THE EFFECT OF THE GAMMA ISOMER OF BENZENE HEXACHLORIDE UPON THE MICROFLORA OF SUBMERGED RICE SOILS: II. EFFECT UPON NITROGEN MINERALIZATION AND FIXATION, AND SELECTED BACTERIA

1967 ◽  
Vol 13 (6) ◽  
pp. 621-627 ◽  
Author(s):  
K. Raghu ◽  
I. C. MacRae
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Tropical Soils ◽  
Inhibitory Effect ◽  
Rice Soils ◽  
Native Soil ◽  
Field Practice ◽  
Benzene Hexachloride

The effect of applications of γ-benzene hexachloride (γ-BHC) to two submerged tropical soils at rates equivalent to recommended field practice (5 kg/ha) and 10 times this level upon the mineralization of native soil nitrogen was studied. No inhibitory effect on nitrogen mineralization was detected. A significant increase in the amount of nitrogen mineralized was detected in one of the soils over a period of 16 weeks of submergence. Additions of γ-BHC at 6 kg/ha resulted in significant increases in nitrogen fixation in both soils. Populations of anaerobic, phosphate-dissolving bacteria were found to be higher in the two soils when they were treated with γ-BHC at 6 kg/ha.

Elevated CO2 increases nitrogen fixation and decreases soil nitrogen mineralization in Florida scrub oak

1999 ◽  
Vol 5 (7) ◽  
pp. 781-789 ◽  
Author(s):  
Bruce A. Hungate ◽  
PauL. Dijkstra ◽  
DalE. W. Johnson ◽  
C. RosS. Hinkle ◽  
BerT. G. Drake
Keyword(s):  
Nitrogen Fixation ◽  
Elevated Co2 ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Florida Scrub ◽  
Scrub Oak ◽  
Soil Nitrogen Mineralization

Ant-mediated effects on soil nitrogen mineralization vary with species in a tropical forest

CATENA ◽  
2021 ◽  
Vol 203 ◽  
pp. 105352
Author(s):  
Qianqian Zuo ◽  
Shaojun Wang ◽  
Ping Wang ◽  
Qianbin Cao ◽  
Shuang Zhao ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Soil Nitrogen Mineralization ◽  
Mediated Effects

scholarly journals Chickpea shows genotype-specific nodulation responses across soil nitrogen environment and root disease resistance categories

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Krista L. Plett ◽  
Sean L. Bithell ◽  
Adrian Dando ◽  
Jonathan M. Plett
Keyword(s):  
Nitrogen Fixation ◽  
Disease Resistance ◽  
Soil Nitrogen ◽  
Cellular Localization ◽  
Expression Patterns ◽  
Nodule Development ◽  
Nodule Formation ◽  
Symbiotic Relationship ◽  
Plant Genotype ◽  
Factors Affecting

Abstract Background The ability of chickpea to obtain sufficient nitrogen via its symbiotic relationship with Mesorhizobium ciceri is of critical importance in supporting growth and grain production. A number of factors can affect this symbiotic relationship including abiotic conditions, plant genotype, and disruptions to host signalling/perception networks. In order to support improved nodule formation in chickpea, we investigated how plant genotype and soil nutrient availability affect chickpea nodule formation and nitrogen fixation. Further, using transcriptomic profiling, we sought to identify gene expression patterns that characterize highly nodulated genotypes. Results A study involving six chickpea varieties demonstrated large genotype by soil nitrogen interaction effects on nodulation and further identified agronomic traits of genotypes (such as shoot weight) associated with high nodulation. We broadened our scope to consider 29 varieties and breeding lines to examine the relationship between soilborne disease resistance and the number of nodules developed and real-time nitrogen fixation. Results of this larger study supported the earlier genotype specific findings, however, disease resistance did not explain differences in nodulation across genotypes. Transcriptional profiling of six chickpea genotypes indicates that genes associated with signalling, N transport and cellular localization, as opposed to genes associated with the classical nodulation pathway, are more likely to predict whether a given genotype will exhibit high levels of nodule formation. Conclusions This research identified a number of key abiotic and genetic factors affecting chickpea nodule development and nitrogen fixation. These findings indicate that an improved understanding of genotype-specific factors affecting chickpea nodule induction and function are key research areas necessary to improving the benefits of rhizobial symbiosis in chickpea.

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