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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%