to the California Institute of Technology Irrigation Training Research Center
of the research and analysis, the use of drip fertilization under normal
circumstances can save 25% of fertilizer, saving labor and mechanical energy
development of agriculture water-saving can’t be separate from advanced
equipments. In order to develop the benefit Water-saving irrigation technology,
United States, Australia and Israel are more developed countries and paying
attention to new products research and developments and constantly improve the
properties to introduce a new products and paying attention to the advancement
and matching of the Irrigation system at the same time.
china with other developed countries, still there was a big gap in the level of
modern irrigation technology. And one of the main problems is the backward
development of irrigation preparation research and the backward of production
technology. At present, China have main companies of drip irrigation equipment such
as Shaanxi Yangling Qinchuan water saving irrigation equipment company,
Xinjiang Tianye company, Gansu Da Yu Xinjiang Karez water-saving irrigation
equipment company, Hebei Longda water-saving irrigation equipment company,
Shandong Laiwu company, Beijing Luyuan company and a other few compan, the
specifications of irrigation products the produce in china are relatively less
than foreign countries products, matching level was low, besides quality of
products had not stability of foreigner products. And the, comprehensive
analysis showed that the qualified rate of water-saving irrigation products in
China was only about 60% 27.
were 4 main reasons of this situation
Companies with small production capacity, outdated
equipments and modest level of production technology.
Equipment key technologies were protected or secret by
patent of each country research and development capability of irrigation
componies was not seriously deficient and weak technical capacity.
The development of new products and new technologies
was not enough.
Quality inspection system and standard system was not
perfect (8, 9)2.
more and more technologically advanced foreign irrigation companies such as
(Israel, NATEFIM and MAZZEl INJETOR Companies and the United States
RAINBIRD and NELSON Companies etc.) China establishment of offices and
factories had a strong impacted on the domestic irrigation market. Therefore,
domestic manufacturers of irrigation equipment should follow the foreigner
technologies of the modern world and actively introduce, digest, absorb and
industrialize the water-saving irrigation equipment. The development of a new
generation of irrigation products and equipment suitable for China national
conditions was of great significance for narrowing the gap between China
irrigation technology and foreign countries and promoting the development of
water-saving irrigation in China. 28.
In this research, the concentration of Venturi fertilizer will
test to find out the good result and suitable control method by adjusting the
valves in three parts of Venturi injector (import, export and fertilizer
suction) under low pressure irrigation system.
Low pressure drip irrigation system doesn’t mean that the pressure
is absolutely low, but need to consider the ground topography and the
scientific value of working pressure when designing the system.
Using low-pressure drip irrigation technology can be used in gravity
irrigation or drip irrigation according to topography of the landform and especially suitable for mountain landform using
applicators without power supply. (????? ?????)