit label
10 – 12soil unit code
13card sequence number by crop class
14 – 16requirement parameter THZ 1, LGP 60–89 days
17 – 19requirement parameter THZ 1, LGP 90–119 days
20 – 22requirement parameter THZ 1, LGP 120–179 days
23 – 25requirement parameter THZ 1, LGP 180–269 days
26 – 28requirement parameter THZ 1, LGP 270 < days
29 – 31requirement parameter THZ 2/3, LGP 60–89 days
32 – 34requirement parameter THZ 2/3, LGP 90–119 days
   . 
   . 
   . 
71 – 73requirement parameter THZ 6/7/8/9, LGP 270 < days

* In the Kenya Case Study 15 length of growing period zones have been delineated. In the computer program the number of LGP codes is defined by parameter constant MLGP (see Appendix A, Table A.10, and Appendix B).

C.6 FY - Card : Fluvisol LGP Suitability Rules

Card PositionContents
1 – 2card label
3 – 5country code
6 – 8crop code
  9input level code
10 – 13maximum crop yield (10kg dry weight / ha)
14 – 281-digit suitability rating, by LGP 1 to MLGP*

C.7 PL - Card : Pattern LGP Rules

Card PositionContents
1 – 2card label
3 – 5country code
6 – 7pattern code
8 – 9LGP code
10 – 11pattern component LGP LH
12 – 13pattern component LGP L1
14 – 15pattern component LGP L2
16 – 17pattern component LGP L21
18 – 19pattern component LGP L22
20 – 21pattern component LGP L3
22 – 23pattern component LGP L31
24 – 25pattern component LGP L32
26 – 27pattern component LGP L33
28 – 29pattern component LGP L4
30 – 31pattern component LGP L41
32 – 33pattern component LGP L42
34 – 35pattern component LGP L43
36 – 37pattern component LGP L44
38 – 39pattern component LGP LD

C.8 PP - Card : Pattern Proportion Rules

Card PositionContents
1 – 2card label
3 – 5country code
6 – 7rainfall pattern code
8 – 10probability of occurrence of humid pattern LH
11 – 13probability of occurrence of uni-modal pattern L1
14 – 16probability of occurrence of bi-modal pattern L2
17 – 19probability of occurrence of tri-modal pattern L3
20 – 22probability of occurrence of pattern L4
23 – 25probability of occurrence of dry pattern LD

C.9 PR - Card : Phase Rules

Card PositionContents
1 – 2card label
3 – 5country code
  6input level code
7 – 12character*6 phase combination label
13 – 14phase combination code
15 – 791-digit soil phase suitability rating by crop 1 to MCRP*

* In the Kenya Case Study MCRP=96 crops have been considered (see Appendix A). Hence, two lines had to be used per coarse material code, the first line containing ratings for crops 1 to 65, the second line for crops 66 to 96.

C.10 SR - Card : Soil Unit Rules

Card PositionContents
1 – 2card label
3 – 5country code
  6input level code
7 – 11character*5 soil unit label
12 – 14soil unit code
15 – 791-digit soil suitability rating by crop 1 to MCRP

C.11 TR - Card : Thermal Zone Suitability Rules

Card PositionContents
1 – 2card label
3 – 5country code
6input level code (not used)
7 – 93-digit crop code
10 – 181-digit thermal zone suitability rating, by THZ 1 to THZ 9

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