Analysis on Scientific and Technological Innovation of Grain Production in Henan Province Based on SD-GM Approach
Table 1
Main equations and parameters of system model.
Variable
Equation and logical relation
Grain output
Grain output = grain output per hectare Sown area of grain/10,000
Cultivated land area
Cultivated land area = INTEG (Increase of cultivated land area − Decrease of cultivated land area, 8177.45)
Increase of cultivated land area
Increase of cultivated land area = max ((Cultivated land safety baseline − Cultivated land area) Cultivated land area increasing factor Self − sufficiency rate adjustment factor, 0)
Decrease of cultivated land area
Decrease of cultivated land area = Cultivated land area Cultivated land area reduction factor
Sown area of grain
Sown area of grain = Cultivated land area Multiple cropping index
Output ability index
Output ability index = EXP(7.08254) Man-machine dynamic index ^ (0.117228) Fertilizer input per hectare ^ (1.12496) Pesticide input per hectare ^ (−1.2333) Expenditures input per hectare ^ (−0.179951)
Man-machine dynamic index
Man-machine dynamic index = Personnel per hectare Agricultural machinery power per hectare Sex ratio
Personnel per hectare
Personnel per hectare = PSTIGP/(Sown area of grain 1000)
Amount of change of personnel
Amount of change of personnel = IF THEN ELSE(Time = 2010, 2309, (1 − EXP (0.124)) (2309 − 1023.53/0.124) Personnel adjustment factor Self-sufficiency rate adjustment factor EXP (−0.124 (Time-2010)) Protection factors of agricultural scientific and technological innovation personnel policy)
Agricultural machinery power per hectare
Agricultural machinery power per hectare = Agricultural machinery power 10/Sown area of grain Influencing factors of comprehensive agricultural subsidy policy
Fertilizer input per hectare
Fertilizer input per hectare = Fertilizer input/Sown area of grain 100 Influencing factors of comprehensive agricultural subsidy policy
Pesticide input per hectare
Pesticide input per hectare = Pesticide input/Sown area of grain 1000 Influencing factors of comprehensive agricultural subsidy policy
Expenditures input per hectare
Expenditures input per hectare = ESTIGP/(sown area of grain 100)
Amount of change in expenditures
Amount of change in expenditures = IF THEN ELSE(Time = 2010, 54691.6, ESTIGP (1 + 0.0344972 Self-sufficiency rate adjustment factor) Adjustment factor of expenditures)
