This report describes standardized data for “Assessment of Polyploid Varieties of Cassava for high yield and disease resistance in an Uniform Yield Trial (30 clones) in Ibadan 1995/1996 Breeding Season”. These data were standardized on 2024-09-18 by Robert Hijmans with this R script. The original data have a CC-BY license. Here you can download the standardized data.

This is the full citation of the data set:

Kulakow, Peter; Ismail Rabbi; Elizabeth Parkes; Chiedozie Egesi; Olufemi Aina; Prasad Peteti; Agbona Afolabi (1996). Assessment of Polyploid Varieties of Cassava for high yield and disease resistance in an Uniform Yield Trial (30 clones) in Ibadan 1995/1996 Breeding Season. International Institute of Tropical Agriculture (IITA). Not versioned. doi:10.25502/XVQG-HX15

The dataset has 120 records and 29 variables for cassava in Nigeria. The dataset has 1 treatment(s): variety.


These are the first 25 records:

records
country location longitude latitude geo_from_source trial_id planting_date harvest_date on_farm is_survey rep crop variety variety_alt variety_code dmy_storage fwy_storage fwy_residue yield_part yield N_fertilizer P_fertilizer K_fertilizer irrigated plot_length plot_width harvest_index
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 10.3 31700 NA roots 31700 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA4(2)1425 NA 246 9.3 30900 NA roots 30900 NA NA NA NA NA NA 0.7
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA63397 NA 254 4.3 15100 NA roots 15100 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8101623 NA 1157911 7.0 28300 NA roots 28300 NA NA NA NA NA NA 0.4
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8400136 NA 698453 3.8 19200 NA roots 19200 NA NA NA NA NA NA 0.6
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8400316 NA 137958 4.0 14900 NA roots 14900 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8700018-28 NA 1337646 8.8 31200 NA roots 31200 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8700018-42 NA 137954 3.3 14200 NA roots 14200 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA88112-7 NA 1337647 12.3 33900 NA roots 33900 NA NA NA NA NA NA 0.6
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900001-10 NA 1337649 5.9 23400 NA roots 23400 NA NA NA NA NA NA 0.4
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900001-2 NA 1337650 1.7 11800 NA roots 11800 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-10 NA 1337651 4.1 36000 NA roots 36000 NA NA NA NA NA NA 0.7
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-104 NA 1337652 5.0 26500 NA roots 26500 NA NA NA NA NA NA 0.7
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-105 NA 1263552 3.7 20100 NA roots 20100 NA NA NA NA NA NA 0.7
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-1 NA 803524 7.8 31300 NA roots 31300 NA NA NA NA NA NA 0.7
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-114 NA 1337653 2.7 19800 NA roots 19800 NA NA NA NA NA NA 0.7
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-13 NA 1079619 3.6 15700 NA roots 15700 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-35 NA 1337655 2.6 15500 NA roots 15500 NA NA NA NA NA NA 0.4
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-4 NA 1337656 5.2 33000 NA roots 33000 NA NA NA NA NA NA 0.6
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-42 NA 1337657 8.1 32800 NA roots 32800 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-43 NA 1337658 2.8 17100 NA roots 17100 NA NA NA NA NA NA 0.5
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-46 NA 1337660 2.0 12100 NA roots 12100 NA NA NA NA NA NA 0.7
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-48 NA 1337661 4.8 25500 NA roots 25500 NA NA NA NA NA NA 0.6
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-49 NA 1337662 6.8 30800 NA roots 30800 NA NA NA NA NA NA 0.6
Nigeria Ibadan 3.94704 7.37754 TRUE 95uyt30ppIB 1995-04-14 1996-04-15 FALSE FALSE 1 cassava IITA-TMS-IBA8900003-58 NA 1337663 2.6 17300 NA roots 17300 NA NA NA NA NA NA 0.6


The observations are for 1 locations, for which we have 1 unique mapped locations.


The standardization script emits the following non-compliance warnings.

message
fwy_storage (0, 72500)
120 harvest_date more than 366 days after planting_date

The overall quality of the dataset, given the completeness of required variables was 5.6 on a scale of 10. See the table below

variable completeness (%)
planting_date 100
harvest_date 100
N_fertilizer 0
P_fertilizer 0
K_fertilizer 0
irrigated 0
latitude 100
longitude 100
location 100


The data are further summarized in the table below.

Variable Stats / Values Freqs (% of Valid) Graph Missing
country [character] 1. Nigeria
120(100.0%)
 0 (0.0%)
location [character] 1. Ibadan
120(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. TRUE
120(100.0%)
 0 (0.0%)
trial_id [character] 1. 95uyt30ppIB
120(100.0%)
 0 (0.0%)
planting_date [character] 1. 1995-04-14
120(100.0%)
 0 (0.0%)
harvest_date [character] 1. 1996-04-15
120(100.0%)
 0 (0.0%)
on_farm [logical] 1. FALSE
120(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
120(100.0%)
 0 (0.0%)
rep [integer]
Mean (sd) : 2.5 (1.1)
min ≤ med ≤ max:
1 ≤ 2.5 ≤ 4
IQR (CV) : 1.5 (0.4)
1:30(25.0%)
2:30(25.0%)
3:30(25.0%)
4:30(25.0%)
 0 (0.0%)
crop [character] 1. cassava
120(100.0%)
 0 (0.0%)
variety [character]
1. IITA-TMS-IBA30572
2. IITA-TMS-IBA4(2)1425
3. IITA-TMS-IBA63397
4. IITA-TMS-IBA8101623
5. IITA-TMS-IBA8400136
6. IITA-TMS-IBA8400316
7. IITA-TMS-IBA8700018-
8. IITA-TMS-IBA8700018-
9. IITA-TMS-IBA88112-7
10. IITA-TMS-IBA8900001-
[ 20 others ]
4(3.3%)
4(3.3%)
4(3.3%)
4(3.3%)
4(3.3%)
4(3.3%)
4(3.3%)
4(3.3%)
4(3.3%)
4(3.3%)
80(66.7%)
 0 (0.0%)
variety_alt [logical]
All NA's
 120 (100.0%)
variety_code [integer]
Mean (sd) : 1059153 (477496.9)
min ≤ med ≤ max:
5 ≤ 1337651 ≤ 1337667
IQR (CV) : 258041 (0.5)
 30 distinct values 0 (0.0%)
dmy_storage [numeric]
Mean (sd) : 6.3 (3.3)
min ≤ med ≤ max:
0 ≤ 6.2 ≤ 16.4
IQR (CV) : 4.6 (0.5)
 77 distinct values 0 (0.0%)
fwy_storage [integer]
Mean (sd) : 29328.3 (12880.8)
min ≤ med ≤ max:
0 ≤ 30850 ≤ 72500
IQR (CV) : 16700 (0.4)
 98 distinct values 0 (0.0%)
fwy_residue [logical]
All NA's
 120 (100.0%)
yield_part [character] 1. roots
120(100.0%)
 0 (0.0%)
yield [integer]
Mean (sd) : 29328.3 (12880.8)
min ≤ med ≤ max:
0 ≤ 30850 ≤ 72500
IQR (CV) : 16700 (0.4)
 98 distinct values 0 (0.0%)
N_fertilizer [logical]
All NA's
 120 (100.0%)
P_fertilizer [logical]
All NA's
 120 (100.0%)
K_fertilizer [logical]
All NA's
 120 (100.0%)
irrigated [logical]
All NA's
 120 (100.0%)
plot_length [logical]
All NA's
 120 (100.0%)
plot_width [logical]
All NA's
 120 (100.0%)
harvest_index [numeric]
Mean (sd) : 0.6 (0.1)
min ≤ med ≤ max:
0 ≤ 0.6 ≤ 0.8
IQR (CV) : 0.2 (0.2)
0.00:1(0.8%)
0.40:7(5.8%)
0.50:25(20.8%)
0.60:36(30.0%)
0.70:46(38.3%)
0.80:5(4.2%)
 0 (0.0%)