<論文>ホウレンソウ内硝酸イオン濃度の低減に対する竹パウダーの効果

Abstract

In this study, for efficient use of bamboo resource, we focused on an agricultural method that uses bamboo powder. In particular, we evaluated the effect of decreasing nitrate ion content in spinach. The results obtained were as follows. Firstly, by plowing bamboo powder into the soil, we found that the spinach grew larger; moreover, there was a decrease in the nitrate ion content in spinach. This effect was achieved by maintaining the roof floor temperature higher than the ground temperature. However, increased fertilizer-application rate negatively affected spinach growth, but the nitrate ion content in spinach continued to decrease. Secondly, the soil temperature was almost the same at ground cultivation, but the temperature of soil plowed with bamboo powder was higher than that without bamboo powder. These results suggested that fermentation by lactic acid bacteria was actively carried out by maintaining the cultivation temperature higher, such as that of the roof floor. Finally, there was no difference in the soil nitrogen content after harvest regardless of the presence of bamboo powder. The results indicate a possibility that the nitrate ion content in spinach can be decreased by using bamboo powder, besides regulating the soil nitrogen content.