
ABSTRACT An experiment of the effect of dose and application time of potassium on yield of sweet potato (Ipomoea batatas (L) Lamb.), had been done since October 11th, 2002 until January 30th 2003 at BPP Mungkid Progowati Village, Mungkid District, Magelang Regency, kind of soil is regosol, pH is 6,8 and the altitude is 295 meters. The experiment method is factorial exper…