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Fig. 2. Trend value of mechanical sowing from 1973 to 2008
Fig. 3. Trend value of mechanical harvesting from 1973 to 2008
Sowing
level
Harve-
sting level
Sowing
level
Harvesting
level
Sowing
level
Harvesting
level
Years
Years
Years
1973
7.14
8.64
1985
0.90
-0.49
1997
-0.95
0.82
1974
-6.92
-1.20
1986
-7.45
-13.79
1998
3.13
0.89
1975
-7.32
-4.03
1987
0.93
-0.75
1999
3.11
1.57
1976
0.92
-2.41
1988
-1.19
2.63
2000
0.96
7.43
1977
-6.62
-8.11
1989
-0.99
-1.39
2001
-0.17
1.07
1978
1.32
-5.06
1990
0.17
1.37
2002
-0.49
-1.59
1979
9.62
5.09
1991
3.92
-0.36
2003
-3.45
-3.41
1980
11.25
14.79
1992
3.55
4.25
2004
-0.38
-3.59
1981
-0.30
-5.80
1993
-0.56
1.21
2005
-0.62
-2.13
1982
-0.79
6.29
1994
-1.82
-0.39
2006
-0.81
-0.89
1983
-4.56
1.73
1995
-2.00
-3.00
2007
-0.09
2.15
1984
-5.93
-0.42
1996
-1.16
-4.35
2008
1.97
1.66
Table 2. RV value of agricultural mechanization operation level from 1973 to 2008 in China
(%)
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