Collection device for ammonia gas in soil and method for determining loss amount of nitrogen in soil by using same

Abstract

The invention relates to a continuous collection device for volatile ammonia gas in field soil and a method for determining the loss amount of nitrogen in the soil by using the same. The device comprises an ammonia gas collector, an ammonia gas recycling device, a connection pipeline for connecting the ammonia gas collector and the ammonia gas recycling device, and an automatic temperature control device for regulating an internal temperature and an external temperature of the ammonia gas collector. Through measurement, collection and comparison of the internal soil temperature and the external soil temperature of the device, the internal soil temperature of the device can be automatically regulated, so the internal soil temperature and the external soil temperature of the device are kept consistent, and the effect of too large temperature difference on result authenticity is avoided. At the same time, with the use of a reaction principle of NH3 and sulfuric acid, a gas diffusion theory and an excess collection liquid, the soil volatile ammonia gas can be ensured to be continuously and completely collected. The device not only can be used for long-term continuous collection of the volatile ammonia gas in the field soil, can relatively accurately reflect the effect of the soil ammonia gas volatilization on the loss of nitrogen in the soil, but also has the characteristics of simple structure, easy operation and relatively low labor cost.

Description

technical field [0001] The invention relates to a collection device for volatile gas, in particular to a continuous collection device for collecting soil volatile gas in the field. Background technique [0002] Nitrogen fertilizer is a common production substance in agricultural and forestry production. After being applied to the soil, it can be decomposed and released to continuously provide nitrogen for crops within a certain period of time and promote plant growth. Ammonium nitrogen fertilizer and urea are two types of nitrogen fertilizers commonly used at present, and the NH formed by decomposition 4 + -N is one of the main forms of nitrogen absorbed by plant growth and is also the soil volatile NH 3 The most important forming substance, soil ammonia volatilization is the main way of nitrogen fertilizer and nitrogen loss in the process of agricultural and forestry production. Accurately collecting soil volatile ammonia gas and clarifying the resulting nitrogen loss is ...

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Problems solved by technology

However, none of the existing collection devices takes into account the impact of this temperature change on NH 3 The impact of volatilization is often used as the value collected at a certain point in time or in a relatively short period of time as the soil NH value in the entire growth period. 3 The average value of volatilization, and then converted to soil NH 3 -N volatilization loss, resulting in a large error between the converted value and the actual value

[0004] So far, there is no convenient method and equipment to accurately understand and master NH 3 The effect of volatilization on the loss of nitrogen in soil nitrogen fertilizers. The very few field-related equipment currently used is simply a combination of ammonia detection tubes and ammonia collection devices. Using the measured value of ammonia volatilization in this short period of time and DTM ( -Tube Method) to estimate soil nitrogen loss

However, since the strength of the soil ammonia volatilization process is closely related to many factors such as soil temperature and water content, changes in these factors will have a strong impact on the volatilization of ammonia gas.

Therefore, the instantaneous measured value of soil ammonia volatilization cannot truly reflect the actual state of the soil, resulting in a lack of rationality in the results

[0005] The existing methods and equipment for collecting and measuring soil volatile ammonia can only measure short-term or instantaneous ammonia volatilization, so the influence of various natural factors on ammonia collection during the long-term measurement process is not considered, especially the temperature. For the impact of ammonia volatilization, the rise of the soil temperature inside the measuring device will cause the ammonia volatilization of the soil inside the measuring device to exceed the actual volatilization state of the soil outside the device, resulting in inaccurate measurement results and unable to truly reflect the volatile ammonia in field soil. The actual volatilization status of the gas

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