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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์


ผู้เขียน:Imgดร.นวลฉวี รุ่งธนเกียรติ, ศาสตราจารย์, ImgAreerat Kornduangkaeo, ImgVaravuth Kajornrith, ImgChutima Kranrod



Chiang Mai 60, SJ 5, and Doi Kham soybean varieties were grown in pots and fertilized with 0, 20, 40 kg N/ha. It was found that these 3 soybean varieties gave higher seed yield with increasing of N fertilizer. The harvested seeds then were analyzed for nitrogen content using nuclear technique (neutron activation) and standard chemical analysis. For neutron activation analysis, seeds were irradiated with fast neutron at the flux of 2.5?1011 from Thai Research Reactor, TRIGA Mark 3 type, at the Office of Atomic Energy for Peace. The emitted gamma rays of 0.511 MeV from 13N of nuclear reaction 14N(n,2n)13N caused by the annihilation of positron disintegrated were measured by the semiconductor detector (HPGe). Ammonium nitrate was used as standard and the interfering activities induced by phosphorus and potassium and from recoil proton were also corrected. From qualitative analysis using neutron activation, N, P, K, Mn, Mg, Ar, and Al were found in the soybean seed. The average nitrogen contents in soybean are 7.024% and 6.809% as determined by nuclear technique and by chemical method, respectively. The results from these two methods of analysis were considerably comparable.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 033, Issue 3, Jul 99 - Sep 99, Page 335 - 342 |  PDF |  Page