This report describes standardized data for “Assessment of Varieties of Cassava for high yield, disease resistance in a Preliminary Yield Trial (383 clones) at Ibadan in 1998/99 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 (1999). Assessment of Varieties of Cassava for high yield, disease resistance in a Preliminary Yield Trial (383 clones) at Ibadan in 1998/99 Breeding Season. International Institute of Tropical Agriculture (IITA). Not versioned. doi:10.25502/DAKC-EP93

The dataset has 749 records and 28 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
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 3.9 11200 NA roots 11200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 1.2 3600 NA roots 3600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 3.2 10000 NA roots 10000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 6.0 17200 NA roots 17200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 2.1 6000 NA roots 6000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 7.4 22800 NA roots 22800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 1.6 17800 NA roots 17800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 8.2 24800 NA roots 24800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 5.9 18400 NA roots 18400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 7.5 21200 NA roots 21200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 7.8 20800 NA roots 20800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 4.0 12000 NA roots 12000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 1.6 5200 NA roots 5200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 5.0 15200 NA roots 15200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 4.0 11200 NA roots 11200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 6.5 22000 NA roots 22000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 2.7 7600 NA roots 7600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 5.0 16000 NA roots 16000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 8.3 23200 NA roots 23200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 4.5 14000 NA roots 14000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 5.8 16800 NA roots 16800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 3.8 10000 NA roots 10000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 8.2 25200 NA roots 25200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 1.6 6000 NA roots 6000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98pyt383IB 1998-06-30 1999-07-07 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 4.1 12000 NA roots 12000 NA NA NA NA NA NA


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


The standardization script emits the following non-compliance warnings.

message
yield
yield (400, 196000), fwy_storage (400, 196000)
749 harvest_date more than 366 days after planting_date
cassava: 196000

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
749(100.0%)
 0 (0.0%)
location [character] 1. Ibadan
749(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. TRUE
749(100.0%)
 0 (0.0%)
trial_id [character] 1. 98pyt383IB
749(100.0%)
 0 (0.0%)
planting_date [character] 1. 1998-06-30
749(100.0%)
 0 (0.0%)
harvest_date [character] 1. 1999-07-07
749(100.0%)
 0 (0.0%)
on_farm [logical] 1. FALSE
749(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
749(100.0%)
 0 (0.0%)
rep [integer]
Min : 1
Mean : 1.5
Max : 2
1:383(51.1%)
2:366(48.9%)
 0 (0.0%)
crop [character] 1. cassava
749(100.0%)
 0 (0.0%)
variety [character]
1. TMEB1
2. IITA-TMS-IBA30572
3. IITA-TMS-IBA9102324
4. IITA-TMS-IBA972351
5. IITA-TMS-IBA971074
6. IITA-TMS-IBA971075
7. IITA-TMS-IBA971076
8. IITA-TMS-IBA971113
9. IITA-TMS-IBA971146
10. IITA-TMS-IBA971147
[ 331 others ]
43(5.7%)
42(5.6%)
42(5.6%)
3(0.4%)
2(0.3%)
2(0.3%)
2(0.3%)
2(0.3%)
2(0.3%)
2(0.3%)
607(81.0%)
 0 (0.0%)
variety_alt [logical]
All NA's
 749 (100.0%)
variety_code [integer]
Mean (sd) : 891162.4 (463419.5)
min ≤ med ≤ max:
5 ≤ 1195443 ≤ 1200867
IQR (CV) : 386165 (0.5)
 341 distinct values 0 (0.0%)
dmy_storage [numeric]
Mean (sd) : 6.7 (5)
min ≤ med ≤ max:
0 ≤ 6.2 ≤ 72.5
IQR (CV) : 4.8 (0.7)
 144 distinct values 9 (1.2%)
fwy_storage [integer]
Mean (sd) : 20374.9 (13888.1)
min ≤ med ≤ max:
400 ≤ 18400 ≤ 196000
IQR (CV) : 14400 (0.7)
 124 distinct values 9 (1.2%)
fwy_residue [logical]
All NA's
 749 (100.0%)
yield_part [character] 1. roots
749(100.0%)
 0 (0.0%)
yield [integer]
Mean (sd) : 20374.9 (13888.1)
min ≤ med ≤ max:
400 ≤ 18400 ≤ 196000
IQR (CV) : 14400 (0.7)
 124 distinct values 9 (1.2%)
N_fertilizer [logical]
All NA's
 749 (100.0%)
P_fertilizer [logical]
All NA's
 749 (100.0%)
K_fertilizer [logical]
All NA's
 749 (100.0%)
irrigated [logical]
All NA's
 749 (100.0%)
plot_length [logical]
All NA's
 749 (100.0%)
plot_width [logical]
All NA's
 749 (100.0%)