Device for stimulating nutrient absorption of plant root system and using method of device

Abstract

The invention discloses a device for stimulating nutrient absorption of a plant root system and a using method of the device. The device comprises a sampling pipe, a liquid-supplying system and a low-pressure system, wherein the sampling pipe is respectively connected with the liquid-supplying system and the low-pressure system; the sampling pipe comprises a sampling pipe body and an anion / cation exchanging membrane; a plurality of holes are arranged in the middle of the outer wall of the sampling pipe body; and a plurality of grooves are arranged between the holes on the outer wall of the sampling pipe body. The method for using the device comprises the steps of: burying the sampling pipe which is soaked in a sodium bicarbonate (NaHCO3) solution in the soil for 2 hours; taking the sampling pipe out and eluting the sampling pipe with hydrochloric acid (HCl) solution; and detecting the content of anionic and cationic nutrients in the eluent to evaluate the nutrients, which can be absorbed by the plant root system, in the soil. The system disclosed by the invention has the advantages of high accuracy, energy conservation, environment friendliness, simple operating steps and the like.

Description

technical field [0001] The invention belongs to the technical field of extraction of soil nutrient ions, and in particular relates to a plant root nutrient absorption simulation device which utilizes an ion exchange membrane to simulate roots absorbing soil nutrient ions and a method for using the same. Background technique [0002] At present, there are mainly chemical extraction method and plant planting evaluation method for the extraction and determination of effective nutrient content in soil. The chemical extraction method prepares certain chemicals into an extract, adds the soil to the extract for shaking, centrifuges, collects the supernatant, and measures its nutrient content. This method is considered to be the benchmark method for soil nutrient determination, but it is different from the way plants absorb nutrients, and it cannot better reflect the impact of nutrients in soil on plants. Because different types of soil are very different, using the same extractant...

AI Technical Summary

Problems solved by technology

This method is considered to be the benchmark method for the determination of soil nutrients, but it is different from the way plants absorb nutrients and cannot better reflect the effects of nutrients in the soil on plants

Because different types of soil are very different, using the same extractant can not reflect the real situation of soil nutrient supply; moreover, the extraction process needs to consume more energy and reagents, which is not in line with the "low carbon" concept advocated today.

The soil nutrients absorbed by the plant planting evaluation method are in line with its own root system absorption law, but this method is time-consuming, and the nutrient absorption characteristics of different crop root systems are different, and the evaluation results of different crops for the same soil nutrient supply status are different. In addition, the experimental results are easily affected by the external environment and management level, so it is necessary to establish a unified and objective nutrient extraction method

[0003] The ion exchange resin ball (membrane) embedding method that emerged in the 1950s imitated the characteristics of plant roots absorbing nutrient ions in the soil to a certain extent, and could dynamically monitor the concentration of nutrient ions in the soil; while the current reported extraction method Most of the resin balls (membrane) are directly buried in the soil or buried in the soil after being packed in a mesh bag. It is inconvenient to operate each time it is taken out, and it is difficult to ensure that the resin ball (membrane) is fully in contact with the soil.

Another type of ion-exchange membrane-based extraction device was invented in 1992 by Jeff Schoenau of the University of Saskatchewan (University of Saskatchewan), Canada, and is currently operated by Western Ag Innovation Inc. ) "Plant Root Simulator" (Plant Root Simulator, PRS TM ) (US Patent: US6242261, Canadian Patent: CA 2129843C, Australian Patent: AU 673817B2, World Patent Organization Registration Number: WO 9316382A1), this device overcomes the troubles caused by directly embedding ion exchange membranes to a certain extent, but because the device It is only a piece of ion exchange membrane sandwiched in a plastic frame, but lacks a structure to promote extraction efficiency, so the extraction efficiency is low; and the device is low in integration, so it still requires more manual assistance when using it for soil nutrient extraction To ensure that it can be extracted normally

Moreover, the effective area of ​​the ion exchange membrane of this device is small, and the nutrient level of the entire cultivation layer cannot be completely monitored.

[0004] Therefore, the following defects generally exist in the prior art: (1) traditional chemical extraction methods are relatively accurate, but due to the need to collect soil samples, the soil mining process and subsequent air-drying and crushing processes will inevitably cause damage to the soil state and change the state of the soil. The actual situation of soil nutrient supply, and the overall time-consuming; plant planting experiments can certainly obtain results that conform to the law of plant absorption, but there are too many factors affecting the entire planting process, and the absorption characteristics of different crops are quite different, so different plants are used. Evaluation of the same soil will lead to different conclusions; (2) The reagents and operating processes used in traditional chemical extraction methods will cause different degrees of pollution to the environment, and the extraction process also consumes more energy and substances; (3) Traditional chemical extraction methods The extraction method requires cumbersome pre-treatment of the soil samples, and the plant planting test requires a lot of manpower, material resources and time to manage the whole process of planting.

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