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48211815top'ht.mIrish ForestryIIIIffIfIII24/1---___ -;16/ I.1296II/""",-r.-/,/'"6/ / 12 survey data YC [estJ./ 12 BFC [19711 YC1020 30 40age yrsFig. 4. Height/age categories of unthinned Sitka spruce for yield classesdefined by volume production per annum at any age.DISCUSSION ON YIELD AND PRODUCTIVITY CLASSESThe productivity classes which have been calculated representa wider range of production for top height, especially in youngcrops that has heretofore, been realised in this country. Patternsfor unthinned stands are not quite the same as shown by Hamiltonand Christie (1971) for thinned stands. In figure 5 production