Spring crab pond how to plant aquatic plants

As the saying goes: “If you want to raise a pond crab, you must first plant a good pond grass.” Tang Yabin, an expert in crab breeding at the Provincial Aquatic Technology Promotion Center, reminded the farmers that spring is coming. By planting water plants, it can regulate the water quality of river crab growth water, strengthen its self-purification capacity, and stabilize water temperature, providing crab habitat shelter, clam shell sites and plant food. The plants suitable for crab farming include Elodea, Hydrilla verticillata and Vallisneria.

One, Elodea

1. Planting time: Elodea is the main aquatic plant in the early stage of crab breeding and its ability to withstand low temperatures is very strong. It should be planted after the crabs are caught and before they are released.

2, planting methods: one is in the dry pond after the use of root transplanting method points, hole distance 1 to 2 meters 1 to 2 meters; the other is to cut grass stems into 15 centimeters in length, 10 or so is a Beam, insert into the mud, 20-25 kg per mu. The required spacing is 5 to 8 meters with other plants in the middle. Planting area accounts for about 30% of the total pond area. After the grass stays alive, gradually add water to submerge the end of the water plant by 10 cm.

Second, the leaves of black algae

1. Planting time: Planting with buds and pods can be carried out every year from December to March of the following year. Breeding with nutrients is generally conducted in April. Planting of the whole plant is best carried out from May to August.

2, planting methods:

(1) Bud planting: Choose sunny day sowing, add 10 cm of fresh water to the pond water before sowing, 1000 g per acre pond, soak in the rows and 50 cm of plant spacing, and insert 3-5 buds into the mud, or Mixed with sand spread. When the water temperature rises to 15°C, germination begins within 5 to 10 days and the emergence rate reaches 95%.

(2) Nutrition and breeding: Generally, before and after the rain, the pond water should be drained, leaving 10-15 cm of sediment, cutting the stem segments of 10 cm of black algae, and spraying 30-50 kilograms per acre evenly to make the stem sections. Partially immersed in mud and then add pond water to 15 cm deep. After about 20 days, the whole pond is covered with new turf black algae, and the water can be added to 30 cm. Afterwards, the pool water is gradually deepened so that water plants will not appear on the water surface.

(3) Whole planting

In May-August each year, the algae in the natural waters have grown up to 40-60 cm long, and each grassy pond has 100-200 kg of grass. The black-leaf hyphorons have adventitious roots, and the roots can be rooted after 3 days of mud formation to form new plants.

Note: The crab is very fond of Hydrilla verticillata. Therefore, before the grass is applied, a polyethylene net sheet and a plastic film are used to make a fence, and the water grass is separated from the river crab to prevent the crab from destroying the aquatic grass in the bud. When the pond is full of ponds, remove the fence facilities and allow the crabs to enter the grass.

Third, hardship grass

1. Planting time: Before and after Qingming.

2. Planting methods: sowing when the water temperature rises above 15°C, plant 100-150 grams of bitter grass seeds per acre. Before the sowing of intensive culture ponds, add 3 to 5 centimeters of fresh water to the pool. The maximum depth is no more than 20 centimeters. Large water surface should be planted in shoals and the water depth should not exceed 1m to ensure that photosynthesis can be carried out. Select sunny days for 1 to 2 days, then soak for 12 hours, and remove the seeds in the fruit. And wash away the mucus from the seeds, then use semi-wet fine soil or fine sand dressing to spread the whole pond. After rubbing the fruit there are still many seeds that have not been picked up and are also thrown into the pool.

Note: Before the grass is applied, the fence is also used to separate the plants from the river crab.