Wheat Production: Economics and energy flow E6
Li, Z. ; Tai, C. ; Wang, Q. & Xi, Y.
Organic Food Development Center of China NEPA, Box 4202, Nangjing 210042 China
|In order to provide techniques and scientific
evidents of yield, economy, energy, disease and pest, and soil property for the convertion
of inorganic wheat production system to organic farming system, this 2-year on-farm study
has been conducted. The results show that the 2 years' yields in organic system were 11.3%
and 11.9% respectively higher than those in inorganic system and economic inputs and
outputs were 14.6%, 25.0% and 11.3%, 11.9% higher too in organic system. As to the
economic O/I ratios, in the first year, they were similar in the two systems (1.35,
organic; 1.39, inorganic) and in the second year, it's 11.0% lower in organic system
(1.25, organic; 1.40, inorganic). The higher economic input in organic system resulted
from more labour input. In the first year, the energy O/I ratio in organic system was
31.0% higher (6.34, organic; 4.85, inorganic) and in the second year, they were similar in
the two systems (6.63, organic; 6.85, inorganic). Among energy inputs, the energy in
fertilizer constituted the majority, so applying different kinds of fertilizer and whether
the fertilizer utilization is reasonable or not will affect the result of energy O/I ratio
in the two systems. Soil microbiomasses were higher in organic system, specially the
bacteria number. Disease and pest were not serious in the two systems, the main pest was
aphid (Rhopalosiphum padi) and only a few black ears (caused by Tilletia foetida, liro)
Qiming, Z. (1991): The high yield technique for wheat production. Beijing, Jingdun publisher.
Dazhong, W. (1985): The research method of energy flow in agroecosystems (1). Rural Eco-environment, 4, 47-52.
Dazhong, W. (1986): The research method of energy flow in agroecosystems (2). Rural Eco-environment, 1, 52-56.