A pot experiment and an irrigated field trial in which the response of sainfoin and lucerne to different levels of P, K and lime was compared, are described. The results of the pot experiment suggested a better response to lime in sainfoin than in lucerne. On the other hand, the P and K requirements of lucerne appeared to be considerably higher than those of sainfoin. Apart from an inconclusive result with regard to the P response, the findings of the field trial, which extended over two seasons, supported those of the pot experiment. The response to P was apparently hampered in this trial by the extremely low K reserve of the particular soil. Lucerne out yielded sainfoin by a wide margin in the field and its crude protein content was considerably higher.'n Potproef en 'n besproeide veldproef waarin dje.reaksie van lusern en sainfoin op toedienings van P, Ken kalk vergelyk is, word gerapporteer. Die resultate van die potproef het gedui op sterker reaksie op kalktoediening by sainfoin as by lusern. Daarenteen is die P-en K-behoeftes van lusern blykbaar heelwat hoik as die van sainfoin. Die veldproef, wat oor twee seisoene gestrek het, het die resultate van die potproef ten opsigte van K-en kalkbehoefte ondersteun, maar daar was geen definitiewe aanduiding wat betref die relatiewe Pvereistes van die twee spesies nie. P-reaksie is skynbaar in die veldproef beperk deur die baie lae K-reserwe in die betrokke grond. Lusern het sainfoin ver oortref in opbrengs in die veldproef en die ruproteieninhoud was ook aansienlik hoik.