TY  - BOOK
AU  - Sapngad, Johnny I. 
TI  - Growth and yield performance of sweet potato (PSB SP 15) applied with different NPK levels under San Manuel soil series
PY  - 2004///
N1  - Thesis (BS Agriculture-Soil Science) -- Mariano Marcos State University-College of Agriculture, Food & Sustainable Development, Batac City; Bibliography: leaves 29-30
ER  -