CN109463087B - Method for improving farmland acidified soil - Google Patents
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- CN109463087B CN109463087B CN201811451965.7A CN201811451965A CN109463087B CN 109463087 B CN109463087 B CN 109463087B CN 201811451965 A CN201811451965 A CN 201811451965A CN 109463087 B CN109463087 B CN 109463087B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/005—Following a specific plan, e.g. pattern
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
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Abstract
The invention discloses a method for improving farmland acidified soil, which comprises the steps of applying a base fertilizer and applying an additional fertilizer, wherein when the base fertilizer is applied, N-butyl thiophosphoryl triamide and aminoguanidine are respectively added according to the calculation of the nitrogen content of an organic fertilizer; when the topdressing fertilizer is applied, aminoguanidine and phenylhydrazine hydrochloride are respectively added according to different proportions according to the calculation of the nitrogen content of the topdressing nitrogen fertilizer. The whole improvement method overcomes the defects that the traditional improver is complex in operation, long in period and short in duration, heavy metal accumulation is easy to cause after long-term use, the physical and chemical properties of soil are deteriorated, and the like, can efficiently and quickly improve the pH value of acidified soil and improve the soil quality on the premise of ensuring the normal growth and yield of crops, and has the advantages of simplicity and convenience in operation, stable effect, long duration and the like.
Description
Technical Field
The invention relates to an improvement method, in particular to an improvement method of farmland acidified soil.
Background
Since the green industrial revolution of the 60's last century, the world's total food production has increased year by year, however, this greatly increased food production has been achieved in intensive agricultural production based on the application of large amounts of nitrogen fertilizer. China is a big agricultural country, the grain yield is increased from 3.25 hundred million tons in 1981 to 6.18 hundred million tons in 2017, the growth rate is 90.2 percent, and the use amount of nitrogen fertilizers is increased by 2-3 times and accounts for 35 percent of the global nitrogen fertilizer consumption.
The long-term excessive application of the farmland fertilizer promotes the nitrification of soil and NH in the soil4 +Rapid conversion to NH catalyzed by Ammonium Monooxygenase (AMO)2OH, and further to NO under the catalysis of hydroxylamine dehydrogenase (HAO)2 -Finally converted to NO3 -A large amount of the nitrogen is accumulated in the soil and far exceeds the growth requirement of crops, so that the nitrogen in the soil is excessively accumulated, and 90 percent of farmlands in China have acidification phenomena with different degrees. Meanwhile, the soil quality of the farmland is seriously deteriorated, and the production efficiency is greatly reduced. In addition, the unreasonable use of chemical fertilizers in farmland for a long time can also have serious adverse effects on the water quality of lakes and surface water and underground water resources, which is directly related to the water safety of people in peripheral areas. At the same time, a large amount of NO accumulated in the soil3 -And can be converted into N by denitrification2O is released into the atmosphere, which in turn leads to the greenhouse effect.
One of the major sources of these problems is due to the fact that the over-application of nitrogen fertilizers promotes nitrification of the soil. Therefore, the development and popularization of a novel production technology which can effectively improve the utilization rate of the nitrogen fertilizer and simultaneously can take economic benefits and environmental benefits into consideration is a task which is difficult and challenging to improve and acidify farmland cultivated land at present.
Disclosure of Invention
The invention mainly aims to provide a method for improving farmland acidified soil, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for improving acidified soil of a farmland comprises the steps of applying a base fertilizer and applying a top dressing, wherein when the base fertilizer is applied, N-butyl thiophosphoryl triamide and aminoguanidine are respectively added according to the nitrogen content of an organic fertilizer; when the topdressing fertilizer is applied, aminoguanidine and phenylhydrazine hydrochloride are respectively added according to different proportions according to the calculation of the nitrogen content of the topdressing nitrogen fertilizer.
Further, when the base fertilizer is applied, 1.0-2.0% of N-butyl thiophosphoric triamide and 0.5-2% of aminoguanidine are respectively added and mixed for application according to the nitrogen content of the organic fertilizer.
Further, the top dressing is divided into a seedling stage fertilizer, a first stage fertilizer for vegetative growth, a second stage fertilizer for vegetative growth, a third stage fertilizer for vegetative growth and a fertilizer for reproductive growth.
Further, the fertilizer is applied in the seedling stage according to the nitrogen content of the topdressing nitrogen fertilizer, and 0.5-1.0% of aminoguanidine and 0.3-0.5% of phenylhydrazine hydrochloride are respectively added and mixed for application; the first-stage fertilizer for vegetative growth, the second-stage fertilizer for vegetative growth and the second-stage fertilizer for vegetative growth are all applied according to the nitrogen content of the topdressing nitrogen fertilizer, and 1.0-3.0% of aminoguanidine and 0.5-1.0% of phenylhydrazine hydrochloride are respectively added and mixed for application; the fertilizer in the reproductive phase is applied by respectively adding 0.5-1.0% of aminoguanidine and 0.1-0.3% of phenylhydrazine hydrochloride according to the nitrogen content of the topdressing nitrogen fertilizer and mixing and applying.
Further, the method is applicable to wheat, corn and rice.
Compared with the prior art, the invention has the following beneficial effects:
(1) the N-butyl thiophosphoryl triamide (NBPT) can effectively inhibit the decomposition and mineralization of organic nitrogen in the base fertilizer and slow down the rate of converting urea into ammonia nitrogen, and has particularly remarkable effect in acidified soil; aminoguanidine (AG) as a copper chelating agent is effective in inhibiting the activity of ammonium monooxygenase, a catalytic enzyme in the first step of nitrification, and thus affecting NH4 +To NH2OH transformation, combination of two different proportions and synergistic effect remarkably inhibit mineralization of organic nitrogen fertilizers in base fertilizers and nitrification rate of ammonium nitrogen;
(2) aminoguanidine as copper ion chelating agent for effectively inhibitingThe activity of ammonium making monooxygenase (AMO), thereby significantly inhibiting the first reaction step of nitrification, namely NH4 +To NH2OH conversion; the phenylhydrazine hydrochloride (PHH) can effectively inhibit the activity of hydroxylamine dehydrogenase (HAO), thereby inhibiting the second step reaction of nitrification, namely NH2OH to NO2 -The two transformation methods are the nitrification inhibitors, but the two transformation methods have different action mechanisms and action sites, and the reasonable combination and the synergistic effect of the two transformation methods can obviously improve the inhibition efficiency of nitrification, and effectively prolong the action time of nitrification inhibition on the premise of reducing the application amount of the nitrification inhibitors and reducing the cost;
(3) the aminoguanidine aqueous solution is strongly alkaline, and can be reasonably mixed with the nitrogen fertilizer to obviously improve the pH value of the soil and improve the physical and chemical properties of the soil;
the whole improvement method overcomes the defects that the traditional improver is complex in operation, long in period and short in duration, heavy metal accumulation is easy to cause after long-term use, the physical and chemical properties of soil are deteriorated, and the like, can efficiently and quickly improve the pH value of acidified soil and improve the soil quality on the premise of ensuring the normal growth and yield of crops, and has the advantages of simplicity and convenience in operation, stable effect, long duration and the like.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The experiment is divided into an indoor experiment and a field experiment, the indoor experiment is to discharge multi-factor interference to prove that the synergistic action of the N-butyl thiophosphoryl triamide and the aminoguanidine and the synergistic action of the aminoguanidine and the phenylhydrazine hydrochloride have the regulation and control influence on the acidity of the soil, a theoretical basis is provided for the field experiment, the field experiment is a fitting practical application, and the effect of the scheme on the improvement of the acidity of the soil is proved.
First, indoor test
Synergistic study of N-butylthiophosphoric triamide (NBPT) and Aminoguanidine (AG)
The first step is as follows: the synergistic effect of NBPT and AG was investigated by the soil culture method, and experiments were carried out with four treatments of CK (urea only), NBPT (urea + 1.0% NBPT), AG (urea + 0.5% AG) and NBPT + AG (urea + 1.0% NBPT + 0.5% AG), with 3 replicates per treatment.
The second step is that: each treatment group was supplemented with urea at 280mg-N per kg of dry soil, and NBPT + AG was added according to the N content of urea.
The third step: and (3) placing the soil samples of each treatment group in a constant-temperature incubator at 25 ℃, culturing, periodically sampling, and detecting the contents of ammonium nitrogen and nitrate nitrogen in the soil samples by adopting an indophenol blue colorimetric method and a phenoldisulfonic acid colorimetric method respectively.
The fourth step: results show that the conversion rate of the ammonium nitrogen in the NBPT group is only 6.60mg/d and is significantly lower than that of the CK group and the AG group (p is less than 0.01), the minimum conversion rate of the ammonium nitrogen in the NBPT + AG treatment group is 2.00mg/d, the nitrification rate of the treatment group is only 2.27mg/d and is significantly lower than that of the CK group, the NBPT group and the AG group (p is less than 0.01), and the slow-release control effect on the base fertilizer is good (see table 1).
TABLE 1 comparison of the synergistic effects of AG and NBPT on the conversion and nitrification rate of soil ammonium nitrogen
Research on synergistic effect of (di) Aminoguanidine (AG) and phenylhydrazine hydrochloride (PHH)
The first step is as follows: the synergistic effect of AG and PHH was investigated by the soil culture method, and experiments were carried out by setting four treatments of CK (ammonium sulfate alone), AG (ammonium sulfate + 1.0% AG), PHH (ammonium sulfate + 0.5% PHH), and AG + PHH (ammonium sulfate + 1.0% AG + 0.5% PHH) to 3 times per treatment.
The second step is that: ammonium sulfate was added to each treatment group at 280mg-N per kg of dry soil, and AG and PHH were added in accordance with the N content of ammonium sulfate.
The third step: and (3) placing the soil samples of each treatment group in a constant-temperature incubator at 25 ℃, culturing, periodically sampling, and detecting the contents of ammonium nitrogen and nitrate nitrogen in the soil samples by adopting an indophenol blue colorimetric method and a phenoldisulfonic acid colorimetric method respectively.
The fourth step: results statistics, the results of 15-day experiments show that the nitrification rate of acidified soil is 5.80mg/d and 5.20mg/d respectively under the conditions of AG and PHH which are independently applied, and is far lower than that of CK (p is less than 0.01); however, the effect of the combination of AG and PHH is better, and the nitration rate of the PHH + AG treatment group is only 2.40mg/d, which is obviously lower than that of the CK group, the PHH group and the AG group (p is less than 0.01). The result shows that the combination of the two can effectively regulate and control the transformation of ammonium nitrogen in the soil, obviously reduce the residue of nitrate nitrogen in the soil and further obviously reduce the acidity of the soil, and the table 2 shows.
TABLE 2 comparison of the Effect of the synergism of AG and PHH on the inhibition of the nitrification activity of acidified soils
Note: different capital letters in the table indicate significant differences at the 0.01 level.
Second, field test
Xuyi and Jinhu three-land acidified soil test field in Hongze lake area of Jiangsu province
Example 1 (wheat)
According to the technical specification of wheat cultivation management, the method is divided into two parts of base fertilizer and additional fertilizer, wherein the base fertilizer accounts for about 60% of the total fertilizing amount, the additional fertilizer accounts for about 40%, and the additional fertilizer comprises seedling-stage fertilizer, first-stage fertilizer for vegetative growth, second-stage fertilizer for vegetative growth, third-stage fertilizer for vegetative growth and fertilizer for reproductive growth.
Three control groups CK are respectively arranged in the improvement experiment of the wheat acidified soil0、CK1、CK2And a treatment group T, each treatment is provided with 3 repetitions;
CK0the operation is completely carried out according to the traditional fertilization mode, and no reagent is added;
CK1only in the stage of base fertilizer, 1.0 percent of NBPT is added according to the nitrogen content (about 1.5 percent) of the organic fertilizer;
CK2except that 1.0 percent of NBPT is added in the stage of base fertilizer according to the nitrogen content of the organic fertilizer (about 1.5 percent), and in the stages of seedling stage, first vegetative growth stage, second vegetative growth stage, third vegetative growth stage and reproductive growth stage, the nitrogen content of the topdressing nitrogen fertilizer is calculatedCalculating, respectively applying PHH of 0.3%, 0.5% and 0.1%;
the treatment group T was added with NBPT, PHH and AG in the following (1) to (6) schedules in the basal fertilizer, seedling stage, first vegetative growth stage, second vegetative growth stage, third vegetative growth stage and reproductive growth stage, respectively:
(1) when the base fertilizer is applied: 1250Kg of organic fertilizer is applied to each mu according to the standard of wheat planting, and on the basis, 1.0 percent of NBPT (187.5g) and 2.0 percent of AG (93.8g) are mixed and applied according to the nitrogen content of the organic fertilizer (about 1.5%).
(2) When the fertilizer is applied in the seedling stage: after wheat seedlings are aligned, in order to promote the growth of seedlings and early tillering, 2.5Kg of urea is generally applied to each mu of land, and meanwhile, 0.5 percent of AG (5.9g) and 0.3 percent of PHH (3.5g) are respectively added and mixed according to the nitrogen content (47 percent) of the urea.
(3) When applying the nutrient growth first-stage fertilizer: in order to promote the tillering of wheat, urea (4Kg) is generally applied at the tillering stage of wheat, and 1.0% of AG (18.8g) and 0.5% of PHH (9.4g) are respectively added and mixed according to the nitrogen content (47%) of the urea.
(4) When the second-stage fertilizer for nutrition growth is applied: after winter, generally 1000Kg of organic fertilizer is applied to consolidate the tillering before winter and promote the young ear differentiation, and at this stage, 1.0 percent of AG (150g) and 0.5 percent of PHH (75g) are respectively added and mixed according to the nitrogen content of the organic fertilizer (about 1.5 percent).
(5) When applying the fertilizer for the third period of vegetative growth: in order to prevent premature senility of wheat and promote grain growth and weight gain, 6Kg of urea is generally added to each mu, and 1.0% of AG (28.2g) and 0.5% of PHH (14.1g) are respectively added according to the nitrogen content (47%) of the urea for mixed application.
(6) When applying reproductive growth fertilizer: in this period, in order to increase nutrition supply at ears and promote the development of reproductive organs, 2.5Kg of urea is generally applied per mu, and 0.5% AG (5.88g) and 0.1% PHH (1.18g) are respectively added according to the nitrogen content (47%) of the urea for mixed application.
The experimental results show that the soil acidification of the treatment group T (NBPT + PHH + AG) is obviously improved, the difference between the pH value and the control group reaches a 1% obvious level, and the rice yield is steadily increased (see table 3).
TABLE 3 comparison of pH value variation and acre yield of wheat acidified soil
Note: in the table, different capital letters indicate that the indexes in the same column are remarkably different at the level of 0.01, and lower case letters indicate that the indexes in the same column are remarkably different at the level of 0.05.
Example 2 (corn)
According to the technical specification of corn cultivation management, the corn fertilizer application is mainly divided into two parts of base fertilizer and additional fertilizer, wherein the base fertilizer accounts for about 40-50% of the total fertilizer application amount, the additional fertilizer accounts for about 50-60%, and the additional fertilizer comprises seedling-stage fertilizer, first-stage fertilizer for vegetative growth, second-stage fertilizer for vegetative growth, third-stage fertilizer for vegetative growth and fertilizer for reproductive growth.
Three control groups CK are respectively arranged in the improvement experiment of the acidified soil of the corn0、CK1、CK2And a treatment group T, each treatment is provided with 3 repetitions;
CK0the operation is completely carried out according to the traditional fertilization mode, and no reagent is added;
CK1only in the stage of base fertilizer, 1.5 percent of NBPT is added according to the nitrogen content (about 1.5 percent) of the organic fertilizer;
CK2except that 1.5 percent of NBPT is added in the stage of base fertilizer according to the nitrogen content of the organic fertilizer (about 1.5 percent), and 0.4 percent, 0.75 percent and 0.2 percent of PHH are additionally applied in the stages of seedling stage, first vegetative growth stage, second vegetative growth stage, third vegetative growth stage and reproductive growth stage respectively according to the nitrogen content of the additional nitrogen fertilizer;
the treatment group T was added with NBPT, PHH and AG in the following (1) to (6) schedules in the basal fertilizer, seedling stage, first vegetative growth stage, second vegetative growth stage, third vegetative growth stage and reproductive growth stage, respectively:
(1) when the base fertilizer is applied: 1500Kg of organic fertilizer, 30Kg of ordinary superphosphate and 40Kg of compound fertilizer are applied per mu according to the corn planting standard. On the basis of the nitrogen content of the organic fertilizer (about 1.5 percent), 1.5 percent of NBPT (337.5g) and 1.0 percent of AG (225g) are respectively added and mixed for dispensing.
(2) When the fertilizer is applied in the seedling stage: after the corn seedlings emerge, the growth of weak seedlings is promoted, and the growth speed of the corn seedlings in the field is ensured to be consistent. 50Kg of urea is applied to each mu of the field-effect fertilizer, and 0.75 percent of AG (176.5g) and 0.4 percent of PHH (94.0g) are respectively added and mixed for application according to the nitrogen content (47 percent) of the urea.
(3) When applying the nutrient growth first-stage fertilizer: in the seedling setting at the 5-leaf stage, in order to promote the growth of seedlings, intertillage ridging is generally combined, 10Kg of tapping fertilizer of urea is applied to each mu, and 2.0 percent of AG (94.0g) and 0.75 percent of PHH (35.3g) are respectively added and mixed for application according to the nitrogen content (47 percent) of the urea.
(4) When the second-stage fertilizer for nutrition growth is applied: when the length of the corn is about 40cm, 30Kg of urea seedling pulling fertilizer is applied to each mu of corn for rapidly finishing the growth of the corn, promoting the flowering phase and improving the growth efficiency of the corn, and meanwhile, 2.0 percent of AG (282.0g) and 0.75 percent of PHH (105.8g) are respectively added and mixed according to the nitrogen content (47 percent) of the urea for application.
(5) When applying the fertilizer for the third period of vegetative growth: 10 days before corn ear emergence, the ear-attacking fertilizer should be applied in combination with the ridging, and 20kg of urea and 15kg of potash fertilizer are generally applied per mu. Meanwhile, 2.0% AG (188g) and 0.75% PHH (70.5g) were dispensed, respectively, in terms of the nitrogen content of urea (47%).
(6) When applying the fertilizer in the reproductive period: before the corn plants are castrated, 10Kg of urea and 10Kg of potash fertilizer are generally applied, which is beneficial to keeping the leaf area to reach the maximum value, promoting the elongation of the top internodes, improving the illumination conditions of the upper part and the middle part, promoting the development of the ears and improving the vitality of pollen. At this stage, 0.75% AG (35.3g) and 0.2% PHH (9.4g) were added, respectively, based on the nitrogen content of urea (47%).
The experimental results show that the acidification of the T (NBPT + PHH + AG) soil of the treatment group is obviously improved, the difference between the pH value and the pH value of the control group reaches a 1% obvious level, and the corn yield is steadily increased (see table 4).
TABLE 4 comparison of pH value variation and acre yield of acidified soil from corn
Note: in the table, different capital letters indicate that the indexes in the same column are remarkably different at the level of 0.01, and lower case letters indicate that the indexes in the same column are remarkably different at the level of 0.05.
Example 3 (Rice)
According to the technical specification of rice cultivation management, the method is mainly divided into two parts of base fertilizer and additional fertilizer, wherein the base fertilizer accounts for about 60-80% of the total fertilizing amount, the additional fertilizer accounts for about 20-40%, and the additional fertilizer comprises seedling-stage fertilizer, first-stage fertilizer for vegetative growth, second-stage fertilizer for vegetative growth, third-stage fertilizer for vegetative growth and fertilizer for reproductive growth.
Three control groups CK are respectively arranged in the rice acidified soil improvement experiment0、CK1、CK2And a treatment group T, each treatment is provided with 3 repetitions;
CK0the operation is completely carried out according to the traditional fertilization mode, and no reagent is added;
CK1only in the stage of base fertilizer, 2.0 percent of NBPT is added according to the nitrogen content (about 1.5 percent) of the organic fertilizer;
CK2except that 2.0% of NBPT is added in the stage of base fertilizer according to the nitrogen content of the organic fertilizer (about 1.5%), 0.5%, 1.0% and 0.3% of PHH are applied in the stages of seedling stage, first vegetative growth stage, second vegetative growth stage, third vegetative growth stage and reproductive growth stage respectively according to the nitrogen content of the applied nitrogen fertilizer;
the treatment group T was added with NBPT, PHH and AG in the following (1) to (6) schedules in the basal fertilizer, seedling stage, first vegetative growth stage, second vegetative growth stage, third vegetative growth stage and reproductive growth stage, respectively:
(1) when the base fertilizer is applied: 2000Kg of organic fertilizer is applied per mu according to the standard of rice planting, and 2.0 percent of NBPT (600g) and 2.0 percent of AG (600g) are respectively added and mixed for application according to the nitrogen content (1.5 percent) of the organic fertilizer on the basis.
(2) When the fertilizer is applied in the seedling stage: after 2 half leaves of rice are easy to lose fertilizer, in this period, 7Kg of urea is generally applied to each mu in order to promote the growth of seedlings, and meanwhile, 1.0 percent of AG (32.9g) and 0.5 percent of PHH (16.5g) are added and mixed according to the nitrogen content (47 percent) of the urea.
(3) When applying the nutrient growth first-stage fertilizer: after the rice seedlings are transplanted, when new roots grow to be about 10cm, the striking root manure can be applied according to 2Kg per mu, so as to promote the new leaves to be born quickly and tillering as early as possible. Meanwhile, 1.0% AG (9.4g) and 0.5% PHH (4.7g) were added and mixed, respectively, in terms of the nitrogen content (47%) of urea.
(4) When the second-stage fertilizer for nutrition growth is applied: this stage is the main stage of vegetative growth such as root growth, leaf growth, tillering, etc., and is also the key stage in determining the number of ears. Therefore, the method aims to promote the early and fast growth of rice tillering and increase effective tillering. At this stage, 2.5Kg of urea is generally applied per mu, and 3.0% AG (35.3g) and 1.0% PHH (11.8g) are added separately according to the nitrogen content (47%) of urea.
(5) When applying the fertilizer for the third period of vegetative growth: when the rice grows to 10 leaves, the young ears begin to differentiate, in the period, in order to promote the differentiation of the ears, the branches and the stalks and the number of flowers at one time and increase the number of the branches at one time, 7Kg of urea is generally added per mu, and 3.0 percent of AG (98.7g) and 1.0 percent of PHH (32.9g) are respectively added according to the nitrogen content (47 percent) of the urea.
(6) When applying the fertilizer in the reproductive period: the vegetative growth and reproductive growth are in parallel at this stage, young ears are rapidly differentiated and formed, and tillers are transformed to the two poles. In order to consolidate the effective tillering and improve the grain number per ear, 5Kg of urea is applied to each mu generally. Meanwhile, 1.0% AG (23.5g) and 0.3% PHH (7.1g) were added and mixed, respectively, in terms of the nitrogen content (47%) of urea.
The experimental results show that the soil acidification of the treatment group T (NBPT + PHH + AG) is obviously improved, the difference between the pH value and the control group reaches a 1% obvious level, and the rice yield is steadily increased (see table 5).
TABLE 5 comparison of pH change and acre yield in acidified soil of rice
Note: in the table, different capital letters indicate that the indexes in the same column are remarkably different at the level of 0.01, and lower case letters indicate that the indexes in the same column are remarkably different at the level of 0.05.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A method for improving farmland acidified soil is characterized by comprising the following steps: the method comprises the steps of applying a base fertilizer and applying an additional fertilizer, wherein 1.0-2.0% of N-butyl thiophosphoryl triamide and 0.5-2% of aminoguanidine are respectively added and mixed for application according to the nitrogen content of the organic fertilizer when the base fertilizer is applied; when the additional fertilizer is applied, the additional fertilizer is divided into a fertilizer in a seedling stage, a fertilizer in a first vegetative growth stage, a fertilizer in a second vegetative growth stage, a fertilizer in a third vegetative growth stage and a fertilizer in a reproductive growth stage, wherein the fertilizer in the seedling stage is applied by respectively adding 0.5-1.0% of aminoguanidine and 0.3-0.5% of phenylhydrazine hydrochloride and mixing and applying according to the nitrogen content of the additional fertilizer; the first-stage fertilizer for vegetative growth, the second-stage fertilizer for vegetative growth and the second-stage fertilizer for vegetative growth are all applied according to the nitrogen content of the topdressing nitrogen fertilizer, and 1.0-3.0% of aminoguanidine and 0.5-1.0% of phenylhydrazine hydrochloride are respectively added and mixed for application; the fertilizer in the reproductive phase is applied by respectively adding 0.5-1.0% of aminoguanidine and 0.1-0.3% of phenylhydrazine hydrochloride according to the nitrogen content of the topdressing nitrogen fertilizer and mixing and applying.
2. The method for improving acidified soil in agricultural field according to claim 1, wherein: the method is suitable for wheat, corn and rice.
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| 生化抑制剂组合与施肥模式对黄泥田稻季氨挥发的影响;周旋等;《农业环境科学报》;20180220;第399-408页 * |
| 盐酸苯肼的合成;章茹等;《南昌大学学报（理科版）》;20021231;第26卷(第4期);第394-396页 * |
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