Table 5 Estimates of Cobb-Douglas stochastic frontier

 Farm size

0.625***

0.06

0.000

 Hired labor

− 0.103***

0.026

0.000

 Family labor

0.098**

0.045

0.031

 Seed

0.470***

0.055

0.000

 Chemical

0.189***

0.035

0.000

 Fertilizer

0.003

0.031

0.928

 Adaptation

0.150***

0.048

0.002

 Constant

3.706

0.115

0.000

 Planting date

3.345

2.18

0.125

 Early maturing variety

1.679

1.101

0.127

 Drought-resistant variety

3.573**

1.778

0.044

 Crop rotation

− 4.959**

2.139

0.02

 Land rotation

1.124

1.009

0.265

 Mixed farming

0.382

1.024

0.709

 Intercropping

0.956

0.895

0.285

 Refilling

− 0.324

0.799

0.685

 CA

1.911**

0.931

0.04

 ISFM

2.846**

1.379

0.039

 Mulching

2.689*

1.6

0.093

 Row planting

− 4.752**

1.956

0.015

 IPM

− 1.759

1.356

0.194

 Contour farming

− 0.479

1.084

0.658

 Age

0.063

0.046

0.174

 Education

0.213**

0.103

0.039

 Home-farm

0.329

0.207

0.113

 Extension

− 1.399

1.075

0.193

 Farmer groups

− 2.993*

1.655

0.071

 Credit access

2.006

1.41

0.155

 Constant

− 13.44

5.729

0.019

 Sigma (v)

0.593

0.017

 RTS

1.431