Associative N_2-Fixation in Pearl Millet and Sorghum : Levels and Response to Inoculation
スポンサーリンク
概要
- 論文の詳細を見る
A study was conducted to assess the agronomic importance of associative N_2-fixation in pearl millet (Pennisetum glaucum (L.) R. Br.) and sorghum (Sorghum bicolor (L.) Moench). To achieve this objective, the rate of N_2-fixing activity was measured by comparing the magnitude of N_2-fixation between pearl millet or sorghum, and pigeonpea (Cajanus cajan (L.) Millsp), chickpea (Cicer arietinum L.), or groundnut (Arachis hypogaea L.) and by examining the response of the crops to inoculation with N_2-fixing bacteria. The overall mean nitrogenase activity (C_2H_2 reduction) in pearl millet throughout the growing period was less than 0.1% of that in pigeonpea and the activity in sorghum was only 1.3% of that in chickpea. Whether assessed by the determination of the nitrogen (N) balance in pots, using pigeonpea as reference, or by the measurement of the natural abundance of ^<15>N (δ^<15>N) using groundnut as reference, N gain by these cereals, even when they were inoculated with N_2-fixing bacteria was not observed. Inoculation trials were conducted in pots and in the field with Azospirillum lipoferum and Azotobacter chroococcum. Only one trial with sterilized soil in pot showed a significant response to inoculation. The results obtained indicate that associative N_2-fixing systems in pearl millet and sorghum do not exert an agronomically significant impact through N input on the production of these crops at present.
- 社団法人日本土壌肥料学会の論文
著者
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Yoneyama Tadakatsu
National Agriculture Research Center
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Lee K‐k
International Crops Research Institute For The Semi-arid Tropics (icrisat) Asia Center
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Wani Suhas
International Crops Research Institute For The Semi-arid Tropics (icrisat) Asia Center
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Yoneyama Tadakatsu
National Agricultural Research Center For Tohoku Region
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Lee Keuk-Ki
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) Asia Center
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Trimurtulu Nunna
Agricultural Research Station, Andhra Pradesh Agricultural University
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Trimurtulu Nunna
International Crops Research Institute for the Semi-Arid Tropics (ICRlSAT)
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Harikrishnan Rarnasubramani
International Crops Research Institute for the Semi-Arid Tropics (ICRlSAT)
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Trimurtulu Nunna
Agricultural Research Station Andhra Pradesh Agricultural University
関連論文
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