표고톱밥재배시 톱밥의 크기와 첨가제의 혼합 여부에 따른 생산성 차이를 확인하기위해 연구를 수행하였다. 표고균사가 배지 표면에 만연되는데 까지 걸린 시간을 조사한 결과, $CaCO_3$, $KNO_3$을 첨가한 $3{sim}5;mm$ 톱밥 처리구와 $CaCO_3$와 $KNO_3$을 첨가하지 않은 $3{sim}5;mm$ 톱밥 처리구가 가장 빨랐다. 그리고 중량감소율 조사에서는 $CaCO_3$와 $KNO_3$을 첨가하지 않은 1 mm 이하 톱밥 처리구가 가장 높았다. 발생 차수별로 버섯이 발생되는 경향도 처리구에 따라 약간씩 달랐다. $CaCO_3$와 $KNO_3$을 첨가한 1 mm 이하 톱밥 처리구의 경우에는 1, 2차발생에서 수확량의 80% 이상이 생산되었다. 반면에, $CaCO_3$와 $KNO_3$을 첨가하지 않은 1 mm 이하와 $5{sim}7;mm$ 톱밥 혼합 처리구는 1, 2차발생 보다 3, 4차발생에서의 수확량이 더 많았고 1, 2차 발생에서의 수확량이 전체 수확량에서 차지하는 비율은 34%였다. 생산성 조사 결과, 수확량과 버섯개수가 처리구별로 많은 차이를 보였다. 총수확량과 버섯개수가 각각 568 g, 67개였던 $CaCO_3$, $KNO_3$을 첨가한 $3{sim}5;mm$ 톱밥 처리구가 가장 많았으며, 각각 227 g, 24개가 수확된 $CaCO_3$와 $KNO_3$을 첨가하지 않은 1 mm 이하와 $2{sim}3;mm$ 톱밥 혼합 처리구 및 $CaCO_3$와 $KNO_3$을 첨가하지 않은 1 mm 이하와 $5{sim}7;mm$ 톱밥 혼합 처리구가 가장 적었다. 그리고 10 g 이상 되는 버섯의 수확량 조사에서는 $CaCO_3$, $KNO_3$을 첨가한 $3{sim}5;mm$ 톱밥 처리구가 397 g으로 가장 많았다.
Studies were processed to confirm the differences of productivity according to sawdust size and effect of additives for sawdust cultivation of shiitake. In results of investigation until shiitake mycelia fully spread on surface of sawdust medium, mycelial growth in treatment of sawdust size $3{sim}5;mm$ with $CaCO_3$ and $KNO_3$, and treatment of sawdust sizw $3{sim}5;mm$ without $CaCO_3$ and $KNO_3$ was the fastest. And, in investigation of rate of weight reduction, treatment of sawdust size below 1 mm without $CaCO_3$ and $KNO_3$ was the highest. The tendency of fruiting was somewhat different according to treatments. In case of sawdust size below 1 mm with $CaCO_3$ and $KNO_3$, yield produced from 1st to 2nd flushing period was over 80%. However, in case of sawdust size below 1 mm plus $5{sim}7;mm$ without $CaCO_3$ and $KNO_3$, yield produced from 3rd to 4th flushing period was more than it from 1st to 2nd flushing period and rate of yield produced from 1st to 2nd flushing period to total yield was 34%. Results of investigation on productivity, yield and the number of fruit-bodies were remarkably different according to treatments. Sawdust size $3{sim}5;mm$ with $CaCO_3$ and $KNO_3$, whose total yield and the number of fruit-bodies were 568 g and 67, respectively, was the highest. And, total yield of medium of sawdust size below 1 mm plus $2{sim}3;mm$ without $CaCO_3$ and $KNO_3$ was lowest as 227 g and the number of fruit-bodies of medium of sawdust size below 1 mm plus $5{sim}7;mm$ without $CaCO_3$ and $KNO_3$ was lowest as 24. In investigation on amount of fruit-bodies over 10 g, medium of sawdust size $3{sim}5;mm$ with $CaCO_3$ and $KNO_3$ was highest as 397 g.
