Alkaline soil treatment shrimp ponds


     The mineral composition of the pond water is largely a reflection of the composition of the soil minerals at the bottom of the pond. The soil colloidal components containing humus and clay are powerful adsorbents for soluble mineral nutrients and dominate their availability; pond soil is decomposed Organic matter and the microbial survival of the chemical elements of the medium; the pond soil or the source of the bait bait.

          If the pond is a teapot, the bottom of the pond is the tea, only a good tea, in order to soak good tea. Similarly, want to have a pond of good water, handle the bottom of the pond soil is the key. And production we often ignore the pond alkalization treatment, and now we will briefly introduce the pond alkalization treatment method:

          Shrimp culture ponds, the total alkalinity and total hardness must be more than 50 mg / l in order to have sufficient buffer capacity and to ensure that the shrimp normal shelling, soil pH should be maintained at between 6 to 9.5, in order to provide enough to dissolve the carbon dioxide To ensure that algae grow well. In the pond, the alkalinity requirement can be easily determined by water quality analysis. Never pour water in the new pond, when the soil pH <6.5 and low water alkalinity, we must alkalize the bottom of the pond soil.

          The new pond alkaloid uses a sampler to take a 15 cm deep soil sample from the bottom of the pond and measure the pH. If the pH is below 7, the alkalinity requirement is determined. According to the required dose, the lime evenly sowing in the bottom of the pond, with a cultivator or disc rake plowing 10 to 15 cm deep, the lime mixed into the soil, but can not use plow.

          Old pond alkalinity If the total alkalinity of the fish is less than 20 mg / l or shrimp ponds below 50 mg / l, the pond must be sampled to determine the alkalinity requirement. The total amount of pond lime is calculated based on the average requirement of several soil samples at the bottom of the pond. Can be visualized by the bottom of the pool is divided into 1 meter deep and below the area, the application of lime, the deep water area than the shallow weight of 2 to 3 times. For ponds with a depth of less than 1 meter, the lime spreads evenly over the bottom of the pond. When the pond soil is dry enough to be plowed, the lime must be mixed into a 10 to 15 cm soil surface using a cultivator or disc rake. The amount of lime can be simply measured based on the pH of the soil

          Excessive use of lime will cause shrimp ponds strong alkaline, so that ammonia toxicity increased, lack of phosphorus, shrimp difficult to raise.

          Acid sulphate ponds In China's coastal areas, especially in Guangdong, there are many ponds built on mangrove areas, mangrove soil is acidic sulphate soil, because the acidic sulphate pond soil acidity is too high, the use of lime to deal with very Difficult to achieve the purpose of pH adjustment, so the treatment of such ponds should take a special approach.

          The identification of acid sulphate soils can be identified by the high sulfur content (> 0.75%) or low pH (2 ~ 3) in the pond soil after several days of drying. The identification of wild acid sulphate soil was carried out by mixing a few grams of fresh soil with 10% to 30% hydrogen peroxide (H2O2). After about 10 minutes, a broad spectrum of pH test paper was placed in the soil and hydrogen peroxide mixture (0 ~ 6), insert the end of the pH test strip into the edge of the mixture and allow the liquid to climb along the indicated note. If the indicated color change indicates that the pH is not greater than 3, the soil is an acidic sulphate soil, which has a large amount of ash Yellow spots, drained water where the soil surface is red. Alkalization of Acid Sulfate Soil

          Step 1, in the early dry season, the bottom of the pond thoroughly dry and plowed;

          Step 2, pour the brackish water, often determine the pH value of water, the pH value from the sea water (7 ~ 9) down to 4 below, when the pH once stable, the pond drained. Repeat this process until the pH is stable above 5. This often takes three more rows, filling the cycle.

          Step 3, the bottom of the bottom of the same time, must remove the acidity of the surrounding shore dam, in order to achieve this purpose, the top of the embankment level, along the edge of the embankment to build a small embankment to form a shallow pool, filled with brackish water. When the pond drainage is dry, also the banks of the pool of water drained off, if necessary, repeat. Finally, clear the small embankment, in the embankment on the top and side by 0.5 to 1.0 kg / square meter lime.

          Step 4, once the final row, irrigation cycle is completed, pond at the end of 30 to 40 kg / acre lime, according to the need for fertilization to promote phytoplankton breeding. Step 5, in order to prevent diarrhea embankment, to always detect pH, if necessary, alkalization and film slope protection.