藁灰処理が小麦苗の発根を促進させる機構に就て

抄録

The nursery of wheat was supplied with the solution of straw-ash 15 days, 10 days or 5 days before transplanting, respectively. At each time, 9 l of the solution containing 188 g of the material were used per tsubo (3.306 m²). The root-formation after transplanting was proved, as a rule, better in each plot treated with straw-ash than in the control (only the pure water was supplied) and best uhen supplied with the solution 5 days before transplanting. On the other hand, the analysis of the chemical constituents shows that the seedlings which have been treated with straw-ash solution are rich in sucrose and poor in starch comparing with those treated with pure water and moreover those treated with the solution 5 days before planting are richest in sucrose. Basing on these data, it may be assumed that the potassium of straw-ash absorbed in the plants may convert starch into sucrose which hastens the root-formation together with the other materials (auxins, some nitrogenous substances, etc.) Anyhow, it may be duly suggested that suppling some amounts of straw-ash or potassium to wheat seedlings a few days before transplanting hastens the root-formation which favours their subsequent growth on the field.