Cultivation method of selenium-enriched durian

Abstract

The invention belongs to the technical field of selenium-rich plant cultivation, and particularly relates to a selenium-rich durian cultivation method. According to the method, the selenium-rich durian is produced by spraying exogenous selenium fertilizer to leaves or fruits for multiple times in different development stages of the durian fruits, and the selenium supplementing stages comprise two or more of the young fruit stage of durian fruit development, the initial stage of fruit expansion, the middle stage of fruit expansion and the fruit coloring stage; the selenium supplementing mode is to spray an exogenous selenium fertilizer on the surfaces of leaves or fruits of durian plants; the number of times of selenium supplement is 2-4; the selenium fertilizer comprises selenium yeast, nano-selenium and selenium amino acid. By means of the cultivation method, the content of organic selenium and the content of total selenium in durian pulp can be greatly increased, meanwhile, the quality of durian fruits can be improved, the storage period of the fruits can be prolonged, and the method is easy to operate, good in effect, relatively low in cost and suitable for large-scale planting.

Description

Technical Field

[0001] The present invention belongs to the technical field of selenium-rich plant cultivation, and particularly relates to a cultivation method for selenium-rich durians. Background Art

[0002] Durian is a tropical fruit with a unique flavor and rich nutrition. It has a strong special smell due to the presence of esters, alcohols, aldehydes, ketones, acids, and sulfur-containing volatile organic compounds, and is a fruit with extremely high economic value. Given the huge demand for durians in the Chinese market, the introduction and cultivation of durians have begun in many places in China. However, since it requires a year-round high-temperature climate to grow and bear fruit, it has only been successfully trial-planted in a few areas, and the fruit quality is relatively poor.

[0003] In addition to the decline in quality, the durians currently on the market generally have problems such as low product added value and lack of core market competitiveness, and new cultivation control measures need to be developed urgently.

[0004] Selenium is one of the essential trace nutrients for humans, participating in the synthesis of various enzymes in the human body. Lack of selenium will cause the occurrence of various diseases. Research shows that supplementing selenium can enhance the body's immunity, play a role in cancer prevention and anti-cancer, and delaying aging. According to statistics, more than 70% of the regions in China have problems with insufficient daily selenium intake. Selenium is also a beneficial element required for plant growth, having the effects of stimulating plant growth and development, improving crop yield and quality, enhancing the biological antioxidant effect of plants, promoting plant metabolism and plant resistance to environmental stress, and having an antagonistic effect on heavy metals. Therefore, in the cultivation process of durians, if appropriate measures can be taken to increase the selenium content in the fruit and produce selenium-rich durians, it will not only increase the product added value but also improve the fruit quality.

[0005] Based on this, we have proposed a cultivation method for selenium-rich durians, hoping to solve the deficiencies in the existing technology. Summary of the Invention

[0006] The purpose of the present invention is to provide a cultivation method for selenium-rich durians in view of the existing problems.

[0007] The present invention is achieved through the following technical solutions:

[0008] A cultivation method for selenium-rich durians, applying exogenous selenium fertilizer and compound fertilizer during the growth period of durians;

[0009] The application method of the exogenous selenium fertilizer is to spray the exogenous selenium fertilizer on the leaves and fruit surfaces of durian plants simultaneously;

[0010] The exogenous selenium fertilizer includes yeast selenium, nano-selenium, and amino acid selenium;

[0011] The application periods of the exogenous selenium fertilizer include two or more of the young fruit stage, the initial fruit expansion stage, the middle fruit expansion stage, and the fruit color-changing stage during the development of durian fruits.

[0012] More preferably, the number of times of spraying the selenium fertilizer is 2 to 4 times.

[0013] More preferably, the spraying concentration of the exogenous selenium fertilizer is 20 to 2000 mg / L.

[0014] More preferably, the content of organic selenium in the yeast selenium is not less than 2000 mg / kg, and the yeast selenium is dissolved in water to prepare a selenium fertilizer with a concentration of 1000 to 4000 mg / L.

[0015] More preferably, the nano selenium is dissolved in water to prepare a selenium fertilizer with a concentration of 10 to 20 mg / L.

[0016] More preferably, the amino acid selenium includes selenomethionine, selenocysteine, selenocystine, methylselenomethionine, and methylselenocysteine, and the amino acid selenium is dissolved in water to prepare a selenium fertilizer with a concentration of 20 to 100 mg / L.

[0017] More preferably, 0 to 0.2% of potassium dihydrogen phosphate is added during the spraying of the selenium fertilizer.

[0018] More preferably, the application periods of the compound fertilizer are the new branch and leaf sprouting stage of durian, the initial fruit expansion stage of durian, and after the completion of durian fruit harvesting.

[0019] More preferably, the specific application method of the compound fertilizer is as follows:

[0020] During the new branch and leaf sprouting stage of durian, 2 to 5 kg of compound fertilizer is applied to each tree by root application;

[0021] During the initial fruit expansion stage of durian, 2 to 5 kg of compound fertilizer is applied to each tree by root application;

[0022] After the completion of durian fruit harvesting, 2 to 5 kg of compound fertilizer is applied to each tree by root application.

[0023] More preferably, during the new branch and leaf sprouting stage of durian, the ratio of nitrogen, phosphorus, and potassium in the compound fertilizer is 10:20:12;

[0024] During the initial fruit expansion stage of durian, the ratio of nitrogen, phosphorus, and potassium in the compound fertilizer is 10:10:20;

[0025] After the completion of durian fruit harvesting, the ratio of nitrogen, phosphorus, and potassium in the compound fertilizer is 20:10:10.

[0026] The present invention has the following advantages compared with the prior art:

[0027] The present invention produces selenium-enriched durians by spraying exogenous selenium fertilizers on leaves or fruits multiple times during different development stages of durian fruits. The selenium supplementation periods include two or more of the young fruit stage, the initial fruit expansion stage, the middle fruit expansion stage, and the fruit color change stage during the development of durian fruits. The selenium supplementation method is to spray exogenous selenium fertilizers on the surfaces of the leaves or fruits of durian plants. The number of selenium supplementation times is 2 to 4 times. The selenium fertilizers include yeast selenium, nano selenium, and amino acid selenium. By using the cultivation method of the present invention, not only can the contents of organic selenium and total selenium in durian pulp be greatly increased, but also it helps to improve the quality of durian fruits and extend the fruit storage period. This method is simple to operate, has excellent effects, and relatively low costs, and is suitable for large-scale cultivation. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Example 1

[0030] An experiment was conducted in the durian production area of Chanthaburi, Thailand. 30 'Kan Yao' durian trees with consistent growth vigor and normal fruiting were selected and randomly divided into an experimental group and a control group, with 15 trees in each group. Selenium-enriched cultivation was carried out according to the scheme of the present invention, and pest and disease control was carried out according to conventional cultivation management measures during the period. In the control group, the selenium fertilizer was replaced with clear water, and other conditions remained unchanged. The experimental time was from August 2022 to June 2023.

[0031] 1) During the new branch and leaf shooting stage of 'Kan Yao' durians, 3 kg of compound fertilizer (nitrogen-phosphorus-potassium ratio of 10:20:12) was applied to each tree root to promote flowering;

[0032] 2) During the young fruit stage of 'Kan Yao' durians (fruit diameter about 1 cm), 20 mg / L of selenomethionine and 0.1% potassium dihydrogen phosphate were sprayed on the leaves and fruit surfaces of each tree until the leaves dripped with water;

[0033] 3) During the initial fruit expansion stage of 'Kan Yao' durians (fruit diameter about 3 cm), 50 mg / L of selenomethionine and 0.2% potassium dihydrogen phosphate were sprayed on the leaves and fruit surfaces of each tree, and 2 kg of compound fertilizer (nitrogen-phosphorus-potassium ratio of 10:10:20) was applied to each tree root to promote fruit development and quality improvement;

[0034] 4) During the middle fruit expansion stage of 'Kan Yao' durians (fruit diameter about 6 - 10 cm), 50 mg / L of selenomethionine and 0.2% potassium dihydrogen phosphate were sprayed on the leaves and fruit surfaces of each tree until the leaves dripped with water;

[0035] 5) During the color change period of the 'Monthong' durian fruit, spray 50 mg / L of selenomethionine and 0.2% potassium dihydrogen phosphate on the leaves and fruit surface of each tree until the leaves are dripping wet.

[0036] 6) After harvesting the 'Monthong' durian fruit, apply 5 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio of 20:10:10) to the roots of each tree to restore the tree's nutrition.

[0037] Take different parts of the durian fruit harvested in Example 1 of the present invention for selenium content detection and analysis. The detection results are shown in Table 1. The average total selenium content in the pulp of the experimental group is 0.036 mg / kg, which is 4 times that of the control group; the average total selenium content in the peel of the experimental group is 0.107 mg / kg, which is 6 times that of the control group; the average total selenium content in the fruit stalk of the experimental group is 0.200 mg / kg, which is 10 times that of the control group.

[0038] Table 1 Total selenium content in different parts of 'Monthong' durian fruit under selenium-enriched cultivation

[0039]

[0040]

[0041] Take the durian fruit harvested in Example 1 of the present invention for quality detection and analysis. The detection results are shown in Table 2. The quality-related indexes such as soluble solids, soluble sugar, sugar-acid ratio, soluble protein, vitamin C, cellulose, potassium ion and SOD enzyme activity in the pulp of the experimental group are all significantly higher than those of the control group.

[0042] Table 2 Quality analysis of 'Monthong' durian fruit under selenium-enriched cultivation

[0043] Fruit quality-related indicators Experimental group Control group Soluble solids 33.3％ 29.7％ Soluble sugar 15.0％ 11.9％ Titratable acid 0.77％ 0.74％ Sugar-acid ratio 19.5 16.2 Soluble protein 7.67 mg / g 7.59 mg / g Vitamin C 39.2 mg / kg 38 mg / kg Cellulose 59.6 mg / g 49.6 mg / g Potassium ion 32.0 mg / g 29.7 mg / g SOD enzyme activity 241 U / g 200 U / g

[0044] Example 2

[0045] An experiment was conducted in the Chanthaburi durian production area in Thailand. Twenty 'Monthong' durian trees with consistent growth vigor and normal fruiting were selected and randomly divided into an experimental group and a control group, with 10 trees in each group. Selenium-enriched cultivation was carried out according to the scheme described in the present invention, and pest and disease control was carried out according to conventional cultivation management measures during the period. In the control group, the selenium fertilizer was replaced with clear water, and other conditions remained unchanged. The experimental time was from June 2023 to June 2024.

[0046] 1) During the new shoot growth period of the 'Monthong' durian, apply 2 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio of 10:20:12) to the roots of each tree to promote flowering.

[0047] 2) During the young fruit stage of 'Musang King' durian (fruit diameter about 1 cm), spray 1000 mg / L of yeast selenium on the leaves and fruit surface of each tree until the leaves are dripping wet.

[0048] 3) During the initial stage of fruit swelling of 'Musang King' durian (fruit diameter about 3 cm), spray 2000 mg / L of yeast selenium on the leaves and fruit surface of each tree, and apply 2 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 10:10:20) to the roots of each tree to promote fruit development and quality improvement.

[0049] 4) During the middle stage of fruit swelling of 'Musang King' durian (fruit diameter about 6 - 10 cm), spray 2000 mg / L of yeast selenium on the leaves and fruit surface of each tree until the leaves are dripping wet.

[0050] 5) During the fruit color - turning stage of 'Musang King' durian, spray 2000 mg / L of yeast selenium on the leaves and fruit surface of each tree until the leaves are dripping wet.

[0051] 6) After harvesting the 'Musang King' durian fruits, apply 5 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 20:10:10) to the roots of each tree to restore the tree's nutrition.

[0052] Take the pulp and peel of the durian fruits harvested in Example 2 of the present invention for selenium content detection and analysis. The detection results show that the average total selenium content in the pulp of the experimental group is 0.052 mg / kg, and the average total selenium content in the pulp of the control group is 0.008 mg / kg. The experimental group is 6.5 times that of the control group; the average total selenium content in the peel of the experimental group is 0.175 mg / kg, and the average total selenium content in the peel of the control group is 0.013 mg / kg. The experimental group is 13.5 times that of the control group.

[0053] Example 3

[0054] An experiment was conducted in the durian production area of Malaysia. Select 20 'Black Thorn' durian trees with consistent growth vigor and normal fruiting, randomly divide them into an experimental group and a control group, with 10 trees in each group. Carry out selenium - rich cultivation according to the scheme described in the present invention, and conduct pest and disease control according to conventional cultivation management measures during the period. In the control group, the selenium fertilizer was replaced with clear water, and other conditions remained unchanged. The experimental time was from January 2023 to June 2024.

[0055] 1) During the new branch and leaf shooting stage of 'Black Thorn' durian, apply 3 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 10:20:12) to the roots of each tree to promote flowering.

[0056] 2) During the young fruit stage of 'Black Thorn' durian (fruit diameter about 1 cm), spray the amino acid water - soluble selenium fertilizer diluted 1000 times (main component is selenomethionine, concentration 20 mg / ml) on the leaves and fruit surface of each tree until the leaves are dripping wet.

[0057] 3) At the initial stage of fruit swelling of 'Black Thorn' durian (fruit diameter about 3 cm), spray the amino acid water-soluble selenium fertilizer diluted 1000 times on the leaves and fruit surface of each tree, and apply 2 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 10:10:20) to each tree root to promote fruit development and quality improvement;

[0058] 4) At the middle stage of fruit swelling of 'Black Thorn' durian (fruit diameter about 6 - 10 cm), spray the amino acid water-soluble selenium fertilizer diluted 1000 times on the leaves and fruit surface of each tree until the leaves drip with water;

[0059] 5) At the fruit color-changing stage of 'Black Thorn' durian, spray the amino acid water-soluble selenium fertilizer diluted 1000 times on the leaves and fruit surface of each tree until the leaves drip with water;

[0060] 6) After harvesting the 'Black Thorn' durian fruits, apply 5 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 20:10:10) to each tree root to restore the tree body nutrition.

[0061] Take the pulp and peel of the durian fruits harvested in Example 3 of the present invention for selenium content detection and analysis. The detection results show that the average total selenium content in the pulp of the experimental group is 0.044 mg / kg, and the average total selenium content in the pulp of the control group is 0.007 mg / kg. The experimental group is 6.3 times that of the control group; the average total selenium content in the peel of the experimental group is 0.127 mg / kg, and the average total selenium content in the peel of the control group is 0.015 mg / kg. The experimental group is 8.4 times that of the control group.

[0062] Take the durian fruits harvested in Example 3 of the present invention for quality detection and analysis. The detection results are shown in Table 3. The quality-related indexes such as soluble solids, soluble protein, cellulose, and CAT enzyme activity in the pulp of the experimental group are significantly higher than those of the control group.

[0063] Table 3 Quality analysis of 'Black Thorn' durian fruits cultivated with selenium enrichment

[0064] Fruit quality-related indicators Experimental group Control group Soluble solids 36.68％ 35.68％ Soluble sugar 6.68％ 6.83％ Titratable acid 0.10％ 0.13％ Soluble protein 15.6 mg / g 14.4 mg / g Vitamin C 17.9 mg / kg 18.8 mg / kg Cellulose 54.0 mg / g 29.1 mg / g SOD enzyme activity 343 U / g 356 U / g POD enzyme activity 394 U / g 411 U / g CAT enzyme activity 28.8 U / g 7.1 U / g

[0065] Example 4

[0066] An experiment was conducted in the durian production area of Malaysia. Select 20 'Black Thorn' durian trees with consistent growth potential and normal fruiting, randomly divide them into an experimental group and a control group, with 10 trees in each group. Carry out selenium-enriched cultivation according to the scheme described in the present invention, and conduct pest control according to conventional cultivation management measures during the period. In the control group, the selenium fertilizer was replaced with clean water, and other conditions remained unchanged. The experimental time was from January 2023 to June 2024.

[0067] 1) At the new branch and leaf shooting stage of 'Black Thorn' durian, apply 3 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 10:20:12) to each tree root to promote flowering;

[0068] 2) During the young fruit stage of 'Black Thorn' durian (fruit diameter about 1 cm), spray 10 mg / L of nano-selenium fertilizer and 0.1% potassium dihydrogen phosphate on the leaves and fruit surface of each tree until the leaves drip with water;

[0069] 3) At the initial stage of fruit swelling of 'Black Thorn' durian (fruit diameter about 3 cm), spray 10 mg / L of nano-selenium fertilizer and 0.2% potassium dihydrogen phosphate on the leaves and fruit surface of each tree, and apply 2 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 10:10:20) to each tree root to promote fruit development and quality improvement;

[0070] 4) During the middle stage of fruit swelling of 'Black Thorn' durian (fruit diameter about 6 - 10 cm), spray 10 mg / L of nano-selenium fertilizer and 0.2% potassium dihydrogen phosphate on the leaves and fruit surface of each tree until the leaves drip with water;

[0071] 5) During the fruit color change stage of 'Black Thorn' durian, spray 10 mg / L of nano-selenium fertilizer and 0.1% potassium dihydrogen phosphate on the leaves and fruit surface of each tree until the leaves drip with water;

[0072] 6) After harvesting the 'Black Thorn' durian fruits, apply 5 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio is 20:10:10) to each tree root to restore the tree body nutrition.

[0073] Take the pulp and pericarp of the durian fruits harvested in Example 4 of the present invention for selenium content detection and analysis. The detection results show that the average total selenium content in the pulp of the experimental group is 0.056 mg / kg, and the average total selenium content in the pulp of the control group is 0.007 mg / kg. The experimental group is 8 times that of the control group; the average total selenium content in the pericarp of the experimental group is 0.142 mg / kg, and the average total selenium content in the pericarp of the control group is 0.015 mg / kg. The experimental group is 9.5 times that of the control group.

[0074] Take the durian fruits harvested in Example 4 of the present invention for quality detection and analysis. The detection results are shown in Table 4. The quality-related indexes such as cellulose, SOD, POD, and CAT enzyme activities in the pulp of the experimental group are significantly higher than those of the control group.

[0075] Table 4 Quality analysis of 'Black Thorn' durian fruits cultivated with selenium enrichment

[0076] Fruit quality-related indicators Experimental group Control group Soluble solids 33.56％ 35.68％ Soluble sugar 6.44％ 6.83％ Titratable acid 0.22％ 0.13％ Soluble protein 13.7 mg / g 14.4 mg / g Vitamin C 17.2 mg / kg 18.8 mg / kg Cellulose 39.9 mg / g 29.1 mg / g SOD enzyme activity 447 U / g 356 U / g POD enzyme activity 542 U / g 411 U / g CAT enzyme activity 30.8 U / g 7.1 U / g

[0077] Example 5

[0078] Experiments were conducted in the Sanya area of Hainan. Ten 'Kennedy' durian trees with consistent growth vigor and normal fruiting were selected and randomly divided into an experimental group and a control group, with 5 trees in each group. Selenium-enriched cultivation was carried out according to the scheme described in the present invention, and pest control was carried out according to conventional cultivation management measures during the period. In the control group, the selenium fertilizer was replaced with clear water, and other conditions remained unchanged. The experimental time was from June 2023 to August 2023.

[0079] 1) During the shoot growth period of the new branches and leaves of 'Kennedy' durian, 3 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio of 10:20:12) was applied to the roots of each tree to promote flowering;

[0080] 2) During the young fruit period of 'Kennedy' durian (fruit diameter about 1 cm), 20 mg / L of selenomethionine was sprayed on the leaves and fruit surface of each tree until the leaves were dripping wet;

[0081] 3) At the initial stage of fruit swelling of 'Kennedy' durian (fruit diameter about 3 cm), 50 mg / L of selenomethionine was sprayed on the leaves and fruit surface of each tree, and 2 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio of 10:10:20) was applied to the roots of each tree to promote fruit development and quality improvement;

[0082] 4) During the middle stage of fruit swelling of 'Kennedy' durian (fruit diameter about 6 - 10 cm), 50 mg / L of selenomethionine was sprayed on the leaves and fruit surface of each tree until the leaves were dripping wet;

[0083] 5) During the fruit color-changing period of 'Kennedy' durian, 50 mg / L of selenomethionine was sprayed on the leaves and fruit surface of each tree until the leaves were dripping wet;

[0084] 6) After the 'Kennedy' durian fruits were harvested, 5 kg of compound fertilizer (nitrogen:phosphorus:potassium ratio of 20:10:10) was applied to the roots of each tree to restore the tree body nutrition.

[0085] The pulp of the durian fruits harvested in Example 5 of the present invention was taken for selenium content detection and analysis. The detection results showed that the average total selenium content in the pulp of the experimental group was 0.062 mg / kg, and the average total selenium content in the pulp of the control group was 0.008 mg / kg. The experimental group was 7.8 times that of the control group.

[0086] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cultivation method for selenium-enriched durian, characterized in that, Apply exogenous selenium fertilizer and compound fertilizer during the growth period of durian; The exogenous selenium fertilizer is applied by spraying the exogenous selenium fertilizer on the leaves and fruit surfaces of the durian plant at the same time; The exogenous selenium fertilizer includes yeast selenium, nano selenium, and amino acid selenium; The application period of the exogenous selenium fertilizer includes two or more periods of the young fruit stage, the early fruit expansion stage, the middle fruit expansion stage and the fruit color change stage of durian fruit development.

2. A cultivation method for selenium-rich durian according to claim 1, characterized in that, The number of times of spraying selenium fertilizer is 2 to 4 times.

3. A cultivation method for selenium-rich durian according to claim 1, characterized in that, The spraying concentration of the exogenous selenium fertilizer is 20-2000 mg / L.

4. A cultivation method for selenium-rich durian according to claim 1, characterized in that, The content of organic selenium in the yeast selenium is not less than 2000 mg / kg, and the yeast selenium is dissolved in water to form a selenium fertilizer with a concentration of 1000-4000 mg / L.

5. A cultivation method for selenium-enriched durian according to claim 1, characterized in that, The nano-selenium is dissolved in water to prepare selenium fertilizer with a concentration of 10-20 mg / L.

6. A cultivation method for selenium-rich durian according to claim 1, characterized in that, The amino acid selenium includes selenomethionine, selenocysteine, selenocysteine, methylselenomethionine and methylselenocysteine. The amino acid selenium is dissolved in water to form a selenium fertilizer with a concentration of 20-100 mg / L.

7. A cultivation method for selenium-rich durian according to claim 1, characterized in that, The selenium fertilizer is added with 0-0.2% potassium dihydrogen phosphate when sprayed.

8. A cultivation method for selenium-enriched durian according to claim 1, characterized in that, The compound fertilizer is applied during the period when new branches and leaves of durian sprout, the early stage of durian fruit expansion, and after the durian fruit is harvested.

9. A cultivation method for selenium-enriched durian according to claim 8, characterized in that, The specific application method of the compound fertilizer is: During the period of new branches and leaves of durian, apply 2 to 5 kg of compound fertilizer to each tree root; At the early stage of durian fruit expansion, apply 2 to 5 kg of compound fertilizer to each tree root; After the durian fruits are harvested, apply 2 to 5 kilograms of compound fertilizer to each tree root.

10. A cultivation method for selenium-enriched durian according to claim 9, characterized in that, During the period of new branches and leaves of durian, the ratio of nitrogen, phosphorus and potassium in compound fertilizer is 10:20:12; In the early stage of durian fruit expansion, the ratio of nitrogen, phosphorus and potassium in compound fertilizer is 10:10:20; After the durian fruits are harvested, the ratio of nitrogen, phosphorus and potassium in the compound fertilizer is 20:10:10.

Images