Method for controlling salt and saving water of nutritional soil for planting crops on mudflat saline-alkali land

Abstract

The invention discloses a method for controlling salt and saving water of nutritional soil for planting crops on a mudflat saline-alkali land. The method comprises the following steps of: determining a salt control target value according to a salt-tolerance threshold of planted crops; restraining salt content and making moisture by irrigating soil moisture water into the mudflat saline-alkali land; performing deep plowing and deep tillage after the soil is dry; paving crushed crop straws under the surface of the soil; seeding after leveling the land; and finally returning the crop straws intothe land for covering a sown land surface. Due to the adoption of the technical scheme, water resource is saved; and the irrigation amount can be reduced in the growth and development stages of the crops. When the soil moisture water is irrigated before sowing, because a four-electrode salt content sensor is adopted for monitoring a desalting process of the soil in real time, an irrigation salt control target and irrigation stop time are defined, and water resource loss is reduced; simultaneously, the straws are buried deeply and covered on the land surface, continuous damage caused by a capillary action is caused; an uplink surface congregation effect of the salt content in subsoil and underground water is prevented; soil salt return is inhibited effectively without irrigating for washing the salt in a dry season so that the water resource is saved; in addition, water loss is reduced because of the coverage on the surface of the land, the moisture keeping effect of the soil is improved and the irrigation amount in the growth and development stage of the crops can be reduced.

Description

1. Technical field [0001] The invention belongs to the technical field of tidal flat land management and agricultural utilization, and relates to a salt-controlling and water-saving method for planting crops in tidal flat saline-alkali land. 2. Background technology [0002] At present, my country's water and soil resources can only guarantee 500 million tons of grain production capacity, which is far from meeting the huge demand of the growing population. At the same time, my country's energy shortage contradiction is becoming increasingly acute, and the development of biomass energy must ensure the premise of "food security". my country currently owns coastal tidal flats with a total area of ​​nearly 40 million mu, which are important reserve land resources in my country. The development and utilization of saline-alkali soil in coastal tidal flats can not only provide food sources, but also become the production carrier of important salt-tolerant plants such as energy. Pl...

AI Technical Summary

Problems solved by technology

[0006] Technical problem: the purpose of this invention is to propose a series of practical problems such as poor effect of salt control methods on saline-alkali soil in coastal beaches, single technology use, backward monitoring means for salt control process, low water resource utilization efficiency, and slow soil fertility cultivation process. A set of nutritional soil salt control and water saving methods suitable for planting crops in saline-alkali land on coastal beaches

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