Soil enzyme and microbial activities in a grazing ecosystem of Patagonian Monte, Argentina

Geoderma ◽  
2011 ◽  
Vol 162 (3-4) ◽  
pp. 281-287 ◽  
Author(s):  
Luciano H. Prieto ◽  
Mónica B. Bertiller ◽  
Analía L. Carrera ◽  
Nelda L. Olivera
Keyword(s):  
Soil Enzyme ◽  
Microbial Activities ◽  
Grazing Ecosystem

Combined biochar and nitrogen fertilizer change soil enzyme and microbial activities in a 2-year field trial

2020 ◽  
Vol 99 ◽  
pp. 103212
Author(s):  
Dali Song ◽  
Lu Chen ◽  
Shuai Zhang ◽  
Qin Zheng ◽  
Sami Ullah ◽  
...  
Keyword(s):  
Nitrogen Fertilizer ◽  
Field Trial ◽  
Soil Enzyme ◽  
Microbial Activities

scholarly journals Spatial and temporal variability in microbial activities of coastal acid saline soils of Goa, India

2015 ◽  
Vol 7 (4) ◽  
pp. 3087-3115 ◽  
Author(s):  
G. R. Mahajan ◽  
B. L. Manjunath ◽  
A. M. Latare ◽  
R. D'Souza ◽  
S. Vishwakarma ◽  
...  
Keyword(s):  
Temporal Variability ◽  
Enzyme Activities ◽  
Soil Enzyme ◽  
Saline Soils ◽  
Spatial And Temporal Variability ◽  
Soil Enzyme Activities ◽  
Microbial Activities ◽  
Soil Microbial ◽  
Post Monsoon ◽  
Salinity Levels

Abstract. The aim of the present investigation was to study the spatio-temporal variability of the microbial activities in coastal saline soils (locally called Khazan) of Goa, India (west coast region). The coastal soil salinity is a major constraint for reduced crop yields and abandonment of farming in these areas. Three replicated global positioning based soil samples (0–0.20 m depth) from each of four salinity groups i.e. non-saline (EC=0.08±0.06 dS m−1), weakly saline (EC=2.04±0.06 dS m−1), moderately saline (EC=3.50±0.57 dS m−1) and strongly saline (EC=5.49±0.49 dS m−1) during three seasons–monsoon, post-monsoon and pre-monsoon were collected. Soil microbial activity in terms of soil microbial carbon (MBC), MBC as a fraction of soil organic carbon (SOC) (MBC/SOC), basal soil respiration (BSR), metabolic quotient (qCO2) and soil enzyme activities–dehydrogenase, phosphatase and urease was tested. In all the seasons, the soil cationic composition depended significantly (p<0.01) on salinity levels and the exchangeable sodium (Na) was the second most dominant among the tested cations. The MBC, MBC/SOC and BSR reduced significantly with increasing salinity, whereas qCO2 increased with increased salinity levels. In general, MBC, MBC/SOC and BSR and soil enzyme activities were observed as: salinity levels–strongly saline < moderately saline < weakly saline < non-saline and season–post–monsoon > monsoon > during pre-monsoon season. The mean MBC and MBC/SOC of non-saline soils were 1.61 and 2.28 times higher than that of strongly saline soils, whereas qCO2 of strongly saline soils was 2.4 times higher than that of non-saline soils. This indirectly indicates the salinity stress on the soil microorganisms. Irrespective of season, the soil enzyme activities decreased significantly (p<0.05) with increasing salinity levels. Suitable countermeasures needs to be taken up to alleviate the depressive salinity effect on the microbial and activity for the sustainable crop production in the coastal saline soils of Goa, India.

KEBERADAAN BAKTERI PELARUT FOSFAT DAN AKTIVITAS ENZIM FOSFATASE TANAH DAERAH PERAKARAN TANAMAN OBAT DARI KEBUN RAYA CIBODAS

2018 ◽  
Vol 6 (3) ◽  
Author(s):  
Suliasih Suliasih
Keyword(s):  
Alkaline Phosphatase ◽  
Soil Sample ◽  
Rhizosphere Soil ◽  
Botanical Garden ◽  
Soil Enzyme ◽  
Soil Samples ◽  
Phosphate Solubilizing Bacteria ◽  
Bacillus Sp ◽  
Phosphate Solubilizing ◽  
Serratia Rubidaea

A study was undertaken to investigate to occurance of phosphate solubilizing bacteria from rhizosphere soil samples of medicine plants in Cibodas Botanical Garden. 13 soil samples of medicine plants are collected randomly The result shows that 71 isolates of phosphate solubilizing bacteria were isolated, and 10 species of these organism was identified as Azotobacter sp, Bacillus sp, Chromobacterium sp, C.violaceum, Citrobacter sp. , Enterobacter sp., E. liquefaciens. Nitrosomonas sp., Serratia rubidaea, Sphaerotillus natans. Azotobacter sp. And Bacillus sp. Are found in all of soil tested. Conversely, Serratia rubidaea is only in the sample from rhizosphere of Plantago mayor The activity of acid alkaline phosphatase in soil tested ranged from 0.78 – 60,18 ugp nitrophenole/g/h, with the higest values being recorded in soil sample from rhizosphere of “Lavender”.Keywords : phosphate solubilizing bacteria, soil enzyme phosphatase

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