Stay and grow. When supplying water, the temperature in early autumn is high, the sun is abundant and warm, and the straw and rice stubble undergo a centralized decomposition and corruption process under the soaking of warm water. If you don't do it well, the water is black and red, and the toxicity in the water seriously threatens the survival of the mother shrimp, especially the mother shrimp, which is a life-and-death profit and loss plan related to the fry, yield and benefit in the coming year.
Let's keep less and store less. Once the mother shrimp is scattered, the pond mouth will become a high-density nursery pond, even an ultra-high-density nursery pond. There will be no resources that continue to decompose and transform, no hiding places floating in the shade, and no places for young shrimps to climb and feed. In the low temperature climate, the heat preservation and shading in the pond will be challenged, and the natural barrier for nourishing microorganisms and storing plankton will be lost.
What should I do? Why? Today, we will talk to you about the above problems. Fallacy is inevitable, please criticize and correct me.
If you want to know more about crayfish culture, you can pay attention to SHTXIA or leave a private message. We also welcome your valuable suggestions and provide more knowledge for crayfish farmers. I hope that our efforts will make you less detours and make more money.
What are you going to do after cutting the rice?
1. What are the advantages and disadvantages of rice stubble?
Advantages:
(1) Provide a hidden place for the overwintering shrimps on the beach to improve the survival rate;
(2) keep the water warm and stable;
(3) After harvesting, the roots of rice stubble will turn green again to provide food for lobsters;
(4) The decay of rice stubble releases fertility and cultivates plankton, which is suitable for the growth of shrimp seedlings.
Disadvantages:
(1) The serious rot of rice stubble will affect the substrate environment: the substrate will be rancid, black and smelly;
(2) Too much oxygen-consuming organic matter at the bottom of the pond leads to anoxia at the bottom of the pond, which affects the normal growth and development of shrimp seedlings;
(3) Many toxic and harmful substances will be released after rice stubble rot;
(4) With the increase of temperature, a large number of rice stubbles rot, which leads to the rapid blackening of water bodies, abnormal water quality indicators, inhibition of photosynthesis of aquatic plants, and yellowing and blackening of roots due to lack of oxygen;
(5) Too long rice stubble will weaken the wind speed and wind force and reduce the dissolved oxygen in the pond;
(6) The rice stubble is too long to feed and patrol the pond normally.
Second, how deep is the rice stubble for shrimp culture in rice fields?
Generally, 20 ~ 30 cm rice stubble is left for shrimp culture in rice fields. The rice stubble is too short, and the thermal insulation performance of seedlings going to the seaside in winter is poor;
Too long rice stubble decays slowly, especially above the water surface, which is easy to cause water quality deterioration and blackening;
Too long time leads to no smoke in spring breeding, static water surface, low dissolved oxygen, and cultured moss is not easy to be blown away by the wind;
It is inconvenient to sail on the beach.
It's not too late to harvest rice for shrimp farming in paddy fields. Harvest the rice as soon as possible after it is completely full and mature. At this time, the rice stalks are not completely dry, but can completely turn green and grow green leaves again. These leaves are good bait for shrimp to enter the pond, and at the same time, they can alleviate the deterioration of water quality caused by rice stalk rot and reduce the harm of shrimp seedlings.
Third, shrimp farming in rice fields Does it matter if the water turns red and black after rice harvest? What do you need to do?
After rice harvest, a large number of broken rice stalks and rice stubbles will remain. Once water enters, it will rot in a short time, producing red and black water. The decay of rice straw will produce toxic and harmful substances, and the water body will also be in a sub-anoxic state, which will have a certain impact on prawns. In winter, the temperature is generally low in 65438+February-February, so many algae are difficult to adapt and cannot reproduce as dominant species. The activity of various microorganisms is very low at low temperature, and the rate of decomposing organic matter is very low. Rice stubble in paddy field provides limited fertility in low temperature period; After the temperature rises, the rice stubble rots, the fertility is released, and the water quality is dark.
Rice stalks used for shrimp culture in rice fields can not only fertilize water to produce rich bait, but also release toxins to harm shrimp seedlings when they rot, so making good use of rice stalks to avoid its harm is half the battle.
Rotten rice stalks cause the water to turn red and black. Some people will consider changing the water, which is not a good idea. Most of the water sources for shrimp culture in rice fields are not good, and there is no independent water intake and drainage system, and the water pumped in is not good either. At the same time, it also drains away rich microorganisms and plankton, which is a high-quality bait for shrimp seedlings and the essence of successful shrimp culture in rice fields. If the water quality is left red and black without adjustment and improvement, harmful substances such as hydrogen sulfide released in the process of decay will endanger shrimp seedlings and reduce the survival rate. At the same time, harmful algae such as flagellates can cause frequent hypoxia in water bodies. Therefore, when the straw turns red and black, it is necessary to adjust the water quality. According to the water quality of the pond, we can adjust it by supplementing a large number of beneficial bacteria, so that its fertility can be released slowly and the effect of fertilizing water can be achieved.
Shrimp experts in rice fields said
In the current season, due to the preparation of lobster culture, it is suggested that:
(1) In September and1October, the water level in the ring ditch slowly dropped to the lowest level, 2-3 times, allowing lobsters to dig holes in the ridge;
(2) Do a good job of removing the miscellaneous fish in the ring ditch, then drain the water in the ring ditch as much as possible, and then expose it to the sun for 10- 15 days to crack the ring ditch as much as possible; If the local water is not drained, use "potassium persulfate" to change the bottom;
(3) After the rice is harvested, the bottom is disinfected with quicklime to kill eel, loach, etc. After putting the quicklime into the bottom of the pool, melt the quicklime with 20 cm high water and soak the bottom of the pool, and add water to the depth of 80 cm three days later;
(4) Soak the 80cm water body in the pond for about 7 days, and then inject water again to the highest water level (1.2- 1.5m) to soak the pond and let the female shrimp out of the hole; Draining water after one week, keeping the water level at 60-80 cm, and spraying povidone iodine in sunny morning to disinfect the new water body;
(5) Use "Jiedu 120" and "Water Diversion Jiedu 'an" to remove harmful toxins from water the next day after disinfection; According to the water quality, pour out the "fertilizer paste" and "mushroom factory" microbial preparation fertilizer water. After water fertilization, release shrimp according to the actual situation;
(6) Normal feeding stage. Pay attention to the interval from 10 to 15. In autumn and winter, feed with "shrimp big and strong" and mix well. This can continuously degrade the organic matter in the water, improve the balance of bacteria and algae in the water, and keep the water quality good.
? V. The value of hay powder (shared by netizens)
As a part of crayfish culture in autumn and winter, we observed that the green stems of rice stubble gradually withered in the north wind. Even occasionally in the warm winter sun, we can vaguely hear the crackling of rice stubble on the ridge (you can try to listen). At the moment when it becomes brittle, some powder will fall into the pond, which is the straw powder we choose to replace the high temperature in summer to nourish microorganisms. The most striking example is that the microbial population around each straw is the largest, and crayfish is the most concentrated and grows fastest. Therefore, the withering and brittle cracking of green stubble after pressing can not only supplement the organic matter consumed by straw decomposition. Moreover, the influence of its loose powder on the microorganisms in the pond and the material circulation of the whole pond has been paid more and more attention.
To sum up, combined with the breeding experience of many farmers, we suggest: stubble, less cutting and deep storage, green water, let it slowly and continuously decompose, so that it can continuously provide natural organic matter. Straw can be properly returned to the field because it is cut shallowly and piled small. Do a good job in clearing the pond and threshing ground in advance, disinfect and detoxify in time, nourish bacteria with fertilizer and water, and supplement trace elements with low-temperature continuous fertilizer and water to enhance the self-sustaining immunity of young shrimps and help them resist low-temperature frost. Strive to follow the characteristics of resources and refer to the specific situation of seasonal climate change, formulate scientific plans, take flexible and timely measures, turn waste into treasure, turn straw into natural mine and rice stubble into growing soil, and create an ecologically suitable, resource-rich and natural-friendly living environment for crayfish, which is mainly young shrimp.