Method for quickly desalinizing mud flat saline and alkaline land by laying sludge on surface layer

Abstract

The invention relates to the technical field of desalinization of mud flat saline and alkaline lands, particularly a method for quickly desalinizing a mud flat saline and alkaline land by laying sludge on a surface layer. The method comprises the steps: circularly building ridges 30-40 cm high around a paving range, and distributing an irrigation and drainage system; uniformly paving river and lake dredging sludge 30 cm thick on the surface of the mud flat saline and alkaline land; irrigating fresh water on the surface of sludge and maintaining 10-15 cm of a water layer; directly planting rice on the surface of sludge; and carrying out irrigation according to the growing requirement of rice, and in a water requiring stage for rice growth, ensuring that the water layer is properly 10-15 cm. Rice is planted in the sludge layer, the purpose of washing salt and pressing alkali is achieved by virtue of continuous infiltration of irrigation water for rice, the desalinizing speed of the mud flat saline and alkaline land is accelerated, the quality of mud flat soil is improved, and the mud flat soil is quickly reclamated to be used.

Description

technical field [0001] The invention relates to the technical field of tidal flat saline land desalination treatment, in particular to a method for rapidly desalting tidal flat saline land by laying mud on the surface. Background technique [0002] Tidal flat reclamation and development is one of the main ways to replenish cultivated land in my country's coastal areas, and has important strategic significance for the sustainable development of agriculture and economy in my country's coastal areas. The tidal flat area in my country is about 2.5 million hm 2 , and with 5000hm per year 2 The left and right land forming speeds extend to the sea. Since most tidal flats are formed by coastal reclamation, high salinity in soil, high mineralization degree of groundwater and shallow buried depth, and serious soil salinity damage are the main limiting factors for tidal flat utilization. Up to now, the utilization rate of tidal flat development in my country is less than 50%. Becau...

AI Technical Summary

Problems solved by technology

Up to now, the utilization rate of tidal flat development in my country is less than 50%

Therefore, a large amount of water is consumed during the leaching process, resulting in a waste of water resources, and the leaching and desalting time is relatively long

Using rice planting water washing technology to desalinate saline-alkali land often results in slow growth of rice and extremely low yield due to poor soil and nutrient deficiencies in saline-alkali land

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