This report describes standardized data for “Assessment of Varieties of Cassava for high yield, disease resistance in a Advanced Yield Trial (198 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 Advanced Yield Trial (198 clones) at Ibadan in 1998/99 Breeding Season. International Institute of Tropical Agriculture (IITA). Not versioned. doi:10.25502/4RV6-DX05

The dataset has 501 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 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 4.8 13500 NA roots 13500 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 6.4 17600 NA roots 17600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 3.9 11600 NA roots 11600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 3.0 9000 NA roots 9000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 4.3 13600 NA roots 13600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 7.9 23000 NA roots 23000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 2.9 7600 NA roots 7600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 5.8 16200 NA roots 16200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 5.1 16000 NA roots 16000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 5.5 16400 NA roots 16400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 6.9 19200 NA roots 19200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 4.1 11800 NA roots 11800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 3.7 11700 NA roots 11700 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 2.9 8600 NA roots 8600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 7.2 22200 NA roots 22200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 2.1 6200 NA roots 6200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 6.5 18600 NA roots 18600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 4.2 12200 NA roots 12200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 6.1 18200 NA roots 18200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 4.9 14400 NA roots 14400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 6.5 20400 NA roots 20400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 6.7 17400 NA roots 17400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 3.5 10000 NA roots 10000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 6.5 21400 NA roots 21400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98ayt198IB 1998-08-25 1999-07-26 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 3.5 10600 NA roots 10600 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

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
501(100.0%)
 0 (0.0%)
location [character] 1. Ibadan
501(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. TRUE
501(100.0%)
 0 (0.0%)
trial_id [character] 1. 98ayt198IB
501(100.0%)
 0 (0.0%)
planting_date [character] 1. 1998-08-25
501(100.0%)
 0 (0.0%)
harvest_date [character] 1. 1999-07-26
501(100.0%)
 0 (0.0%)
on_farm [logical] 1. FALSE
501(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
501(100.0%)
 0 (0.0%)
rep [integer]
Mean (sd) : 2 (1)
min ≤ med ≤ max:
1 ≤ 2 ≤ 4
IQR (CV) : 2 (0.5)
1:197(39.3%)
2:171(34.1%)
3:89(17.8%)
4:44(8.8%)
 0 (0.0%)
crop [character] 1. cassava
501(100.0%)
 0 (0.0%)
variety [character]
1. IITA-TMS-IBA30572
2. IITA-TMS-IBA9102324
3. IITA-TMS-IBA980016
4. IITA-TMS-IBA980027
5. IITA-TMS-IBA980031
6. IITA-TMS-IBA980094
7. IITA-TMS-IBA980119
8. IITA-TMS-IBA980132
9. IITA-TMS-IBA980155
10. IITA-TMS-IBA980160
[ 163 others ]
33(6.6%)
33(6.6%)
4(0.8%)
4(0.8%)
4(0.8%)
4(0.8%)
4(0.8%)
4(0.8%)
4(0.8%)
4(0.8%)
403(80.4%)
 0 (0.0%)
variety_alt [logical]
All NA's
 501 (100.0%)
variety_code [integer]
Mean (sd) : 1208885 (604967.4)
min ≤ med ≤ max:
5 ≤ 1545198 ≤ 1545299
IQR (CV) : 328786 (0.5)
 173 distinct values 0 (0.0%)
dmy_storage [numeric]
Mean (sd) : 3.9 (2.2)
min ≤ med ≤ max:
0.1 ≤ 3.7 ≤ 10.8
IQR (CV) : 2.7 (0.6)
 90 distinct values 135 (26.9%)
fwy_storage [integer]
Mean (sd) : 11399.2 (6723.9)
min ≤ med ≤ max:
300 ≤ 10800 ≤ 33900
IQR (CV) : 9300 (0.6)
 182 distinct values 116 (23.2%)
fwy_residue [logical]
All NA's
 501 (100.0%)
yield_part [character] 1. roots
501(100.0%)
 0 (0.0%)
yield [integer]
Mean (sd) : 11399.2 (6723.9)
min ≤ med ≤ max:
300 ≤ 10800 ≤ 33900
IQR (CV) : 9300 (0.6)
 182 distinct values 116 (23.2%)
N_fertilizer [logical]
All NA's
 501 (100.0%)
P_fertilizer [logical]
All NA's
 501 (100.0%)
K_fertilizer [logical]
All NA's
 501 (100.0%)
irrigated [logical]
All NA's
 501 (100.0%)
plot_length [logical]
All NA's
 501 (100.0%)
plot_width [logical]
All NA's
 501 (100.0%)