Low-protein rice cultivation method

Abstract

To provide a method for cultivating low-protein rice. [Solution] The method for cultivating low-protein rice provided by the present invention comprises the following steps: a land preparation step, in which a first fertilizer composition is applied to cultivated land; a rice planting step, in which young rice seedlings are planted in the cultivated land; a first cultivation step, in which the young rice seedlings are cultivated in the cultivated land for a first cultivation period and fertilized with a second fertilizer composition to obtain mature rice plants; a second cultivation step, in which the mature rice seedlings are cultivated in the cultivated land for a second cultivation period and fertilized with a third fertilizer composition; and a harvesting step, in which a plurality of low-protein rice plants are obtained. Low-protein rice cultivated by the low-protein rice cultivation method of the present invention can provide patients with chronic kidney disease with a healthier dietary option and has good market potential.

Description

[Technical Field]

[0001] The present invention relates to a method for cultivating rice, and more particularly to a method for cultivating low-protein rice. [Background technology]

[0002] In patients with chronic kidney disease, the kidneys are unable to effectively excrete nitrogenous waste products produced after protein metabolism, which can accumulate in the blood and poison the body. Appropriate protein intake restriction can slow the deterioration of kidney function.

[0003] To reduce the harm caused by nitrogenous waste products, many physicians and other experts recommend that patients with chronic kidney disease limit their dietary protein intake and supplement the missing calories with other foods. Rice is a staple food for Asians, but the protein in cooked rice is not highly bioavailable. Therefore, when protein intake is restricted, patients with chronic kidney disease should primarily choose high-quality protein sources, such as chicken, fish, and soy products, to increase protein absorption. Low-protein starches (such as rice vermicelli, glass noodles, and rice noodles) can also be used as a partial replacement for staple foods, avoiding excessive protein intake while maintaining calorie balance. Therefore, excessive protein intake from cooked rice can actually be disruptive to the dietary management of patients with chronic kidney disease.

[0004] To address these issues, manufacturers currently use additional processing methods, such as drying and steaming, on commercially available rice to break down the proteins, or to ferment the rice using microorganisms, resulting in cooked rice with a low protein content. However, processing rice using methods such as drying and steaming not only destroys other nutritional components in the rice, but also complicates the processing and raises the risk of the proliferation of other bacteria during the heat treatment process, making it less than ideal from nutritional and hygienic perspectives. Furthermore, reducing the protein content of rice through microbial fermentation also has the potential to alter the composition of other nutrients, and there is also concern that the microorganisms themselves and their secondary metabolites may cause gastrointestinal discomfort or allergic reactions. Therefore, the above-mentioned methods of reducing the protein content of rice through additional processing have many limitations on their industrial application. Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, making it possible to cultivate rice with a low protein content and meet market needs is an economically valuable technological challenge. [Means for solving the problem]

[0006] A method for cultivating low-protein rice according to one embodiment of the present invention includes the following steps:

[0007] A process for preparing land, comprising applying a first fertilizer composition to cultivated land, the first fertilizer composition comprising phosphorus, nitrogen, and potassium, and based on 1 weight percent phosphorus, 2.5 to 4.5 weight percent nitrogen, and 0.7 to 3 weight percent potassium.

[0008] This is the process of planting rice, in which young rice plants are planted in cultivated land.

[0009] The first cultivation step involves cultivating young rice plants in cultivated land for 15 to 30 days and applying a second fertilizer composition to obtain mature rice plants, wherein the second fertilizer composition is applied at least once in the first cultivation step, and the second fertilizer composition contains magnesium, manganese, iron, boron, zinc, and copper, and is based on 1 weight percent copper, 6 to 18 weight percent magnesium, 2 to 6 weight percent manganese, 1.5 to 6 weight percent iron, 1 to 3 weight percent boron, and 2 to 5 weight percent zinc.

[0010] a second cultivation step, in which growing rice plants are cultivated in cultivated land for 15 to 35 days and fertilized with a third fertilizer composition to bring the growing rice plants into a reproductive stage, and the third fertilizer composition is applied at least once in the second cultivation step, and the third fertilizer composition contains magnesium, manganese, iron, boron, zinc, copper, phosphoric acid, nitrogen, and potassium, and is based on 1 weight percent copper, 6 to 18 weight percent magnesium, 2 to 6 weight percent manganese, 1.5 to 6 weight percent iron, 1 to 3 weight percent boron, and 2 to 5 weight percent zinc, and the weight percent of phosphoric acid in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of phosphoric acid in the first fertilizer composition, the weight percent of nitrogen in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of nitrogen in the first fertilizer composition, and the weight percent of potassium in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of potassium in the first fertilizer composition.

[0011] A harvesting step includes harvesting the growing paddy rice plants to obtain a plurality of low protein rice plants, wherein the low protein rice plants have a protein content of less than 6 grams of protein per 100 grams of low protein rice.

[0012] According to the aforementioned low-protein rice cultivation method, the organic content of cultivated land can be 0.5 to 3.5%.

[0013] According to the above-mentioned method for cultivating low-protein rice, the pH value of cultivated land can be 5.5 to 7.5.

[0014] According to the above-mentioned method for cultivating low-protein rice, the young rice plants may be first-crop rice or second-crop rice.

[0015] According to the above-mentioned method for cultivating low-protein rice, when the young rice plants are the first crop of rice, the young rice plants can be cultivated in cultivated land for 20 to 30 days in the first cultivation step.

[0016] According to the above-mentioned method for cultivating low-protein rice, when the young rice plants are first-crop rice plants, the mature rice plants can be cultivated in cultivated land for 15 to 25 days in the second cultivation step.

[0017] According to the above-mentioned method for cultivating low-protein rice, when the young rice plants are second-crop rice plants, the young rice plants can be cultivated in cultivated land for 15 to 25 days in the first cultivation step.

[0018] According to the above-mentioned method for cultivating low-protein rice, when the young rice plants are second-crop rice plants, the mature rice plants can be cultivated in cultivated land for 15 to 25 days in the second cultivation step.

[0019] According to the above-mentioned method for cultivating low-protein rice, the second fertilizer composition can be applied to young rice plants by foliar application.

[0020] According to the above-mentioned method for cultivating low-protein rice, the third fertilizer composition can be applied to growing paddy rice plants by foliar spraying. [Effects of the Invention]

[0021] The method for cultivating low-protein rice of the present invention is a three-stage cultivation method with differentiated nutrition, in which a first fertilizer composition having a specific blending ratio of phosphorus, nitrogen, and potassium is first applied to cultivated land before the rice planting process, and then a second fertilizer composition and a third fertilizer composition are applied sequentially after the young rice seedlings are planted in the cultivated land. This method not only promotes the healthy growth of the young rice seedlings, but also ensures that the low-protein rice obtained by cultivation has a low protein content. Furthermore, it can be used in the dietary management plans of patients with chronic kidney disease, and has great potential for market application.

[0022] Furthermore, in another embodiment of the present invention, a low-protein food product is provided, which is used for consumption by groups that require control of the protein content in their diet and contains low-protein rice obtained by the above-mentioned cultivation method or a processed product thereof. [Brief explanation of the drawings]

[0023] To make the above and other objects, features, advantages and embodiments of the present invention more clear, reference is made to the following drawings.

[0024] [Figure 1] 1 is a flowchart showing the steps of the method for cultivating low-protein rice of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] In the following, specific experimental examples of the present invention will be described in detail with reference to the drawings, so that those skilled in the art can fully utilize and practice the present invention without undue analysis or experimentation. However, the details of these practical examples should not be used to limit the present invention. That is, in some experimental examples of the present invention, the details of these practical examples are not essential, but are used as materials and methods to explain how to implement the present invention.

[0026] [Method for cultivating low-protein rice of the present invention]

[0027] Please refer to Figure 1, which is a flow chart showing the steps of the present invention's low protein rice cultivation method 100. The low protein rice cultivation method 100 includes steps 110, 120, 130, 140, and 150.

[0028] Step 110 is a step of preparing the land and applying a first fertilizer composition to the cultivated land. Specifically, before planting rice, the cultivated land is turned over and dried after the harvest of the previous crop to promote soil weathering, decomposition of organic matter, and release of toxic substances. Irrigation water is then introduced into the cultivated land and retained for 2 to 4 days. Three days before rice planting, the first fertilizer composition is applied to the cultivated soil to promote subsequent cultivation.

[0029] In the method 100 for cultivating low-protein rice of the present invention, a first fertilizer composition is applied to cultivated soil as a basal fertilizer, and the first fertilizer composition contains phosphorus, nitrogen, and potassium, of which phosphorus is 1 weight percent, nitrogen is 2.5 to 4.5 weight percent, and potassium is 0.7 to 3 weight percent. Furthermore, the organic content of the cultivated soil can be 0.5 to 3.5%, and the pH value of the cultivated soil can be 5.5 to 7.5. This provides an excellent growth environment for young rice plants, but the present invention is not limited thereto.

[0030] Step 120 is a rice planting step in which young rice plants are planted in cultivated land. The young rice plants can be commercially available or various varieties of rice that are currently being cultivated. In the rice planting step, the young rice plants are planted in cultivated land with a water depth of about 3 cm, which allows the young rice plants to take root and encourages the lateral buds at the base nodes near the ground to grow and branch, causing the young rice plants to enter the tillering stage.

[0031] Furthermore, the young rice plants may be first-crop rice or second-crop rice. More specifically, current rice cultivation can be double-cropping. This refers to a method of planting crops twice a year in the same cultivated land, with first-crop rice being cultivated from February to June and second-crop rice being cultivated from July to October. When the young rice plants are first-crop rice, they may be young plants 18 to 20 days after sowing of rice grains and with a seedling age of 2.5 to 3.0 leaves. When the young rice plants are second-crop rice, they may be young plants 10 to 12 days after sowing of rice grains and with a seedling age of 2.5 to 3.0 leaves, but the present invention is not limited to these.

[0032] Step 130 is a step of carrying out the first cultivation, in which young rice seedlings are cultivated in cultivated land for 15 to 30 days and fertilized with the second fertilizer composition to obtain mature rice plants. During the first cultivation step, the young rice seedlings are grown in cultivated land with a water depth of about 3 cm, which promotes root development and early tillering of the young rice seedlings, and the second fertilizer composition is applied at least once during the first cultivation step. In other words, the second fertilizer composition is applied at least once during the 15 to 30 days of the first cultivation step. Furthermore, by applying the second fertilizer composition to the young rice seedlings by foliar spraying, the utilization efficiency of the second fertilizer composition by the young rice seedlings can be increased, which causes a series of tillers to occur in the young rice seedlings and allows them to grow into mature rice plants. More precisely, in the first cultivation step, the second fertilizer composition is applied to the young rice plants at the early tillering stage when a collar appears on the fifth leaf of the main stem, and the young rice plants absorb nutrients from the second fertilizer composition, continue tillering, and grow into mature rice plants.

[0033] In the method 100 for cultivating low-protein rice of the present invention, the second fertilizer composition contains magnesium, manganese, iron, boron, zinc, and copper, and is based on 1 weight percent copper, 6 to 18 weight percent magnesium, 2 to 6 weight percent manganese, 1.5 to 6 weight percent iron, 1 to 3 weight percent boron, and 2 to 5 weight percent zinc. The components of the second fertilizer composition are not selected from major nutrients such as nitrogen, phosphate, and potassium, but are composed of trace elements such as magnesium, manganese, iron, boron, zinc, and copper, allowing the young rice plants to effectively utilize the nutrients in the first fertilizer composition applied in a previous stage.

[0034] Furthermore, when the young rice plants are first-crop rice plants, the first cultivation step involves cultivating the young rice plants in cultivated land for 20 to 30 days, and when the young rice plants are second-crop rice plants, the first cultivation step involves cultivating the young rice plants in cultivated land for 15 to 25 days, but the present invention is not limited to these.

[0035] Furthermore, depending on the type of cultivated land and the climate of the cultivation area, the first cultivation step may also include a mid-drying period, during which the irrigation water in the cultivated land is drained and the paddy soil is dried until it is roughly cracked. At this time, the roots of the young rice plants receive more oxygen, allowing the rice roots to grow downward. This is advantageous for absorbing nutrients in the later stages of cultivation, prevents lodging, and suppresses ineffective tillers, thereby promoting improvements in rice yield and quality, but the present invention is not limited to this.

[0036] Step 140 is a second cultivation step in which growing rice plants are cultivated in cultivated land for 15 to 35 days and fertilized with a third fertilizer composition to allow the growing rice plants to produce ears and fully mature, and the third fertilizer composition is applied at least once during the second cultivation step. Specifically, the growing rice plants begin to enter the reproductive stage during the second cultivation step. During this period, the water depth in the cultivated land is approximately 5 to 10 cm, and the leaf surface area of ​​the rice plants reaches its maximum value during the entire growing season. Nutrients are added to the grains through active photosynthesis. This, combined with the application of the third fertilizer composition at least once during the 15 to 35 days of the second cultivation step, causes the growing rice plants to enter the reproductive stage. More precisely, the application of the third fertilizer composition begins during the second cultivation step, from when the auricles appear on the ninth leaf of the main stem of the growing rice plants until the auricles appear on the tenth leaf. At this time, panicles begin to appear on the growing rice plants, and the rice plants enter the reproductive stage. After the auricle appears on the 10th leaf, panicle differentiation of the rice plant begins.

[0037] Specifically, in the method 100 for cultivating low-protein rice of the present invention, the third fertilizer composition contains magnesium, manganese, iron, boron, zinc, copper, phosphorus, nitrogen, and potassium, where copper is 1 weight percent, magnesium is 6 to 18 weight percent, manganese is 2 to 6 weight percent, iron is 1.5 to 6 weight percent, boron is 1 to 3 weight percent, and zinc is 2 to 5 weight percent. The weight percent of phosphorus in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of phosphorus in the first fertilizer composition, the weight percent of nitrogen in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of nitrogen in the first fertilizer composition, and the weight percent of potassium in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of potassium in the first fertilizer composition. The third fertilizer composition can be applied to growing rice plants by foliar spraying, thereby increasing the utilization efficiency of the third fertilizer composition by growing rice plants.

[0038] Furthermore, when the young rice plants are first-crop rice plants, the second cultivation step involves cultivating the growing rice plants in cultivated land for 15 to 25 days, and when the young rice plants are second-crop rice plants, the second cultivation step involves cultivating the growing rice plants in cultivated land for 15 to 25 days, but the present invention is not limited to these.

[0039] Step 150 is a harvesting step, where the rice plants are harvested to obtain a plurality of low protein rice plants, wherein the low protein rice plants have a protein content of less than 6 grams of protein per 100 grams of low protein rice.

[0040] Thus, the low-protein rice cultivation method 100 of the present invention involves first applying a first fertilizer composition containing specific ratios of phosphorus, nitrogen, and potassium as a basal fertilizer to cultivated land prior to the rice planting process, and then sequentially applying a second fertilizer composition and a third fertilizer composition after planting the young rice seedlings in the cultivated land. This three-stage cultivation method results in low protein rice with a low protein content of less than 6 grams of protein per 100 grams of low-protein rice. Therefore, the low-protein rice cultivated by the low-protein rice cultivation method 100 of the present invention can be used in dietary management plans for patients with chronic kidney disease and has excellent potential for market application.

[0041] [Examples and Comparative Examples]

[0042] In this experiment, young paddy rice plants of Tainan No. 16 were cultivated according to the low-protein rice cultivation method of the present invention to obtain the low-protein rice of Example 1. The nutritional composition of the low-protein rice of Example 1 was then analyzed to explain the protein content of the low-protein rice obtained by cultivation according to the low-protein rice cultivation method 100 of the present invention; however, for detailed steps and details of the low-protein rice cultivation method of the present invention, please refer to the description of the low-protein rice cultivation method 100, which will not be explained here.

[0043] In this experiment, the first fertilizer composition of the present invention was applied to the soil of cultivated land before rice planting, and the second fertilizer composition of the present invention and the third fertilizer composition of the present invention were applied sequentially at different cultivation periods. The young rice plants in this experiment could be selected from first-crop rice or second-crop rice, and when the young rice plants are first-crop rice, the first cultivation step involves cultivating the young rice plants in cultivated land for 20 to 30 days, and the second cultivation step involves cultivating the mature rice plants in cultivated land for 15 to 25 days. When the young rice plants are second-crop rice, the first cultivation step involves cultivating the young rice plants in cultivated land for 15 to 25 days, and the second cultivation step involves cultivating the mature rice plants in cultivated land for 15 to 25 days.

[0044] After cultivation using the low-protein rice cultivation method of the present invention, the young rice plants grew into mature rice plants, and the mature rice plants emerged and matured, resulting in the harvest of the low-protein rice of Example 1. Nutritional composition analysis was performed on the low-protein rice of Example 1 in accordance with CNS5035, Method for Determining Crude Protein in Foods (amended August 4, 1986), to demonstrate the protein content of the low-protein rice cultivated using the low-protein rice cultivation method 100 of the present invention. Furthermore, the potassium content of the low-protein rice of Example 1 was also tested in this experiment. The potassium content analysis was performed in accordance with the Revised General Provisions for Heavy Metal Testing Methods (MOHWH0014.03), Announcement No. 1031901169 of the Ministry of Health and Welfare of Taiwan dated August 25, 2014, to further demonstrate the feasibility of using the low-protein rice cultivated using the low-protein rice cultivation method 100 of the present invention in dietary management plans for patients with chronic kidney disease.

[0045] This experiment also included Comparative Examples 1 and 2, of which Comparative Example 1 was commercially available Koshihikari rice and Comparative Example 2 was commercially available Sinica rice. The protein and potassium contents of Comparative Examples 1 and 2 were obtained from the average nutritional values ​​of Koshihikari rice and Sinica rice in the food nutritional composition database published by the Food and Drug Administration, Ministry of Health and Welfare.

[0046] This experiment also included a control group, in which Tainan No. 16 rice seedlings were grown using known cultivation methods to observe differences in the protein content of the resulting Tainan No. 16 rice. Specifically, for the control group, which was the first-crop paddy rice, the total nitrogen fertilizer application rate was 110-140 kg / ha, the total phosphorus fertilizer application rate was 40-60 kg / ha, and the total potassium fertilizer application rate was 30-50 kg / ha. For the control group, which was the second-crop paddy rice, the total nitrogen fertilizer application rate was 90-120 kg / ha, the total phosphorus fertilizer application rate was 30-40 kg / ha, and the total potassium fertilizer application rate was 40-60 kg / ha.

[0047] Furthermore, in the control group, a basal fertilizer containing nitrogen, phosphorus, and potassium was applied to the cultivated land during the land preparation process. The nitrogen fertilizer amounted to 20%–30% of the total nitrogen fertilizer amount, the phosphorus fertilizer amounted to 100% of the total phosphorus fertilizer amount, and the potassium fertilizer amounted to 20% of the total potassium fertilizer amount. Then, 10–15 days after transplanting, a first top dressing containing nitrogen and potassium was applied. The nitrogen fertilizer amounted to 20% of the total nitrogen fertilizer amount and the potassium fertilizer amounted to 30% of the total potassium fertilizer amount. Next, 20–30 days after transplanting, a second top dressing containing nitrogen and potassium was applied. The nitrogen fertilizer amounted to 30% of the total nitrogen fertilizer amount and the potassium fertilizer amounted to 30% of the total potassium fertilizer amount. Furthermore, 45–70 days after transplanting (or when the young panicle length was 0.2–0.5 cm), the control group received ear dressing consisting of 20%–30% of the total nitrogen fertilizer amount and 20% of the total potassium fertilizer amount. After harvesting the control group, Tainan No. 16 rice, the protein content was tested using the CNS5035 food crude protein test method, and the differences in protein content between the low-protein rice grown using the low-protein rice cultivation method of the present invention, rice not grown using the low-protein rice cultivation method of the present invention, and commercially available rice were explained.

[0048] Please refer to Table 1, which shows the analysis results of the protein content of the low-protein rice of Example 1, the control Tainan No. 16 rice, the Koshihikari rice of Comparative Example 1, and the Sinica rice of Comparative Example 2. Table 1 JPEG2026042695000002.jpg66150

[0049] As shown in Table 1, the protein content of the low-protein rice of Example 1 was 4.2 grams per 100 grams, which was significantly lower than the 6.7 grams of the control Taiwan No. 16 rice, 7.6 grams of the Koshihikari rice of Comparative Example 1, and 7.0 grams of the Sinica rice of Comparative Example 1, indicating that the low-protein rice grown using the low-protein rice cultivation method of the present invention has a lower protein content than commercially available products.

[0050] See also Table 2, which shows the results of analyzing the potassium content of the low-protein rice of Example 1, Koshihikari rice of Comparative Example 1, and Sinica rice of Comparative Example 2. Table 2 JPEG2026042695000003.jpg33150

[0051] As shown in Table 2, the potassium content of the low-protein rice of Example 1 was 77 grams per 100 grams, which was lower than the 90 grams of Koshihikari rice of Comparative Example 1 and the 79 grams of Sinica rice of Comparative Example 1. This shows that the low-protein rice obtained by cultivating using the low-protein rice cultivation method of the present invention not only has a low protein content, but also a low potassium content. The low-protein rice obtained by cultivating using the low-protein rice cultivation method of the present invention can be applied to the dietary management plans of patients with chronic kidney disease and has excellent potential for market application.

[0052] Although the present invention has been disclosed by the embodiments as described above, they do not limit the present invention, and a person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and the protection scope of the present invention shall be as defined by the appended claims.

Claims

1. A method for cultivating low-protein rice, comprising: applying a first fertilizer composition to cultivated land, wherein the first fertilizer composition comprises phosphorus, nitrogen, and potassium, and the phosphorus is based on 1 weight percent, the nitrogen is based on 2.5 to 4.5 weight percent, and the potassium is based on 0.7 to 3 weight percent; A rice planting step in which young rice plants are planted in the cultivated land; a first cultivation step in which the paddy rice seedlings are cultivated in the cultivated land for 15 to 30 days and a second fertilizer composition is applied thereto to obtain grown paddy rice plants, wherein the second fertilizer composition is applied at least once in the first cultivation step, and the second fertilizer composition contains magnesium, manganese, iron, boron, zinc, and copper, and the copper is 1 weight percent, the magnesium is 6 to 18 weight percent, the manganese is 2 to 6 weight percent, the iron is 1.5 to 6 weight percent, the boron is 1 to 3 weight percent, and the zinc is 2 to 5 weight percent; a second cultivation step in which the growing rice plants are cultivated in the cultivated land for 15 to 35 days and a third fertilizer composition is applied thereto to cause the growing rice plants to enter a reproductive stage, and the third fertilizer composition is applied at least once in the second cultivation step, the third fertilizer composition comprises magnesium, manganese, iron, boron, zinc, copper, phosphate, nitrogen, and potassium, and wherein the copper is 1 weight percent, the magnesium is 6 to 18 weight percent, the manganese is 2 to 6 weight percent, the iron is 1.5 to 6 weight percent, the boron is 1 to 3 weight percent, and the zinc is 2 to 5 weight percent; and conducting a second cultivation, wherein the weight percent of the phosphoric acid in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of the phosphoric acid in the first fertilizer composition, the weight percent of the nitrogen in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of the nitrogen in the first fertilizer composition, and the weight percent of the potassium in the third fertilizer composition is 1 / 20 to 1 / 50 of the weight percent of the potassium in the first fertilizer composition; and harvesting the grown rice plants to obtain a plurality of low protein rice grains, wherein the protein content of the low protein rice grains is less than 6 grams of protein per 100 grams of the low protein rice grains.

2. 2. The method for cultivating low-protein rice according to claim 1, wherein the organic content of the cultivated land is 0.5 to 3.5%.

3. 2. The method for cultivating low-protein rice according to claim 1, wherein the pH value of the cultivated land is 5.5 to 7.

5.

4. 2. The method for cultivating low-protein rice according to claim 1, wherein the young rice plants are first-crop rice or second-crop rice.

5. 5. The method for cultivating low-protein rice according to claim 4, wherein when the young rice plants are the first-crop rice plants, the first cultivation step comprises cultivating the young rice plants in the cultivated land for 20 to 30 days.

6. 6. The method for cultivating low-protein rice according to claim 5, wherein when the young rice plants are the first-crop rice plants, the second cultivation step comprises cultivating the mature rice plants in the cultivated land for 15 to 25 days.

7. 5. The method for cultivating low-protein rice according to claim 4, wherein when the young rice plants are the second-crop rice plants, the first cultivation step comprises cultivating the young rice plants in the cultivated land for 15 to 25 days.

8. 8. The method for cultivating low-protein rice according to claim 7, wherein when the young rice plants are second-crop rice plants, the second cultivation step comprises cultivating the mature rice plants in the cultivated land for 15 to 25 days.

9. 2. The method for cultivating low-protein rice according to claim 1, wherein the second fertilizer composition is applied to the young rice plants by foliar spraying.

10. 2. The method for cultivating low-protein rice according to claim 1, wherein the third fertilizer composition is applied to the growing rice plants by foliar spraying.

11. A low-protein food product comprising low-protein rice, wherein the low-protein rice is produced using the cultivation method of any one of claims 1 to 10.

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