This report describes standardized data for “Assessment of Varieties of Cassava for high yield, disease resistance of 237 staygreen genotypes 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 of 237 staygreen genotypes at Ibadan in 1998/99 Breeding season. International Institute of Tropical Agriculture (IITA). Not versioned. doi:10.25502/E1WA-RY87

The dataset has 237 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 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB494 NA 98104 NA NA NA roots NA NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB98 NA 97921 NA NA NA roots NA NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB1 NA 39629 NA NA NA roots NA NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB419 NA 39671 0.7 2800 NA roots 2800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava IITA-TMS-IBA4(2)1425 NA 246 8.8 22000 NA roots 22000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB536 NA 128839 1.9 4600 NA roots 4600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB399 NA 39668 0.9 2800 NA roots 2800 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB203 NA 39649 NA NA NA roots NA NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB225 NA 39653 0.7 2200 NA roots 2200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB379 NA 39666 NA NA NA roots NA NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 1 cassava IITA-TMS-IBA920429 NA 409 17.3 44600 NA roots 44600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava IITA-TMS-IBA4(2)1425 NA 246 9.4 25600 NA roots 25600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB3 NA 39664 0.7 2000 NA roots 2000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB435 NA 98083 2.2 5400 NA roots 5400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB537 NA 98123 1.6 4600 NA roots 4600 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava RB980113 NA 679048 3.0 9200 NA roots 9200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 5 cassava TMEB479 NA 98099 3.1 9000 NA roots 9000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 6 cassava TMEB408 NA 97516 2.1 7400 NA roots 7400 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 6 cassava TMEB426 NA 98076 2.1 5000 NA roots 5000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 6 cassava TMEB282 NA 39660 0.4 1200 NA roots 1200 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 6 cassava TMEB452 NA 701775 0.2 1500 NA roots 1500 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 1 cassava IITA-TMS-BAD930066 NA 1433093 2.0 6000 NA roots 6000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 6 cassava TMEB288 NA 98042 1.9 6000 NA roots 6000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 6 cassava IITA-TMS-IBA4(2)1425 NA 246 11.4 30000 NA roots 30000 NA NA NA NA NA NA
Nigeria Ibadan 3.94704 7.37754 TRUE 98SG237IB 1998-03-05 1999-06-07 FALSE FALSE 6 cassava TMEB278 NA 98618 4.3 10000 NA roots 10000 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
fwy_storage (1200, 66600)
237 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
237(100.0%)
 0 (0.0%)
location [character] 1. Ibadan
237(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. TRUE
237(100.0%)
 0 (0.0%)
trial_id [character] 1. 98SG237IB
237(100.0%)
 0 (0.0%)
planting_date [character] 1. 1998-03-05
237(100.0%)
 0 (0.0%)
harvest_date [character] 1. 1999-06-07
237(100.0%)
 0 (0.0%)
on_farm [logical] 1. FALSE
237(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
237(100.0%)
 0 (0.0%)
rep [integer]
Mean (sd) : 5.9 (3.5)
min ≤ med ≤ max:
1 ≤ 6 ≤ 12
IQR (CV) : 6 (0.6)
 12 distinct values 0 (0.0%)
crop [character] 1. cassava
237(100.0%)
 0 (0.0%)
variety [character]
1. IITA-TMS-IBA4(2)1425
2. IITA-TMS-IBA960016
3. IITA-TMS-IBA960054
4. IITA-TMS-IBA960532
5. IITA-TMS-IBA960574
6. IITA-TMS-IBA960603
7. IITA-TMS-IBA961630
8. IITA-TMS-IBA961667
9. TMEB1
10. TMEB239
[ 205 others ]
12(5.1%)
2(0.8%)
2(0.8%)
2(0.8%)
2(0.8%)
2(0.8%)
2(0.8%)
2(0.8%)
2(0.8%)
2(0.8%)
207(87.3%)
 0 (0.0%)
variety_alt [logical]
All NA's
 237 (100.0%)
variety_code [integer]
Mean (sd) : 371024.9 (498194.5)
min ≤ med ≤ max:
9 ≤ 97518 ≤ 1548666
IQR (CV) : 801952 (1.3)
 215 distinct values 0 (0.0%)
dmy_storage [numeric]
Mean (sd) : 5.4 (4.7)
min ≤ med ≤ max:
0.2 ≤ 4.2 ≤ 24.6
IQR (CV) : 6.2 (0.9)
 97 distinct values 37 (15.6%)
fwy_storage [integer]
Mean (sd) : 16319.9 (13900)
min ≤ med ≤ max:
1200 ≤ 13200 ≤ 66600
IQR (CV) : 18400 (0.9)
 120 distinct values 36 (15.2%)
fwy_residue [logical]
All NA's
 237 (100.0%)
yield_part [character] 1. roots
237(100.0%)
 0 (0.0%)
yield [integer]
Mean (sd) : 16319.9 (13900)
min ≤ med ≤ max:
1200 ≤ 13200 ≤ 66600
IQR (CV) : 18400 (0.9)
 120 distinct values 36 (15.2%)
N_fertilizer [logical]
All NA's
 237 (100.0%)
P_fertilizer [logical]
All NA's
 237 (100.0%)
K_fertilizer [logical]
All NA's
 237 (100.0%)
irrigated [logical]
All NA's
 237 (100.0%)
plot_length [logical]
All NA's
 237 (100.0%)
plot_width [logical]
All NA's
 237 (100.0%)