Text | Central China Zhang Huijie
According to the current aquaculture analysis, the production of shrimp above the size of Zhongdaqing is reduced, and the price rebound in the later period will be faster than that in 2021-2023. Therefore, if there are aquatic weeds at present, the breeding benefits in the later stage are very considerable.
1. Grass preservation is the only option
Aquatic weeds have many functions, but the most important role of aquatic weeds at present is to extend the breeding cycle. The more sluggish the market in the early stage, the higher the proportion of benefits in the later stage. Therefore, in order to improve the efficiency at present, grass preservation is the only choice. As shown in Figure 1.
Fig. 1 The proportion of benefits of ordinary households and high-quality households around May 15
2. Current status of aquatic weeds: 70% have problems
From May 10th to 12th, we visited Qianjiang, Jianli, Gong'an and other core rice and shrimp breeding areas, and found that the proportion of aquatic weeds was less than 30%, and more than 70% of aquatic weeds had problems. As shown in Figure 2.
Fig.2 Status of aquatic weeds in the core area of rice and shrimp
3. The principle of grass preservation: light and dissolved oxygen
A small water experiment, divided into three groups, to verify what exactly is needed for the growth of aquatic plants?
01 Experimental background
Six mineral water bottles were used, divided into 3 groups, namely light aerobic group, light anaerobic group and light aerobic group, and the aquatic plants cut in the same shrimp pond were put into the same shrimp pond to verify the effects of light and dissolved oxygen on aquatic plants. As shown in Figure 3.
Figure 3 The initial state of the three groups
02 Experimental process
In the three experimental groups, the same grass fertilizer was put into each of the three experimental groups, the light aerobic group was directly placed on the window sill, the light anaerobic group added reducing agent and capped the bottle cap and placed it on the window sill, and the light aerobic group was placed in the cabinet without the bottle cap, and then took root with the aquatic plants. Figure 4.
Fig.4 The status of the three groups on the second day
03 Experimental results
The light aerobic group had roots on the 3rd day, and the light anaerobic group and the light aerobic group still had no roots after 5 days. As shown in Figure 5.
Fig.5 Status of the three groups on day 3
Summary: Aquatic plants need light and dissolved oxygen to grow.
4. Verification of the pond mouth of the grass preservation scheme
Three shrimp ponds with similar growth states of aquatic weeds and undefeated were screened, which were Haida plan that has been used, Haida plan that has not been used first, and Haida plan that has not been used.
04 The comparison between what has been used and what has not been used
The shrimp pond aquatic weeds that use the Haida program continue to have white roots, and the shrimp pond aquatic weeds that do not use the Haida program first produce yellow roots, then black roots, and finally directly bleach, announcing the end of breeding. As shown in Figure 6.
Fig.6 Status of aquatic weeds with and without the Haida scheme
05 Comparison of first use and then use
Before use, the aquatic plants have no white roots and yellow roots, and there are also black roots; After use, the black root decreases, the yellow root increases at first, and finally the white root increases. Figure 7.
Fig.7 Aquatic weeds before, during and after use and non-use
Summary: Haid's plan can protect the grass.
5. Grass conservation operation standards for different aquatic weeds
Based on the current situation of aquatic weeds, different aquatic weeds are treated according to different schemes, which has better effects and saves costs, as shown in the following table.
6 Conclusion
At present, it is the middle of May, the time to plant rice can be in late June, the normal breeding time is still 30 days, if the density is appropriate, the aquatic grass is good, 30 days can breed a season of crayfish with a yield of more than 200 catties per mu.
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