保护性耕作技术、种植制度与土地生产率——来自黄土高原农户的证据
李卫, 薛彩霞, 姚顺波, 朱瑞祥

Conservation tillage,cropping systems and land productivity for households on the Loess Plateau
Wei LI, Caixia XUE, Shunbo YAO, Ruixiang ZHU
表3 保护性耕作技术对土地生产率影响的估计结果
Table 3 Estimation results of the effects of conservation tillage on land productivity
土地生产率 变量 全部农户 一年一熟制农户 一年两熟制农户 两年三熟制农户
顷均产量 保护性耕作技术 0.027 3
(0.018 5)
0.013 1**
(0.006 5)
0.032 1**
(0.015 1)
0.062 3
(0.044 3)
常数项 6.851 7***
(0.233 9)
6.666 7***
(1.929 2)
1.830 2
(1.231 2)
2.398 8***
(0.797 0)
R2 0.762 5 0.691 6 0.653 6 0.685 4
F 136.05 124.17 105.77 71.56
顷均利润1 保护性耕作技术 52.947 6
(37.868 2)
28.786 8
(24.363 6)
51.059 7**
(22.562 7)
39.657 4*
(20.990 7)
常数项 249.792 0***
(77.096 4)
410.873 3*
(225.587 1)
264.471 0***
(87.128 7)
288.352 0
(259.711 3)
R2 0.665 9 0.803 4 0.726 1 0.786 7
F 49.96 39.62 88.84 36.23
顷均利润2 保护性耕作技术 47.274 8
(56.345 5)
62.779 2
(39.872 1)
69.843 7**
(28.022 9)
50.525 3*
(26.600 3)
常数项 146.692 0**
(57.835 7)
59.484 7
(60.217 2)
76.695 0*
(46.835 7)
80.754 9
(53.591 5)
R2 0.654 2 0.640 8 0.690 2 0.776 1
F 91.20 75.15 115.30 29.85