Formula, application method and application of novel organic foliar iron fertilizer

Abstract

The invention discloses a novel organic foliar iron fertilizer formula as well as an application method and application thereof. The formula of the novel organic foliar iron fertilizer comprises ferrous gluconate, D-glucolactone and vitamin c, wherein the mass ratio of the ferrous gluconate to the D-glucolactone to the vitamin c is 22.5: 20: 1. After a nonionic surfactant is added into the formula, and then the formula is added into water to be sprayed to plant leaves growing in alkaline soil, the chlorophyll content and the photosynthetic efficiency of the leaves can be remarkably improved, and the yield of crops, especially yellow peaches, can be improved. The foliar iron fertilizer is low in formula cost, simple in preparation process and obvious in effect in a short time, and has a wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of alkaline soil crop cultivation technology, specifically involving a novel organic foliar iron fertilizer formula and its application method and application. Background Technology

[0002] Iron, an essential nutrient for plant growth and development, participates in various physiological processes within plants, including photosynthesis, respiration, and redox reactions. Its effects are particularly pronounced in iron-deficient environments. Iron fertilizer is typically applied to the soil, where the interaction between soil, plants, and microorganisms leads to changes in plant physiology. Changes in root metabolism and rhizosphere exudates can alter the rhizosphere microbial community, and changes in plant growth rate can change nutrient requirements, thus affecting soil nutrient levels. All of these factors are closely linked to plant growth. However, iron fertilizer application is less effective in alkaline soils due to its low availability. Therefore, there is an urgent need to develop new iron fertilizers to enhance iron nutrition for plants in alkaline soils and promote plant growth.

[0003] This invention provides a formula and application method that is low in cost, simple in manufacturing process, and can increase the chlorophyll content and photosynthetic efficiency of leaves in a short time, thereby increasing the yield of crops, especially yellow peaches. Summary of the Invention

[0004] In view of this, one of the objectives of the present invention is to provide a novel organic foliar iron fertilizer formulation, comprising ferrous gluconate, D-gluconolactone, and vitamin C, wherein the mass ratio of ferrous gluconate, D-gluconolactone, and vitamin C is 22.5:20:1.

[0005] The second objective of this invention is to provide a novel organic foliar iron fertilizer, which is prepared by the following method: ferrous gluconate, D-gluconolactone, vitamin C, and nonionic surfactant are added to water and mixed evenly. The ratio of ferrous gluconate, D-gluconolactone, vitamin C, nonionic surfactant, and water is 22.5 g: 20 g: 1 g: 2.5 mL: 10 L.

[0006] Furthermore, the nonionic surfactant is the commercially available Jiexiaoli pesticide tank mixing adjuvant, which is in liquid form and produced by Momentive Advanced Materials (Nantong) Co., Ltd.

[0007] A third objective of this invention is to provide the application of the aforementioned formulation in promoting the chlorophyll content and / or photosynthetic efficiency of plant leaves.

[0008] Furthermore, the plant is Sichuan pepper, navel orange, or yellow peach.

[0009] Furthermore, the plant grows in alkaline soil.

[0010] The fourth objective of this invention is to provide the application of the aforementioned formula in promoting the yield of yellow peaches grown in alkaline soil.

[0011] Furthermore, the output refers to quantity and / or weight.

[0012] The fifth objective of this invention is to provide a method for applying the iron fertilizer, wherein the iron fertilizer is sprayed onto the upper and lower surfaces of plant leaves.

[0013] Furthermore, the spraying frequency is once a week, for a total of two or three times.

[0014] Furthermore, the first spraying begins in mid-April each year.

[0015] This invention relates to a novel organic foliar iron fertilizer. Ferrous gluconate, D-gluconolactone, vitamin C, a nonionic surfactant, and water are combined in a ratio of 22.5 g:20 g:1 g:2.5 mL:10 L, and mixed thoroughly. When sprayed on the leaves of plants growing in alkaline soil, it can rapidly increase chlorophyll content and photosynthetic efficiency, thereby increasing crop yields, especially for yellow peaches. Furthermore, it boasts advantages such as low formulation cost, simple manufacturing process, significant effects in a short time, convenient application, fewer application times, and a short cycle. Attached Figure Description

[0016] Figure 1 The effect of foliar iron fertilizer on the chlorophyll content of Sichuan pepper leaves;

[0017] Figure 2 The effect of foliar iron fertilizer application on the photosynthetic efficiency of Sichuan pepper leaves;

[0018] Figure 3 The effect of foliar iron fertilizer on chlorophyll content in yellow peach leaves;

[0019] Figure 4 The effect of foliar iron fertilizer application on the photosynthetic efficiency of yellow peach leaves;

[0020] Figure 5 The effect of foliar iron fertilizer application on chlorophyll content in navel orange leaves;

[0021] Figure 6 The effect of foliar iron fertilizer application on the photosynthetic efficiency of navel orange leaves. Detailed Implementation

[0022] The present invention will be described in detail below with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of application of the present invention. The present invention is not limited to the following embodiments or examples. Any modifications and variations made without departing from the spirit of the present invention should be included within the scope of the present invention. Unless otherwise specified, the experimental materials or reagents used in the following embodiments are commercially available.

[0023] Material sources and preparation of novel organic foliar iron fertilizer

[0024] Ferrous gluconate: purchased from Ron Chemical Reagents website, 98% reagent grade.

[0025] D-Gluconolactone: Purchased from Shanghai Shifeng Biotechnology Co., Ltd., CAS: 90-80-2, content ≥99.0%, heavy metals ≤0.002%, molecular weight 178.14.

[0026] Vitamin C: Purchased from Xi'an Tianmao Baoding Biotechnology Co., Ltd., product name is ascorbic acid, CAS NO:62624-30-0, Fe≤0.0002, heavy metals≤0.001, molecular weight is 176.13.

[0027] Nonionic surfactant: Commercially available Jiexiaoli pesticide tank mixing adjuvant, the product is in liquid form and is produced by Momentive Advanced Materials (Nantong) Co., Ltd.

[0028] A novel organic foliar iron fertilizer formula consists of ferrous gluconate, D-gluconolactone, and vitamin C in a mass ratio of 22.5:20:1.

[0029] Preparation of a novel organic foliar iron fertilizer: Ferrous gluconate, D-gluconolactone, vitamin C, and nonionic surfactant were added to water and mixed evenly. The ratio of ferrous gluconate, D-gluconolactone, vitamin C, nonionic surfactant, and water was 22.5 g:20 g:1 g:2.5 mL:10 L.

[0030] Example 1: Field Experiment 1

[0031] 1.1 Method

[0032] The Sichuan pepper base of Yuli Agricultural Co., Ltd., located in Taihe Town, Hechuan District, Chongqing, has coordinates of 106.051219, 30.0948651. It covers an area of ​​1000 mu (approximately 67 hectares), with the pepper planted primarily on newly reclaimed sloping land. The processing plant covers nearly 5000 square meters. (The soil pH is 8.1-8.38).

[0033] This experiment was conducted from April to July 2025. The test crop was Sichuan pepper (Zanthoxylum bungeanum Maxim.), cultivar 9-leaf Sichuan pepper. Forty-five Sichuan pepper trees of uniform growth were selected and nine treatments were set up, one of which was a control group. The other eight treatment groups were sprayed with different foliar iron fertilizers. Each treatment group contained five Sichuan pepper trees. The control group (CK) received no foliar iron fertilizer. The eight treatment groups, each sprayed with a different foliar iron fertilizer, were as follows: Treatment group 2: 28.5 g ferrous sulfate, 5 mL nonionic surfactant; Treatment group 3: 45 g ferrous gluconate, 5 mL nonionic surfactant; Treatment group 4: 28.5 g ferrous sulfate, 2 g vitamin C, 5 mL nonionic surfactant; Treatment group 5: 45 g ferrous gluconate, 2 g vitamin C, 5 mL nonionic surfactant; Treatment group 6: 14.25 g ferrous sulfate, 22.5 g ferrous gluconate, 2 g vitamin C, 5 mL nonionic surfactant; Treatment group 7: 28.5 g ferrous sulfate, 40 g D-gluconolactone, 2 g vitamin C, 5 mL nonionic surfactant; Treatment group 8: 45 g ferrous gluconate, 40 g D-gluconolactone, 2 g vitamin C, 5 mL nonionic surfactant; Treatment group 9: 14.25 g ferrous sulfate, 22.5 g ferrous gluconate... g, D-gluconolactone 40 g, vitamin C 2 g, nonionic surfactant 5 mL.

[0034] Instructions for use: Combine the ingredients from each treatment group and add them to 20 L of water, stirring well. Spray each mixture evenly onto the leaves of 5 Sichuan pepper plants in each treatment, covering both the top and bottom surfaces of the leaves, ensuring full coverage. Spray once a week for a total of 3 times.

[0035] Before each spraying, pepper leaves were taken back to the laboratory to measure the chlorophyll content and photosynthetic efficiency. After the last spraying, a week was waited before pepper leaves were taken again to measure the chlorophyll content and photosynthetic efficiency and to calculate the yield.

[0036] Method for determining leaf chlorophyll content: Use a SPAD instrument. Place the leaf in the measuring clip of the SPAD instrument, ensuring complete coverage of the aperture. Gently close the clip, avoiding excessive force that could damage the leaf. Record data from 10 points for each measurement, and take the average to represent the SPAD value of that leaf.

[0037] Leaf photosynthetic efficiency measurement method: A portable photosynthesis meter is used. Select healthy, undamaged leaves, avoiding the midrib and leaf margins, and ensure the measurement sites are as consistent as possible. Place the leaf in the leaf chamber, ensuring a good seal, and wait for the data to stabilize. Record parameters such as net photosynthetic efficiency. Measure each leaf three times and take the average. Perform the measurement in sunny, windless, or lightly windy weather if possible.

[0038] Method for calculating the weight of 1000 Sichuan peppercorns: Dry fresh Sichuan peppercorns in a 105℃ oven for 1-2 hours to ensure they are fully dried to a constant weight. Then, cool them to room temperature in a desiccator and select healthy, intact peppercorns for testing. From the batch of peppercorns to be tested, use a random multi-point sampling method: take samples from five different locations (top, middle, bottom, left, and right) of the peppercorn pile, with each sample weighing at least 50 g. Mix all samples thoroughly and further reduce the weight using the "quartering method": spread the mixed sample into a uniform thin layer, divide it into four parts along the diagonal, discard the two diagonal parts, and continue mixing and reducing the remaining two parts until a representative sample of approximately 35-40 g is obtained. From the reduced sample, count 1000 intact, undamaged, and impurity-free peppercorns using a grain counter. Weigh the peppercorns using an electronic balance with an accuracy of at least 0.01 g; the balance must be calibrated before weighing. Manually separate the peppercorn shells from the seeds. Manually count 1000 peppercorn shells and weigh them. Use a seed counter to automatically count 1000 peppercorn seeds and weigh them.

[0039] Note: The final result of each of the above tests and calculations is the average of the results of three parallel replicates in each treatment group.

[0040] 1.2 Results

[0041] 1.2.1 Effect on leaf chlorophyll content

[0042] The chlorophyll content of leaves in each treatment after foliar iron fertilizer application is as follows: Figure 1 As shown, all foliar iron fertilizer treatments increased the chlorophyll content of leaves. Treatments 1-9 increased it by 2.4%, 24.64%, 28.56%, 36.56%, 36.16%, 36.2%, 37.36%, 46.68%, and 37.64%, respectively. Among them, treatment group 8 had the highest chlorophyll content, which increased significantly by 46.68%. The treatment containing ferrous sulfate also showed an increase, but the increase was not as great as that of the treatment containing ferrous gluconate.

[0043] 1.2.2 Effects on leaf photosynthetic efficiency

[0044] Depend on Figure 2It can be seen that the photosynthetic efficiency of leaves in treatment 1 decreased by 3.33%. Foliar application of iron fertilizer in all treatments improved the photosynthetic efficiency of leaves, with treatments 2-9 increasing it by 59.28%, 93.52%, 86.47%, 106.15%, 77.83%, 75.61%, 108%, and 77.55%, respectively. Treatment group 8 showed the largest increase after the third application, with a significant increase of 108%. Figure 2 The study also showed that while the ferrous sulfate treatment improved the photosynthetic efficiency of the leaves, the improvement was relatively smaller compared to the ferrous gluconate treatment. Therefore, ferrous gluconate is a better and more reliable choice.

[0045] 1.2.3 Effect on the thousand-grain weight of Sichuan pepper

[0046] As shown in Table 1, some treatments increased the thousand-grain weight after foliar application of iron fertilizer. Sichuan pepper seeds consist of both the husk and the kernel. Since Sichuan pepper is an economic crop, the thousand-grain weight of the husk is the key factor. Treatments 2, 3, 4, and 9 showed reductions of 1.51797 g, 0.55304 g, 0.00214 g, and 1.32484 g compared to the control (CK), respectively. Treatments 5, 6, 7, and 8 showed increases of 0.13683 g, 1.14626 g, 0.55086 g, and 1.27106 g compared to the CK, respectively. Treatment 8 showed the largest increase in weight. In terms of the overall weight of peppercorns, treatment groups 2, 3, 4 and 9 reduced the weight by 2.16464 g, 1.47971 g, 0.39214 g and 1.81818 g respectively compared with the control group. Treatment groups 5, 6, 7 and 8 increased the weight by 0.16349 g, 1.31292 g, 0.20086 g and 0.80772 g respectively compared with the control group. Treatment group 6 showed the largest increase in weight.

[0047] Table 1. Weight of 1000 peppercorns (g)

[0048] deal with 1 2 3 4 5 6 7 8 9 1000-grain weight (shell / g) 18.73177 17.2138 18.17873 18.72963 18.8686 19.87803 19.28263 20.00283 17.40693 1000-grain weight (seeds / g) 10.73667 10.09 9.81 10.34667 10.76333 10.90333 10.38667 10.27333 10.24333 1000-grain weight (grains / g) 29.46844 27.3038 27.98873 29.0763 29.63193 30.78136 29.6693 30.27616 27.65026

[0049] Therefore, after spraying foliar iron fertilizer on pepper leaves under alkaline soil conditions, although the chlorophyll content and photosynthetic efficiency of pepper leaves were significantly increased, the weight of pepper fruits in the eight treatment groups was not significantly different from that in the control group, and the weight of pepper fruits in half of the treatment groups showed a decreasing trend.

[0050] Example 2 Field Trial II

[0051] 2.1 Method

[0052] Located in Dacangshan, Tangba Town, Tongnan District, Chongqing, the Tongnan Orchard, situated at 30° North latitude, is an agricultural tourism enterprise mainly engaged in planting and breeding, covering an area of ​​over 200 mu (soil pH 8.09-8.67).

[0053] This experiment was conducted from April to July 2025. The test crop was yellow peach (scientific name: Prunus persica 'Yellow Peaches'), variety Jintong 7. Eighteen yellow peach trees of uniform growth were selected and nine treatments were set up, one of which was a control group. The other eight treatment groups were sprayed with different foliar iron fertilizers. Each treatment group contained two yellow peach trees. The control group (CK) received no foliar iron fertilizer. The eight treatment groups, each sprayed with a different foliar iron fertilizer, were as follows: Treatment group 2: 14.25 g ferrous sulfate, 2.5 mL nonionic surfactant; Treatment group 3: 22.5 g ferrous gluconate, 2.5 mL nonionic surfactant; Treatment group 4: 14.25 g ferrous sulfate, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 5: 22.5 g ferrous gluconate, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 6: 7.125 g ferrous sulfate, 11.25 g ferrous gluconate, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 7: 14.25 g ferrous sulfate, 20 g D-gluconolactone, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 8: 22.5 g ferrous gluconate, 20 g D-gluconolactone, 1 g vitamin C, 2.5 mL nonionic surfactant. Treatment group 9: 7.125 g ferrous sulfate, 11.25 g ferrous gluconate, 20 g D-gluconolactone, 1 g vitamin C, and 2.5 mL nonionic surfactant. The components of each treatment group were combined and poured into 10 L of water, stirred thoroughly, and the yellow peach tree leaves were sprayed as in Example 1.

[0054] Method for determining the total yield of yellow peaches: Total yield of yellow peaches = average weight per fruit × total number of yellow peaches.

[0055] Total number of yellow peaches: Count the number of fruits on each fruiting branch of the entire tree.

[0056] Average weight per fruit: Fruits are randomly selected from the upper, middle, and lower layers of the tree canopy, as well as the inner and outer canopies. 30 fruits are sampled from each tree, following a "random principle" during sampling, without intentionally selecting large or small fruits. An electronic balance with an accuracy of at least 0.1 g is used, and the balance must be calibrated before weighing.

[0057] The methods for determining leaf chlorophyll content and leaf photosynthetic efficiency are the same as in Example 1.

[0058] 2.2 Results

[0059] 2.2.1 Effect on leaf chlorophyll content

[0060] The chlorophyll content of leaves in each treatment after foliar iron fertilizer application is as follows: Figure 3 As shown, all foliar iron fertilizer treatments increased leaf chlorophyll content, with treatments 1-9 increasing it by 19.4%, 115.1%, 131.3%, 134.4%, 127%, 172.9%, 146.7%, 193.8%, and 134.9%, respectively. Treatment group 8 showed the highest chlorophyll content, with a significant increase of 193.8%. Treatments containing ferrous sulfate also showed an increase, but the magnitude was smaller than those containing ferrous gluconate. Ferrous gluconate, however, effectively maintained a high chlorophyll content in the leaves, ensuring continued healthy plant growth.

[0061] 2.2.2 Effect on leaf photosynthetic efficiency

[0062] Depend on Figure 4 It can be seen that the photosynthetic efficiency of leaves in treatment 1 decreased by 7.4%. Foliar application of iron fertilizer in all treatments improved the photosynthetic efficiency of leaves. Treatments 2-9 increased it by 67.1%, 74.3%, 67.13%, 91.83%, 82.73%, 80.87%, 127.6%, and 84.82%, respectively. Treatment group 8 showed the largest increase, a significant improvement of 127.6%. Figure 4 The study also showed that while the ferrous sulfate treatment improved the photosynthetic efficiency of the leaves, the improvement was relatively smaller compared to the ferrous gluconate treatment. Therefore, ferrous gluconate is a better and more reliable choice.

[0063] 2.2.3 Effects on the yield of yellow peaches

[0064] As shown in Table 2, foliar application of iron fertilizer increased the total number of yellow peaches. Treatments 2, 3, 4, 5, 6, 7, 8, and 9 increased the number of peaches by 8, 14, 2, 25, 12, 10, 42, and 22 respectively compared to the control (CK). Among them, treatment 8 showed a significantly higher increase in the total number of peaches than the other treatment groups.

[0065] Table 2: Quantity of Yellow Peaches (in pieces)

[0066] deal with 1 2 3 4 5 6 7 8 9 Total number of fruits (pieces) 80 88 94 82 105 92 90 122 102

[0067] As shown in Table 3, foliar application of iron fertilizer increased the average weight of yellow peaches. Treatments 2, 3, 4, 5, 6, 7, 8, and 9 increased the weight by 58.21 g, 99.7 g, 118.87 g, 166.2 g, 118.05 g, 67.05 g, 182.33 g, and 65.72 g compared to the control (CK), respectively. Among these, treatment 8 showed a significantly higher average weight increase than the other treatment groups.

[0068] Table 3. Average weight of yellow peach fruit (g)

[0069] deal with 1 2 3 4 5 6 7 8 9 Weight (g) 121.56 179.77 221.26 240.43 287.76 239.61 188.61 303.89 187.28

[0070] As shown in Table 4, foliar application of iron fertilizer increased the total yield of yellow peaches. Treatments 2, 3, 4, 5, 6, 7, 8, and 9 increased the yield by 6094.96 g, 11073.64 g, 9990.46 g, 20490 g, 12319.32 g, 7250.1 g, 27349.78 g, and 9377.76 g compared to the control (CK), respectively. Among these, treatment 8 showed a significantly higher increase in total yield than the other treatment groups.

[0071] Table 4 Total Yield of Yellow Peaches (g)

[0072] deal with 1 2 3 4 5 6 7 8 9 Total output (g) 9724.8 15819.76 20798.44 19715.26 30214.8 22044.12 16974.9 37074.58 19102.56

[0073] Note: Total production = average weight per unit × total quantity

[0074] Therefore, after spraying yellow peach leaves with foliar iron fertilizer under alkaline soil conditions, the chlorophyll content and photosynthetic efficiency of yellow peach leaves were significantly increased, and the number and weight of yellow peach fruits were significantly higher than those of the control group and other treatment groups.

[0075] From an economic cost perspective: Based on the results of Examples 1 and 2, Treatment 8 showed the best overall effect. The results of leaf chlorophyll content and photosynthetic efficiency also indicate that the difference between the second and third applications was not significant. Therefore, from an economic cost perspective, among all the new organic foliar iron fertilizer treatments, Treatment 8 only needs to be sprayed twice, once a week.

[0076] Example 3 Field Trial Three

[0077] 3.1 Method

[0078] Located in Dacangshan, Tangba Town, Tongnan District, Chongqing, the Tongnan Orchard, situated at 30° North latitude, is an agricultural tourism enterprise mainly engaged in planting and breeding, covering an area of ​​over 200 acres (soil pH 8.09-8.67).

[0079] This experiment was conducted from April to July 2025. The test crop was navel orange (scientific name: Citrus sinensis Osb. var. Brasliliensis Tanaka), cultivar Newhall navel orange. Eighteen navel orange trees of uniform growth were selected and nine treatments were set up, one of which was a control group, and the other eight treatment groups were sprayed with different foliar iron fertilizers. Each treatment included two navel orange trees. The control group (CK) received no foliar iron fertilizer. The eight treatment groups, each sprayed with a different foliar iron fertilizer, were as follows: Treatment group 2: 14.25 g ferrous sulfate, 2.5 mL nonionic surfactant; Treatment group 3: 22.5 g ferrous gluconate, 2.5 mL nonionic surfactant; Treatment group 4: 14.25 g ferrous sulfate, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 5: 22.5 g ferrous gluconate, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 6: 7.125 g ferrous sulfate, 11.25 g ferrous gluconate, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 7: 14.25 g ferrous sulfate, 20 g D-gluconolactone, 1 g vitamin C, 2.5 mL nonionic surfactant; Treatment group 8: 22.5 g ferrous gluconate, 20 g D-gluconolactone, 1 g vitamin C, 2.5 mL nonionic surfactant. Treatment group 9: 7.125 g ferrous sulfate, 11.25 g ferrous gluconate, 20 g D-gluconolactone, 1 g vitamin C, and 2.5 mL nonionic surfactant. The components of each treatment group were combined and poured into 10 L of water, stirred thoroughly, and the navel orange leaves were sprayed with the same solution as in Example 1.

[0080] Method for determining the total yield of navel oranges: Total yield of navel oranges = average weight per orange × total number of navel oranges.

[0081] Total number of navel oranges: Count the number of fruits on each fruiting branch of the entire tree.

[0082] Average weight per fruit: Fruits are randomly selected from the upper, middle, and lower layers of the tree canopy, as well as the inner and outer canopies. 30 fruits are sampled from each tree, following a "random principle" during sampling, without intentionally selecting large or small fruits. An electronic balance with an accuracy of at least 0.1 g is used, and the balance must be calibrated before weighing.

[0083] The methods for determining leaf chlorophyll content and leaf photosynthetic efficiency are the same as in Example 1.

[0084] 3.2 Results

[0085] 2.2.1 Effect on leaf chlorophyll content

[0086] The chlorophyll content of leaves in each treatment after foliar iron fertilizer application is as follows: Figure 5 As shown, all foliar iron fertilizer treatments increased the chlorophyll content of leaves. Treatments 1-9 increased it by 2.3%, 17%, 10.7%, 14.6%, 14.6%, 27.8%, 10.6%, 9.8%, and 16.1%, respectively. Under the same soil and environment, the difference in the improvement effect among the treatment groups was not significant. Moreover, the effect of foliar iron fertilizer on the chlorophyll content of navel orange leaves was not as obvious as that on yellow peach leaves.

[0087] 2.2.2 Effect on leaf photosynthetic efficiency

[0088] Depend on Figure 6 It can be seen that the photosynthetic efficiency of leaves in treatment 1 decreased by 3%. Foliar application of iron fertilizer in all treatments improved the photosynthetic efficiency of leaves. Treatments 2-9 improved by 13.9%, 16.6%, 17.4%, 16.9%, 16.8%, 17.1%, 15.5%, and 16.6%, respectively. Although foliar application of iron fertilizer increased the photosynthetic efficiency of leaves, the improvement effect among the treatment groups was not significant under the same soil and environment, and the improvement effect on navel oranges was not as good as that on yellow peaches.

[0089] 2.2.3 Impact on navel orange fruit yield

[0090] As shown in Table 5, when different foliar iron fertilizers were sprayed, treatments 3, 5, 6, 8, and 9 increased the number of fruits by 2, 5, 1, 1, and 3 respectively compared to the control group, while treatments 2, 4, and 7 decreased the number of fruits by 4, 3, and 1 respectively compared to the control group. There was no significant difference in the number of fruits among the treatment groups compared to the control group.

[0091] Table 5. Number of Navel Oranges (pieces)

[0092] deal with 1 2 3 4 5 6 7 8 9 Total number of fruits (pieces) 47 43 49 44 52 48 46 48 50

[0093] As shown in Table 6, spraying different foliar iron fertilizers increased fruit weight by 15.21g, 7.87g, 10.05g, 13.05g, and 7.33g compared to the control (CK) in treatments 2, 4, 6, 7, and 8, respectively, while decreasing it by 10.8g, 15.3g, and 7.28g compared to the CK in treatments 3, 5, and 9, respectively. There was no significant difference in average fruit weight between the treatment groups and the control group.

[0094] Table 6. Average weight of navel orange fruit (g)

[0095] deal with 1 2 3 4 5 6 7 8 9 Weight (g) 205.56 220.77 194.76 213.43 190.26 215.61 218.61 212.89 198.28

[0096] As shown in Table 7, spraying different foliar iron fertilizers resulted in increases in fruit weight of treatments 5, 6, 7, 8, and 9 compared to the control (CK) of 232.2 g, 687.96 g, 394.74 g, 557.4 g, and 252.68 g, respectively. Treatments 2, 3, and 4 resulted in decreases in fruit weight compared to the control group of 168.21 g, 118.08 g, and 270.4 g, respectively. There was no significant difference in total fruit weight between the treatment groups and the control group.

[0097] Table 7 Total yield of navel oranges (g)

[0098] deal with 1 2 3 4 5 6 7 8 9 Total output (g) 9661.32 9493.11 9543.24 9390.92 9893.52 10349.28 10056.06 10218.72 9914

[0099] Note: Total production = average weight per unit × total quantity

[0100] Therefore, after spraying foliar iron fertilizer on navel orange leaves under alkaline soil conditions, although the chlorophyll content and photosynthetic efficiency of navel orange leaves were increased, the increase was small and lower than that of Sichuan pepper and yellow peach. Furthermore, the total yield of navel orange fruits in the eight treatment groups, including the number and weight, was not significantly different from that of the control group.

[0101] In summary, under alkaline soil conditions, foliar iron fertilizers formulated with different components all improved the chlorophyll content and photosynthetic efficiency of leaves in Sichuan pepper, navel orange, and yellow peach. However, the improvement effect on navel orange leaves was lower than that on Sichuan pepper and yellow peach leaves. The novel organic foliar iron fertilizer formulated with ferrous gluconate, D-gluconolactone, vitamin C, and nonionic surfactants showed a more significant improvement in Sichuan pepper and yellow peach leaves compared to other treatments. In applications to increase fruit yield, the iron fertilizer prepared with the novel organic foliar iron fertilizer formulation of this invention did not significantly increase the yield of Sichuan pepper and navel orange fruits, but it had a significant effect on increasing the yield, including the number and / or weight, of yellow peach fruits.

[0102] The conventional techniques and solutions not described in detail in the above embodiments are all well known in the art, and therefore will not be elaborated upon here. The above embodiments and / or experimental examples describe the preferred embodiments of the present invention in detail. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A novel organic foliar iron fertilizer formula, characterized in that, It includes ferrous gluconate, D-gluconolactone, and vitamin C, wherein the mass ratio of ferrous gluconate, D-gluconolactone, and vitamin C is 22.5:20:

1.

2. A novel organic foliar iron fertilizer, characterized in that, The product is prepared by the following method: ferrous gluconate, D-gluconolactone, vitamin C and nonionic surfactant are added to water and mixed and stirred until homogeneous. The ratio of ferrous gluconate, D-gluconolactone, vitamin C, nonionic surfactant and water is 22.5 g:20 g:1 g:2.5 mL:10 L.

3. The application of the formulation according to claim 1 in promoting the chlorophyll content and / or photosynthetic efficiency of plant leaves.

4. The application as described in claim 3, characterized in that, The plant in question is Sichuan pepper, navel orange, or yellow peach.

5. The application as described in claim 3, characterized in that, The plant grows in alkaline soil.

6. The application of the formula according to claim 1 in promoting the yield of yellow peaches, characterized in that, The yellow peaches are grown in alkaline soil.

7. The application as described in claim 6, characterized in that, The output refers to quantity and / or weight.

8. The method for applying iron fertilizer according to claim 2, characterized in that, Spray the plant leaves with the iron fertilizer.

9. The application method as described in claim 8, characterized in that, The spraying frequency is once a week, for a total of two or three times.

10. The application method as described in claim 9, characterized in that, The first spraying begins in mid-April each year.

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