 หัวเรื่อง:การศึกษาพฤติกรรมของไรโซเบียมในดินที่มีความชื้นต่ำ ผู้เขียน: Thianchai Arayangkoon, Preecha Wadisirisuk, Wiroj Wajananawat, Witaya Thananusont สื่อสิ่งพิมพ์:pdf AbstractSoybean seeds (8 kg.rai superscript -1, rate) inoculated with Bradyrhizobium japonicum (200 g. peat carrier, 7.80 x 10 superscript 8 cell g. superscript -1, peat) were sown in hot (42-45 degree C), dry (2-4% by weight) soils, at 0, 1, 3, 5, 7 and 10 days in January, 1987 and 0, 10, 15 and 20 days in February, 1988, before the first irrigation. The survival of inoculated rhizobia as estimated by YMA-plate count, showed that the number decreased every day after seed sowing but the survival was not less than 1.00 x 10 superscript 5 cell seed superscript -1 even in 20 days treatment. It was also found that N subscript 2 – fixation activity by ARA method and nodule dry weight did not too much decreased. Furthermore, the recovery of inoculated rhizobia as evaluated by fluorescent antibody technique was found in very high number over the un-inoculated plot. It could be recommended that soybean inoculated with Bradyrhizobium japonicum in dry soil under rain-fed area was able to survive at adequate number for increasing soybean yield. |