Nucheen, P., & Ratananukul, S. (1992). Effects of Nitrogen, Phosphorus and Potassium Fertilizer on Yield an dQuality of Asparagus (Asparagus officinalis) . Thai Agricultural Research Journal, 10(1), 9. retrieved from https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/241623