Abstract
1. A field trial was conducted in order to find out how far seed yield of orchardgrass would be influenced by such management as plant density, manuring, etc. 2. As for methods of cultivation, it was demonstrated that interaction between methods of plant density was significant both in the first harvest year and in two year's comprehensive result ; namely, in the case of "sown in situ", more seed yield was obtained in low density than in high density and vice versa in the case of transplanting. 3. As for manuring, the positive effect of manuring was detected all through the two year period. It was considered that increased number of fertile tillers by heavy manuring was responsible for the high seed yield. 4. In comparison of methods of planting, higher seed yield was obtained in transplanting than in "sown in situ". Interaction was detected, however, between years ; namely, the second harvest year outyielded the first one in "sown in situ" and vice versa in transplanting. 5. Analysed into several components of seed yield such as number of fertile tillers, number of seeds per panicle and seed weight, it was considered that increased seed weight was most responsible for the higher seed yield of the first harvest year, that manuring stimulated the increase of number of fertile tillers and that increased number of fertile tillers and that of seeds per panicle of the transplanted could surpass those of the 'sown in situ' in seed yield.
