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VERMICOMPOST TEA: EFFECTS ON PAK CHOI (BRASSICA RAPA CV .
BONSAI, CHINENSIS GROUP) GROWTH AND YIELD, PHYTONUTRIENT CONTENT AND SOIL BIOLOGICAL PROPERTIES

A DISSERTATION SUBMITTED TO THE GRADUATE DIVISION OF THE
UNIVERSITY OF HAWAI’I IN PARTIAL FULFILLMENT OF THE
REQUIREMENTS FOR THE DEGREE OF

DOCTOR OF PHILOSOPHY

IN
TROPICAL PLANT AND SOIL SCIENCES

AUGUST 2011
By
Archana P. Pant

Dissertation Committee:
Theodore J. K. Radovich, Co-Chair
Nguyen V. Hue, Co-Chair
Robert E. Paull
Susan C. Miyasaka
Norman Q. Arancon
Brent S. Sipesi

ACKNOWLEDGMENTS

I wish to thank my Co-Advisors, Dr. Theodore J. K. Radovichand Dr. Nguyen V. Hue, for their guidance, encouragement, and continuous support throughout my graduate program. I am grateful to my dissertation committee members; Dr. Robert E. Paull, Dr. Susan C. Miyasaka,Dr. Norman Q. Arancon and Dr. Brent S. Sipes for their intellectual comments, suggestions and encouragements. This research was supported by grants from the Western Sustainable Agriculture Research and Education (WSARE)and the Tropical and Subtropical Agriculture Research (TSTAR) Programs of the USDA.I appreciate the services provided by Waikiki Worm Company, HI, the Agricultural Diagnostic Service Center, University of Hawaii, Microbial Matrix Systems, OR, and the National Research Council, Saskatoon, Canada. I would like to thank Dr. Teresita Amore, Dr. J. P. Bingham and Dr. Travis Idol for granting me access to their laboratories and equipment at the University of Hawaii. I would like to express my sincere gratitude to Dr. Halina M. Zaleski for answering my queries on statistical analysis. I would also like to take this opportunity to thank Dr. Stephen T. Talcott, Texas A & M University, for helping me on analyzing phytonutrients at the beginning of my study. My sincere appreciation goes to my laboratory colleagues and friends, and the Tropical Plant and Soil Sciences faculty and staff who are too many to mention but have contributed in several ways to my research and graduate experience .iii I greatly appreciate love and encouragements of my family. These words would never have been written withoutthe loving support and constant company of my husband, Pradip Raj Pant. I would like to thank ourdaughter, Preetha, for her patience and giving me strength to persist. To Buwa, Ama, Didi and my in-laws, your love and support have provided me with strength and inspiration in this very memorable journey. iv ABSTRACT

Vermicompost tea, an aqueous extract of vermicompost has been reported to improve plant health, yield and nutritional quality. Most of the previous researches on compost tea have investigated the potential of compost tea for control of plant disease. Only limited data exists on the use of vermicompost tea for improvingthe yield andnutritional quality of vegetable crops and altering soil biological properties. Therefore, laboratory, greenhouse and field experiments were conducted in order to identify and describe: 1) the effects of vermicompost tea extraction methods [(i) non-aerated(NCT), (ii) aerated(ACT),and(iii)aerated with additives(ACTME)], 2 fertilizers (Osmocote and vermicompost), and three growth media (Oxisol, Mollisoland a peat-perlite medium) on yield and nutritional quality of pak choi (Brassica rapa, Chinensis)as well as soil biological properties; 2) the effects of the ratio of vermicompost to water and different fertilizers on yield and nutritional quality of pak choi as well as soil biological properties;3) the effect of compost quality on biochemical properties of compost tea; and 4) mechanisms involved in the effects of compost tea on plant growth. The result showed that applications of vermicompost tea, regardless of extraction method, increased plant yield, mineral nutrients, phytonutrient content of pak choi; and microbial activities of an Oxisol, a Mollisol or a peat-perlite medium and this effect was most prominent under organic fertilization. This finding
Suggests that vermicompost tea serves both as a supplemental source of plant nutrients and an enhancer of soil biological properties .Similarly, application of vermicompost tea with vermicompost to water ratios of 1:10 -1:100(v:v) increased yield, total carotenoids,

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