Stratification of soil aggregation and organic matter under conservation tillage systems in Africa

Abstract Conventional and conservation tillage systems can alter soil aggregation and total and labile soil organic matter (SOM) contents. This study aimed to determine the degree of soil aggregation, quantify total carbon (TC), permanganate oxidizable carbon (POXC), light organic matter (LOM), and potentially mineralizable carbon (CO2-C) contents in soils aggregates, and assess soil quality indices at sites under conventional and conservation tillage in the Cerrado region of Minas Gerais State, Brazil. Four experimental areas were analyzed: a area under conventional tillage for 20 years, a area under no-till for 6 years, a area under no-till for 18 years, and a reference area of undisturbed Cerrado vegetation. Soil aggregates retained on 8.0 to 4.0 mm sieves were evaluated for size class distribution and mean weight diameter. TC, POXC, LOM, daily and total CO2-C emissions were also analyzed. These data were used to calculate the C/N ratio and sensitivity, carbon pool, and lability indices. The results of SOM compartments were in agreement with those obtained for the soil aggregation status. Environmental conditions at no-till areas promoted macroaggregate formation and preserved TC and LOM contents, resulting in a high degree of aggregate stability. Soil quality indices were sensitive to identify changes between the reference area and managed areas. Soil aggregates from no-till areas had higher CO2-C emissions and accumulations than those from the conventional tillage area.

Download Full-text

CHEMICAL DIFFERENCES IN DARK BROWN CHERNOZEMIC Ap HORIZONS UNDER VARIOUS CONSERVATION TILLAGE SYSTEMS

Canadian Journal of Soil Science ◽

10.4141/cjss89-050 ◽

1989 ◽

Vol 69 (3) ◽

pp. 481-488 ◽

Cited By ~ 8

Author(s):

J. F. DORMAAR ◽

C. W. LINDWALL

Keyword(s):

Organic Matter ◽

Winter Wheat ◽

Conservation Tillage ◽

Conventional Tillage ◽

Soil Tillage ◽

Tillage Systems ◽

No Till ◽

Southern Alberta ◽

Chemical Fallow ◽

Extractable Organic Matter

The Ap horizons of two conservation tillage studies on Dark Brown Chernozemic soils in southern Alberta were sampled in 1986 following the fallow year. The first study, started in 1967, consisted of a wheat-fallow rotation under either no-till chemical fallow, blade-cultivate, or chemical fallow + blade-cultivate management. The second study, started in 1977, consisted of continuous winter wheat, winter wheat-barley-fallow, and winter wheat-fallow rotations under either no-till or conventional tillage management. Nine years of no-till continuous wheat and 19 yr of no-till in a wheat-fallow rotation both led to 40% of the dry aggregates being > 0.84 mm in diameter. The parameters selected helped to characterize differences in organic matter between soil tillage systems. Dehydrogenase and phosphatase activities were twice as high under no-till as under the blade-cultivate treatment. No-till also led to the largest monosaccharide accumulation in the soil. Carbohydrates, solvent-extractable organic matter, and chitin N were significantly higher in the > 0.84 mm diameter dry aggregates from the no-till treatment. The monosaccarides under the blade-cultivate regime were generally of microbial origin whereas those under the no-till regime were generally of plant origin. Key words: Water-stable aggregates, dry aggregates, enzyme activities, organic carbon, monosaccharides, fallow

Download Full-text

Physical, chemical, and biochemical mechanisms of soil organic matter stabilization under conservation tillage systems: A central role for microbes and microbial by-products in C sequestration

Soil Biology and Biochemistry ◽

10.1016/j.soilbio.2012.07.026 ◽

2013 ◽

Vol 57 ◽

pp. 124-134 ◽

Cited By ~ 117

Author(s):

César Plaza ◽

Denis Courtier-Murias ◽

José M. Fernández ◽

Alfredo Polo ◽

André J. Simpson

Keyword(s):

Organic Matter ◽

Soil Organic Matter ◽

Conservation Tillage ◽

C Sequestration ◽

Tillage Systems ◽

Physical Chemical ◽

Organic Matter Stabilization ◽

Biochemical Mechanisms ◽

By Products

Download Full-text

Conservation Tillage Impact on Soil Aggregation, Organic Matter Turnover and Biodiversity

Sustainable Agriculture Reviews - Organic Fertilisation, Soil Quality and Human Health ◽

10.1007/978-94-007-4113-3_6 ◽

2012 ◽

pp. 141-160 ◽

Cited By ~ 8

Author(s):

Tek Bahadur Sapkota

Keyword(s):

Organic Matter ◽

Conservation Tillage ◽

Soil Aggregation ◽

Organic Matter Turnover

Download Full-text

The effect of conservation tillage systems on sustainability of soil biological state of sandy loam soil in corn monoculture

Cereal Research Communications ◽

10.1556/crc.35.2007.2.139 ◽

2007 ◽

Vol 35 (2) ◽

pp. 721-724 ◽

Cited By ~ 1

Author(s):

Péter László ◽

Miklós Dombos ◽

Csaba Gyuricza

Keyword(s):

Sandy Loam ◽

Conservation Tillage ◽

Sandy Loam Soil ◽

Tillage Systems ◽

Loam Soil ◽

Biological State

Download Full-text

THE INFLUENCE OF TILLAGE SYSTEMS ON THE GROWTH, DEVELOPMENT AND YIELD OF LONG-FLAX

Technical and technological aspects of development and testing of new machinery and technologies for agriculture of Ukraine ◽

10.31473/2305-5987-2020-2-27(41)-20 ◽

2020 ◽

Author(s):

V. Dumych ◽

Keyword(s):

Growth And Development ◽

Field Experiments ◽

Conservation Tillage ◽

Mineral Fertilizers ◽

Tillage Systems ◽

Yield And Quality ◽

Tillage System ◽

The Difference ◽

Flax Seeds

The purpose of research: to improve the technology of growing flax in the Western region of Ukraine on the basis of the introduction of systems for minimizing tillage, which will increase the yield of trusts and seeds. Research methods: field, laboratory, visual and comparative calculation method. Research results: Field experiments included the study of three tillage systems (traditional, canning and mulching) and determining their impact on growth and development and yields of trusts and flax seeds. The traditional tillage system included the following operations: plowing with a reversible plow to a depth of 27 cm, cultivation with simultaneous harrowing and pre-sowing tillage. The conservation system is based on deep shelfless loosening of the soil and provided for chiseling to a depth of 40 cm, disking to a depth of 15 cm, cultivation with simultaneous harrowing, pre-sowing tillage. During the implementation of the mulching system, disking to a depth of 15 cm, cultivation with simultaneous harrowing and pre-sowing tillage with a combined unit was carried out. Tillage implements and machines were used to perform tillage operations: disc harrow BDVP-3,6, reversible plow PON-5/4, chisel PCh-3, cultivator KPSP-4, pre-sowing tillage unit LK-4. The SZ-3,6 ASTPA grain seeder was used for sowing long flax of the Kamenyar variety. Simultaneously with the sowing of flax seeds, local application of mineral fertilizers (nitroammophoska 2 c/ha) was carried out. The application of conservation tillage allows to obtain the yield of flax trust at the level of 3,5 t/ha, which is 0,4 t/ha (12.9 %) more than from the area of traditional tillage and 0,7 t/ha (25 %) in comparison with mulching. In the area with canning treatment, the seed yield was the highest and amounted to 0,64 t/ha. The difference between this option and traditional and mulching tillage reaches 0,06 t/ha (10,3 %) and 0.10 t/ha (18.5 %), respectively. Conclusions. Preservation tillage, which is based on shelf-free tillage to a depth of 40 cm and disking to a depth of 15 cm has a positive effect on plant growth and development, yield and quality of flax.

Download Full-text