I would like to express my sincere thanks to my research advisor, Dr. Pablito M. Magdalita for him invaluable help and constant encouragement throughout the course of this research. I am most grateful for him teaching and advice, not only the research methodologies but also many other methodologies in life. I would not have achieved this far and this research would not have been completed without all the support that I have always received from him. and Mr. Marcelino T. Gregorio for providing the supplies and materials and other assistance during the greenhouses experiments.