Modelling of microbial processes that govern degradation of organic substrates in soil, with special reference to pesticides

1990 ◽  
Vol 329 (1255) ◽  
pp. 369-373 ◽  
Keyword(s):  
Microbial Population ◽  
Large Fraction ◽  
Organic Substrates ◽  
High Concentration ◽  
Deterministic Models ◽  
Soil Microbial ◽  
Low Concentrations ◽  
Biokinetic Parameters ◽  
Soil Microbial Population ◽  
Kinetics Of

We tried to develop deterministic models for kinetics of 2,4-D breakdown in the soil based on the following considerations: (i) at low concentrations degradation results from maintenance consumption by a large fraction of the soil microbial population; (ii) at high concentration in addition to the maintenance consumption there is a growth-associated carbon incorporation by a small specific microbial population. Values for the biokinetic parameters are consistent with those commonly found in the literature. Comparison between observed and simulated curves suggests that a non-negligible part of the pesticidal carbon exists as microbial by-products.

scholarly journals Carbon and Microbial Dynamics in Soil on Biochar Compost Plus Treatment

2020 ◽  
Vol 17 (2) ◽  
pp. 138-143
Author(s):  
Wahyu Purbalisa ◽  
Ina Zulaehah ◽  
Dolty Melyga W. Paputri ◽  
Sri Wahyuni
Keyword(s):  
Soil Carbon ◽  
Microbial Population ◽  
Organic Fertilizer ◽  
Organic Soil ◽  
Microbial Consortia ◽  
Soil Microbial ◽  
Randomized Design ◽  
Soil Microbial Population ◽  
Compost Treatment ◽  
Screen House

Carbon and microbes in the soil fluctuated from time to time due to various things. This study aims to determine the dynamics of carbon and microbes in the soil in the treatment of biochar-compost. In addition to the use of biochar-compost, this research also uses nano biochar and enrichment with microbial consortia. The study was conducted at the screen house using a complete randomized design with three replications with following treatments: control / without organic fertilizer (P0), compost (P1), biochar-compost 1: 4 (P2), nano-biochar-compost 1: 4 (P3 ), biochar-compost + microbial consortia (P4), compost + microbial consortia (P5) and biochar-compost + microbial consortia (P6) with a dose of 2.5 tons/ha respectively. Biochar comes from corncobs. Compost biochar plus application was made before planting.  Parameters observed were soil carbon (C-organic), soil acidity (pH) at 7 DAA, 37 DAA and after harvest, and the total soil microbial population at 2 DAA and after harvest. Soil carbon was measured using Walkey and Black method measured by spectrophotometer, soil pH using a soil: water ratio = 1: 5 and measured by a pH meter, the total microbial population using Total Plate Counting (TPC) method. The results showed carbon and soil microbial populations decreased over time, except for microbial communities in a single compost treatment.

The Quantitative Characters of Soil Microbes under Different Vegetations in an Eutrophic Lake Wetland

2013 ◽  
Vol 295-298 ◽  
pp. 178-183 ◽  
Author(s):  
Lin Hui Wu ◽  
Ji Zhao ◽  
Min Hui ◽  
Yu Qin Shao
Keyword(s):  
Physicochemical Properties ◽  
Microbial Population ◽  
Significant Negative Correlation ◽  
Eutrophic Lake ◽  
Soil Physicochemical Properties ◽  
Soil Microbial ◽  
Quantitative Characters ◽  
Key Factor ◽  
Suaeda Glauca ◽  
Soil Microbial Population

There was varying degrees of correlation between the number of soil microbial and soil physicochemical properties, there existed a significant positive correlation (P<0.05) between the number of soil microbial and soil organic matter, total nitrogen; while there existed a significant negative correlation(P<0.01) between the number of soil microbial and pH, which showed that the salinization was the key factor that affected the distribution of soil microbial quantity.The study on variation of the number of soil microbial and soil physicochemical properties of the four kinds of plant community at WuLiangSuHai wetlands, reveals that: Chenopodiacea (Suaeda glauca Bunge) plots, Zygophyllaceae (Nitraria tangutorum Bobr) plots, Artificial Tamarix plots and Artificial Elaeagnus angustifolia plots. The results showed that: 0-20cm of the topsoil, the soil microbial population of them was different, Bacteria, Actinomycete and Fungi on the Artificial tamarix soil was significantly higher than other plant. The number of microbe in Chenopodiacea (Suaeda glauca Bunge)plots soil was the lowest.

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