This report describes standardized data for “Cowpea Yield Evaluation Trials - Ogongo, 1992.”. These data were standardized on 2024-09-20 by Robert Hijmans with this R script. The original data are available here under a CC-BY license.

This is the full citation of the data set:

Boukar, Ousmane; Christian Fatokun (1992). Cowpea Yield Evaluation Trials - Ogongo, 1992. International Institute of Tropical Agriculture (IITA). doi:10.25502/20180920/1503/BO

The dataset has 40 records and 21 variables for cowpea in Namibia.


These are the first 25 records:

records
dataset_id trial_id record_id country location longitude latitude geo_from_source planting_date harvest_date on_farm is_survey rep crop variety yield_part yield N_fertilizer P_fertilizer K_fertilizer irrigated
doi_10.25502_20180920_1503_BO CIT59226 1 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT87D-272 seed 347.0694 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 2 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT87D-453-2 seed 850.0033 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 3 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT87D-551-1 seed 754.9843 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 4 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT86D-721 seed 1081.3820 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 5 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT85F-958 seed 1347.2690 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 6 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT87D-1931 seed 1152.5630 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 7 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT85D-3850-2 seed 593.4520 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 8 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea TVX1948-01F seed 1478.1281 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 9 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea IT87D-555-6 seed 1283.0890 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 10 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 1 cowpea LOCALCHECK seed 513.1026 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 11 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT87D-272 seed 1188.5710 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 12 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT85D-3850-2 seed 423.9181 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 13 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea LOCALCHECK seed 328.0656 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 14 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT87D-1931 seed 1325.4310 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 15 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT85F-958 seed 1084.5500 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 16 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT86D-721 seed 574.1148 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 17 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT87D-453-2 seed 1613.6560 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 18 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea TVX1948-01F seed 884.5102 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 19 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT87D-551-1 seed 686.1372 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 20 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 2 cowpea IT87D-555-6 seed 980.0293 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 21 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 3 cowpea IT87D-555-6 seed 1169.9000 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 22 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 3 cowpea IT86D-721 seed 1433.6200 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 23 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 3 cowpea IT87D-1931 seed 1221.2440 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 24 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 3 cowpea TVX1948-01F seed 1086.5500 NA NA NA NA
doi_10.25502_20180920_1503_BO CIT59226 25 Namibia Ogongo 15.29409 -17.67718 TRUE 1992-05-05 1992-12-04 FALSE FALSE 3 cowpea IT87D-272 seed 1060.7120 NA NA NA NA


The dataset has 10 treatments:

treatments
variety
IT85D-3850-2
IT85F-958
IT86D-721
IT87D-1931
IT87D-272
IT87D-453-2
IT87D-551-1
IT87D-555-6
LOCALCHECK
TVX1948-01F

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


The data are further summarized in the table below

Variable Stats / Values Freqs (% of Valid) Graph Missing
dataset_id [character] 1. doi_10.25502_2018092
40(100.0%)
 0 (0.0%)
trial_id [character] 1. CIT59226
40(100.0%)
 0 (0.0%)
record_id [integer]
Mean (sd) : 20.5 (11.7)
min ≤ med ≤ max:
1 ≤ 20.5 ≤ 40
IQR (CV) : 19.5 (0.6)
 40 distinct values (Integer sequence) 0 (0.0%)
country [character] 1. Namibia
40(100.0%)
 0 (0.0%)
location [character] 1. Ogongo
40(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. TRUE
40(100.0%)
 0 (0.0%)
planting_date [character] 1. 1992-05-05
40(100.0%)
 0 (0.0%)
harvest_date [character] 1. 1992-12-04
40(100.0%)
 0 (0.0%)
on_farm [logical] 1. FALSE
40(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
40(100.0%)
 0 (0.0%)
rep [integer]
Mean (sd) : 2.5 (1.1)
min ≤ med ≤ max:
1 ≤ 2.5 ≤ 4
IQR (CV) : 1.5 (0.5)
1:10(25.0%)
2:10(25.0%)
3:10(25.0%)
4:10(25.0%)
 0 (0.0%)
crop [character] 1. cowpea
40(100.0%)
 0 (0.0%)
variety [character]
1. IT85D-3850-2
2. IT85F-958
3. IT86D-721
4. IT87D-1931
5. IT87D-272
6. IT87D-453-2
7. IT87D-551-1
8. IT87D-555-6
9. LOCALCHECK
10. TVX1948-01F
4(10.0%)
4(10.0%)
4(10.0%)
4(10.0%)
4(10.0%)
4(10.0%)
4(10.0%)
4(10.0%)
4(10.0%)
4(10.0%)
 0 (0.0%)
yield_part [character] 1. seed
40(100.0%)
 0 (0.0%)
yield [numeric]
Mean (sd) : 916.6 (369.8)
min ≤ med ≤ max:
328.1 ≤ 932.3 ≤ 1613.7
IQR (CV) : 650.3 (0.4)
 40 distinct values 0 (0.0%)
N_fertilizer [logical]
All NA's
 40 (100.0%)
P_fertilizer [logical]
All NA's
 40 (100.0%)
K_fertilizer [logical]
All NA's
 40 (100.0%)
irrigated [logical]
All NA's
 40 (100.0%)