「たばこ」の加里栄養に関する研究(第3報) : 培養液の窒素形態と加里濃度との関係について

抄録

To investigate the effect of nitrogen form and potash levels in culture solution upon the growth, the development of potash deficiency and the ionic absorption in tobacco plant (Bright Yellow variety, Nicotiana tabaccum L.) the sand cultures (table 1,2) with nitrate and ammoniacal nitrogen accompanying several degrees of potash concentration (0〜400 mg. as K_3O) were performed. The results obtained were summarized as follows ; 1) Plant growth was much better in the nitrate than in the ammonium series, and potash deficiency symptoms were observed in all potash treatments within ammonium series, especially severe in a low potash levels (none. 50 mg. as K_2O). 2) Phosphorus and chlorine content of the crop was higher in the ammonium series than in the nitrate series. Conversely, potash, calcium, and magnesium content was higher in the nitrate series, especially remarkable at lower leaves. 3) Interrelation among nitrate, ammonium, potash, calcium, magnesium, phosphorus and chlorine ion in absorption was detected obviously. (table 7,8). 4) The potash content of tobacco plant in both series increased concomitantly but calcium and magnesium content conversely decreased, with increasing addition of potash in culture solution, especially remarkable in upper leaves in all treatments of nitrate series. That is there were interaction among cations. (figure 1,2) Phosphorus content was not affected with increasing of potash concentration in both series, and chlorine content increased in proportion to the increase of potash concentration.