USE OF1,9-DECANEDIOL IN INHIBITING AMMONIA VOLATILIZATION FROM SOIL

Abstract

A use of 1,9-decanediol in inhibiting ammonia volatilization from soil is provided. It is found that 1,9-decanediol has dual regulation effects, not only significantly inhibiting ammonia volatilization from soil, but also effectively inhibiting nitrification process, which plays synergistic effects. As a fat-soluble substance, 1,9-decanediol has high stability in soil and is not easy to be separated from nitrogen fertilizer. 1,9-decanediol, as a plant root exudate, also has advantages of being green, safe, and pollution-free, which provides a new method and an idea to expand an application field of 1,9-decanediol and improve an industrial application value of 1,9-decanediol.

Claims

1. A use of 1,9-decanediol, comprising: preparing a mixed solution based on the 1,9-decanediol and urea; and applying the mixed solution to soil containing urease, and the 1,9-decanediol of the mixed solution acting as an inhibitor of the urease to reduce a conversion of the urea to an ammonia nitrogen and thereby reduce ammonia volatilization from the soil.

2. (canceled)

3. The use according to claim 1, wherein an addition amount of the 1,9-decanediol in the soil is in a range of 100 micrograms per kilogram (mg/kg) to 1000 mg/kg.

4-5. (canceled)

Description

BRIEF DESCRIPTION OF DRAWINGS

[0014] FIG. 1 illustrates a schematic diagram of an experimental soil column.

[0015] FIG. 2 shows cumulative amounts of ammonia volatilization from soil corresponding to different additions of 1,9-decanediol.

[0016] FIG. 3 shows cumulative amounts of ammonia volatilization from soil treated with different inhibitors.

DETAILED DESCRIPTION OF EMBODIMENTS

[0017] Embodiment 1:1, 9-decanediol and urea are prepared into a mixed solution to be applied to soil. Among them, an addition amount of 1,9-decanediol in soil is 100 micrograms per kilogram (mg/kg).

[0018] Embodiment 2:1, 9-decanediol and urea are prepared into another mixed solution to be applied to soil. Among them, an addition amount of 1,9-decanediol in soil is 200 mg/kg.

[0019] Embodiment 3:1, 9-decanediol and urea are prepared into still another mixed solution to be applied to soil. Among them, an addition amount of 1,9-decanediol in soil is 500 mg/kg.

[0020] Embodiment 4:1, 9-decanediol and urea are prepared into a mixed solution to be applied to soil. Among them, an addition amount of 1,9-decanediol in soil is 1000 mg/kg.

Test Example 1: Effects of 1,9-Decanediol on Ammonia Volatilization From Soil

1. Experimental Design

[0021] 1.1 test soil: the test soil type is paddy soil, and the texture is sandy loam. It is collected from 0~20 centimeters (cm) topsoil of the experimental field in Yingtan City, Jiangxi Province (28°15′N, 116°55′E), sieved with a 2 millimeters (mm) sieve, and mixed evenly. See Table 1 for basic physical and chemical properties.

TABLE-US-00001 physical and chemical properties of soil pH Total nitrogen (g/kg) NH.sub.4.sup.+—N (mg/kg) NO.sub.3.sup.——N (mg/kg) Organic matter (g/kg) 5.06 0.92 9.94 7.49 16.6

1.2 Test Reagent: 1,9-decanediol (C.SUB.10.H.SUB.22.O.SUB.2.)

[0022] 1.3 experimental treatment: urea treatment (U) and 1,9-decanediol + urea treatment are set in experiments. Among them, 1, 9-decanediol is added in soil at four levels of 100 mg/kg, 200 mg/kg, 500 mg/kg, and 1000 mg/kg, numbered as: 1, 9-D-100, 1, 9-D-200, 1, 9-D-500, and 1, 9-D-1000 respectively. Each treatment is repeated three times. The nitrogen application rate is 200 mg nitrogen per kilogram soil.

1.4 Experimental Steps

[0023] A soil column culture method is used for the test (FIG. 1). The soil column is 18 centimeters (cm) in height and 5 cm in inner diameter, which is divided into a leak-proof layer, a soil-fertilizer mixed layer, a flooded layer, and an idle layer (also referred to as spare layer). A leak-proof pad and 1 cm thick quartz sand are placed in the leak-proof layer at a bottom of the soil column firstly to prevent soil leakage and simulate a real situation in the field, and then the experimental soil is added to the soil-fertilizer mixed layer, and after compaction, a bottom leaching switch is turned on and water is added to restore the soil activity. After one night of soil recovery activity, the bottom leaching switch is turned off, and the urea required for each treatment is mixed with 1,9-decanediol to prepare a mixed solution. The mixed solution is evenly applied to the soil-fertilizer mixture layer of the soil column, the water is added to maintain a flooded state, and the ammonia volatilization from soil is monitored for 21 consecutive days.

1.5 Experimental Results

[0024] Compared with the treatment (U) without 1,9-decanediol, the application of 1,9-decanediol can significantly reduce the total amount of ammonia volatilization from soil, and the inhibition effect of ammonia volatilization is more obvious with the increase of the dosage of 1,9-decanediol (as shown in FIG. 2).

Test Example 2: Effects of Different Inhibitors on Ammonia Volatilization From Soil

2.1 Test Soil: The Same as Test Example 1

[0025] 2.2 test reagent: 1, 9-decanediol, the same as test example 1, dicyandiamide (DCD, C.sub.2H.sub.4N.sub.4), linolenic acid (LN, C.sub.12H.sub.30O.sub.2) and methyl 3-(4-hydroxyphenyl)propionate (MHPP, C.sub.10H.sub.12O.sub.3) are purchased from Sigma.

[0026] 2.3 experimental treatments: urea treatment (U), DCD + urea treatment, LN + urea treatment, MHPP + urea treatment, and 1,9-decanediol + urea treatment are set in experiments, in which an addition of DCD in soil is 20 mg/kg, and additions of LN, MHPP and 1,9-decanediol in soil each includes 100 mg/kg and 500 mg/kg, numbered as: DCD, LN-100, LN-500, MHPP-100, MHPP-500, 1,9-D-100, and 1,9-D-500. Each treatment is repeated three times. The nitrogen application rate is 200 mg nitrogen per kilogram soil.

2.4 Experimental Steps: The Same as the Test Example 1

2.5 Experimental Results

[0027] Compared with the urea treatment (U), the application of 1,9-decanediol, LN, and MHPP with different additions (100 and 500 mg/kg) can inhibit ammonia volatilization from soil. Among them, the ammonia volatilization from soil treated with 1,9-decanediol is significantly lower than that from soil treated with LN and MHPP. The inhibition effects of ammonia volatilization from high to low are: 1,9-D-500 > LN-500 > 1,9-D-100 >MHPP-500 > LN-100 > MHPP-100.