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Table 1 Definition of variables and summary statistics

From: Climate variability, agricultural technologies adoption, and productivity in rural Nigeria: a plot-level analysis

Variable

Definition

Mean

Std deviation

Improved seeds

1 if improved seed was planted on plot during the 2018/19 agricultural season

0.09

0.28

Inorganic fertilizer

1 if inorganic fertilizer was used on plot during the 2018/19 agricultural season

0.43

0.49

Organic fertilizer

1 if organic fertilizer was used on plot during the 2018/19 agricultural season

0.29

0.45

Legume intercropping

1 if the plot was intercropped with a leguminous crop during the 2018/19 agricultural season

0.24

0.43

Productivity

Value of crop harvest per harvested plot area (Naira/hectare)

352,254

698,189

CV of rainfall

Coefficient of variation of rainfall during the planting season (March-June), 1983–2017

0.69

0.18

CV temperature

Coefficient of variation of daily temperature during the planting season (March-June), 1983–2017

0.05

0.02

Rainfall shortfall

Average rainfall shortfall where the annual rainfall during the growing season (March-June) is less than their long-term average (1983–2017)

19.37

7.17

CV of GDD

Coefficient of variation of growing degree days during the planting season (March-June), 1983–2017

0.22

0.21

CV days temp

Coefficient of variation of number of days where temperature is greater than 34 °C during the planting season (March-June), 1983–2017

0.82

0.98

Household size

Number of persons in the household

6.80

3.62

Dependency

Share of dependents in the household

1.12

1.17

Gender

1 if the plot manager is male

0.84

0.37

Age

Age of the plot manager in years

48.09

14.20

Education

Number of years of formal education of the plot manager

6.12

4.79

Off farm

1 if the plot manger worked in a non-farm household business

0.45

0.50

Wage work

1 if the plot manger had a wage work

0.13

0.34

Credit

1 if the household had access to credit

0.12

0.32

Remittance

1 if the household received international remittance

0.02

0.13

Extension

1 if the household had access to extension services

0.20

0.40

Plot size

Plot size planted (hectares)

0.52

0.78

Harvested plot size

Plot size harvested (hectares)

0.50

0.77

Owned land

1 if the plot was owned by the household during the 2018/19 agricultural season

0.78

0.41

Erosion

1 if there is erosion control facility on plot

0.03

0.18

Steep slope

1 if farmer perceives the plot to have a steep slope

0.22

0.41

Irrigation

1 if the plot was irrigated during the 2018/2019 agricultural season

0.03

0.18

Fertilizer price

Average price of a Kg of inorganic fertilizer (NPK or urea)

152.22

89.97

Distance

Distance from homestead to nearest market (Km)

61.99

47.72

Nutrient constraint

Nutrient availability constraint (1–5 scale, 5 = mainly water)

1.74

0.81

NDVI

Long-term average NDVI (greenness) in primary growing season (highest quarter)

0.29

0.04

Distance to household

Distance from homestead to plot (Km)

1.42

5.25

Wealth index

Wealth index, including assets, dwelling characteristics, sanitation and water

 − 0.43

0.73

Agric capital index

Index of agricultural capital (implements)

0.66

1.05

TLU

Tropical livestock size of the household 12 months prior to the survey

1.54

3.48

North Central

1 if the household is located in North Central zone

0.24

0.43

North East

1 if the household is located in North East zone

0.15

0.36

North West

1 if the household is located in North West zone

0.32

0.47

South East

1 if the household is located in South East zone

0.13

0.34

South South

1 if the household is located in South South zone

0.03

0.18

South West

1 if the household is located in South West zone

0.12

0.33