938
Table 4. CRI ES-AIS-YIELD model, Example of
Phase IV Output
tltU GENERATOR «KIES - «IS - TIELDl
MCHiGAM STATE WIVESSITT, EAST LAKSING, «1 «823
Phase IV output calculates the estimated
yield based on moisture availability for
user-specified increments during the cropping
cycle.
Syrrif
Soils
couNTiv «wci janaica
POL./**. DISTRICT: ST. OMSK
IttTMER STATION NNC> WORTHY PNK
«SOURCE PROO UNIT OR
Awo-ecaiûGic/L me- 11
CHOP TY9£i
YEAR OF ORIGIN!
OR0ШН PERIOD:
РЙОО POTWTIAL bWTi
TO0ACO) LATITUDE!
1981 I SPHERE :
2/15/1901 TO VIS/1901 AWERAGE ALTITUDE:
1.12 TIIC INCRBGfTS MTU
18.01 < ^*9 )
NORTHERN
99.06(a)
3
PHASE 4> CALCULATION OF ESTIMATED YIELD (V«)
T HTH/WY MU EWT(ET.) ACT EVAPT(ET»> YU AESP FACTOR CHANGE P YIEU CHANGE E YIELD CUT* YIELD (Y«)
(•AYS) (aa/tfT) <«/4T) <ky) (kf/U) <kg/h*) (kg/k«)
3 2/15 7.04 7.04
10 2/20 7.10 7.10
15 2/25 7.16 7.16
20 3/ 2 15.47 15.46
25 3/ 7 15.39 15.59
30 3/12 15.72 15.71
35 3/17 15.73 15.73
40 3/22 15.68 15.68
45 3/27 22.90 20.11
50 4/ 1 22.80 19.84
55 4/ 6 22.71 19.57
60 4/11 22.60 19.30
65 4/16 22.70 22.23
70 4/21 22.94 22.95
75 4/26 20.01 20.01
80 3/ 1 20.22 20.22
85 V 6 20.43 20.43
90 3/11 20.64 20.64
.15 161.50
.13 164.02
.15 166.54
.00 169.07
.00 171.61
.00 174.15
.00 175.14
.00 175.12
.50 175.11
.50 175.11
.30 175.12
.50 175.14
.50 175.91
.50 177.16
.50 178.42
.30 179.67
.50 180.94
.50 182.20
161.50 162.
164.02 -526.
166.54 492.
169.07 661.
171.61 833.
174.15 1007.
175.14 1182.
175.12 1357.
164.44 1522.
163.74 1685.
163.01 1848.
162.35 2011.
174.09 2185.
177.16 2362.
178.42 2540.
179.67 2720.
ltO.94 2901.
182.20 ЗОЮ.
TOTAL
3083.
Estimates can be provided for a "standard
year" calculated from time series data and
monthly means or for a single year and
compared with observed yields. This last
capability is especially useful in comparing
the predictive ability of the yield model for
selected agro-eco1ogica 1 conditions or
representative farming systems. As an
example, a comparison is provided between
estimated and reported yield for sugar cane
over the time period 1965 - 1981 for a
s e1e cted sugar estate in St. Catherine
Parish, Jamaica (Figure 6). The reported low
in 1977 is the result of harvesting problems
experienced during that year.
7. REFERENCES
Doorenbos J. and A.H. Kassam, 1979. Yield
Response to Water. FAO Irrigation and
Drainage Paper # 33, FAO, Rome.
Etherington, D. and P. Matthews, 1985. MULBUD
User's Manual, National Centre for
Development Studies, Australian National
University.
Power P. et al., 1 9 85 . MSTAT, A Micro
computer Program for the Design, Management,
and Analysis of Agronomic Research
Experiments. Michigan State University, East
Lansing, Michigan.
Schultink G. et al., 1986. User's Guide to
the CRIES Geographic Information System -
Version 6.0, CRIES project, Michigan State
University, East Lansing, Michigan.
Jama1ca/St. Catherine/Worthy Park
Sugar Cane Performance 1963 - 1982
Figure 6. Graphic Comparison of Predicted
(CRIES-AIS-YIELD) and Observed Sugar Cane
Production for the Period I960 - 198? in
Worthy Park Sugar Estate, St. Catherine
Parish, Jamaica.
6. SELECTED EXAMPLES OF CRIES-AIS-YIELD
To introduce users to YIELD model which can
be employed in quantitative land evaluation
studies, selected outputs are provided, using
data from Jamaica. First of all, output is
provided of a yield simulation for two
commodities grown in close proximity to the
Worthy Park weather station (Tables 3 and 4).
Phase I output indicates the format of
maximum potential yield based on genetic crop
production potential without input and
management constraints.
infoi
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