INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY

Volume 17, No. 01, Month JANUARY, Year 2021, Pages 325 - 336

Appropriate stocking density for growth of watermeal (wolffia arrhiza) and its efficiency of total ammonia nitrogen removal

Sirirustananun, N. and Jongput, B.

Abstract Download PDF

Watermeal was cultivated at six different stocking densities as 0 (control), 0.5, 1.0, 1.5, 2.0 and 2.5 g fresh weight (fw)•l-1 for two weeks. Results indicated that all watermeal treatments showed optimal growth during the first week. Watermeal cultivated at 2.5 g fw•l-1 revealed the highest growth performance but specific growth rate (SGR) was not significantly differed when compared to the other stocking densities. During the second week, all treatments were recorded as no growth with negative averaged fw gain and SGR. The cultivation of watermeal at 1.5 g fw•l-1 showed significantly higher of total ammonia nitrogen (TAN) removal rate (6.34±0.24 %•day-1•g-1) than watermeal was cultivated at 2.5 g fw•l-1 and the control treatment. The starting stocking density of watermeal at 1.5 g fw•l-1 was determined the most suitable for growth and water quality treatment.

Keywords

Khai-nam, Watermeal, Starting stocking density, Ammonia absorption

---