^<15>N利用による米ぬか窒素吸収の作物間比較 : 有機態窒素の吸収および吸収機構の作物間比較(第2報)

概要

論文の詳細を見る
Previously, we showed results that upland rice (Oryza sativa L.) had a higher response to organic nitrogen applied as rice bran than maize (Zea mays L.). We proposed three hypotheses for the results. Firstly, rice has a greater ability to compete with microorganisms for inorganic nitrogen. Secondly, rice is superior in the uptake of ammonium, amino acids and peptides. Thirdly, the mineralization in the rice root zone occurs more actively as compared to other crops. We conducted pot trials in which upland rice, maize and soybean (Glycine max Merr.) were cultivated with ^<15>N-labelled rice bran. The crop and soil were taken for N and ^<15>N analysis at three stages. The total nitrogen in the plants and inorganic nitrogen in the soils were determined by a calorimetric method, and followed by Kjeldahl digestion and KCl extraction, respectively. The ^<15>N was measured by the emission spectrometric method. The ^<15>N concentration of the rice plant was higher than other crops. This suggests that rice is more liable to take up nitrogen such as ammonium, amino acids and peptides rather than nitrate, which is accumulated in the soil and subsequently reduces the ^<15>N concentration in plants. The ^<15>N concentration of inorganic nitrogen in the cultivated soil was higher than that in the fallow. This suggests that the mineralization of organic nitrogen in accelerated by cultivation, but no differences among the crops studied were observed. Consequently, the second hypothesis is supported by these results, while the third in not.
社団法人日本土壌肥料学会の論文
1997-06-05

^<15>N利用による米ぬか窒素吸収の作物間比較 : 有機態窒素の吸収および吸収機構の作物間比較(第2報)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク