منابع مشابه
Occurrence of Azotobacter Spp. in Some Polish Soils
In the year 2000 the occurrence of Azotobacter spp. in 31 Polish soils was examined and results of this study were compared with those published by Ziemięcka for 28 soils analysed in 1917-18. Almost 52% of the soils tested in 2000 were colonised by Azotobacter spp. indicating that intensification of agricultural practices that took place during the past century has not significantly changed (50...
متن کاملCharacterization of free nitrogen fixing bacteria of the genus Azotobacter in organic vegetable-grown Colombian soils
With the purpose of isolating and characterizing free nitrogen fixing bacteria (FNFB) of the genus Azotobacter, soil samples were collected randomly from different vegetable organic cultures with neutral pH in different zones of Boyacá-Colombia. Isolations were done in selective free nitrogen Ashby-Sucrose agar obtaining a recovery of 40%. Twenty four isolates were evaluated for colony and cell...
متن کاملOccurrence, Characteristics, and Genetic Diversity of Azotobacter chroococcum in Various Soils of Southern Poland
The presence of Azotobacter sp. in soils has beneficial effects on plants, but the abundance of these bacteria is related to many factors, especially soil pH and fertility. The presented study evaluated the abundance of Azotobacter sp. in various soils of southern Poland and confirmed the relationship between soil properties and the presence of these bacteria. Diagnostic tests indicate that all...
متن کاملThe action of 2,4-D upon the Azotobacter of some sugarcane soils.
The value of 2 ,4-dichlorophenoxyacetic acid (2,4-1)) and its various formulations as phytotoxic agents has been predicated upon their toxicity to the unwanted weeds in relation to their toxicity to the wanted crop plants; but this evaluation is based on only a part of the farmers' plants. No one questions the beneficial roles played by many of the bacteria, actinomycetes, and fungi, the micros...
متن کاملPGP potential, abiotic stress tolerance and antifungal activity of Azotobacter strains isolated from paddy soils.
Azotobacter strains were isolated by serial dilution method and colonies were viscous, smooth, glistening, and brown to black colour on Jenson's N-free agar. Morphological and biochemical tests showed characteristic features of Azotobacter. Further, molecular analyses revealed the presence of different Azotobacter species viz., A. armeniacus, A. chroococcum, A. salinestris, A. tropicalis and A....
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science
سال: 1922
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.56.1436.21