CN115876982A - Device and method for rapidly measuring field water capacity - Google Patents
Device and method for rapidly measuring field water capacity Download PDFInfo
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- CN115876982A CN115876982A CN202310107379.5A CN202310107379A CN115876982A CN 115876982 A CN115876982 A CN 115876982A CN 202310107379 A CN202310107379 A CN 202310107379A CN 115876982 A CN115876982 A CN 115876982A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000011521 glass Substances 0.000 claims abstract description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 239000004576 sand Substances 0.000 claims abstract description 27
- 239000000741 silica gel Substances 0.000 claims abstract description 15
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000002689 soil Substances 0.000 claims description 99
- 229920006395 saturated elastomer Polymers 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 4
- 238000010561 standard procedure Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 8
- 239000004927 clay Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000003973 irrigation Methods 0.000 description 4
- 230000002262 irrigation Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 244000035744 Hura crepitans Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
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Abstract
The invention discloses a device and a method for rapidly measuring field water capacity, wherein the device for rapidly measuring field water capacity comprises an organic glass barrel, an organic glass cover, a silica gel sealing washer and a sand chip, wherein the sand chip is arranged in the organic glass barrel, and the outer edge of the sand chip is connected with the inner wall of the organic glass barrel in a sealing manner; the sand chip divides the inner cavity of the organic glass barrel into a cutting ring chamber positioned above and a water collecting chamber positioned below; the organic glass cover plate is hermetically connected with the opening with the glass barrel; the annular cutter chamber is connected with a pressurizing mechanism or the water collecting chamber is connected with a negative pressure mechanism. The invention solves the problems of time and labor waste of the traditional field water holding capacity measuring method and reduces result errors caused by factors such as the technical level of workers, the working experience, the dedication spirit and the like.
Description
Technical Field
The invention relates to a detection technology, in particular to a device and a method for quickly measuring field water capacity.
Background
The field water capacity is an important parameter for farmland soil water management, and the field water capacity refers to the stable soil water content which can be maintained by soil after a certain period of time, namely the maximum value of the suspended water which can be maintained by the soil after soil gravity water is removed, wherein the water is allowed to fully infiltrate and prevent evaporation after the soil is fully irrigated or precipitated under the conditions of deeper underground water and good drainage. The field water capacity comprises: hygroscopic water, membranous water, capillary hanging water. The field water holding capacity of the soil with different textures is different, and the clay loam sand is common. In addition, factors such as soil organic matter content, soil profile structure and groundwater burial depth can all influence field water holding capacity, and accurate determination of field water holding capacity is an important basis for accurate management of soil moisture and is an important decision parameter for reasonable irrigation and water saving and efficiency improvement.
The existing method for measuring the field water capacity can be divided into two types, one type is a surrounding frame flooding irrigation method in the field; another class is the in-house assay, including the sand-box method, the circular knife method (Wilcoxy method), and the like. The surrounding frame flooding irrigation method needs special equipment, has high investment, needs a large amount of water sources, has long measuring period and is easy to cause the problems of uneven irrigation and infiltration. The sand box method is simple and convenient to operate, but needs long drainage time. The ring knife method is the most commonly used method for measuring the field water capacity in a laboratory, but the method is greatly influenced by the texture and the water content of underlying soil, and needs to drain for a longer time.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device for quickly measuring the field water capacity. The device for rapidly measuring the field water capacity is simple to operate, accurate in measurement, capable of reducing the drainage time and capable of measuring in batches.
Meanwhile, the invention also aims to provide a method for quickly measuring the field water capacity.
The purpose of the invention is realized by the following technical scheme: the device for rapidly measuring the field water capacity comprises an organic glass barrel, an organic glass cover, a silica gel sealing washer and a sand chip, wherein the sand chip is arranged in the organic glass barrel, and the sand chip is connected with the inner wall of the organic glass barrel in a sealing manner through the silica gel sealing washer; the sand chip divides the inner cavity of the organic glass barrel into a cutting ring chamber positioned above and a water collecting chamber positioned below; the organic glass cover is hermetically connected with the opening of the organic glass barrel; the annular cutter chamber is connected with a pressurizing mechanism or the water collecting chamber is connected with a negative pressure mechanism.
Preferably, the quick survey device of field moisture capacity still include between organic glass lid and the organic glass bung hole to fill up and have silica gel seal ring, just organic glass lid passes through buckle locking connection with the organic glass bucket.
Preferably, a drain valve is installed at the bottom of the side wall of the water collecting chamber.
Preferably, the pressurizing mechanism comprises an air inlet pipe, a first pressure regulating valve, a first pressure gauge and a pressurizing pump, the pressurizing pump is connected with the cutting ring chamber through the air inlet pipe, and the first pressure regulating valve and the first pressure gauge are both arranged in the air inlet pipe.
Preferably, the negative pressure mechanism comprises an exhaust pipe, a second pressure regulating valve, a second pressure gauge and an air pump, the air pump is connected with the water collecting chamber through the exhaust pipe, and the second pressure regulating valve and the second pressure gauge are both mounted on the exhaust pipe.
The method for rapidly measuring the field water capacity by adopting the device for rapidly measuring the field water capacity comprises the following steps:
s1, collecting a soil sample: collecting a soil sample by adopting a cutting ring according to a soil cutting ring sample standard method, filling the inner cavity of the cutting ring with the soil sample, and bringing the soil sample back to a laboratory together with the cutting ring;
s2, saturated soil sample: soaking the soil sample in the cutting ring in water for a certain time to enable the moisture of the soil sample to reach a saturated state, and then placing the soil sample in the saturated state into the cutting ring chamber;
s3, draining: opening a bottom drain valve, starting a pressurizing mechanism to increase the internal pressure of the ring cutter chamber, stabilizing the internal pressure of the ring cutter chamber at a preset value for a certain time, observing whether water is discharged from the water collecting chamber or not for a certain time, and closing the pressurizing mechanism after no water is discharged for a certain time;
alternatively, the first and second liquid crystal display panels may be,
closing the bottom drain valve, starting the negative pressure mechanism to reduce the internal pressure of the water collecting chamber, stabilizing the internal pressure of the water collecting chamber at a preset value for a certain time, observing whether water is discharged from the water collecting chamber or not for a certain time, and closing the negative pressure mechanism after no water is discharged for a certain time;
s4, water content determination: and taking out the soil sample in the cutting ring chamber, and measuring the water content of the soil sample to determine the field water capacity.
Preferably, between steps S1 and S2, the following steps are further included: water is added to the sand core pieces to saturate the sand core pieces with retained water.
Preferably, in step S2, the soil sample is soaked in water for more than 24 hours.
Preferably, in step S3, after the pressurization mechanism is started, the preset value is 5.5 to 6.8kpa, the time for stabilizing the preset value is greater than or equal to 24 hours, and the time for continuous observation is greater than or equal to 24 hours.
Preferably, in step S3, after the negative pressure mechanism is started, the preset value is-6.8 to-5.5 kPa, meanwhile, the time for stabilizing the preset value is greater than or equal to 24 hours, and the time for continuous observation is greater than or equal to 24 hours.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts the pressurizing mechanism to pressurize the soil sample in the cutting ring chamber so as to accelerate the drainage speed, solve the problem of long drainage time under natural gravity and greatly improve the efficiency of the measurement work; meanwhile, the field water capacity state is achieved only by observing that water is not discharged any more after the pressure value is set, and frequent weighing to constant weight is not needed, so that the problems of time and labor waste of the traditional field water capacity measuring method are solved, and result errors caused by factors such as the technical level of workers, working experience, industry spirit and the like are reduced.
2. The invention adopts the negative pressure mechanism to adjust the internal pressure of the water collecting chamber so as to accelerate the drainage speed, solve the problem of long drainage time under natural gravity and greatly improve the efficiency of the measurement work; meanwhile, the field water capacity state is achieved only by setting a pressure value and observing that water is not discharged any more, the traditional field water capacity measuring method does not need to be frequently weighed to constant weight, the problems of time and labor waste in the traditional field water capacity measuring method are solved, and result errors caused by factors such as the technical level of workers, working experience, employment spirit and the like are reduced.
3. According to the invention, the inner cavity of the organic glass barrel is divided by the sand chip to form the cutting ring chamber for placing the cutting ring and the water collecting chamber for collecting water, so that the cutting ring chamber and the water collecting chamber are of an integrated structure, the condition that soil falls out or overturns in the cutting ring taking and placing process can be prevented, and the detection accuracy is ensured; meanwhile, the annular cutter chamber and the water collecting chamber are connected into a whole, so that the storage and use space is reduced, and the water discharged by the sample can be effectively collected.
Drawings
FIG. 1 is a schematic view showing the construction of an apparatus for rapidly measuring field capacity in example 1 of the present invention.
Fig. 2 is a schematic structural view of a device for rapidly measuring field capacity according to example 2 of the present invention.
Wherein, 1 is the organic glass lid, 2 is silica gel seal ring, 3 is the buckle, 4 is first manometer, 5 is the intake pipe, 6 is the force (forcing) pump, 7 is the organic glass bucket, 8 is the cutting ring of being equipped with the soil sample, 9 is the psammitolite piece, 10 is the drain valve, 11 is first air-vent valve, 12 is the cutting ring room, 13 is the collecting chamber, 14 is the second manometer, 15 is the second air-vent valve, 16 is the exhaust tube, 17 is the aspiration pump.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1
The device for rapidly measuring the field water capacity as shown in fig. 1 comprises an organic glass barrel 7, an organic glass cover 1, a silica gel sealing washer 2 and a sand chip 9, wherein the sand chip 9 is arranged in the organic glass barrel 7, and the outer edge of the sand chip 9 is hermetically connected with the inner wall of the organic glass barrel 7 through the silica gel sealing washer 2; the sand chip 9 divides the inner cavity of the organic glass barrel 7 into a cutting ring chamber 12 positioned above and a water collecting chamber 13 positioned below; the organic glass cover 1 is hermetically connected with an opening of the organic glass barrel 7; the ring cutter chamber 12 is connected with a pressurizing mechanism. The pressurizing mechanism comprises an air inlet pipe 5, a first pressure regulating valve 11, a first pressure gauge 4 and a pressurizing pump 6, the pressurizing pump 6 is connected with the cutting ring chamber 12 through the air inlet pipe 5, and the first pressure regulating valve 11 and the first pressure gauge 4 are both arranged in the air inlet pipe 5. Wherein, the ventilation value of the sand core sheet 9 is more than 10kPa to ensure the effective detection.
Specifically, the first pressure regulating valve 11 is adjusted to a preset value, the booster pump 6 is started, and whether the value of the first pressure gauge 4 is stabilized at the preset value is observed; after the data of the first pressure gauge 4 is stabilized at the preset value, that is, after the internal pressure of the cutting ring chamber 12 is stabilized at the preset value, observing whether water is discharged into the water collecting chamber 13 after a period of time, and after no water is discharged into the water collecting chamber 13, stabilizing the pressure for a period of time to ensure that the water in the soil sample in the cutting ring chamber 12 is fully discharged under the condition of the preset pressure value. The mode of adopting pressure to accelerate drainage efficiency improves the detection efficiency and has high accuracy.
Meanwhile, the ring cutter chamber 12 adopts an organic glass barrel 7, an organic glass cover 1, a silica gel sealing washer 2 and a sand chip 9 to form a relatively sealed space for placing a soil sample. The cutting ring chamber 12 with the structure can reduce the risk of soil leakage or overturning and ensure the effective detection. The cutting ring chamber 12 and the water collecting chamber 13 are formed by separating the inner cavity of the organic glass barrel 7 through the sand chip 9, the integrated structure reduces the storage and use space, and simultaneously ensures that all water discharged from the soil sample in the cutting ring chamber 12 can fall into the water collecting chamber 13; and the cutting ring room 12 and the header chamber 13 of the integral type that organic glass bucket 7, organic glass lid 1, silica gel seal ring 2 and sand chip 9 etc. constitute can make things convenient for the loading system to adjust the pressure of cutting ring room 12, also make things convenient for negative pressure mechanism to carry out pressure adjustment to header chamber 13 to guarantee to detect effectively going on.
The device for rapidly measuring the field water capacity further comprises a silica gel sealing washer 2 arranged between the organic glass cover 1 and the organic glass barrel 7, and the organic glass cover 1 is connected with the organic glass barrel 7 in a locking mode through a buckle 3. The setting up of silica gel seal ring 2 and buckle 3 has guaranteed the firm in connection nature between organic glass lid 1 and the organic glass bucket 7 to guarantee the sealed effect of ring sword room 12 and collecting chamber 13.
The bottom of the side wall of the water collecting chamber 13 is provided with a drain valve 10. The arrangement of the drain valve 10 is convenient for draining the water in the water collecting chamber 13, and the experiment can be effectively carried out.
The method for rapidly measuring the field water capacity by adopting the device for rapidly measuring the field water capacity comprises the following steps:
s1, collecting a soil sample: collecting a soil sample by adopting a cutting ring according to a soil cutting ring sample standard method, wherein the soil sample is filled in the inner cavity of the cutting ring and is taken back to a laboratory together with the cutting ring; specifically, a field position to be measured is determined, a flat soil surface of a soil layer is taken at the field position, and a cutting edge end of a ring cutter (the volume is 100 cubic centimeters) which is weighed in advance and is numbered with the diameter of 50.46mm and the height of 50mm is cut into the soil by using a ring cutter handle. Stopping cutting when the cutting ring is full of soil, digging soil around the cutting ring by using an iron shovel, taking out the whole cutting ring wrapped by the soil, cutting soil on the outer wall of the cutting ring by using a soil cutting knife, cutting redundant soil at two ends, enabling the volume of the soil in the cutting ring to be just the volume of the cutting ring, and covering a lower cover and a top cover of the cutting ring.
S2, saturated soil sample: soaking the soil sample in the cutting ring in water for a certain time to enable the moisture of the soil sample to reach a saturated state, and then placing the soil sample in the moisture saturated state into the cutting ring chamber 12; specifically, an aluminum cover with a small hole is covered at the bottom end of a cutting ring filled with a soil sample, the cutting ring is placed in a flat-bottom container, water is slowly added into the container outside the cutting ring until the water level is slightly lower than the top of the cutting ring, the water in the container gradually enters the soil in the cutting ring through the small hole at the bottom under the action of water pressure, the water level is maintained for 24 hours, the moisture of the soil sample reaches a saturated state, and then the soil sample in the moisture saturated state is placed in a cutting ring chamber 12. Before the soil sample in the water saturation state is placed in the cutting ring chamber 12, water is added to the sand core piece 9 to keep the water of the sand core piece 9 saturated. To further improve the accuracy of the inspection. As shown in fig. 1, a plurality of cutting rings containing soil samples can be simultaneously placed in the cutting ring chamber 12, so that batch detection is realized, and the detection efficiency is improved.
S3, draining: opening the bottom drain valve 10, starting the pressurizing mechanism to increase the internal pressure of the ring cutter chamber 12, stabilizing the internal pressure of the ring cutter chamber 12 at a preset value for a certain time, observing whether water is discharged from the water collecting chamber 13 or not for a certain time, and closing the pressurizing mechanism after the water is not discharged for a certain time; after the pressurizing mechanism is started, the preset value is 5.5 to 6.8kPa, meanwhile, the time for stabilizing the preset value is more than or equal to 24 hours, and the time for continuous observation is more than or equal to 24 hours. The preset value is related to the matrix potential corresponding to the field water capacity of the soil to be detected, and the preset value is equal to the absolute value of the matrix potential corresponding to the field water capacity of the soil to be detected. Different field soils have different field water capacities, such as fine sand ranging from-6.0 kPa to-5.5 kPa, clay ranging from-6.8 kPa to-6.2 kPa and clay loam ranging from-5.5 kPa to-6.8 kPa. Therefore, the preset value in this embodiment is selected to be an appropriate value according to the type of soil.
S4, water content determination: the soil sample in the ring cutter chamber 12 is taken out and the water content of the soil sample is measured to determine the field water capacity.
Example 2
The device and the method for rapidly measuring the field water capacity are the same as those in the embodiment 1 except for the following technical characteristics:
as shown in fig. 2, the device for rapidly measuring the field water capacity comprises an organic glass barrel 7, an organic glass cover 1, a silica gel sealing washer 2 and a sand chip 9, wherein the sand chip 9 is arranged in the organic glass barrel 7, and the outer edge of the sand chip 9 is connected with the inner wall of the organic glass barrel 7 in a sealing manner; the sand chip 9 divides the inner cavity of the organic glass barrel 7 into a cutting ring chamber 12 positioned above and a water collecting chamber 13 positioned below; the organic glass cover 1 is hermetically connected with an opening of the organic glass barrel 7; the water collecting chamber 13 is connected with a negative pressure mechanism. The negative pressure mechanism comprises an air suction pipe 16, a second pressure regulating valve 15, a second pressure gauge 14 and an air suction pump 17, the air suction pump 17 is connected with the water collecting chamber 13 through the air suction pipe 16, and the second pressure regulating valve 15 and the second pressure gauge 14 are both arranged on the air suction pipe 16.
Specifically, the second pressure regulating valve 15 is adjusted to a preset value, the air pump is started, and whether the value of the second pressure gauge 14 is stabilized at the preset value is observed; after the data of the second pressure gauge 14 is stabilized at the preset value, that is, after the internal pressure of the ring cutter chamber 12 is stabilized at the preset value, observing whether water is drained to the water collecting chamber 13 after a period of time, and after no water is drained to the water collecting chamber 13, stabilizing the pressure for a period of time to ensure that the moisture in the soil sample in the ring cutter chamber 12 is fully drained under the preset pressure condition. The mode of adopting negative pressure to accelerate the drainage efficiency improves the detection efficiency and has high accuracy.
The method for quickly measuring the field water capacity by adopting the device for quickly measuring the field water capacity comprises the following steps:
s1, collecting a soil sample: adopting a cutting ring to dig a soil sample, wherein the soil sample is filled in the inner cavity of the cutting ring; specifically, a field position to be measured is determined, a flat soil surface of a soil layer is taken at the field position, and a cutting edge end of a ring cutter (the volume is 100 cubic centimeters) which is weighed in advance and is numbered with the diameter of 50.46mm and the height of 50mm is cut into the soil by using a ring cutter handle. Stopping cutting when the cutting ring is full of soil, digging soil around the cutting ring by using an iron shovel, taking out the whole cutting ring wrapped by the soil, cutting soil on the outer wall of the cutting ring by using a soil cutting knife, and cutting redundant soil at two ends to ensure that the volume of the soil in the cutting ring is just the volume of the cutting ring, and covering a lower cover and a top cover of the cutting ring.
S2, saturated soil sample: soaking the soil sample in the cutting ring in water for a certain time to make the moisture of the soil sample reach a saturated state, and then placing the soil sample in the saturated state into the cutting ring chamber 12; specifically, an aluminum cover with a small hole is covered at the bottom end of a cutting ring filled with a soil sample, the cutting ring is placed in a flat-bottom container, water is slowly added into the container outside the cutting ring until the water level is slightly lower than the top of the cutting ring, the water in the container gradually enters the soil in the cutting ring through the small hole at the bottom under the action of water pressure, the water level is maintained for 24 hours, the moisture of the soil sample reaches a saturated state, and then the soil sample in the moisture saturated state is placed in a cutting ring chamber 12. Before the soil sample in the water saturation state is placed in the cutting ring chamber 12, water is added to the sand core piece 9 to keep the water of the sand core piece 9 saturated.
S3, closing the drain valve 10 at the bottom, starting the negative pressure mechanism to reduce the internal pressure of the water collecting chamber, stabilizing the internal pressure of the water collecting chamber 13 at a preset value for a certain time, observing whether water is discharged from the water collecting chamber 13 or not for a certain time, and closing the negative pressure mechanism after no water is discharged for a certain time; after the negative pressure mechanism is started, the preset value is-6.8 to-5.5 kPa, meanwhile, the time for stabilizing the preset value is more than or equal to 24 hours, and the time for continuous observation is more than or equal to 24 hours. The preset value is related to the matrix potential corresponding to the field water capacity of the soil to be detected, and the preset value is equal to the matrix potential corresponding to the field water capacity of the soil to be detected. Different field soils have different field water capacities, such as fine sand between-6.0 kPa and-5.5 kPa, clay between-6.8 kPa and-6.2 kPa and clay loam between-5.5 kPa and-6.8 kPa. Therefore, the preset value in this embodiment is selected to be an appropriate value according to the type of soil.
S4, water content determination: the soil sample in the ring cutter chamber 12 is taken out and the water content of the soil sample is measured to determine the field water capacity.
The above detailed description is a preferred embodiment of the present invention, and is not intended to limit the present invention, and any other modifications or equivalent substitutions that do not depart from the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Quick survey device of field water capacity which characterized in that: the device comprises an organic glass barrel, an organic glass cover, a silica gel sealing washer and a sand chip, wherein the sand chip is arranged in the organic glass barrel, and the sand chip is connected with the inner wall of the organic glass barrel in a sealing manner through the silica gel sealing washer; the sand chip divides the inner cavity of the organic glass barrel into a cutting ring chamber positioned above and a water collecting chamber positioned below; the organic glass cover is hermetically connected with the opening of the organic glass barrel; the annular cutter chamber is connected with a pressurizing mechanism or the water collecting chamber is connected with a negative pressure mechanism.
2. The device for the rapid determination of field capacity according to claim 1, characterized in that: still include to fill up between organic glass lid and the organic glass bung hole and have silica gel seal ring, just organic glass lid passes through buckle locking connection with the organic glass bucket.
3. The device for rapidly determining field water capacity according to claim 1, wherein: and a drain valve is arranged at the bottom of the side wall of the water collecting chamber.
4. The device for the rapid determination of field capacity according to claim 1, characterized in that: the pressurizing mechanism comprises an air inlet pipe, a first pressure regulating valve, a first pressure gauge and a pressurizing pump, the pressurizing pump is connected with the cutting ring chamber through the air inlet pipe, and the first pressure regulating valve and the first pressure gauge are both arranged in the air inlet pipe.
5. The device for the rapid determination of field capacity according to claim 1, characterized in that: the negative pressure mechanism comprises an exhaust pipe, a second pressure regulating valve, a second pressure gauge and an air pump, the air pump is connected with the water collecting chamber through the exhaust pipe, and the second pressure regulating valve and the second pressure gauge are both installed on the exhaust pipe.
6. The method for rapidly measuring the field water capacity is characterized in that the device for rapidly measuring the field water capacity according to any one of claims 1 to 5 is adopted, and comprises the following steps:
s1, collecting a soil sample: collecting a soil sample by adopting a cutting ring according to a soil cutting ring sample standard method, wherein the soil sample is filled in the inner cavity of the cutting ring and is taken back to a laboratory together with the cutting ring;
s2, saturated soil sample: soaking the soil sample in the cutting ring in water for a certain time to enable the moisture of the soil sample to reach a saturated state, and then placing the soil sample in the saturated state into the cutting ring chamber;
s3, draining: opening a bottom drain valve, starting a pressurizing mechanism to increase the internal pressure of the ring cutter chamber, stabilizing the internal pressure of the ring cutter chamber at a preset value for a certain time, observing whether water is discharged from the water collecting chamber or not for a certain time, and closing the pressurizing mechanism after no water is discharged for a certain time;
alternatively, the first and second liquid crystal display panels may be,
closing the bottom drain valve, starting the negative pressure mechanism to reduce the internal pressure of the water collecting chamber, stabilizing the internal pressure of the water collecting chamber at a preset value for a certain time, observing whether water is discharged from the water collecting chamber or not for a certain time, and closing the negative pressure mechanism after no water is discharged for a certain time;
s4, water content determination: and taking out a soil sample in the cutting ring chamber, and measuring the water content of the soil sample to determine the field water capacity.
7. The method for rapidly determining field water capacity according to claim 6, wherein the method comprises the following steps: between steps S1 and S2, the following steps are further included: water is added to the sand core pieces to saturate the sand core pieces with retained water.
8. The method for rapid determination of field capacity of claim 6, wherein: in step S2, the soil sample is soaked in water for more than 24 hours.
9. The method for rapidly determining field water capacity according to claim 6, wherein the method comprises the following steps: in the step S3, after the pressurizing mechanism is started, the preset value is 5.5-6.8kPa, meanwhile, the time for stabilizing the preset value is more than or equal to 24h, and the time for continuous observation is more than or equal to 24h.
10. The method for rapid determination of field capacity of claim 6, wherein: in the step S3, after the negative pressure mechanism is started, the preset value is-6.8 to-5.5 kPa, meanwhile, the time for stabilizing the preset value is more than or equal to 24 hours, and the time for continuous observation is more than or equal to 24 hours.
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| CN112730800A (en) * | 2020-12-14 | 2021-04-30 | 云南俊联科技有限公司 | Online measuring method for field water holding capacity |
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2023
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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