Three New Water Saving Irrigation Technologies

Home » Technical Support » Three New Water Saving Irrigation Technologies

Wastewater Spray Irrigation Technology
The wastewater spray irrigation is water saving and it is a method of sewage disposal that is combined with agricultural water. When the wastewater is sprayed in the farmland, the soil, microorganism and crops will decompose some ingredients of the sewage. Some of the ingredients will turn to water vapor spreading in to the air, yet some will be purified by the soil and permeate into the soil to be used again. With this irrigation technology, the sewage should be treated with precipitation, screening, solid waste removing, even adding sanitizer. Moreover, the crops irrigated with sewage are mainly economic plants except vegetables. As for the grain crops, it is better to irrigate them with sewage only at the early growth stage and the wastewater irrigation should be stopped for a certain time before the harvest. In addition, this technology is suitable for sandy loam, loam or loamy sand soil. Determined by crops and their growing periods, the amount of irrigation water will be reduced in the stage of seeding, early spring and late autumn. Large irrigation with wastewater will cause surface and underground runoff. So the irrigation intensity should be regulated to prevent the stick soil and surface runoff.

Salt Water Irrigation Technology
This salt water irrigation contains mixing and rotation irrigation with different water, even salt groundwater irrigation according to electric osmosis principle. Using different water, the mixing irrigation includes salt and fresh water type, salt and low mineralization alkaline water type and two kinds of salt water with different salinity. It aims to reduce the gross salinity of the irrigation water or change its salt composition. This technology not only improves the quality of the irrigation water, but also increases the amount of available irrigation water as it makes use of the alkaline water or water with high salinity that are not used before. The rotation irrigation is to use salt and fresh water interchangeably according to the distribution of water source, crops types and their ability of resisting salt, as well as their growing stages. For examples, salt water is available for dry seasons, strong salt-tolerant crops like cotton, the middle and late growing stages. Yet the fresh water is used for weak salt-tolerant crops like wheat, corn and soybean. After rain, the river can be used as fresh water, which is also used before planting and seeding stages of the crops. Therefore, this rotation irrigation makes full use of salt and fresh water effectively.

Irrigation with Moisture in the Air
Irrigation with moisture in the air is accomplished with certain devices to collect the moisture in the air to crops directly or to the impounding reservoir for irrigation. The German researchers collect the moisture in the air with a cylinder, whose inner wall is coated with printing to absorbing the heat of sunlight and which is connected with many nozzle tubes buried on the root segment between two lines. In the daytime, the heated air flows through the cylinder into the nozzle tubes and the moisture in the air will condense to be dewdrops flowing to the root part when it is cold at night. Peruvian researchers hang some large nylon nets along the seaside to absorb the vapor, which will turn to be water flowing into the impounding reservoir for irrigation in coastal mud flat.

All above three water saving irrigation technologies can be selected according to the situations of various areas on development of water saving irrigation.