Method for preventing and treating rice runt seedlings based on shrimp-rice rotation mode

Abstract

The invention provides a method for preventing and treating rice runt seedlings based on a shrimp-rice rotation mode, and belongs to the technical field of agricultural planting. Comprising the following steps that in late May, a ground cage net is placed in a field, and commercial crayfishes are caught; sowing and raising seedlings in early June; gradually lowering the field water level in the middle of June; in the last ten days of June, the field water level is lowered into the breeding ditches, and field drying is conducted; after drying the field, applying a base fertilizer and preparing the field, keeping the field in thin water, and transplanting rice; after the rice is transplanted, performing water management; 15-25 days after the rice is transplanted, field weeds are prevented and killed by adopting a herbicide; 40-56 hours after the herbicide is sprayed, the field is kept thin in water and topdressing is carried out; after the additional fertilizer infiltrates into the soil, keeping thin water in the field until the last tillering stage of the rice; and after the rice grains are 92-98% mature, harvesting the rice. By means of the method, the technical problems that in a traditional shrimp-rice rotation mode, soil breathability is poor, gleying is serious, and runt seedlings appear in transplanted rice can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural planting, and particularly relates to a method for preventing and controlling rice stunt based on a shrimp-rice rotation mode. Background Art

[0002] Currently, in the shrimp-rice rotation mode, deep water is usually added to the paddy field in late October, and then shrimp seedlings or self-propagated shrimp seedlings are released for crayfish farming; after the commercial shrimp are fished in the first ten days and middle ten days of June of the next year, the water level of the paddy field is drained, and a season of rice is planted, and this cycle alternates. Therefore, from after the harvest of one season of rice to before the rice planting, the paddy field is basically in a flooded state.

[0003] Research shows that long-term flooding of the paddy field will cause changes in the soil redox potential, increase soil harmful substances, and ultimately lead to serious secondary gleying of the soil. At the same time, through investigation, it is found that after long-term flooding for crayfish farming, when the rice is planted by seedling raising and transplanting, and conventional water management is adopted after the rice transplanting, problems such as poor soil air permeability will occur, resulting in problems such as slow root hair growth, slow above-ground growth, yellowing of leaves, and few tillers of the transplanted seedlings, affecting the normal growth and development and yield formation of rice, and causing serious rice stunt phenomenon.

[0004] Therefore, solving the problem of rice stunt in transplanting in the long-term shrimp-rice rotation mode will promote the better development of the rice-shrimp industry. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preventing and controlling rice stunt based on a shrimp-rice rotation mode, and solve technical problems such as poor soil air permeability, serious gleying, and rice stunt in transplanting in the traditional shrimp-rice rotation mode.

[0006] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0007] The present invention provides a method for preventing and controlling rice stunt based on a shrimp-rice rotation mode, including the following steps:

[0008] (1) In late May, place a ground cage net in the field to catch commercial crayfish;

[0009] (2) In early June, sow and raise seedlings to extend the crayfish farming time;

[0010] (3) In mid-June, gradually lower the water level in the field;

[0011] (4) In late June, lower the water level in the field to the breeding ditch for field drying;

[0012] (5) After field drying, apply a base fertilizer and level the field, and keep a thin layer of water in the field for rice transplanting;

[0013] (6) After transplanting rice seedlings, adopt the method of alternating wet and dry to manage water;

[0014] (7) 15 - 25 days after transplanting rice seedlings, use herbicides to control weeds in the field; 40 - 56 h after spraying herbicides, keep a thin layer of water in the field and topdress fertilizers to promote tillering of rice; after the topdressing fertilizers penetrate into the soil, keep a thin layer of water in the field until the late tillering stage of rice;

[0015] (8) Do a good job in field drying, water management, topdressing panicle fertilizers and pest control during the late tillering stage of rice;

[0016] (9) When the rice grains reach 92 - 98% maturity, harvest the rice; after harvesting the rice, dry the field, deepen the water level in the aquaculture ditch, and release crayfish into the field for activities.

[0017] Preferably, in step (1), place 2 - 3 ground cage nets per mu; animal offal can be placed in the ground cage nets.

[0018] Preferably, in step (2), the method of sowing and raising seedlings is: sun the rice seeds and then soak and germinate them until the length of the germ reaches 1 / 3 - 2 / 3 of the length of the seeds.

[0019] Preferably, the time for sunning the seeds is 1 - 2 days; soak and germinate the seeds 3 - 5 days after sunning;

[0020] When soaking and germinating the seeds, soak them in a strong chlorine dioxide solution with a concentration of 0.8 - 1.2‰ or a bacteria and insect cleaning solution with a concentration of 0.8 - 1.2‰ for 5 - 6 hours, or soak them in a carbendazim solution with a concentration of 0.8 - 1.2‰ for 10 - 12 h; after soaking, rinse them clean with clear water, soak the seeds once every 8 - 12 h, and expose the seeds once every 8 - 12 h for 2 - 3 times of rising and falling.

[0021] Preferably, in step (4), the time for field drying is 7 - 10 days.

[0022] Preferably, in step (5), the ratio of nitrogen, phosphorus and potassium in the base fertilizer is 14 - 16:14 - 16:14 - 16, and the application rate is 30 - 40 kg / mu; the depth of field preparation is 25 - 35 cm.

[0023] Preferably, in step (5), before transplanting rice seedlings, also carry out pest control on the rice seedlings; the plant spacing at the time of transplanting rice is 20 - 25 cm, and the row spacing is 15 - 20 cm.

[0024] Preferably, step (6) also includes keeping a water layer of 2 - 3 cm in the field for 2 - 3 days after transplanting rice seedlings and before water management; after the water layer dries up, keep the field without a water layer for 5 - 7 days for field drying;

[0025] The method of alternate wet and dry is as follows: keep a water layer of 1 - 2 cm in the field, and after the water layer naturally dries up, keep the field without water layer for 1 - 2 days; the time for alternate wet and dry management is 10 - 15 days.

[0026] Preferably, the water layer of the thin water in steps (5) and (7) is 1 - 3 cm.

[0027] Preferably, the type of the top dressing in step (7) is urea, and the top dressing amount is 8 - 10 kg / mu;

[0028] The panicle fertilizer in step (8) is potassium dihydrogen phosphate, and the top dressing method is spraying, and the concentration during spraying is 0.2 - 0.3%;

[0029] The time for field drying in step (9) is 10 - 15 days, and the water level in the aquaculture trench is deepened to be 10 - 20 cm higher than the field surface.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. By adding ground cage nets, the present invention can improve the capture rate of commercial crayfish, reduce the stock of crayfish in the field, and thus reduce the feed consumption; at the same time, by using rice seeding and raising seedlings, the feeding time of crayfish in the paddy field can be extended, and the fishing volume in the paddy field can be increased, so as to achieve the purpose of cost reduction and efficiency increase.

[0032] 2. The present invention dries the field before rice transplanting, which can make the soil contact more oxygen and initially alleviate the problems such as the increase of harmful substances in the soil caused by long-term flooding.

[0033] 3. The rotary tillage depth of the present invention reaches more than 25 cm, which can promote the integration of the soil on the soil surface layer and the deep soil layer, and is beneficial to improving the soil quality.

[0034] 4. After rice transplanting, the present invention keeps a shallow water layer of 3 - 5 cm to promote the rooting and survival of the rice seedlings and avoid phenomena such as dead seedlings caused by direct sunlight; after the water layer naturally dries up, the alternate wet and dry water management is maintained, which is beneficial to soil ventilation, reduces the stock of harmful substances in the soil, and thus promotes the rooting and turning green of the rice seedlings.

[0035] 5. The method of the present invention can solve the technical problems of poor soil air permeability, serious gleying, and stunted seedlings in the traditional shrimp-rice rotation mode, and has a broad application prospect. Specific embodiments

[0036] The present invention provides a method for preventing rice stunted seedlings based on the shrimp-rice rotation mode, which includes the following steps:

[0037] (1) In late May, place ground cage nets in the field to catch commercial crayfish;

[0038] (2) In early June, sow seeds and raise seedlings to extend the breeding time of crayfish;

[0039] (3) In mid-June, gradually lower the water level in the field;

[0040] (4) In late June, lower the water level in the field to the breeding ditch and sun the field;

[0041] (5) After sunning the field, apply basal fertilizer and level the field, and keep a thin layer of water in the field for rice transplanting;

[0042] (6) After rice transplanting, adopt the method of alternating wet and dry for water management;

[0043] (7) 15 - 25 days after rice transplanting, use herbicides to control weeds in the field; 40 - 56 h after herbicide spraying, keep a thin layer of water in the field and top-dress fertilizer to promote rice tillering; after the top-dressing fertilizer penetrates into the soil, keep a thin layer of water in the field until the end of the rice tillering stage;

[0044] (8) Do a good job in sunning the field, water management, top-dressing panicle fertilizer and pest control in the late stage of rice tillering;

[0045] (9) When the rice grains reach 92 - 98% maturity, harvest the rice; after the rice is harvested, sun the field, deepen the water level in the breeding ditch, and release crayfish into the field for activities.

[0046] In the present invention, 2 - 3 ground cage nets are placed per mu in step (1), preferably 3; animal offal can be placed in the ground cage nets to catch commercial crayfish to the greatest extent.

[0047] In the present invention, when catching commercial crayfish in step (1), the crayfish that do not reach the selling specification need to be put back into the breeding field.

[0048] In the present invention, the method of sowing seeds and raising seedlings in step (2) is: sun the rice seeds and then soak and germinate them until the length of the germ reaches 1 / 3 - 2 / 3 of the seed length, preferably 1 / 2 of the seed length.

[0049] In the present invention, the rice seeds in step (2) are rice varieties suitable for local planting and having characteristics such as thick and strong stems, strong tillering ability, lodging resistance, strong tolerance, and excellent rice quality. The present invention also removes shriveled or unfilled rice seeds by winnowing or screening methods to screen out seeds with relatively consistent uniformity.

[0050] In the present invention, the time for sunning seeds is 1 - 2 days, preferably 2 days; soak and germinate the seeds 3 - 5 days after sunning seeds, preferably soak and germinate the seeds 4 days after sunning seeds;

[0051] When soaking seeds for germination, soak the seeds in a strong chlorine essence solution with a concentration of 0.8 - 1.2‰ or a bacteria and insect cleaner solution with a concentration of 0.8 - 1.2‰ for 5 - 6 hours, or soak the seeds in a carbendazim solution with a concentration of 0.8 - 1.2‰ for 10 - 12 hours; after soaking, rinse thoroughly with clean water, and adopt the method of "soaking during the day and exposing at night, three times of rising and falling", following the principle of less seeds, more exposure, and frequent water change. Soak the seeds once every 8 - 12 hours, and then expose the seeds once every 8 - 12 hours, and perform 2 - 3 times of rising and falling. For hybrid rice varieties, the water change time can be appropriately shortened during soaking.

[0052] In the present invention, preferably, when soaking seeds for germination, soak the seeds in a strong chlorine essence solution with a concentration of 1‰ or a bacteria and insect cleaner solution with a concentration of 1‰ for 5.5 hours, or soak the seeds in a carbendazim solution with a concentration of 1‰ for 11 hours; after soaking, rinse thoroughly with clean water, and adopt the method of "soaking during the day and exposing at night, three times of rising and falling", following the principle of less seeds, more exposure, and frequent water change. Soak the seeds once every 10 hours, and then expose the seeds once every 10 hours, and perform 3 times of rising and falling. For hybrid rice varieties, the water change time can be appropriately shortened during soaking.

[0053] In the present invention, in step (2) during seedling raising, sow the germinated rice seeds on the seedling bed. Sow according to the principle of sparse sowing for strong seedlings.

[0054] In the present invention, in step (4), the time for field drying is 7 - 10 days, preferably 8 days.

[0055] In the present invention, in step (5), the ratio of nitrogen, phosphorus, and potassium in the base fertilizer is 14 - 16:14 - 16:14 - 16, preferably 15:15:15, and the application rate is 30 - 40 kg / mu, preferably 35 kg / mu; the depth of field preparation is 25 - 35 cm, preferably 30 cm.

[0056] In the present invention, in step (5), before transplanting rice, pest and disease control is also carried out on the rice seedlings; the plant spacing during rice transplanting is 20 - 25 cm, preferably 22.5 cm, and the row spacing is 15 - 20 cm, preferably 17.5 cm.

[0057] In the present invention, in step (5), the specific method for pest and disease control is as follows: during the peak hatching period to the low-instar larval stage of Cnaphalocrocis medinalis eggs, or when the sheath blight rate of Chilo suppressalis reaches 3 - 5%, cooperate with pesticides for controlling diseases such as sheath blight and rice blast of rice for aerial spraying control.

[0058] In the present invention, step (6) further includes maintaining a water layer of 2 - 3 cm in the field for 2 - 3 days after rice transplanting and before water management. After the water layer dries up, keep the field without a water layer for 5 - 7 days for field drying; preferably, maintain a water layer of 2 cm in the field for 2 days, and after the water layer dries up, keep the field without a water layer for 6 days for field drying;

[0059] The method of alternate wetting and drying is as follows: maintain a water layer of 1 - 2 cm in the field, and after the water layer naturally dries up, keep the field without a water layer for 1 - 2 days; preferably, maintain a water layer of 2 cm in the field, and after the water layer naturally dries up, keep the field without a water layer for 2 days; the time of alternate wetting and drying management is 10 - 15 days, preferably 12 days.

[0060] In the present invention, the water layer of the thin water in steps (5) and (7) is 1 - 3 cm, preferably 2 cm.

[0061] In the present invention, the type of the topdressing in step (7) is urea, and the topdressing amount is 8 - 10 kg / mu, preferably 9 kg / mu;

[0062] The panicle fertilizer in step (8) is potassium dihydrogen phosphate, and the topdressing method is spraying, and the concentration during spraying is 0.2 - 0.3%.

[0063] The time of field drying in step (9) is 10 - 15 days, preferably 12 days, and deepen the water level in the breeding ditch to 10 - 20 cm higher than the field surface, preferably 15 cm.

[0064] In the present invention, the method of pest and disease control in step (8) is aerial spraying control; control for 1 - 3 times, preferably 2 times; the control method includes:

[0065] Rice blast: For leaf blast at the initial stage of disease occurrence, use 100 - 150 ml of 40% isoprothiolane EC or 30 - 40 g of 75% tricyclazole wettable powder per mu, and spray after diluting with 50 - 60 kg of water; for panicle neck blast at the booting stage and full heading stage of rice, use 30 - 40 g of 75% tricyclazole wettable powder or 100 - 150 ml of 40% isoprothiolane EC per mu, and spray each time after diluting with 50 - 60 kg of water.

[0066] Sheath blight: At the late tillering stage to booting stage of rice, when the diseased cluster rate reaches 10 - 15%, use 150 - 200 ml of 5% jinggangmycin aqueous solution or 20 - 30 ml of 24% thifluzamide suspension per mu, and spray after diluting with 50 - 60 kg of water, focusing on spraying the middle and lower leaves and leaf sheaths of rice.

[0067] False smut: 7 - 10 days before the rice heading stage, use 15 - 20 ml of 30% propiconazole·epoxiconazole EC or 10 - 15 ml of 43% tebuconazole suspension per mu, and spray after diluting with 50 - 60 kg of water.

[0068] Brown planthopper: When the number of insects per 100 hills reaches 1000 - 1500, use 20 - 30 g of 25% pymetrozine wettable powder or 20 - 30 ml of 10% nitenpyram aqueous solution per mu, and spray after diluting with 50 - 60 kg of water, focusing on spraying the middle and lower parts of rice.

[0069] Chilo suppressalis: During the tillering stage of rice, when the percentage of dead sheaths reaches 3-5%, or during the booting stage of rice, at the peak of egg mass hatching, spray 3000-5000 times the liquid of 20% chlorantraniliprole suspension or 1000-1500 times the liquid of 1.8% abamectin emulsifiable concentrate per mu, and mix with 50-60 kg of water for spraying.

[0070] Cnaphalocrocis medinalis: From the peak of egg hatching to the early larval stage of Cnaphalocrocis medinalis, spray 40-60 ml of 10% chlorantraniliprole suspension or 20-30 ml of 2.5% cyhalothrin emulsifiable concentrate per mu, and mix with 50-60 kg of water for spraying.

[0071] The technical solutions provided by the present invention will be described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0072] Example 1

[0073] A method for preventing and controlling rice stunt based on the shrimp-rice rotation mode, the steps are as follows:

[0074] (1) Before rice planting, in order to minimize the stock of crayfish in the breeding field, in late May, place ground cage nets in the breeding field, 3 per mu, for catching commercial crayfish. Crayfish that do not reach the selling specifications need to be put back into the breeding field.

[0075] (2) Sow and raise seedlings in early June to extend the breeding time of crayfish. The specific method of sowing and raising seedlings is as follows: a) Seed selection: Select rice varieties that are suitable for local planting and have characteristics such as thick stems, strong tillering ability, lodging resistance, strong tolerance, and excellent rice quality, specifically "Nongxiang 42". b) Seed drying: Remove shriveled or untrue rice seeds by winnowing to screen out seeds with relatively consistent uniformity, and select sunny days to dry the seeds for 2 days. c) Seed soaking and germination acceleration: Soak the seeds in a carbendazim solution with a concentration of 1‰ for 11 h; after soaking, rinse them with clean water, and adopt the method of "soaking during the day and exposing at night, three times up and down". Based on the principle of soaking less seeds, exposing more seeds, and changing water frequently, soak the seeds once every 10 h and expose the seeds once every 10 h for 3 times of up and down. d) Sowing: After soaking the seeds, sow the cracked chestnut seeds on the seedling bed. Sow according to the principle of sparse sowing to raise strong seedlings. After sowing, do a good job in field work such as bird prevention, pest control, and water management.

[0076] (3) On June 10th, use a barrier net to cover the drainage outlet to prevent crayfish from escaping with the water flow during drainage. Then open the drainage outlet of the breeding field and gradually lower the water level in the breeding field.

[0077] (4) On June 20th, the water level in the field has dropped to the breeding ditch, which is convenient for field drying. After the field surface is exposed, block the inlet and outlet of the inner field ridge of the field and start drying the paddy field for 8 days.

[0078] (5) After the field drying is completed, open the inlet of the inner ridge, fill the field with a 4-cm water layer, and then apply 35 kg of base fertilizer per mu. The ratio of nitrogen, phosphorus, and potassium in the base fertilizer is 15:15:15. Subsequently, use a rotary tillage machine that can deep-plow to level the field, and the tillage depth is 30 cm. After the paddy field is leveled, keep a thin layer of water in the field for rice transplanting. The plant spacing during transplanting is 22.5 cm, and the row spacing is 17.5 cm. Ensure sufficient seedlings in the field during transplanting.

[0079] Among them, 5 days before rice seedling transplanting, conduct a pest and disease control on the rice seedlings to prevent the seedlings from carrying diseases and pests into the field. The specific method of the pest and disease control is as follows: During the peak hatching period to the low-instar larval stage of Cnaphalocrocis medinalis eggs, or when the sheath blight rate of Chilo suppressalis reaches 4%, cooperate with pesticides for controlling diseases such as sheath blight and rice blast to conduct aerial spraying control. After the pest and disease control is completed, apply 10 kg of urea and 2 kg of potassium fertilizer per mu of seedling field to promote the accumulation of more nutrients in the seedlings to be transplanted.

[0080] (6) After rice transplanting, keep a 2-cm shallow water layer in the field to promote the rooting and survival of the seedlings. The shallow water layer is maintained for 2 days, and then let the water layer dry naturally. After the water layer dries, for the next 6 days, block the inlet and open the drain to dry the transplanted paddy field. Then adopt the method of alternating wet and dry for water management; the specific method of the alternating wet and dry is as follows: After the paddy field is dried, open the drain and block the inlet, keep a 2-cm thin water layer in the field. After the water layer dries naturally, keep the field surface without a water layer for 2 days, and cycle and alternate in turn using the method of alternating wet and dry. The management cycle of alternating wet and dry is 12 days.

[0081] (7) 20 days after rice transplanting, according to the types of weeds in the field, use herbicides to control the weeds in the field. 48 hours after spraying the herbicides, keep a 4-cm water layer in the field and apply 9 kg of urea per mu to promote rice tillering. After topdressing, let the water layer dry naturally and keep it for 2 days to promote the applied fertilizer to penetrate into the soil. After the topdressing penetrates into the soil, keep a 2-cm thin water layer in the field until the late tillering stage of rice.

[0082] (8) Field management in the late tillering stage of rice:: a) Field drying: In the middle and late tillering stage of rice, when the number of tiller seedlings reaches about 80% of the effective panicle number, or after the tiller seedlings are sealed, start field drying. Stop field drying when the rice leaves turn yellow and the white roots are concentrated on the soil surface. b) Water management: Immediately after drying, refill the field with 2 cm of water and keep it in a wet-dry state to promote rice ear formation; when the rice is in the heading stage, keep a 3-cm water layer in the field. 7 days after full heading, keep the field in an alternating wet and dry state (the method is the same as in step (6)); in the yellow ripening stage of rice, lower the water level into the aquaculture ditch and conduct field drying to prepare for harvesting the rice. c) Topdress panicle fertilizer: During the booting stage of rice, potassium dihydrogen phosphate can be sprayed to improve the plumpness of grains; the spraying concentration is 0.25%. d) Pest and disease prevention and control: Use aerial spraying for pest and disease prevention and control, and conduct 2 times of control; the control method is as follows:

[0083] Rice blast: For leaf blast at the initial stage of disease occurrence, use 125 ml of 40% isoprothiolane EC or 35 g of 75% tricyclazole wettable powder per mu, and spray after diluting with 55 kg of water; for panicle neck blast at the rice booting stage and full heading stage, use 35 g of 75% tricyclazole wettable powder or 125 ml of 40% isoprothiolane EC per mu, and spray once each after diluting with 55 kg of water.

[0084] Sheath blight: At the late tillering stage to booting stage of rice, when the diseased cluster rate reaches 12%, use 180 ml of 5% jinggangmycin aqueous solution or 25 ml of 24% thifluzamide suspension per mu, and spray after diluting with 55 kg of water, focusing on spraying the middle and lower leaves and leaf sheaths of the rice.

[0085] False smut of rice: 7 days before the rice heading, use 18 ml of 30% propiconazole·epoxiconazole EC or 12 ml of 43% tebuconazole suspension per mu, and spray after diluting with 55 kg of water.

[0086] Brown planthopper: When the number of insects per 100 hills reaches 1250, use 25 g of 25% pymetrozine wettable powder or 25 ml of 10% nitenpyram aqueous solution per mu, and spray after diluting with 55 kg of water, focusing on spraying the middle and lower parts of the rice.

[0087] Yellow stem borer: At the tillering stage of rice, when the dead sheath rate reaches 4%, or at the booting stage of rice, at the peak of egg mass hatching, use 4000-fold liquid of 20% chlorantraniliprole suspension or 1200-fold liquid of 1.8% abamectin EC per mu, and spray after diluting with 55 kg of water.

[0088] Cnaphalocrocis medinalis Guenée: At the peak of egg hatching to the early larval stage of Cnaphalocrocis medinalis Guenée, use 50 ml of 10% chlorantraniliprole suspension or 25 ml of 2.5% cyhalothrin EC per mu, and spray after diluting with 55 kg of water.

[0089] (9) After the rice grains reach 95% maturity, harvest the rice using a harvester; after harvesting the rice, dry the field for 12 days, deepen the water level in the aquaculture ditch to 15 cm above the field surface, and release crayfish into the field for activities.

[0090] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for preventing and controlling rice seedling stunting based on a shrimp-rice rotation model, characterized in that: The steps include: (1) In late May, ground traps were placed in the fields to catch commercial crayfish; (2) In early June, sowing and raising seedlings to extend the breeding period of crayfish; (3) In mid-June, gradually lower the field water level; (4) In late June, the water level in the field is lowered to the breeding ditch and the field is dried; (5) After sun drying, apply basal fertilizer and prepare the field, and keep the field thinly watered for rice transplanting; (6) After rice is transplanted, water management is carried out by alternating dry and wet conditions; (7) 15 to 25 days after rice transplanting, use herbicides to control weeds in the field; 40 to 56 hours after spraying the herbicide, keep the field thinly watered and apply topdressing to promote rice tillering; after the topdressing has penetrated into the soil, keep the field thinly watered until the end of rice tillering; (8) In the later stage of rice tillering, do a good job in drying the fields, managing water, applying ear fertilizer, and controlling diseases and insect pests; (9) When the rice grains reach 92-98% maturity, the rice is harvested. After the rice is harvested, the fields are dried, the water level in the breeding ditch is deepened, and crayfish are released into the fields to move around.

2. The method according to claim 1, characterized in that In step (1), 2 to 3 ground cage nets are placed per acre; animal scraps can be placed in the ground cage nets.

3. The method according to claim 1, characterized in that The method for sowing and raising rice seedlings in step (2) is: drying the rice seeds in the sun and then soaking them for germination until the length of the embryo reaches 1 / 3 to 2 / 3 of the length of the seeds.

4. The method according to claim 3, characterized in that The drying time of the seeds is 1 to 2 days; after drying the seeds for 3 to 5 days, the seeds are soaked and germinated; During the soaking and germination, a strong chlorine solution with a concentration of 0.8-1.2‰ or a fungicide solution with a concentration of 0.8-1.2‰ is used to soak the seeds for 5-6 hours, or a carbendazim solution with a concentration of 0.8-1.2‰ is used to soak the seeds for 10-12 hours; after soaking, rinse with clean water, soak the seeds once for 8-12 hours, and then expose the seeds once for the next 8-12 hours, and perform 2-3 times of lifting and lowering.

5. The method according to claim 1, characterized in that The time for drying the field in step (4) is 7 to 10 days.

6. The method according to claim 1, characterized in that The ratio of nitrogen, phosphorus and potassium in the base fertilizer in step (5) is 14-16:14-16:14-16, and the application amount is 30-40 kg / mu; the depth of the field preparation is 25-35 cm.

7. The method according to claim 1, characterized in that In step (5), the rice seedlings are also subjected to pest and disease control before transplanting the rice; the plant spacing during rice transplanting is 20 to 25 cm, and the row spacing is 15 to 20 cm.

8. The method according to claim 1, characterized in that Step (6) also includes maintaining a 2-3 cm water layer in the field for 2-3 days after rice transplanting and before water management, and maintaining a water-free layer for 5-7 days for sun drying after the water layer dries up; The method of alternating wet and dry conditions is: maintaining a 1-2 cm water layer in the field, and maintaining a water-free layer for 1-2 days after the water layer dries up naturally; the time for the alternating wet and dry conditions is 10-15 days.

9. The method according to claim 1, characterized in that The water layer of the thin water in step (5) and step (7) is 1 to 3 cm.

10. The method according to claim 1, characterized in that The topdressing in step (7) is urea, and the amount of topdressing is 8-10 kg / mu; In step (8), the ear fertilizer is potassium dihydrogen phosphate, and the topdressing method is spraying, and the concentration during spraying is 0.2-0.3%; The time for drying the field in step (9) is 10 to 15 days, and the water level in the breeding ditch is deepened to be 10 to 20 cm higher than the field surface.