@book{10111,
	author = {Sapngad, Johnny I. },
	title = {Growth and yield performance of sweet potato (PSB SP 15) applied with different NPK levels under San Manuel soil series},
	year = {2004},
	note = {Thesis (BS Agriculture-Soil Science) -- Mariano Marcos State University-College of Agriculture, Food & Sustainable Development, Batac City }
}