This report describes standardized data for “Assessment of Varieties of Cassava for underground storability in an Uniform Yield Trial (16 clones) at Oguta in 1996/97 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 (1997). Assessment of Varieties of Cassava for underground storability in an Uniform Yield Trial (16 clones) at Oguta in 1996/97 Breeding Season. International Institute of Tropical Agriculture (IITA). Not versioned. doi:10.25502/WD1B-HB34

The dataset has 78 records and 29 variables for cassava in Nigeria. The dataset has 1 treatment(s): variety.


These are the first 25 records:

records
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 yield_moisture N_fertilizer P_fertilizer K_fertilizer irrigated plot_length plot_width country location longitude latitude geo_from_source
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA30555 NA 235 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA30555 NA 235 13.1 14000 NA roots 14000 61.5 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 20.3 27000 NA roots 27000 59.2 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA4(2)1425 NA 246 22.9 20400 NA roots 20400 61.6 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA4(2)1425 NA 246 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA8100110 NA 260 19.0 42500 NA roots 42500 69.8 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA8101635 NA 266 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA8200058 NA 268 14.6 13500 NA roots 13500 67.5 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA8200661 NA 270 16.2 15000 NA roots 15000 65.7 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA8200661 NA 270 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA9001554 NA 1379 12.8 22000 NA roots 22000 63.2 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA9001554 NA 1379 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA9102312 NA 362 14.7 17000 NA roots 17000 60.3 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA9102322 NA 372 14.0 6000 NA roots 6000 62.7 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA9102324 NA 374 10.6 5500 NA roots 5500 68.3 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA9102327 NA 378 9.9 14300 NA roots 14300 66.5 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA920057 NA 390 12.4 500 NA roots 500 66.5 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA920326 NA 396 16.6 17600 NA roots 17600 67.5 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 1 cassava IITA-TMS-IBA920427 NA 404 12.9 12800 NA roots 12800 72.3 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 2 cassava IITA-TMS-IBA30555 NA 235 NA 6000 NA roots 6000 66.5 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 2 cassava IITA-TMS-IBA30572 NA 5 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 2 cassava IITA-TMS-IBA30572 NA 5 NA 15000 NA roots 15000 69.4 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 2 cassava IITA-TMS-IBA4(2)1425 NA 246 NA 2800 NA roots 2800 62.7 NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE
96uyt14storeAG 1996-04-26 1997-09-12 FALSE FALSE 2 cassava IITA-TMS-IBA4(2)1425 NA 246 NA NA NA roots NA NA NA NA NA NA NA NA Nigeria Agenbode 6.69368 7.10328 TRUE


The observations were made at 1 locations. We have coordinates for 1 of these locations.


The standardization script emits the following non-compliance warnings.

type message
NA values yield
datespan 78 harvest_date more than 366 days after planting_date

The overall quality of the dataset, given the completeness of required variables was 6.2 on a scale of 10. See the table below

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


The data are further summarized in the table below.

Variable Stats / Values Freqs (% of Valid) Graph Missing
trial_id [character] 1. 96uyt14storeAG
78(100.0%)
 0 (0.0%)
planting_date [character] 1. 1996-04-26
78(100.0%)
 0 (0.0%)
harvest_date [character] 1. 1997-09-12
78(100.0%)
 0 (0.0%)
on_farm [logical] 1. FALSE
78(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
78(100.0%)
 0 (0.0%)
rep [integer]
Mean (sd) : 2.5 (1.1)
min ≤ med ≤ max:
1 ≤ 2.5 ≤ 4
IQR (CV) : 2.5 (0.5)
1:20(25.6%)
2:19(24.4%)
3:19(24.4%)
4:20(25.6%)
 0 (0.0%)
crop [character] 1. cassava
78(100.0%)
 0 (0.0%)
variety [character]
1. IITA-TMS-IBA30572
2. IITA-TMS-IBA9001554
3. IITA-TMS-IBA30555
4. IITA-TMS-IBA4(2)1425
5. IITA-TMS-IBA8200661
6. IITA-TMS-IBA8101635
7. IITA-TMS-IBA9102327
8. IITA-TMS-IBA8100110
9. IITA-TMS-IBA8200058
10. IITA-TMS-IBA9102312
[ 6 others ]
8(10.3%)
8(10.3%)
7(9.0%)
6(7.7%)
6(7.7%)
5(6.4%)
5(6.4%)
4(5.1%)
4(5.1%)
4(5.1%)
21(26.9%)
 0 (0.0%)
variety_alt [logical]
All NA's
 78 (100.0%)
variety_code [integer]
Mean (sd) : 406 (368.7)
min ≤ med ≤ max:
5 ≤ 270 ≤ 1379
IQR (CV) : 144 (0.9)
 16 distinct values 0 (0.0%)
dmy_storage [numeric]
Mean (sd) : 15 (3.7)
min ≤ med ≤ max:
9.9 ≤ 14.3 ≤ 22.9
IQR (CV) : 3.7 (0.2)
 14 distinct values 64 (82.1%)
fwy_storage [integer]
Mean (sd) : 17517.2 (11345.3)
min ≤ med ≤ max:
500 ≤ 15500 ≤ 45000
IQR (CV) : 15000 (0.6)
 43 distinct values 20 (25.6%)
fwy_residue [logical]
All NA's
 78 (100.0%)
yield_part [character] 1. roots
78(100.0%)
 0 (0.0%)
yield [integer]
Mean (sd) : 17517.2 (11345.3)
min ≤ med ≤ max:
500 ≤ 15500 ≤ 45000
IQR (CV) : 15000 (0.6)
 43 distinct values 20 (25.6%)
yield_moisture [numeric]
Mean (sd) : 65.5 (4.2)
min ≤ med ≤ max:
57.4 ≤ 66 ≤ 77.6
IQR (CV) : 5.4 (0.1)
 47 distinct values 20 (25.6%)
N_fertilizer [logical]
All NA's
 78 (100.0%)
P_fertilizer [logical]
All NA's
 78 (100.0%)
K_fertilizer [logical]
All NA's
 78 (100.0%)
irrigated [logical]
All NA's
 78 (100.0%)
plot_length [logical]
All NA's
 78 (100.0%)
plot_width [logical]
All NA's
 78 (100.0%)
country [character] 1. Nigeria
78(100.0%)
 0 (0.0%)
location [character] 1. Agenbode
78(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. TRUE
78(100.0%)
 0 (0.0%)