This report describes standardized data for “Conservation Agriculture Long-Term Trial at Msekera Research Station, Zambia”. These data were standardized on 2024-01-16 by Fredy Chimire with this R script. The original data have a CC-BY-4.0 license. Here you can download the standardized data.

This is the full citation of the data set:

International Maize and Wheat Improvement Center (CIMMYT)); Zambian Agriculture Research Institute (ZARI) (2021). Conservation Agriculture Long-Term Trial at Msekera Research Station, Zambia. Harvard Dataverse. Version 1.2. doi:10.7910/DVN/Z7M0AV

The dataset has 396 records and 24 variables for 3 crops (cowpea, maize, soybean) in Zambia.


These are the first 25 records:

records
trial_id planting_date on_farm is_survey treatment rep crop dmy_total yield_part yield yield_moisture fertilizer_type N_fertilizer P_fertilizer K_fertilizer irrigated country adm2 location longitude latitude geo_from_source
1 2012 FALSE FALSE CPM1 1 maize 3194 grain 3746 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE CPM1 2 maize 3229 grain 4214 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE CPM1 3 maize 2478 grain 3796 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE CPM1 4 maize 3530 grain 4231 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE CPM2 1 maize 2637 grain 3833 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE CPM2 2 maize 1750 grain 3605 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE CPM2 3 maize 3101 grain 1744 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE CPM2 4 maize 3834 grain 5454 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DISM 1 maize 1786 grain 4917 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE BAM 2 maize 2128 grain 4315 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE BAM 3 maize 2755 grain 7158 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE BAM 4 maize 3056 grain 4310 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DISM 1 maize 2445 grain 3653 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DISM 2 maize 4090 grain 6206 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DISM 3 maize 3142 grain 2105 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DISM 4 maize 2915 grain 4082 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DSM 1 maize 2029 grain 3506 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DSM 2 maize 2589 grain 3902 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DSM 3 maize 3123 grain 2169 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DSM 4 maize 3558 grain 5595 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DS-M/C 1 maize 1846 grain 2388 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DS-M/C 2 maize 2646 grain 5110 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DS-M/C 3 maize 3402 grain 3523 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DS-M/C 4 maize 2170 grain 3609 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE
1 2012 FALSE FALSE DS-CM 1 maize 1994 grain 3241 NA NPK;urea 108.5 33 16.5 FALSE Zambia Chipata Msekera 32.6447 -13.64451 FALSE


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
metadata treatment is not a variable in the data: land_prep_method
yield_isfresh yield_isfresh must be set to TRUE or NA if yield_moisture is NA

The overall quality of the dataset, given the completeness of required variables was 6.9 on a scale of 10. See the table below

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


The data are further summarized in the table below.

Variable Stats / Values Freqs (% of Valid) Graph Missing
trial_id [integer] 1 distinct value
1:396(100.0%)
 0 (0.0%)
planting_date [integer]
Mean (sd) : 2016 (2.6)
min ≤ med ≤ max:
2012 ≤ 2016 ≤ 2020
IQR (CV) : 4 (0)
2012:44(11.1%)
2013:44(11.1%)
2014:44(11.1%)
2015:44(11.1%)
2016:44(11.1%)
2017:44(11.1%)
2018:44(11.1%)
2019:44(11.1%)
2020:44(11.1%)
 0 (0.0%)
on_farm [logical] 1. FALSE
396(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
396(100.0%)
 0 (0.0%)
treatment [character]
1. BAM
2. CPM1
3. CPM2
4. DISM
5. DS-CM
6. DS-M/C
7. DS-SM
8. DSM
27(6.8%)
36(9.1%)
36(9.1%)
45(11.4%)
72(18.2%)
72(18.2%)
72(18.2%)
36(9.1%)
 0 (0.0%)
rep [integer]
Mean (sd) : 2.5 (1.1)
min ≤ med ≤ max:
1 ≤ 2.5 ≤ 4
IQR (CV) : 1.5 (0.4)
1:99(25.0%)
2:99(25.0%)
3:99(25.0%)
4:99(25.0%)
 0 (0.0%)
crop [character]
1. cowpea
2. maize
3. soybean
72(18.2%)
288(72.7%)
36(9.1%)
 0 (0.0%)
dmy_total [integer]
Mean (sd) : 2689.2 (1632.3)
min ≤ med ≤ max:
0 ≤ 2608 ≤ 9814
IQR (CV) : 2303.5 (0.6)
 344 distinct values 4 (1.0%)
yield_part [character] 1. grain
396(100.0%)
 0 (0.0%)
yield [integer]
Mean (sd) : 2927.5 (1672.2)
min ≤ med ≤ max:
0 ≤ 3001.5 ≤ 7872
IQR (CV) : 2335.8 (0.6)
 357 distinct values 0 (0.0%)
yield_moisture [logical]
All NA's
 396 (100.0%)
fertilizer_type [character]
1. NPK
2. NPK;urea
108(27.3%)
288(72.7%)
 0 (0.0%)
N_fertilizer [numeric]
Min : 16.5
Mean : 83.4
Max : 108.5
16.50:108(27.3%)
108.50:288(72.7%)
 0 (0.0%)
P_fertilizer [integer] 1 distinct value
33:396(100.0%)
 0 (0.0%)
K_fertilizer [numeric] 1 distinct value
16.50:396(100.0%)
 0 (0.0%)
irrigated [logical] 1. FALSE
396(100.0%)
 0 (0.0%)
country [character] 1. Zambia
396(100.0%)
 0 (0.0%)
adm2 [character] 1. Chipata
396(100.0%)
 0 (0.0%)
location [character] 1. Msekera
396(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. FALSE
396(100.0%)
 0 (0.0%)