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- Kualltas Air Dan Tanah Tambak Udang Yang Mendapat Perlakuan...
Kualltas Air Dan Tanah Tambak Udang Yang Mendapat Perlakuan Pengerlngan Dan Aerasi Setelah Penggenangan
Abstract:
A greenhouse experiment using plastic vessels was conducted at the Soil Science Laboratory, Faculty of Agriculture, Gadjah Mada University. It evaluated the water and soil quality of the pond that were subjected to drying and aeration after inundation, to find out which drying and aeration treatments were the best for shrimp culture. The soil quality was observed during drying treatment and after inundation, while the water quality was observed after inundation. The soil used was obtained from an intensive shrimp pond, while the sea water was collected from Jepara coast. The wet soil was taken from the pond's bottom, at 0-25 cm depth.
The experiment used the factorial completely randomized design (FCRD) with two factors, namely: soil drying treatments, which consisted of drying the wet soil under the sun, and air and field capacity conditions and water saturated condition. Both the soil drying and aeration treatments were carried out for 64 days each. There were a total of eight treatments with two replications for each treatment.
The physical and chemical properties of the soil and water were observed. The data obtained were subjected to Duncan's Multiple Range Test (DMRT) at five percent level of significance. The soil used had a high organic matter content (6.44%) moderate total N content (0.26%), moderate C/N ratio (12.8:1), a very high NHJ content (7.34 mg kg-1, a low NO2 content (0.12 mg kg-1), and a very high H2S content (3 .56 mg kg-1). The soil belonged to the Order Entisol, Suborder Aquent, Great Group Fluvaquent, and Subgroup Tropic Fluvaquent.
During drying, the organic matter content was slowest in the field capacity soil, followed by the air-dried soil and the water-saturated soil. Soil drying decreased the pH and evaporated the NH3 such that its solubility and content decreased. On the other hand, decreasing the soil pH increased the solubility and content of H2S. Soil drying increased redox potential, such that the NO2 content increased. During drying and after inundation, the soil sti ll had a high potency to release NH3, N02, and H2S.
Evaluation of the physical and chemical properties of the water for shrimp culture suitability showed that the water at the vessels bottom was still suitable 64 days after inundation. Air-dried soil and field capacity soil were both found suitable 4-20 days after inundation. The NH3 content of the water in both treatments was always low. The inundated air-dried soil (with or wihout aeration) were found unsuitable for shrimp culture.