scholarly journals Effect of Fomesafen on the abundance of soil microorganisms in soybean crop

Pesticidi ◽  
2003 ◽  
Vol 18 (2) ◽  
pp. 109-114
Author(s):  
Ljiljana Santric ◽  
Vaskrsija Janjic ◽  
Ljiljana Radivojevic
Keyword(s):  
Soil Type ◽  
Soil Microorganisms ◽  
Soil Types ◽  
Microbiological Analysis ◽  
Nitrogen Fixing ◽  
Cellulolytic Bacteria ◽  
Nitrogen Fixing Bacteria ◽  
Laboratory Environment ◽  
Soybean Crop ◽  
Set Up

Effect of the herbicide Fomesafen on the abundance of soil microorganisms was investigated. The abundance of total microflora, fungi, actinomycetes aerobic nitrogen fixing bacteria (Azotobacter) and cellulolytic bacteria was studied. Trials were set up on smonitza and alluvium soil types in laboratory environment. Fomesafen was applied at 0.2 and 0.4 kg/ha rate. Microbiological analysis was done 1, 3, 7, 14, 30 and 60 days after treatment. The acquired results showed that fomesafen had caused a decrease in the abundance of total microorganisms, aerobic nitrogen fixing bacteria and cellulolytic bacteria, the highest effect being recorded in the interval between the 7th and 14th post-treatment days. The most susceptible genus was Azotobacter. Fomesafen was found to cause an increase in the abundance of actinomycetes, while no shangein fungi abundance was recorded. No difference in the intensity of effect on the investigated parameters was found between the applied rate and soil type, except a 36% reduction of total microorganisms on smonitza and 51% on alluvium, and 48% reduction of cellulolytic bacteria on smonitza and 41% on alluvium.

scholarly journals Peran Eksopolisakarida Azotobacter dan Bahan Organik untuk Meningkatkan Nodulasi dan Biomassa Kedelai pada Dua Ordo Tanah

2019 ◽  
Vol 47 (2) ◽  
pp. 156-162
Author(s):  
Reginawanti Hindersah ◽  
Neni Rostini ◽  
Agustinus Marthin Kalay ◽  
Dan Arief Harsono
Keyword(s):  
Organic Matter ◽  
N Uptake ◽  
Dry Weight ◽  
Nitrogen Fixing ◽  
Nitrogen Fixing Bacteria ◽  
Shoot Dry Weight ◽  
Compost Application ◽  
Shoot Weight ◽  
Set Up ◽  
Rhizobium Population

Exopolysaccharide (EPS) produced by nitrogen-fixing bacteria Azotobacter protect nitrogenase from oxygen. In legume,EPS plays a role in the immobilization of rhizobia to the roots. The objective of this experiment was to study the effect of EPSAzotobacter and organic matter on increasing number of nodules and biomass of soybeans grown in Inceptisols and Ultisols;as well as nitrogen-fixing bacteria population in soybean rhizosphere. The experiment was set up in a completely randomizedblock design with five replications to test combined treatments of two doses of crude EPS and organic matter. Nodule number,shoot dry weight and nitrogen uptake, as well as Azotobacter and Rhizobium population in soybean grown in Inceptisolsfollowing crude EPS and compost application, were higher than those grown in Ultisols. The application of EPS and compostIn Ultisols did not affect the number of nodule and other traits, but in Inceptisols, adding 6.25 g of compost and 20 mL of EPSto each plant increased the number of nodules and shoot weight at 42 days after planting. However, the highest N uptake wasdemonstrated by soybean received 10 mL and 20 mL EPS along with 12.5 g compost.

Distribution of Azotobacter in Eastern Canadian soils and in association with plant rhizospheres

1988 ◽  
Vol 34 (6) ◽  
pp. 815-817 ◽  
Author(s):  
Manoj M. Kole ◽  
William J. Page ◽  
Illimar Altosaar
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Ph ◽  
Soil Type ◽  
Soil Moisture Content ◽  
Azotobacter Chroococcum ◽  
Nitrogen Fixing ◽  
Nitrogen Fixing Bacteria ◽  
Canadian Soils

Aerobic nitrogen-fixing bacteria were readily isolated from Eastern Canadian soils. The majority (89%) of these soils were found to contain Azotobacter chroococcum and other members of this family. These bacteria ranged from 1 × 102 to 2.5 × 104 bacteria per gram soil. The soil type had relatively little effect on the population of these bacteria provided a soil moisture content of 10 to 18% and a soil pH of 6.5 to 8.0 was maintained. The presence of wheat or common lawn grasses did not promote better establishment of Azotobacteraceae. However, slightly larger populations of these bacteria were associated with corn, oat, and soybean rhizospheres.

scholarly journals Effects of Metribuzin on the abundance and activity of some groups of soil microorganisms

Pesticidi ◽  
2003 ◽  
Vol 18 (2) ◽  
pp. 99-107 ◽  
Author(s):  
Ljiljana Radivojevic ◽  
Ljiljana Santric ◽  
Radmila Stankovic-Kalezic ◽  
Dragica Brkic ◽  
Vaskrsija Janjic
Keyword(s):  
Soil Respiration ◽  
Soil Microorganisms ◽  
Microbiological Activity ◽  
Chernozem Soil ◽  
Laboratory Environment ◽  
Application Rates ◽  
Dry Soil ◽  
Set Up ◽  
Almost All ◽  
Aerobic And Anaerobic

Effects of the metribuzin herbicide on soil microorganisms were investigated Trials were set up on a chernozem soil in laboratory environment. Metribuzin application rates were 0.3, 0.6, 1.2 and 2.4 mg a.i./500g air-dry soil at 10?C, 20?C and 30?C. Soil respiration (amount of released CO2) and abundance of total microflora, fungi, actinomycetes, cellulolytics, ammonifiers nitrifiers, aerobic nitrogen fixiers (Azotobacter) and anaerobic nitrogen fixiers (Clostridium) were studied. Metribuzin was found to inhibit soil respiration, causing statistically highly significant changes of that area of microbiological activity in almost all trial variants. The effect of metribuzin on microorganism abundance varied. It caused a decrease in total microflora, fungi, cellulolytics, nitrifiers, and aerobic and anaerobic nitrogen fixiers (Azotobacter and Clostridium) at all temperatures, and reduced the abundance of actinomycetes at 10?C and 30?C. No effect on ammonifiers was recorded.

scholarly journals Effect of crop rotation in soil microorganisms

2021 ◽  
Vol 31 (3) ◽  
pp. 132-136
Author(s):  
Sunjidmaa Otgonbayar ◽  
Oyundalai Nyamdorj ◽  
Enkhmaa Erdenetugs
Keyword(s):  
Crop Rotation ◽  
Green Manure ◽  
Soil Microorganisms ◽  
Biological Indicator ◽  
Nitrogen Fixing ◽  
Nitrogen Fixing Bacteria ◽  
Number Of Microorganisms ◽  
Field Rotation

The aimed of this study was to effect of crop rotation on soil microorganisms activity, that’s soil biological indicator. Plots are Fallow-Wheat-Pea and Green manure fallow-Wheat-Oat+Melilotus of 3 fields rotation type. The study was conducted to determine the effect of crop rotation in soil biological indication is microbial active. Total number of microorganisms and nitrogen fixing bacteria determined in soil of three field rotation (Fallow-What-Peat, Green manure fallow-Wheat, Oat and Melilotus). The results of study in 2016-2019 in three field rotation – Peat, Wheat, Fallow were 85.6-96.9x106 CFU/g microorganisms. There were 87.5-89.3% bacteria and 10.6-12.4% actinomycetes. Rotation  fields of Oat and Melilotus, Green manure fallow, Wheat were 91.7-92.4 CFU/g microorganisms of it 82.1-84.4% bacteria and 15.5-17.8%-actinomycetes. Хөрсний бичил биетний идэвхид сэлгээний нөлөөг судалсан дүн Хөрсний биологийн илтгүүр болох бичил биетний идэвхид таримлын сэлгээний үзүүлэх нөлөөг судлах зорилгоор 3 талбайт Уринш-Буудай-Вандуйн, Ногоон бордуурт уринш–Буудай–Овъёос+Донник бүхий таримлуудын сэлгээний хөрсөнд нийт бичил биетний тоог зүйлийн бүрэлдэхүүнээр, мөн азот шингээгч ашигтай бактерийн тоог тус тус тодорхойлов. 2016-2019 оны судалгааны дүнгээр ЭТС-ийн 3 талбайт Вандуй, Буудай (цуулбар) – Уринш хувилбарын 1 г хөрсөнд 85.6-96.9 сая.ш бичил биетэн, үүний 87.5-89.3%-ийг бактери, 10.6-12.4%-ийг актиномицет, 3 талбайт О+Д-НБУ-Буудайн сэлгээний 1 г хөрсөнд 91.7-92.4 сая.ш бичил биетэн, үүний 82.1-84.4%-ийг бактери, 15.5-17.8%-ийг актиномицет эзэлж байна.  Түлхүүр үг: азот шингээгч, бактери, актиномицет, мөөгөнцөр

Soil response to chemicals used in a field experiment

2013 ◽  
Vol 27 (2) ◽  
pp. 151-158 ◽  
Author(s):  
S. Jezierska-Tys ◽  
A. Rutkowska
Keyword(s):  
Alkaline Phosphatase ◽  
Enzymatic Activity ◽  
Field Experiment ◽  
Soil Microorganisms ◽  
Block Design ◽  
Soil Samples ◽  
Alkaline Phosphatases ◽  
Soil Response ◽  
Negative Effect ◽  
Set Up

Abstract The effect of chemicals (Reglone 200 SL and Elastiq 550 EC) on soil microorganisms and their enzymatic activity was estimated. The study was conducted in a field experiment which was set up in the split-block design and comprised three treatments. Soil samples were taken six times, twice in each year of study. The results showed that the application of chemicals generally had no negative effect on the number of soil microorganisms. The application of Reglone 200 SL caused an increase of proteolytic and ureolytic activity and affected the activity of dehydrogenases, acid and alkaline phosphatases in the soil. The soil subjected of Elastiq 550 EC was characterized by lower activity of dehydrogenases, protease, urease and alkaline phosphatase.

scholarly journals Cowpea symbiotic efficiency, pH and aluminum tolerance in nitrogen-fixing bacteria

2014 ◽  
Vol 71 (3) ◽  
pp. 171-180 ◽  
Author(s):  
Bruno Lima Soares ◽  
Paulo Avelar Ademar Ferreira ◽  
Silvia Maria de Oliveira-Longatti ◽  
Leandro Marciano Marra ◽  
Marcia Rufini ◽  
...  
Keyword(s):  
Aluminum Tolerance ◽  
Nitrogen Fixing ◽  
Nitrogen Fixing Bacteria ◽  
Symbiotic Efficiency
Sign in / Sign up

Export Citation Format

Share Document