North coastal region saline soil irrigation method and system in winter

Abstract

The invention discloses a north coastal region saline soil irrigation method and system in winter. The north coastal region saline soil irrigation method in winter comprises the following steps of 1) digging a well; 2) pumping saline groundwater from the well and storing the pumped saline groundwater through a storage reservoir; 3) freezing the pumped saline groundwater in the step 2) into ice under the natural condition; 4) covering the frozen ice blocks in the step 3) on the surface of the soil to form into an ice coating irrigation layer; 5) pumping unfrozen saline water under the ice layer in the step 4) from the storage reservoir; 6) pumping the saline groundwater from the well and storing the saline groundwater into the storage reservoir when the natural condition changes and the ice coating irrigation layer starts melting; 7) repeating the step 2) to the step 6) and achieving north coastal region saline soil irrigation in winter. The north coastal region saline soil irrigation method in winter has the advantages of fully utilizing saline water sources, reducing exploitation of deep fresh groundwater and being benefited to reduction of the underground water level and restriction of accumulation of salt in the surface deep soil.

Description

technical field [0001] The present invention relates to irrigation technology. More specifically, it relates to an irrigation method and system suitable for deep soil leaching and desalination in coastal saline-alkali land in northern my country. Background technique [0002] Soil salinity is the main limiting factor of the ecological environment in the coastal areas of northern my country, and it is also the limiting factor that leads to the fragility of the ecological environment system and low environmental carrying capacity. It also seriously restricts the growth of agriculture and the development of rural economy. In northern coastal areas, the groundwater table is high, the salinity is strong, the soil salt in the plow layer is accumulated, and the freshwater resources for agricultural irrigation are scarce. In recent years, the salt water freezing irrigation method has achieved good results in the improvement of saline-alkali land irrigation in the Bohai Bay coastal ...

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Problems solved by technology

However, the salt will accumulate in the deep soil (60-100cm), and there is a risk of salt return in the surface soil

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