Soil solution original-position collecting device for paddy planting system rooting zone and application method thereof

A soil solution and planting system technology, applied in measurement devices, sampling devices, instruments, etc., can solve problems such as unfavorable rhizosphere and soil distinction, affecting rhizosphere nutrient migration, and narrow device system box, achieving small disturbance, Simple operation and wide applicability

Active Publication Date: 2009-09-09
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the birth of the micro-rhizosphere soil solution sampler, there have been many studies on rhizosphere in situ solution, but these studies have been limited to dry land so far. For paddy field planting systems, there are big problems that make it impossible to carry out specific research.
[0003] Compared with dry land, in the paddy field planting system, the soil is in a water-saturated state most of the time. After applying the device used in the dry land research to the paddy field system, there will be water leakage around the device, which will affect the flooded soil. and rhizosphere nutrient migration, redox and other in-situ conditions; in addition, the device system box suitable for dry land is narrow. For fibrous root plants such as paddy field crops such as rice, especially in saturated conditions, too narrow box is not conducive to The distinction between rhizosphere and soil, these issues are important constraints for the study of in situ solution phase of paddy field rhizosphere

Method used

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  • Soil solution original-position collecting device for paddy planting system rooting zone and application method thereof
  • Soil solution original-position collecting device for paddy planting system rooting zone and application method thereof
  • Soil solution original-position collecting device for paddy planting system rooting zone and application method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Such as figure 1 As shown, when two buffer bottles, vacuum pumps, pressure sensors, and collectors connected in series are connected by vacuum connecting pipe 3 and glass air guide pipe 4, the joints of the connecting parts are repeatedly and evenly coated with vacuum grease. The connection between the vacuum three-way switch 13 and the vacuum connecting pipe 3 is all wrapped with raw tape before being connected. The vacuum pump power supply and the signal end of the pressure sensor 7 are respectively connected to specific parts of the vacuum controller, and the required negative pressure is set through the vacuum controller. When the pressure sensor 7 arranged on the series buffer bottle 5 senses the negative pressure in the buffer bottle When the pressure is insufficient or exceeds, the vacuum controller automatically turns on or off the power of the vacuum pump. During the sampling process, turn on the vacuum controller switch and set the negative pressure value. Af...

Embodiment 2

[0022] The method is carried out by using the inventor's own rhizosphere soil solution in-situ collection device. First, check whether there is any water leakage in the plant growth box with water, and the water-tight box can be used. In order to reduce the inhomogeneity of soil moisture and nutrients caused by soil aggregates, the present invention uses 100-mesh soil as the soil material. When the soil material is fully mixed with fertilizers, slowly pour distilled water into it, and let it stand for 12 hours to make it firm to ensure that the soil is uniform before planting plants. The seeds that have just germinated are selected for sowing, the sowing site is close to one side of the plant growth box, and the plant root system extends toward the other side of the plant growth box and downwards. The detailed structure of the sampling process is as follows: Figure 5 As shown, in a certain period of plant growth, when samples need to be collected, observe the row and column...

Embodiment 3

[0028] Figure 5 The figure shows the specific conditions of the sampling points during the sampling process. The micro-soil solution sampler is placed close to the root surface to collect in-situ samples of the soil solution on the root surface of a single root or a group of roots. Take the condition of a single root (diameter 1-2mm) in the rhizosphere (within 2mm from the root surface) as an example, such as Figure 5 As shown, the sampling points around the root surface are in the shape of a half cylinder, and the calculation formula for the volume of the half cylinder is: root surface cross-sectional area × root surface range; the calculation formula for root surface solution volume is: root surface volume × soil bulk density × soil water content.

[0029] Based on a single root of 1-2mm and a radius of 2mm in the rhizosphere, the volume of the root surface sampling area is: minimum, 3.14×(5 / 2) 2 ×5 / 2=49.0625mm 3 . Maximum: 3.14×(6 / 2) 2 ×6 / 2=84.78mm 3 . The bulk dens...

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Abstract

The invention provides a soil solution original-position collecting device special for a paddy planting system rooting zone and an application method thereof. The soil solution original-position collecting device has accurate and fast collection and little perturbation of water saturated soil. The soil solution original-position collecting device for the paddy planting system rooting zone comprises a vacuum pump, a vacuum controller, a pressure inductor, a surge flask, a micro sample collector and a plant growing box, wherein the plant growing box is provided with a micro soil solution collector, the micro soil solution collector is connected with a liquid receiving tube of the micro sample collector through a liquid guide tube, the micro sample collector is connected with the surge flask through a vacuum tube which is provided with a vacuum three-way cock, the pressure inductor is arranged on the surge flask which is connected with the vacuum pump through the vacuum tube, and the vacuum controller is respectively connected with power sources of the vacuum pump and the pressure inductor.

Description

1. Technical field [0001] The invention relates to a soil solution in-situ collection device and its application. The device is suitable for the research of plant rhizosphere chemistry and soil solution chemistry in soil science, plant nutrition science and environmental science, and is especially suitable for the rhizosphere of paddy field planting system. The soil solution was collected in situ. 2. Background technology [0002] In the prior art, there are already many in-situ sampling devices for soil solution, but due to the large size of the device and the large disturbance to the soil and rhizosphere, many of them are not suitable for collecting the in-situ solution of the rhizosphere in paddy fields. Since the birth of the micro-rhizosphere soil solution sampler, there have been many studies on rhizosphere in situ solution, but these studies have been limited to dry land so far. For paddy field planting systems, there are big problems that make it impossible to carry ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/14G01N27/447
Inventor 施卫明刘新红
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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