scholarly journals EFFECTS OF LONG-TERM CONSERVATION TILLAGE ON SOIL NITROGEN CONTENT AND ORGANIC NITROGEN COMPONENTS IN A CHINESE MOLLISOL

2018 ◽  
Vol 16 (5) ◽  
pp. 5517-5528
Author(s):  
D. D. HUANG ◽  
X. W. CHEN ◽  
G. J. CAO ◽  
A. Z. LIANG ◽  
S. X. JIA ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Soil Nitrogen ◽  
Organic Nitrogen ◽  
Conservation Tillage

Changes in the nitrogen content and pH of the mobilong clay as influenced by land use

1959 ◽  
Vol 10 (5) ◽  
pp. 637 ◽  
Author(s):  
JS Russell ◽  
DL Harvey
Keyword(s):  
Land Use ◽  
Nitrogen Content ◽  
Organic Nitrogen ◽  
Inverse Relation ◽  
Land Use Pattern ◽  
Nitrogen Levels ◽  
Probable Effect ◽  
Irrigation Drainage ◽  
Made In

The surface horizons of 40 profiles of the Mobilong clay hare been analysed for total nitrogen and pH, and the analyses compared with similar ones made in 1929. Soils which were originally high in nitrogen have declined, those with medium levels hare remained substantially the same, arid those which were originally low have increased in nitrogen content. The Mobilong clay thus appears to be approaching an equilibrium nitrogen content which under the present land use pattern of irrigation, drainage, and management approximates to 0.50 per cent. nitrogen. It seems probable that further declines will occur in the nitrogen content of those soils which are greatly in excess of this value, though at a slower rate than formerly. On the other hand increases in the nitrogen content of those soils with values less than this should occur. The implications of these changes, both in relation to future land use practices and in relation to general concepts regarding the effect of grass-legume pastures on soil nitrogen levels, are discussed. Changes in pH were found to ha essentially in inverse relation to the changes in nitrogen. Thus soils which have decreased in organic nitrogen have increased in pH, and vice versa. The probable effect of flooding and subsequent deposition on long term changes in the Mobilong clay is discussed.

Soil Nitrogen Forms and Availability in Paddy Soil under Different Fertilization Methods

2014 ◽  
Vol 1073-1076 ◽  
pp. 643-647
Author(s):  
Ji Wang ◽  
Min Jie Fu ◽  
Yun Jiang Liang ◽  
Ze Yu Guan ◽  
Jiu Dao Li
Keyword(s):  
Amino Acid ◽  
Path Analysis ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Soil Nitrogen ◽  
Organic Nitrogen ◽  
Paddy Fields ◽  
Available Nitrogen ◽  
Amino Acid Nitrogen ◽  
Hydrolyzable Nitrogen

To reveal the characteristics of soil organic nitrogen components under different long-term fertilization methods in paddy fields, 7 typical paddy fields in the Yanbian Korean Autonomous Prefecture of Jilin Province were selected, and soil samples were collected from 0 to 10 cm and 10 to 20 cm. The samples were analyzed for available nitrogen, total nitrogen and inorganic nitrogen content and each component of organic nitrogen. The results showed that soil nitrogen decreased with increasing soil depth in the soil profile. Different fertilization methods had a significant or greater effect on the available nitrogen, total nitrogen and organic nitrogen in 0 to 10 cm soil, and it had a significant effect on the total nitrogen content in 10 to 20 cm soil. Combined applications of organic and inorganic fertilizer was beneficial for improving available soil nitrogen. Applying organic fertilizer was beneficial for the accumulation of total nitrogen and organic nitrogen. Organic nitrogen was a major part of soil nitrogen. In terms of directly affecting the path analysis, the effects of ammonia sugar nitrogen, acid-hydrolyzable unknown nitrogen and non-hydrolyzable nitrogen on available nitrogen are significant. A small negative correlation was shown between amino acid nitrogen and available nitrogen. Amino acid nitrogen indirectly affected the available nitrogen through other components. In terms of the general effect of the path analysis, the influence of non-hydrolyzable nitrogen to available nitrogen was the highest. An important factor to consider in relation to reasonable fertilization is that promoting non-hydrolyzable nitrogen and unknown acid-hydrolyzable nitrogen transformed into available nitrogen and accumulated available nitrogen.

Capabilities of Biological Nitrogen Removal Processes from Wastewater

1991 ◽  
Vol 23 (4-6) ◽  
pp. 669-679 ◽  
Author(s):  
M. Henze
Keyword(s):  
Activated Sludge ◽  
Nitrogen Content ◽  
Nitrogen Removal ◽  
Organic Nitrogen ◽  
Biological Nitrogen Removal ◽  
Effluent Quality ◽  
Removal Processes ◽  
Biological Nitrogen ◽  
Soluble Organic Nitrogen

Biological denitrification of wastewater is a widespread technology for nitrogen removal from wastewater. Activated sludge technology is dominating over biofilm processes in practice. Recirculation and alternating processes are used to the same degree. The typical effluent quality that can be achieved on a long-term average is 4–10 mg/l of total nitrogen. Under certain circumstances effluent concentrations of 2–3 mg N/l can be obtained. Soluble organic nitrogen and nitrate are the dominating compounds in the effluent. Of these two, the soluble organic nitrogen content is difficult to control.

Effects of Long-Term Irrigation and Nitrogen Regimes on Soil Nitrogen Con-tent and Paste Property of Wheat Grain

2018 ◽  
Vol 44 (7) ◽  
pp. 1067 ◽  
Author(s):  
Sha-Sha LI ◽  
Geng MA ◽  
Wei-Xing LIU ◽  
Juan KANG ◽  
Yu-Lu CHEN ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Wheat Grain

Soil Nitrogen Movement under Sustainable Vegetable Production Systems

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 494f-495 ◽  
Author(s):  
Amy M. Johnson ◽  
Greg D. Hoyt
Keyword(s):  
Pest Management ◽  
Soil Nitrogen ◽  
Conservation Tillage ◽  
Management Strategies ◽  
Conventional Tillage ◽  
Plant Diseases ◽  
Vegetable Production ◽  
Beneficial Arthropods ◽  
Weed Species ◽  
Available Nitrogen

An experiment was established to determine the effect of different tillage practices, vegetable crop rotations, and pest management strategies on crop yield, plant diseases, pest and beneficial arthropods, weed species changes over time, and soil environmental consequences. This poster describes nitrogen movement from the various treatments over a 3-year rotation. The treatments are: 1) conventional tillage with chemically based IPM; 2) conventional tillage with biologically based IPM; 3) conservation tillage with chemically based IPM; 4) conservation tillage with biologically based IPM; and 5) conventional tillage with no fertilizer or pest management. Mid-season soil analyses with depth showed chemical-fertilized plowed and conservation-tilled treatments with more soil available nitrogen at most depths compared to the biological-based IPM systems (soybean meal was used as a nitrogen source). However, the biological-based systems did supply enough soil nitrogen to produce similar yield results as the chemical-based systems. Less soil nitrate was measured in the 30- to 90-cm depths at harvest from the biological-based systems than chemical-based systems. Conservation-tilled systems had greater nitrate with depth compared to conventional-tilled systems.

scholarly journals Effect of long-term conservation tillage on soil biochemical properties in Mediterranean Spanish areas

2009 ◽  
Vol 105 (1) ◽  
pp. 55-62 ◽  
Author(s):  
E. Madejón ◽  
J.M. Murillo ◽  
F. Moreno ◽  
M.V. López ◽  
J.L. Arrue ◽  
...  
Keyword(s):  
Conservation Tillage ◽  
Biochemical Properties ◽  
Soil Biochemical Properties

Traffic and residue cover effects on infiltration

Soil Research ◽  
2001 ◽  
Vol 39 (2) ◽  
pp. 239 ◽  
Author(s):  
Yuxia Li ◽  
J. N. Tullberg ◽  
D. M. Freebairn
Keyword(s):  
Conservation Tillage ◽  
Infiltration Rate ◽  
Farming System ◽  
Infiltration Capacity ◽  
Plant Available Water ◽  
The Impact ◽  
Reduced Time ◽  
Factor Governing ◽  
Controlled Traffic

Wheel traffic can lead to compaction and degradation of soil physical properties. This study, as part of a study of controlled traffic farming, assessed the impact of compaction from wheel traffic on soil that had not been trafficked for 5 years. A tractor of 40 kN rear axle weight was used to apply traffic at varying wheelslip on a clay soil with varying residue cover to simulate effects of traffic typical of grain production operations in the northern Australian grain belt. A rainfall simulator was used to determine infiltration characteristics. Wheel traffic significantly reduced time to ponding, steady infiltration rate, and total infiltration compared with non-wheeled soil, with or without residue cover. Non-wheeled soil had 4—5 times greater steady infiltration rate than wheeled soil, irrespective of residue cover. Wheelslip greater than 10% further reduced steady infiltration rate and total infiltration compared with that measured for self-propulsion wheeling (3% wheelslip) under residue-protected conditions. Where there was no compaction from wheel traffic, residue cover had a greater effect on infiltration capacity, with steady infiltration rate increasing proportionally with residue cover (R 2 = 0.98). Residue cover, however, had much less effect on inf iltration when wheeling was imposed. These results demonstrated that the infiltration rate for the non-wheeled soil under a controlled traffic zero-till system was similar to that of virgin soil. However, when the soil was wheeled by a medium tractor wheel, infiltration rate was reduced to that of long-term cropped soil. These results suggest that wheel traffic, rather than tillage and cropping, might be the major factor governing infiltration. The exclusion of wheel traffic under a controlled traffic farming system, combined with conservation tillage, provides a way to enhance the sustainability of cropping this soil for improved infiltration, increased plant-available water, and reduced runoff-driven soil erosion.

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