Table 16. Pond NPK requirements based on soil pH and texture
pH of pond soil	Soil texture*
	(Heavy loams or clays)
6.5�9	4�8 kg N/ha
	10 kg P2O5/ha
	25 kg 18-46-0**
	50 kg 16-20-0**
	50 kg 16-20-0 +
	15 kg urea***
	1:2 (N:P2O5)
*Texture not specified
** Broadcast on pond bottom during pond preparation for lab-lab growth and on platform every 15�21 days interval; Apply on platform at 2 weeks interval for plankton growth
***Applied every two weeks
Data source: Fortez (1985); Fortez (1996); Bombeo-Tuburan et. al (1989); Boyd and Tucker (1998)