Effects of added organic matter on microbial biomass nitrogen dynamics and plant uptake in paddy soils

1997 ◽  
pp. 777-778 ◽  
Author(s):  
K. Inubushi ◽  
F. Shibahara ◽  
K. Hasegawa ◽  
S. Yamamuro
Keyword(s):  
Organic Matter ◽  
Microbial Biomass ◽  
Plant Uptake ◽  
Nitrogen Dynamics ◽  
Paddy Soils ◽  
Microbial Biomass Nitrogen

Microbial Activity in Soils of Vegetation-Growing Concrete Slopes

2012 ◽  
Vol 599 ◽  
pp. 124-127
Author(s):  
Cheng Hu Zhang ◽  
Ting Ting Song ◽  
Ju Liu ◽  
Hui Juan Xia ◽  
Jian Zhu Wang
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Microbial Biomass ◽  
Negative Correlation ◽  
Microbial Biomass Carbon ◽  
Significant Negative Correlation ◽  
Concrete Technology ◽  
Microbial Biomass Nitrogen ◽  
Natural Restoration ◽  
Microbial Quotient

Natural restoration slope and vegetation-growing concrete slope were selected as plots. Soil water content (SWC), pH, and soil organic matter, total nitrogen content (TN), total organic carbon (TOC), microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), basal respiration, microbial quotient and metabolic quotient (qCO2) were analyzed. The main results show that: Soil organic matter, TN and MBC of 0-10 cm soil in the natural restoration slope are significantly lower than that in the vegetation-growing concrete slopes at 0.05 level. Both MBC and MBN show a highly significant positive correlation with soil organic matter and TN. Microbial quotient shows a highly significant negative correlation with TOC and MBN, and shows a significant negative correlation with MBC. The qCO2 shows a highly significant negative correlation with pH, and a significant negative correlation with MBC. The vegetation-growing concrete technology can improve the soil ecosystem in the impaired slope.

Dynamics of microbial biomass nitrogen as influenced by organic matter application in paddy fields

1998 ◽  
Vol 44 (2) ◽  
pp. 167-178 ◽  
Author(s):  
Fujiyoshi Shibahara ◽  
Shigekazu Yamamuro ◽  
Kazuyuki Inubushi
Keyword(s):  
Organic Matter ◽  
Microbial Biomass ◽  
Paddy Fields ◽  
Microbial Biomass Nitrogen

Organic Matter—Solid Phase Interactions Are Critical for Predicting Arsenic Release and Plant Uptake in Bangladesh Paddy Soils

2011 ◽  
Vol 45 (14) ◽  
pp. 6080-6087 ◽  
Author(s):  
Paul N. Williams ◽  
Hao Zhang ◽  
William Davison ◽  
Andrew A. Meharg ◽  
Mahmud Hossain ◽  
...  
Keyword(s):  
Organic Matter ◽  
Plant Uptake ◽  
Solid Phase ◽  
Paddy Soils

scholarly journals A study on organic matter and nitrogen dynamics in wetland paddy soils of Bangladesh

2019 ◽  
Vol 4 (1) ◽  
pp. 1-7
Author(s):  
M.A. Alam ◽  
M.M. Rahman ◽  
M.Z. Kamal ◽  
H.K. Shiragi ◽  
M.S. Monira ◽  
...  
Keyword(s):  
Organic Matter ◽  
Nitrogen Dynamics ◽  
Paddy Soils

Nitrogen cycling in brigalow clay soils under pasture and cropping

Soil Research ◽  
1997 ◽  
Vol 35 (6) ◽  
pp. 1323 ◽  
Author(s):  
F. A. Robertson ◽  
R. J. K. Myers ◽  
P. G. Saffigna
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Microbial Biomass ◽  
Plant Uptake ◽  
Significant Proportion ◽  
Clay Soils ◽  
Plant Residues ◽  
Panicum Maximum ◽  
N Availability ◽  
Soil Inorganic

Clay soils previously under native brigalow (Acacia harpophylla) forest are highly productive under annual cropping in central and southern Queensland. Grass pastures sown on these soils are initially productive, but deteriorate after several years because of N-stress (rundown). The aim of this work was to compare the patterns of N cycling in these pasture and cropping systems, in order to understand the rundown of the pastures. A small pulse of 15N-labelled ammonium sulfate was applied in the field to sites cropped with sorghum (Sorghum bicolor) and under green panic (Panicum maximum var. trichoglume) pasture, and its movement through the soil and plant pools was followed over 2 growing seasons. There were large differences in the cycling of 15N in the cropping and pasture systems. Under sorghum, 60% of the applied 15N was immobilised by microorganisms after 4 days, after which it was re-mineralised. Plant uptake and stabilisation in soil organic matter and clay were relatively slow. The first sorghum crop assimilated 14% of the applied 15N. During the second season, most of the 15N was stabilised in soil organic matter and clay (maximum 42%). A significant proportion of the 15N remained in the soil inorganic pool over the 2 seasons. Under green panic, 82% of the 15N left the soil inorganic pool within 4 days and entered the microbial biomass, soil organic matter, and the plant. Uptake and re-release of 15N were most rapid in the microbial biomass (maximum uptake 34% of applied after 4 days). Microbial immobilisation and re-mineralisation were, however, slower under green panic than under sorghum. The pasture plant accumulated 32% of the applied 15N, two-thirds of which was re-released in the second season. Stabilised N represented up to 62% of the applied 15N, and was consistently greater under green panic than under sorghum. After 2 seasons, 15N was released from the stabilised N pool in both systems, at approximately the same rate as it had been stabilised. At the end of the experiment, 40% of the applied 15N was unaccounted for in the pasture system, and 66% in the crop system. The reduced N availability in the pasture system was attributed to immobilisation of N in soil organic matter and clay, plant material, and, to a lesser extent, soil microbial biomass. This immobilisation resulted from the large accumulation of carbonaceous plant residues.

scholarly journals Soil Characteristics in Moist Tropical Forest of Sunsari District, Nepal

2013 ◽  
Vol 14 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Tilak Prasad Gautam ◽  
Tej Narayan Mandal
Keyword(s):  
Organic Matter ◽  
Microbial Biomass ◽  
Organic Carbon ◽  
Total Nitrogen ◽  
Microbial Biomass Carbon ◽  
Deep Layer ◽  
Water Holding Capacity ◽  
Biomass Carbon ◽  
Microbial Biomass Nitrogen ◽  
Water Holding

The physico-chemical properties of soils of tropical moist forest (Charkoshe jungle) in Sunsari district of eastern Nepal were analyzed. The samples were collected during summer season from three depths: upper (0-15 cm), middle (15-30 cm) and deep (30-45 cm). They were analyzed for texture, pH, moisture, water holding capacity, organic carbon, total nitrogen, organic matter and microbial biomass carbon and nitrogen. The forest soil of upper and middle layers was loamy whereas that of deep layer was sandy loam. The pH value was lower (5.6) in upper layer than in the deep layer (6.6). The moisture content, water holding capacity, organic carbon, total nitrogen and organic matter were higher in upper layer and decreased with increasing depth. The higher level of soil nutrients in upper layer was due partly to reduction in the loss of top soil and partly to the increased supply of nutrients from the decomposed form of litter and fine roots of the forest plants. The average value of microbial biomass carbon in the soil was 676.6 μg g-¹and microbial biomass nitrogen was 59.0 μg g-¹. Nepal Journal of Science and Technology Vol. 14, No. 1 (2013) 35-40 DOI: http://dx.doi.org/10.3126/njst.v14i1.8876

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