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Dry soil ploughing except in trenches –West Godavari districtPloughing on dry soil using tractorPloughing on wet soil using tillerPloughing on dry soil and subsequent wetting of bottom3.2.2.3. LimingLiming during pond preparation optimizes pH and alkalinity conditions of soil and water. The typeand amount of lime to be added depends mainly on the soil pH and also on pond water pH, whichideally should be checked before lime application. The recommended levels of lime applicationduring pond preparation are given in Table 1. The soil pH can either be measured with a soil pHmeter or by air drying some soil and adding it to an equal weight of distilled water. The soil andwater should be thoroughly mixed and left overnight before measuring the pH of the water (pHindicator solution or pH papers is sufficient).Quick lime or hydrated lime should be used only if the soil pH is low i.e. pH 5, then it may increase the water pH after filling and this high water pH condition mayremain for a prolonged period even after stocking, which is not desirable. If the soil pH is more than5, then shell lime or agricultural lime or dolomite should be applied.If the soil does not contain acid sulfate (orange color), apply shell lime or agricultural lime evenlyon the bottom surface and also on slopes of bunds before water is added to each pond. In case ofacid sulfate soil, do not apply lime directly into the soil. The pond should be filled with water andthen lime should be applied to increase the pH up to 7. Where a disinfectant like bleach (calciumhypochlorite) is used then apply lime only 3-4 days after the application of disinfectant. If lime isused earlier to disinfect, then the effectiveness of the disinfectant is reduced.10
Table 1. Recommended lime application during pond preparationSoil pH Quantity of CaCO 3Quantity of Ca(OH) 2limelime (Kg/hectare)(Kg/hectare)> 6
Page 6: ForewordShrimp Aquaculture has prov
Page 10 and 11: AcknowledgementsThe MPEDA and NACA
Page 12 and 13: principles and practices mentioned
Page 14 and 15: Shrimps with loose shell syndromeHi
Page 17 and 18: 3. SHRIMP HEALTH MANAGEMENT GUIDELI
Page 19: Sludge on pond bottom (indicated by
Page 23 and 24: 3.3.2.2. Fertilization of waterThe
Page 25 and 26: Fast transportation of seed using p
Page 27 and 28: The study showed significant relati
Page 29 and 30: Aeration of water using a paddle wh
Page 31 and 32: Demand feeding using check traysFee
Page 33 and 34: 4. SHRIMP HEALTH MONITORINGShrimps
Page 35 and 36: wwwThe pond water should be treated
Page 37 and 38: 7. FARMER ORGANIZATIONIt is very im
Page 39 and 40: Annex A: Some frequently asked ques
Page 41 and 42: pond, which may help in reducing th
Page 43: Annex B: Crop detail and pond manag
Page 46: Harvest details:Date of harvest:

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