Effect of soybean inoculation with<i>Bradyrhizobium</i>and wheat inoculation with<i>Azotobacter</i>on their productivity and N turnover in a Vertisol

Rawat, Anurag; Rao, D. L. N.; Sahu, R. K.

doi:10.1080/03650340.2012.740555

Cited by 16 publications

(15 citation statements)

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“…The total benefit to crops and soil due to the inoculants was 73.8 kg N ha -1 yr -1 after one soybean-wheat rotation [36]. This underscored the need to promote awareness for adoption of integrated approach in nutrient management along with use of good quality rhizobial inoculants to promote BNF.…”

Section: Rhizobium and Pgpr Inoculationmentioning

confidence: 97%

Section: Heterotrophic N Fixationmentioning

confidence: 99%

“…The rotational benefit of legumes and N credit for succeeding cereal crops are widely known. Recent reports on effects of Rhizobium inoculated soybean and Azotobacter inoculated wheat in a Vertisol showed a fertilizer-nitrogen saving of 30 kg ha -1 in wheat [36]. …”

Section: Green Manuring and Residual N Benefitsmentioning

confidence: 99%

“…But the huge amounts of tap water used for irrigation could contribute up to 20-30 kg N ha -1 y -1 of unlabelled N [35]. Recent data from a long term experiment in Vertisols for 8 years showed N-accumulation of 5.4 kg/ha/crop season in wheat in 0-15 cm soil that was attributed to non-symbiotic nitrogen fixation [36].Using 16S-rRNA gene clone libraries of soil [37] it was shown that Lasiurus sindicus, a highly nutritive, drought tolerant, perennial grass of Thar Desert of Rajasthan harbours in its rhizosphere Grampositive bacteria, Actinobacteria being the most predominant ones, closely followed by Firmicutes. PCR amplification of nifH genes revealed a predominance of Pseudomonas pseudoalcaligenes.…”

mentioning

confidence: 99%

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Recent Advances in Biological Nitrogen Fixation in Agricultural Systems

Rao¹

2014

Proceedings of the Indian National Science Academy

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The environmental concerns due to the increasing amount of the reactive forms of nitrogen in atmosphere, originating fro m t h e man u fact u re an d u se o f ch emi cal fert i l i zers h ave resu l t ed i n a re-fo cu s o n t h e i mp o rt an ce o f b i o l o gi cal n i t ro gen fi xat i o n (BNF ), p art i cu l arl y b y l egu mes. Th e wo rl d wi d e co n t ri b u t i o n o f BNF i s est i mat ed at 1 0 5 Tg yr -1 . N i t r o g e n f i x a t i o n is catalysed by the enzyme nitrogenase. Advances have included discovery of alternative nitrogenases, elucidation of more details on the mechanism of action, discovery of novel nitrogenases, existence of nitrogenase siblings in eukaryotes etc. There are fresh efforts to engineer cereal plants to nodulate and fix nitrogen. Discovery of common signalling mechanisms between mycorrhization and nodulation, discovery of cereal endophytes and advances in plastid physiology have given a f r e s h i m p e t u s t o s u c h a p p r o a c h e s . H o w e v e r , t h e c o n t r i b u t i o n o f a g r o n o m i c a l l y s i g n i f i c a n t q u a n t i t i e s o f N t h r o u g h e n d o p h y t e sstill requires more rigorous evidences. Advances in molecular biology have included a greater understanding of the native diversity of rhizobia and together with advances in plant breeding for selection of high nodulating genotypes, presents an attractive opportunity to maximize BNF. Recent advances include the discovery of novel rhizobial species, emphasis on study of climate change and adaptation to various abiotic stresses like high temperature, drought and salinity. This review fo cu ses o n maj o r d evel o p men t s i n BNF i n l ast t wo d ecad es wi t h emp h asi s o n rh i zo b i a. Th e b en efi ci al effect s o f ap p l yi n g organics and of rhizobial inoculation practices are discussed to bring out the strategies to improve the contribution of BNF in agriculture.Key Words: Climate Change; Endosymbiosis; Fertilizer; Nitrogenase; Nodulation; Rhizobium; Salinity; Soybean *Author for Correspondence: E-mail: desiraju.rao@gmail.com; Mob: 09303129740 Proc Indian Natn Sci Acad 80 No. 2 June 2014 Spl. Sec. pp. 359-378 Printed in India. IntroductionNitrogenous fertilizers have revolutionized crop yields and food availability worldwide. Of all the previous century's technological marvels, the HaberBosch process of manufacturing ammonia has made the most difference to our survival and it is considered t h e m o s t v a l u a b l e i n v e n t i o n o f t h e p r e v i o u s millennium [1]. However, this has come at a s u b s t a n t i a l e c o n o m i c a n d e n v i r o n m e n t a l c o s t . I n d u s t r i a l n i t r o g e n f i x a t i o n i s a $ 1 0 0 b i l l i o n p e r y e a r global industry, growing and bringing with it the concomitant environmental nitrogen pollution effects.Intensive cropping with the use of high analysis fertilizers coupled with a concomitant reduction in recycling of organics or other wastes has led to a decline in the organic carbon levels i...

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Section: Rhizobium and Pgpr Inoculationmentioning

confidence: 97%

Section: Heterotrophic N Fixationmentioning

confidence: 99%

Section: Green Manuring and Residual N Benefitsmentioning

confidence: 99%

mentioning

confidence: 99%

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Recent Advances in Biological Nitrogen Fixation in Agricultural Systems

Rao¹

2014

Proceedings of the Indian National Science Academy

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show abstract

“…The use of Azospirillum as helper bacteria used in combination with rhizobium increased the effect of rhizobium in soil fixation. Azotobacter and rhizobium contributed 78.8 kg N ha −1 year −1 total N to soil in soybean-wheat rotation (Rawat et al 2013). Plant nutrition for N has also been improved by the application of some fungal inoculants.…”

Section: Nitrogen (N)mentioning

confidence: 99%