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Table 3 SUR Probit estimation results of household-level determinants of adoption of major potato varieties (marginal effects and standard errors)

From: The curious case of C-88: impacts of a potato variety on farmers in Yunnan, China

 

C88

Hui-2

Weiyu-3

Mira

Xuanshu-2

Qingshu-9

Lishu-7

Others

# of working age farmers

0.0643***

(0.018)

 − 0.0112

(0.020)

0.0099

(0.014)

 − 0.0200

(0.016)

 − 0.0006

(0.017)

 − 0.0218

(0.016)

 − 0.0037

(0.013)

 − 0.0110

(0.022)

Avg. age of working age farmers

0.0028*

(0.002)

 − 0.0021

(0.002)

0.0007

(0.001)

0.0006

(0.001)

0.0008

(0.001)

0.0028**

(0.001)

0.0008

(0.001)

0.0017

(0.002)

Avg. yrs of education of working age farmers

0.0101**

(0.005)

 − 0.0231***

(0.006)

0.0099**

(0.005)

 − 0.0017

(0.005)

 − 0.0048

(0.005)

0.0036

(0.004)

0.0065**

(0.003)

0.0061

(0.006)

Dummy: 1 if a household is a member of a farmer organization

0.1323***

(0.044)

 − 0.2031***

(0.038)

 − 0.0783

(0.050)

 − 0.0981

(0.070)

 

0.1665***

(0.057)

0.0354

(0.026)

0.2893***

(0.070)

Dummy: 1 if a household is visited by extension agents in the last year

0.1117***

(0.033)

 − 0.1191***

(0.035)

0.0134

(0.031)

 − 0.0392

(0.033)

0.0000

(0.000)

0.0560*

(0.029)

 − 0.0254

(0.020)

 − 0.0286

(0.037)

Share of household farmland allocated to potato

0.0449

(0.051)

0.1785***

(0.063)

 − 0.1239*

(0.069)

 − 0.1366**

(0.061)

0.0802

(0.057)

0.1380***

(0.048)

0.0569

(0.036)

 − 0.0247

(0.064)

Household farm size (mu)

0.0018*

(0.001)

0.0000

(0.000)

 − 0.0037

(0.003)

0.0005*

(0.000)

0.0023

(0.002)

0.0005**

(0.000)

0.0008**

(0.000)

0.0007

(0.000)

Share of self-kept seed in the total quantity of potato seed

0.0379

(0.034)

0.0751**

(0.034)

 − 0.0796***

(0.027)

0.1378***

(0.025)

 − 0.0682**

(0.030)

0.0169

(0.026)

 − 0.0439*

(0.025)

0.0012

(0.039)

# of households in village

 − 0.0001

(0.000)

 − 0.0015***

(0.000)

 − 0.0003

(0.000)

0.0010***

(0.000)

0.0005***

(0.000)

0.0005***

(0.000)

 − 0.0012

(0.001)

 − 0.0001

(0.000)

Village average farm size per HH (mu)

0.0037*

(0.002)

 − 0.0038

(0.003)

 − 0.0329***

(0.010)

0.0188***

(0.004)

 − 0.0042

(0.004)

0.0051*

(0.003)

0.0153***

(0.004)

0.0002

(0.002)

Village total potato area (mu)

0.0002***

(0.000)

0.0000

(0.000)

 − 0.0002

(0.000)

 − 0.0010***

(0.000)

0.0000

(0.000)

 − 0.0004***

(0.000)

 − 0.0004***

(0.000)

0.0000

(0.000)

Dummy: 1 if village experienced serious disease problem in past 5 years

 − 0.0843**

(0.033)

0.0281

(0.040)

 − 0.1030***

(0.036)

0.1194***

(0.040)

0.0000

(0.000)

0.0047

(0.035)

 − 0.1555***

(0.025)

0.0259

(0.041)

Dummy: 1 if village experienced serious pest problem in past five years

 − 0.2890***

(0.018)

 − 0.1070***

(0.033)

0.2739***

(0.038)

0.0134

(0.030)

0.0000

(0.000)

 − 0.0811***

(0.024)

 − 0.1294***

(0.017)

 − 0.0429

(0.038)

Distance from village to city town (km)

 − 0.0010***

(0.000)

 − 0.0014***

(0.000)

0.0002

(0.000)

0.0020***

(0.000)

0.0002

(0.000)

0.0007***

(0.000)

 − 0.0017**

(0.001)

0.0000

(0.000)

Distance from village to county town (km)

0.0028***

(0.001)

0.0023***

(0.000)

 − 0.0026***

(0.001)

 − 0.0013***

(0.000)

0.0001

(0.000)

0.0013***

(0.000)

 − 0.0046**

(0.002)

 − 0.0005

(0.001)

  1. 1. Since the farm organization dummy perfectly predicts the adoption of Xuanshu-2, the variable is omitted for Xuanshu-2
  2. 2. AME: average marginal effects on the probability for a household to adopt a variety
  3. 3. Level of significance: "***" 1%; "**" 5%; "*" 10%