TAILIEUCHUNG - Changes in nitrogen status of soybean under influence of symbiotically fixed and bound nitrogen
The contribution of different nitrogen sources (nitrate 15N-NO3 and symbiotic N-N2) to the nitrogen status of soybean in ontogenesis was studied. Nitrate was assimilated effectively during the vegetative growth, whereas later on the nitrogen-fixation by root nodules became the basic source of nitrogen. | Tr. J. of Agriculture and Forestry 23 (1999) 389-392 © TÜBİTAK Changes in Nitrogen Status of Soybean Under Influence of Symbiotically Fixed and Bound Nitrogen . GADİMOV, . SAFARALİEV Institute of Botany, Azerbaijan Academy of Sciences, Patamdart Sh. 40, 370073 Baku, AZERBAİJAN . TROİTSKAYA Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaia 35, 127106 Moscow, RUSSİA . ALLAHVERDİEV, S. NAFİSİ Zonguldak Karaelmas University, Faculty of Forestry, 74100 Bartın-TURKEY Received: Abstract: The contribution of different nitrogen sources (nitrate 15 N-NO3 and symbiotic N-N2) to the nitrogen status of soybean in ontogenesis was studied. Nitrate was assimilated effectively during the vegetative growth, whereas later on the nitrogen-fixation by root nodules became the basic source of nitrogen. The applying of a low dose of nitrate ( mg N/plant) increased the total nitrogen content in the plant and did not depress the nitrogen fixation. Distribution of the symbiotic and nitrate nitrogen among organs of soybean was proportional. Simbiyotik Fikse Edilmiş Azotun ve Nitrat Dozlarının Soyanın Statüsünün Değişimindeki Etkileri Özet: Bu çalışmada, farklı azot kaynaklarının (nitrat 15 N-NO3 ve simbiyotik N-N2) ve ontogenesisteki soyanın azot konumunun bağlantısı araştırılmıştır. Büyüme döneminde nitrat belirgin bir şekilde emilmiş, daha sonra, köklerin nodulleri tarafından fikse edilmiş azot, azotun ana kaynağı olmuştur. Azotun düşük dozda (bir bitkide mg azot) uygulanmasında, bitkinin toplam azot miktarı yükselmiş ve azot fiksasyonu düşmemiştir. Soya bitkisinin organlarında simbiyotik ve nitrat azotun dağılımı, dengeli karakterli olduğu gösterilmiştir. Introduction The leguminous plants acquire the ability to assimilate free nitrogen after the formation of root nodules. However, they can also make use of the bound forms of nitrogen-bearing compounds, . ammonia salts, nitrate, etc. (1). The main role in the establishment
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