A liquid fertilizer for increasing the calcium content in the pulp of mango fruits, its preparation method, usage method and application

Abstract

The present invention provides a liquid fertilizer for increasing the calcium content in the pulp of mango fruits, as well as its preparation method, usage method and application, belonging to the technical field of fruit tree cultivation. The liquid fertilizer of the present invention comprises the following components: inositol 300-700 μmol / L, L-tryptophan 0.5-1.5 g / L, Ca(NO3)2 0.1-0.5 g / L. By using the liquid fertilizer of the present invention in combination with a specific spraying method and spraying timing, the calcium content in the pulp of mango fruits can be increased by 55.1%, the incidence rate of fruit core rot can be reduced, and the planting income of fruit farmers can be effectively guaranteed. Moreover, since the liquid fertilizer provided by the present invention is a plant endogenous substance, it is safe for plants and animals, belongs to a green active agent, and conforms to the green development strategy of the agricultural industry. Therefore, it is suitable for large-scale popularization and application.

Description

Technical Field

[0001] The present invention belongs to the technical field of fruit tree cultivation, and particularly relates to a liquid fertilizer for increasing the calcium content in the pulp of mango fruits, and its preparation method, usage method and application. Background Art

[0002] Mangoes are deeply loved by people because of their sweet taste, juicy pulp and rich in various nutrients. However, restricted by both resources and the environment, the development of the mango industry is affected. And in some areas, affected by the weather, the quality of mango fruits is not high. Especially in recent years, the phenomenon of fruit core rot has occurred frequently and highly in various production areas. The fruit core rot rate in some orchards is as high as more than 40%. After the mango fruit has core rot, the pulp at the diseased part turns brown and lignifies, with a pungent and putrid smell, resulting in the fruit losing its edible value, and thus seriously affecting the planting income of fruit farmers. Research shows that mango fruit core rot is a physiological disease caused by calcium deficiency in the fruit. To correct mango fruit core rot, the commonly used measure in production is to apply calcium fertilizer through the soil or leaves. However, the traditional fertilization method lacks scientificity and the fertilization effect is not obvious. There are mainly two traditional ways to apply calcium fertilizer: one is to apply calcium fertilizer through soil application. Since the calcium in the soil is mainly transported to the above-ground part by transpiration flow after being absorbed by the roots, and the transpiration rate of the fruit is much lower than that of the leaves, the fruit obtains less calcium from the soil through transpiration flow. It is very difficult to increase the calcium content of mango fruits by soil application, and it cannot effectively reduce the fruit core rot rate of mango fruits; the other is to increase the calcium content of the fruit by spraying calcium fertilizer on the leaves. However, research has found that the existing calcium fertilizers can only effectively increase the calcium content in the mango peel, but cannot effectively increase the calcium content in the pulp. On the other hand, in production, calcium fertilizer is mostly sprayed during the fruit expansion period, and this period is not the key period for mango fruit calcium absorption, further reducing the effect of increasing the calcium content in the pulp by spraying calcium fertilizer on the leaves.

[0003] In view of the above problems, it is urgent to develop a fertilizer that can increase the calcium content in the pulp of mango fruits, so as to improve the fruit quality of mangoes and solve the problem of high fruit core rot rate, and ensure the planting income of fruit farmers. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a liquid fertilizer for increasing the calcium content in the pulp of mango fruits, and its preparation method, usage method and application. The present invention obtains a liquid fertilizer by mixing a saccharide substance inositol with L-tryptophan and Ca(NO3)2 in a certain proportion and concentration. By combining this liquid fertilizer with a reasonable leaf spraying time, the calcium content in mango fruits, especially in the pulp, is significantly increased, the incidence of fruit core rot is reduced, and the planting income of fruit farmers is effectively guaranteed.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a liquid fertilizer for increasing the calcium content in the pulp of mango fruits. Using water as a solvent, it includes components with the following concentrations: inositol 100 - 700 μmol / L, L-tryptophan 0.5 - 1.5 g / L, and Ca(NO3)2 0.1 - 0.5 g / L.

[0007] Preferably, using water as a solvent, it includes components with the following concentrations: inositol 300 - 600 μmol / L, L-tryptophan 0.7 - 1.2 g / L, and Ca(NO3)2 0.2 - 0.4 g / L.

[0008] More preferably, using water as a solvent, it includes components with the following concentrations: inositol 500 μmol / L, L-tryptophan 1.0 g / L, and Ca(NO3)2 0.3 g / L.

[0009] The present invention also provides a method for preparing the liquid fertilizer, which includes the following steps: mixing inositol, L-tryptophan, Ca(NO3)2, and water.

[0010] The present invention also provides a method for using the liquid fertilizer, which is to spray the liquid fertilizer after the full bloom of mangoes.

[0011] Preferably, the spraying period is 8 - 12 days after the full bloom.

[0012] Preferably, after the full bloom means 90% of the flowers have withered.

[0013] Preferably, the number of spraying times is 1 - 5 times, and the interval days between two adjacent sprayings are 12 - 17 days.

[0014] Preferably, the spraying amount is 20 - 40 kg / mu·time.

[0015] The present invention also provides the application of the liquid fertilizer in increasing the calcium content in the pulp of mango fruits.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for increasing the calcium content in the pulp of mango fruits by using the saccharide substance inositol. Inositol is a saccharide substance widely present in the biological world and participates in various physiological and biochemical processes in plants. Inositol phospholipid metabolism is related to calcium ion signal transduction and together regulates the physiological and biochemical reactions in plant cells. The present invention obtains a liquid fertilizer by mixing inositol with L-tryptophan and Ca(NO3)2 in a certain proportion concentration, and with a specific spraying method and spraying timing, the calcium content in the pulp of mango fruits is increased by 55.1%, the incidence of fruit core rot is reduced, and the planting income of fruit farmers is effectively guaranteed. Moreover, the liquid fertilizer provided by the present invention is an endogenous substance in plants, safe for plants and animals, belongs to a green active agent, conforms to the green development strategy of the agricultural industry, and is suitable for large-scale popularization and application. Detailed Embodiments

[0017] The present invention provides a liquid fertilizer for increasing the calcium content in the pulp of mango fruits, with water as the solvent, and comprising components with the following concentrations:

[0018] Inositol 100 - 700 μmol / L, preferably 300 - 600 μmol / L, and more preferably 500 μmol / L;

[0019] L-tryptophan 0.5 - 1.5 g / L, preferably 0.7 - 1.2 g / L, and more preferably 1.0 g / L;

[0020] Ca(NO3)2 0.1 - 0.5 g / L, preferably 0.2 - 0.4 g / L, and more preferably 0.3 g / L.

[0021] The present invention also provides a preparation method of the liquid fertilizer, comprising the following steps: mixing inositol, L-tryptophan, Ca(NO3)2 and water.

[0022] In the present invention, the raw materials are added to water in sequence, and there is no special requirement for the addition order of the raw materials. However, when adding the raw materials, another raw material should be added after one raw material is completely dissolved.

[0023] The present invention also provides a usage method of the liquid fertilizer, spraying the liquid fertilizer after the full bloom of mangoes.

[0024] In the present invention, the spraying period is 8 - 12 days after the full bloom, preferably 9 - 11 days, and more preferably 10 days. The "after the full bloom" means that 90% of the flowers wither. The number of spraying times is 1 - 5 times, preferably 2 - 4 times, and more preferably 3 times. The interval days between two adjacent sprayings are 12 - 17 days, preferably 14 - 16 days, and more preferably 15 days. The spraying amount is 20 - 40 kg / mu·time, preferably 25 - 35 kg / mu·time, and more preferably 30 kg / mu·time. The spraying time is selected from 8:00 - 10:00 in the morning on sunny days or after the weather is slightly cooler in the afternoon, avoiding rainy days.

[0025] The present invention also provides the application of the liquid fertilizer in increasing the calcium content in the pulp of mango fruits.

[0026] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0027] Example 1

[0028] 4.5 g of inositol was added to 50 L of water and stirred until completely dissolved, then 50 g of L-tryptophan was added and stirred until completely dissolved, and then 15 g of Ca(NO3)2 was added and stirred until completely dissolved to obtain a liquid fertilizer capable of increasing the calcium content in the pulp of mango fruits.

[0029] Example 2

[0030] Add 25 g of L-tryptophan to 50 L of water and stir until completely dissolved. Then add 0.9 g of inositol and stir until completely dissolved. After that, add 5 g of Ca(NO3)2 and stir until completely dissolved to obtain a liquid fertilizer that can increase the calcium content in the pulp of mango fruits.

[0031] Example 3

[0032] Add 25 g of Ca(NO3)2 to 50 L of water and stir until completely dissolved. Then add 6.3 g of inositol and stir until completely dissolved. After that, add 75 g of L-tryptophan and stir until completely dissolved to obtain a liquid fertilizer that can increase the calcium content in the pulp of mango fruits.

[0033] Comparative Example 1

[0034] The difference from Example 2 is that L-tryptophan and inositol are not added.

[0035] Comparative Example 2

[0036] The difference from Example 1 is that L-tryptophan and inositol are not added.

[0037] Comparative Example 3

[0038] The difference from Example 3 is that L-tryptophan and inositol are not added.

[0039] Comparative Example 4

[0040] The difference from Example 2 is that Ca(NO3)2 and inositol are not added.

[0041] Comparative Example 5

[0042] The difference from Example 1 is that Ca(NO3)2 and inositol are not added.

[0043] Comparative Example 6

[0044] The difference from Example 3 is that Ca(NO3)2 and inositol are not added.

[0045] Comparative Example 7

[0046] The difference from Example 2 is that Ca(NO3)2 and L-tryptophan are not added.

[0047] Comparative Example 8

[0048] The difference from Example 1 is that Ca(NO3)2 and L-tryptophan are not added.

[0049] Comparative Example 9

[0050] The difference from Example 3 is that Ca(NO3)2 and L-tryptophan are not added.

[0051] Comparative Example 10

[0052] The difference from Example 1 is that inositol is not added.

[0053] Comparative Example 11

[0054] The difference from Example 1 is that L-tryptophan is not added.

[0055] Comparative Example 12

[0056] The difference from Example 1 is that Ca(NO3)2 is not added.

[0057] Effect Example

[0058] The South Subtropical Crops Research Institute of the Chinese Academy of Tropical Agricultural Sciences conducted field experiments on Keitt mangoes in 2022 and 2023. After the full bloom of mangoes, starting from the 10th day when 90% of the flowers withered, the liquid fertilizers prepared in Example 1 and Comparative Examples 1-12 were sprayed once every 15 days for 3 consecutive times. The standard for each spraying was until the leaves dripped water (about 30 kg / mu). At the same time, a control group was set up, and only clear water (about 30 kg / mu) was sprayed each time in the control group. The spraying time was selected from 8 to 10 am on sunny days or after the weather was slightly cooler in the afternoon, avoiding rainy days. When the fruits reached the commercial maturity stage (the pulp near the fruit core turned yellow), they were harvested. Mango fruits with the same treatment, maturity, and size, without pests, diseases, and mechanical damage, were selected. The peel and pulp were taken, dried at 70 °C, and pulverized, and then the calcium content in different tissues was measured. The results are shown in Table 1.

[0059] Table 1 Effects of different treatment groups on the calcium content in the pulp of mango fruits and the fruit rot rate

[0060]

[0061] As can be seen from Table 1, through two consecutive years of field experiments, after spraying the liquid fertilizer three times continuously after the full bloom, compared with spraying clear water (control), the calcium content in the pulp of Example 1 and Comparative Examples 1-12 was increased to varying degrees. Among them, the calcium content in the pulp of mango fruits in Example 1 increased the most, increasing by 84.1% and 82.2% respectively, and the fruit rot rate decreased from 13% to less than 3%. It shows that using the liquid fertilizer in the present invention can significantly increase the calcium content in the pulp of mango fruits, reduce the rot rate, and effectively guarantee the planting income of fruit farmers.

[0062] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A liquid fertilizer for increasing the calcium content of mango fruit pulp, characterized in that: Using water as solvent, the following components are included: inositol 100-700 μmol / L, L-tryptophan 0.5-1.5 g / L, Ca(NO3)2 0.1-0.5 g / L; The liquid fertilizer is sprayed after the mango is in full bloom.

2. Liquid fertilizer according to claim 1, characterized in that, Water is used as solvent, and the components with the following concentrations are included: inositol 300~600μmol / L, L-tryptophan 0.7~1.2g / L, and Ca(NO3)2 0.2~0.4g / L.

3. Liquid fertilizer according to claim 2, characterized in that, Water is used as solvent, and the following components are included in the preparation method: inositol 500 μmol / L, L-tryptophan 1.0 g / L, and Ca(NO3)2 0.3 g / L.

4. The method for preparing liquid fertilizer according to any one of claims 1 to 3, characterized in that: The following steps are involved: Mix inositol, L-tryptophan, Ca(NO3)2 and water.

5. The method for using the liquid fertilizer according to any one of claims 1 to 3 or the liquid fertilizer obtained by the preparation method according to claim 4, characterized in that: Spray this liquid fertilizer after the mango tree is in full bloom.

6. The method of use according to claim 5, characterized in that: The spraying period is 8 to 12 days after full bloom.

7. The method of use according to claim 5 or 6, characterized in that: After the full bloom, 90% of the flowers wither.

8. The method of use according to claim 5 or 6, characterized in that: The spraying times are 1 to 5 times, and the interval between two adjacent sprayings is 12 to 17 days.

9. The method of use according to claim 5 or 6, characterized in that: The spraying amount is 20-40 kg / mu / time.

10. Use of the liquid fertilizer according to any one of claims 1 to 3 or the liquid fertilizer obtained according to the preparation method according to claim 4 in increasing the calcium content of mango fruit pulp.

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