Planting method for increasing yield of double cropping rice in medium-low-yield rice field

Abstract

The invention relates to a planting method for improving the yield of a medium-low-yield rice field under a southern double cropping rice system, which comprises the following steps of: planting commercial crop potatoes in winter on the medium-low-yield rice field in which double cropping rice is planted, harvesting the potatoes, returning straws to the field, ploughing and leveling soil, and planting the double cropping rice for paddy-upland rotation. According to the planting method, the soil quality can be improved, the soil loosening degree can be enhanced, the soil fertilizer retention capacity can be improved, the soil organic matter content can be increased, the yield of rice in medium and low yield fields can be increased, and the method has economic benefits and practicability and has certain popularization value.

Description

Technical Field

[0001] The invention belongs to the field of crop cultivation and relates to a planting method for improving the yield of double-season rice in medium- and low-yield rice fields in the south. Background Art

[0002] The area of ​​medium and low-yield farmland in my country accounts for as much as 70% of the total cultivated land area. Improving medium and low-yield farmland can not only alleviate the food crisis, but also restore and protect the agricultural ecosystem. In different regions, different types of low-yield farmland are improved and transformed from aspects such as biotechnology improvement (such as introducing high-efficiency nitrogen-fixing strains and breeding stress-resistant crop varieties), chemical technology improvement (such as applying soil conditioners and precision fertilization), physical improvement (such as deep tillage and loosening the soil, building drainage and irrigation systems), soil fertilization improvement (such as increasing the application of organic fertilizers and promoting straw return to the field) and comprehensive technology improvement (such as integrated water and fertilizer integration, reasonable matching of crop planting and other agronomic measures). The current improvement measures are mainly engineering measures, biological measures and agricultural measures. Although these measures can achieve the purpose of improving soil fertility to a certain extent, they also have disadvantages, such as high initial costs, insignificant short-term effects, damage to ecological balance, environmental risks, water resource pressure and poor climate adaptability. Therefore, when implementing improvement measures for medium and low-yield farmland, it is necessary to comprehensively consider soil characteristics, regional resource conditions and socio-economic factors, and adopt scientific and sustainable improvement plans.

[0003] The traditional double-season rice planting system is the main agricultural production method in the southern region. However, there is often a large area of ​​winter idle fields in the winter after double-season rice planting, resulting in low resource utilization. Moreover, the medium and low-yield fields in the south (such as Guangdong, Jiangxi, and Hunan) generally have problems such as soil acidification, compaction, and low organic matter content, which seriously restrict the improvement of agricultural productivity. The cultivation method adopted to increase the rice yield in medium and low-yield fields is mostly to plant green manure crops, but we found that the differences in adaptability of different winter crops to soil and climate, the economic benefit evaluation of rotation patterns, and technical support all restrict the increase in the yield of medium and low-yield rice fields. Therefore, it is an urgent problem for technicians in this field to develop, explore and promote the best rotation model suitable for medium and low-yield fields in the south, and provide a scientific basis for achieving high-yield and efficient agriculture and ecological sustainability. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a planting method for increasing the yield of medium and low-yield rice fields under the double-season rice system. The method uses a water-dry rotation cultivation method, that is, dry farming in winter and water farming in early and late seasons, and selects suitable crops to play a positive role in enhancing soil fertility and improving soil structure, thereby increasing the total annual rice yield.

[0005] To achieve the above purpose, the following technical solutions are included.

[0006] A planting method for increasing the yield of double-season rice in medium- and low-yield paddy fields, comprising the following steps:

[0007] S1. In mid-to-late November of the first year, on the medium-to-low-yield fields that need to be improved, the fields are plowed and ridges are formed to plant potatoes; in mid-March of the second year, the potatoes are harvested and their straw is returned to the fields;

[0008] S2. In late March of the second year, the fields are soaked, plowed and leveled, and then early-season rice is transplanted on the prepared fields in early April. The early-season rice is harvested in mid-July of the second year, and the rice straw is returned to the fields;

[0009] S3. In late July of the second year, the fields are soaked, plowed and leveled, and then late-season rice is transplanted on the prepared fields in early August. The late-season rice is harvested in mid-November of the second year, and the rice straw is returned to the fields;

[0010] S4. Repeat steps S1 to S3 to carry out the next round of crop rotation.

[0011] In some embodiments, the low- and medium-yield rice fields are located in the south, preferably in the low- and medium-yield rice fields in South China. Further, the South China is the double-season rice planting area in Guangdong, Guangxi, Fujian, and Hainan.

[0012] In some embodiments, when ridges are formed to plant potatoes in step S1, the ridge height is 0.2-0.25 m, the ridge width is 0.7-0.8 m, and the ridge spacing is 0.3-0.4 m.

[0013] In some of the embodiments, the potatoes are planted in double rows on ridges, with a plant spacing of 0.2-0.25 m and a row spacing of 0.3-0.4 m.

[0014] In some of the embodiments, the potato is of Kunyuan 9 variety.

[0015] In some embodiments, after ridge formation in step S1, digging trenches on the ridge body for fertilization is performed, and the fertilization is applied at one time according to the ratio of organic fertilizer to compound fertilizer = 2:1, wherein the N+P in the compound fertilizer is 2 O 5 +K 2 O≥41%, N, P, K follow the ratio of 12-11-18.

[0016] In some of the embodiments, in step S2 and step S3, plowing and leveling the field means flooding the field with water and then plowing 1 to 2 times with a plowing depth of 0.2 to 0.3 m, so that the winter crop straw is turned over and buried to ensure deep accelerated decomposition, which is beneficial to the growth of rice roots.

[0017] In some embodiments, the rice is Erguangxiangzhan No. 3 rice variety.

[0018] The present invention provides a planting method for increasing the yield of medium - low - yield paddy fields under the double - cropping rice system. This method enhances the fertilizer - retaining capacity of medium - low - yield paddy fields and increases the soil organic matter and carbon content, especially the soil stable carbon content, which shows a highly significant increase after the late rice harvest, by planting suitable winter cash crops - potatoes and through the paddy - dry rotation cultivation method in the double - cropping rice planting in the south. These soil improvement effects further promote the increase in the relative chlorophyll content of rice leaves and the enhancement of photosynthesis efficiency, thus having a positive impact on the morphological growth of rice and ultimately increasing the yield of double - cropping rice. Brief Description of the Drawings

[0019] Figure 1 Field photos of medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0020] Figure 2 Changes in the plant height of rice in medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0021] Figure 3 Changes in the SPAD of rice in medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0022] Figure 4 Changes in the net photosynthetic rate of rice in medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0023] Figure 5 Changes in the biomass of rice in medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0024] Figure 6 Changes in the tiller number of rice in medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0025] Figure 7 Changes in the theoretical yield of rice in medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0026] Figure 8 Changes in the actual yield of rice in medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0027] Fig. 9 Changes in the soil organic carbon content of medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0028] Fig.10 Changes in the soil active carbon content of medium - low - yield paddy fields under different rotation patterns in Test Example 1.

[0029] Fig.11 Changes in the soil stable carbon content of medium - low - yield paddy fields under different rotation patterns in Test Example 1. Detailed Embodiments

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] The experimental methods in the following examples without specifying specific conditions are usually carried out under conventional conditions or conditions recommended by the manufacturers. The various commonly used chemical reagents used in the examples are all commercially available products.

[0032] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0033] In addition, as used in the present invention, the term "or" is an inclusive "or" symbol and is equivalent to the term "and / or", unless the context clearly dictates otherwise. The term "based on" is not exclusive and allows for being based on other factors not described, unless the context clearly dictates otherwise. In addition, throughout the specification, the meanings of "a", "an", and "the" include plural referents. The meaning of "in..." includes "in..." and "on...".

[0034] Some embodiments of the present invention relate to a crop rotation method for increasing the yield and soil carbon content of medium and low-yield rice fields in the south, comprising the following steps:

[0035] In mid-to-late November of the first year, on the medium-to-low-yield fields that need to be improved, the fields are plowed and harrowed, and winter dryland cash crops, oil crops, or green manure crops are planted on the plowed fields; in mid-March of the second year, the winter dryland cash crops and oil crops are harvested and their straw is returned to the fields, and the winter dryland green manure crops are plowed and fermented during the flowering period;

[0036] In late March of the second year, the field is soaked, plowed and leveled, and then early-season rice is transplanted on the prepared field in early April, and the early-season rice is harvested in mid-July of the second year;

[0037] In late July of the second year, the fields are soaked in water, plowed and leveled, and then late-season rice is transplanted on the prepared fields in early August. The late-season rice is harvested in mid-November of the second year.

[0038] Repeat steps 1 to 3 for the next round of crop rotation.

[0039] Among them, in some embodiments, after the field is plowed and leveled in step 1, ridges are formed and winter economic crops are planted, with a ridge height of 0.2-0.25m, a ridge width of 0.7-0.8m, and a ridge spacing of 0.3-0.4m. The winter economic crops are planted in double rows on the ridges, with a plant spacing of 0.2-0.25m and a row spacing of 0.3-0.4m.

[0040] Among them, in some embodiments, after the field is plowed and leveled in step 1, furrows are dug to plant winter oil crops, with a furrow width of 0.8 to 1 m, a furrow height of 0.15 to 0.2 m, and a furrow spacing of 0.2 to 0.3 m, and the winter oil crops are sown on the furrow surface.

[0041] In some embodiments, after the field is plowed and leveled in step 1, the winter green manure crop is sown on the field.

[0042] Preferably, the winter cash crop is potato, and a high-quality, high-yield and highly adaptable variety (Kunyuan No. 9) is selected. The winter oil crop is rapeseed, and an early-maturing and stress-resistant variety (Qingza No. 7) is selected.

[0043] In some embodiments, in step 2 and step 3, plowing and leveling the field means flooding the field with water and then plowing it 1 to 2 times, with a plowing depth of 0.2 to 0.3 m.

[0044] Preferably, the rice is planted with 4 to 5 seedlings per hole, with a row spacing of 0.2 to 0.3 m and a plant spacing of 0.1 to 0.2 m.

[0045] The following is a further detailed description of a method for rotating paddy fields and drylands in accordance with a specific embodiment of the present invention that can improve the yield of medium and low-yield paddy fields in the south and the carbon content of the soil.

[0046] Example 1

[0047] Step 1: Planting and harvesting potatoes from November of the first year to March of the second year (1.1) Land preparation and fertilization: In mid-to-late November of the first year, on the medium and low-yield fields that need to be improved, the fields are plowed and harrowed, and ridges are made on the plowed fields. The ridge height is 0.2m, the ridge width is 0.8m, and the ridge spacing is 0.4m. After ridges are made, dig trenches on the ridges and fertilize. Fertilization is applied at a ratio of organic fertilizer to compound fertilizer = 2:1, and 3750kg·hm2 of organic fertilizer is applied at once. -2 , compound fertilizer 1875kg·hm -2 (N+P 2 O 5 +K 2 O≥41%, 12-11-18);

[0048] (1.2) Planting: In this embodiment, the potato seeds used are high-quality, high-yield, and highly adaptable Kunyuan No. 9, and potatoes with 2 to 3 buds are planted in double rows on the ridges, with a plant spacing of 0.25 m and a row spacing of 0.4 m;

[0049] (1.3) Timely harvest: Harvest potatoes in mid-March of the following year and return their stalks to the fields.

[0050] Step 2: Planting and harvesting of early rice from March to July of the second year (2.1) Raising seedlings: Raising early rice seedlings in early March, using the Guangxiangzhan No. 3 rice variety suitable for early planting in southern regions;

[0051] (2.2) Land preparation and fertilization: In late March, the fields were irrigated to soften them, plowed and leveled, and fertilized according to the mixed fertilizer (N+P 2 O 5 +K 2 O≥50%, 24-7-19) (purchased from Guangdong Tianhe Sino-Fertilizer Co., Ltd.) 600 kg·hm -2 1. Apply base fertilizer: tillering fertilizer: ear fertilizer in a ratio of 4:3:3;

[0052] (2.3) Transplanting: In early April, early season rice was transplanted into the prepared fields, with 4 seedlings per hole, 0.3 m spacing between rows and 0.15 m between plants.

[0053] (2.4) Timely harvest: Rice is harvested in mid-July and its straw is returned to the fields.

[0054] Step 3: Planting and harvesting of late rice from July to November of the second year (3.1) Raising seedlings: Raising late rice seedlings in early July, using the rice variety No. 2 Guangxiangzhan 3 suitable for late planting in southern regions;

[0055] (3.2) Land preparation and fertilization: In mid-July, the fields were irrigated to soften them, plowed and leveled, and fertilized according to the mixed fertilizer (N+P 2 O 5 +K 2 O≥50%, 24-7-19) 600kg·hm -2 , apply according to the ratio of base fertilizer: tillering fertilizer: ear fertilizer = 4:3:3;

[0056] (3.3) Transplanting: In early August, late season rice was transplanted into the prepared fields, with 4 seedlings per hole, 0.3 m spacing between rows and 0.15 m between plants.

[0057] (3.4) Timely harvest: Rice is harvested in mid-November and its straw is returned to the fields.

[0058] Step 4: Repeat steps 1 to 3 for the next round of crop rotation.

[0059] Example 2

[0060] Step 1: Planting and harvesting of rapeseed from November of the first year to March of the second year (1.1) Land preparation and fertilization: In mid-to-late November of the first year, on the medium and low-yield fields that need to be improved, the fields are plowed and harrowed, and furrows are dug. The width of the furrow is 1m, the height of the furrow is 0.15m, and the distance between the furrows is 0.3m. 450kg·hm2 of compound fertilizer is applied as base fertilizer. -2 (N+P 2 O 5 +K 2 O≥41%, 12-11-18);

[0061] (1.2) Sowing: In this example, the early-maturing and stress-resistant rapeseed variety Qingza No. 7 was selected and sown at a rate of 7.5 kg / hm2. -2 , soak the rapeseed in clean water for 4 hours, dry it slightly, and sow the rapeseed on the bed surface;

[0062] (1.3) Timely harvest: Harvest rapeseed and return its straw to the field in mid-March of the following year.

[0063] Step 2: Same as step 2 in Example 1.

[0064] Step 3: Same as step 3 in Example 1.

[0065] Step 4: Repeat steps 1 to 3 for the next round of crop rotation.

[0066] Example 3

[0067] Step 1: Planting and harvesting of Chinese milk vetch from November of the first year to March of the second year (1.1) Land preparation: In mid-to-late November of the first year, turn over and harrow the fields in the medium and low yield fields that need to be improved;

[0068] (1.2) Seed treatment: In this example, the early-maturing variety Yijiang seeds suitable for planting in the south were selected from Astragalus sinensis, and the sowing rate was 30 kg·hm -2 To remove the seed coat on the surface of the astragalus seeds, wash the seeds, soak them in clean water for 8 hours, dry them slightly, and set aside;

[0069] (1.3) Sowing: Evenly sow the milk vetch seeds and water the fields in time to keep them moist during the seedling stage;

[0070] (1.4) Timely harvest: Wait until mid-March of the following year and then turn the astragalus into compost and return it to the field.

[0071] Step 2: Same as step 2 in Example 1.

[0072] Step 3: Same as step 3 in Example 1.

[0073] Step 4: Repeat steps 1 to 3 for the next round of crop rotation.

[0074] Comparative Example 1

[0075] Except that winter crops are not planted, the remaining steps are the same as those in Example 1.

[0076] Test Example 1

[0077] According to the method of winter crop and double-season rice rotation cultivation described in Examples 1-3, a field test was conducted. The test site was set up in the low-yield rice field ( Figure 1 ), the physical and chemical properties of the soil in the 0-20 cm soil layer of the selected fields before the experiment are shown in Table 1.

[0078] Table 1 Physical and chemical properties of basic soil in the test area

[0079]

[0080] According to the relevant standards of the second national soil census, the soil is classified as follows: Grades 1 to 2 are high fertility plots, Grades 3 to 4 are medium fertility plots, and Grades 5 and below are low fertility plots:

[0081] Table 2 Classification standards of main soil nutrients

[0082]

[0083] This test case sets up 4 treatments, each treatment plot is 8×7m, each treatment is repeated 3 times, and there are 12 plots in total:

[0084] (1) Comparative Example 1 (WR);

[0085] (2) Example 1 (PR);

[0086] (3) Example 2 (OR);

[0087] (4) Example 3 (CR);

[0088] The experiment was carried out according to the set treatment. Three holes were randomly selected from each treatment plot at the tillering stage, booting stage, flowering stage, and maturity stage of rice. The fully expanded second leaf was used as the object, and the SPAD ( Figure 2 ) and the net photosynthetic rate was measured using the LI-6800 portable photosynthetic meter ( Figure 3 ). Three holes were randomly selected from each treatment plot to investigate the rice plant height at the rice seedling stage, tillering stage, booting stage, flowering stage, and maturity stage ( Figure 4 ), above-ground and below-ground biomass ( Figure 5 At the rice harvest period, three rice holes were randomly selected from each treatment plot to determine the number of tillers ( Figure 6 ) and theoretical yield ( Figure 7 ), and randomly select 1m 2Area to collect and calculate actual output ( Figure 8 After rice harvest, the original soil column of 0-20 cm soil layer was collected to determine the soil bulk density; the soil of 0-20 cm soil layer was collected by 5-point sampling method in each treatment plot and mixed into a soil sample. The cation exchange capacity was determined by hexaammine cobalt trichloride extraction spectrophotometry, the total carbon and total nitrogen in the soil were determined by elemental analyzer (Table 3), and the soil organic carbon content was determined by potassium dichromate oxidation method ( Fig. 9 ) and calculated the organic matter content. The soil active organic carbon was determined using 0.333 mol·L -1 Potassium permanganate colorimetric determination ( Fig.10 ), and the soil steady-state carbon content was calculated according to the formula: steady-state carbon = total organic carbon - active organic carbon ( Fig.11 ). The result data is as follows Figure 2 to Figure 11 , as shown in Table 3.

[0089] The relative chlorophyll content and net photosynthetic rate of rice at different important growth stages are as follows Figure 2 , Figure 3 As shown, compared with Comparative Example 1, Example 1, Example 2, and Example 3 improve the SPAD of the tillering stage, booting stage, and flowering stage of early rice and the tillering stage, booting stage, and flowering stage of late rice. After taking Example 1, Example 2, and Example 3, the net photosynthetic rate of double-season rice is improved to a certain extent, which is mainly reflected in late rice.

[0090] For the morphological growth of rice in medium and low-yield fields, the results obtained are as follows Figure 4 , Figure 5 As shown, compared with Comparative Example 1, the treatments of Example 1, Example 2, and Example 3 can significantly increase the plant height and biomass of early rice and late rice at different growth stages, which is mainly beneficial to the accumulation of aboveground biomass, and the increase in Example 1 is more significant. The effect of increasing the number of tillers of early rice and late rice under the treatments of Example 1, Example 2, and Example 3 is better than that of Comparative Example 1 (see Figure 6 ), among which the effect of Example 1 is more significant. For the change of rice yield in medium and low yield fields, from Figure 7 , Figure 8 It can be seen that the theoretical yield and actual yield of early rice and late rice under the cultivation modes of Example 1, Example 2 and Example 3 are higher than those of the cultivation mode of Comparative Example 1, among which the mode of Example 1 is the best.

[0091] As for the soil changes in medium- and low-yield rice fields, the data in Table 3 show that after adopting the crop rotation cultivation methods of Examples 1, 2, and 3 of the present invention, the soil bulk density of medium- and low-yield rice fields is lower than that of Comparative Example 1, and the change in Example 1 is the most obvious. At the same time, compared with the winter fallow field of Comparative Example 1, the method of planting potatoes in Example 1 of the present invention shows certain advantages in soil improvement effect, which is specifically reflected in the improvement of soil cation exchange capacity (CEC), and the increase of soil organic matter, total carbon and total nitrogen content. In addition, compared with Comparative Example 1, the content of soil organic carbon and stable carbon after early rice and late rice harvest in the mode of Example 1 is increased (see Fig. 9 , Fig.11 ), wherein the steady-state carbon content of the soil increases significantly after the harvest of late rice. In general, the increasing trend of potato planting is more significant than that of rapeseed and astragalus. The active carbon content of the soil in the modes of Example 1, Example 2, and Example 3 all shows a decreasing trend after the harvest of early rice, and an increasing trend after the harvest of late rice. These improvements indicate that the planting method of the present invention has a positive effect in enhancing soil fertility and improving soil structure.

[0092] The results of this test case show that planting dryland crops (potatoes) in medium- and low-yield rice fields in winter can enhance soil looseness, improve soil fertilizer retention capacity, and increase soil organic matter and carbon content compared to leaving the fields idle in winter. These soil improvement effects further promote the increase in the relative content of chlorophyll in rice leaves and the enhancement of photosynthesis efficiency, thereby having a positive impact on the morphological growth of rice and ultimately increasing rice yields. Among them, the yield-increasing effect of planting cash crops such as potatoes in winter is particularly significant (see Figure 7-Figure 11 ).

[0093] Table 3 Changes in soil properties of medium and low-yield paddy fields under different crop rotation patterns

[0094]

[0095]

[0096] Note: The numbers after “±” are standard errors of the mean (n=3), and different lowercase letters indicate significant differences at the 0.05 level.

[0097] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A planting method for increasing the yield of double-season rice in medium- and low-yield paddy fields, characterized in that: The steps include: S1. In mid-to-late November of the first year, on the medium-to-low-yield fields that need to be improved, the fields are plowed and ridges are formed to plant potatoes; in mid-March of the second year, the potatoes are harvested and their straw is returned to the fields; S2. In late March of the second year, the fields are soaked, plowed and leveled, and fertilized. In early April, early-season rice is transplanted on the prepared fields. In mid-July of the second year, the early-season rice is harvested and the rice straw is returned to the fields. S3. In late July of the second year, the fields are soaked, plowed and leveled, and fertilized. In early August, late-season rice is transplanted on the prepared fields. In mid-November of the second year, the late-season rice is harvested and the rice straw is returned to the fields. S4. Repeat steps S1 to S3 to carry out the next round of crop rotation.

2. The planting method according to claim 1, characterized in that: The medium and low-yield rice fields are located in the south, preferably in South China.

3. The planting method according to claim 1, characterized in that: When ridges are formed to plant potatoes in step S1, the ridge height is 0.2-0.25 m, the ridge width is 0.7-0.8 m, and the ridge spacing is 0.3-0.4 m.

4. The planting method according to claim 3, characterized in that: The potatoes are planted in double rows on ridges, with a plant spacing of 0.2-0.25 m and a row spacing of 0.3-0.4 m.

5. The planting method according to claim 1, characterized in that: The potato is of the Kunyuan No. 9 variety.

6. The planting method according to any one of claims 1 to 5, characterized in that: After ridge formation in step S1, trenches are opened on the ridge body for fertilization. The fertilization is applied at one time according to the ratio of organic fertilizer to compound fertilizer = 2:1, wherein N+P2O5+K2O in the compound fertilizer is ≥41%, and the ratio of N, P, K is 12:11:

18.

7. The planting method according to any one of claims 1 to 5, characterized in that: In step S2 and step S3, fertilization is performed according to a mixed fertilizer N+P2O5+K2O≥50%, the ratio of N, P, K is 24:7:19, and the ratio of base fertilizer: tillering fertilizer: ear fertilizer is 4:3:

3.

8. The planting method according to any one of claims 1 to 5, characterized in that: In step S2 and step S3, plowing and leveling the field means flooding the field with water and then plowing it 1 to 2 times with a plowing depth of 0.2 to 0.3 m.

9. The planting method according to any one of claims 1 to 5, characterized in that: The rice is planted in a pattern of 4 to 5 seedlings per hole, with a row spacing of 0.2 to 0.3 m and a plant spacing of 0.1 to 0.2 m.

10. The planting method according to any one of claims 1 to 5, characterized in that: The rice is the rice variety Er Guangxiangzhan No. 3.

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