Some physical properties of structural aggregates separated from organic waste-amended soils

Application of organic waste on agricultural land as a soil conditioner and fertilizing material has lately gained much attention. This study was conducted to determine the effects of vermicompost applications (0·5%, 1%, 2% and 4% w/w) on physical characteristics of soils with different textures (sandy loam, loam and clay), under laboratory conditions. The results indicated that in the higher soil aggregate fraction (>12·7 mm) aggregate fraction was limited at the three soils. Vermicompost applications in all three soils significantly increased organic matter content. When compared with control, the increasing rates in organic matter content were 14·0%, 23·8%, 42·0% and 90·2% for 0·5%, 1%, 2% and 4% vermicompost application doses, respectively. Vermicompost applications increased the wet aggregate stability and decreased the dispersion ratio of all the experimental soils in all aggregate size fractions. Overall, wet aggregate stability increased from 26·9% to 52·2% with the application rate of 4%. Correlation coefficient between organic matter content and wet aggregate stability was found as 0·918 ** . The lowest mean bulk density and the highest mean total porosity occurred when the most vermicompost was added. In all the soils studied, the highest permeability coefficients were gained with the application dose of 2%. As a result of increase in wet aggregate stability and decrease in bulk density, air permeability increased, and penetration resistance decreased significantly. The results obtained in this study have clearly indicated that the vermicompost application is an effective way to improve soil physical characteristics.

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“…The higher the OMC and AS values, the lower the DR values. Similar results were reported by Mbagwu & Piccolo (), Gülser () and Opara ().…”

Section: Resultssupporting

confidence: 92%

Effects of Vermicompost Application on Soil Aggregation and Certain Physical Properties

2015

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“…The dispersion ratio (DR): As described by Mbagwu & Piccolo [14] was used as an index of micro aggregate stability. [15].…”

Section: Aggregate Stabilitymentioning

confidence: 99%

Variations in Aggregate Stability and selected Soil Chemical Properties Under Different Land Use Systems in Ikpe Ikot Nkon, Southeastern, Nigeria

Chinyere

2018

ARTOAJ

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The changes in aggregate stability and selected chemical properties of soils under cassava cultivated land, oil palm plantation and rubber plantation were studied in Ikpe Ikot Nkon, Ini local government area, Akwa Ibom State. Results showed that textural class of cassava cultivated land was sandy loam (SL) where as other land use systems were dominated by sandy clay loam (SCL) and clay loam (CL). Total porosity, saturated hydraulic conductivity and infiltration rate showed an inverse relationship with bulk density. Soils under oil palm plantation were significantly (p≤0.05) more porous than the others. The mean weight diameter was highest in oil palm plantation (OP) and significantly different from cassava cultivated land (CS) which had the lowest. At the micro aggregate level, cassava cultivated land (CS) appeared to be better than others. Values for organic matter in cassava cultivated land were lower than others ranging from 21.70 to 25.90g kg -1 where as others were high ranging from 23.40 to 28.30g kg -1 with oil palm plantation recording the highest. The pH of the soil ranged from very strongly acidic to moderately acidic. Sand particles positively correlated significantly with CDI and DR in all the soils and negatively with CFI and ASC. This relationship was reversed for clay and OM contents for CDI, DR, CFI and ASC, respectively. There was a positive significant correlation between OM, clay and MWD in soils from oil palm plantation and rubber plantation, OM was shown to enhance aggregation.

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“…Organic wastes such as farmyard manure, town refuse and sewage sludge (SS) have been applied to the soil by some investigators as soil amendments Mbagwu andPiccolo, 1990 andKhalifa et al, 1994). They reported that these amendments were rich in their content of organic matter and macro and micro nutrients, in addition to their efficiency in improving physical and chemical properties of the soil, thus leading to favorable conditions for better plant growth and greater yields.…”

Section: Khalifa Mr Et Almentioning

confidence: 99%

Effect of Farmyard Manure and Town Refuse Application on Some Soil Properties and Growth, Yield and Fruit Elemental Composition of Pepper

Khalifa

Rabie

Hassan

2000

Journal of Soil Sciences and Agricultural Engineering

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Pot experiments were conducted during the early summer seasons of 1998 and 1999. Farmyard manure (FYM) and town refuse (TR) were applied to the soil in order to study their effects on improving some soil properties and also on growth, yield and elemental composition of bell pepper (Capsicum annum L.) plants. The treatments included the recommended NPK as control in addition to FYM or TR at the rates of 120, 240, or 360 g/pot which contained 12 kg of soil (ca. 10, 20 or 30 tons/fed., respectively, with or without the recommended NPK, and a 1:1 mixture of both amendments at the same rates with added NPK.Soil pH slightly decreased and organic matter (OM) significantly increased with increasing the rate of the different applications of both amendments compared to the control, while soil electrical conductivity (EC) increased, only, at the medium and high rates of different applications. Sodium adsorption ratio (SAR) decreased with increasing the application rate of FYM (whether with or without NPK), but the opposite occurred, generally, with the remaining treatments. FYM at medium and high rate, and the mixture of both amendments at the medium rate with added NPK improved the aggregation parameters of the soil in most cases where mean weight diameter (MWD), water stable aggregates (WSA), optimum size of aggregates and structure coefficient (SC) increased compared to the control.The different applications of both amendments significantly increased the total N and available P, K, Fe, Zn and Cu compared to the control. However, no significant trend was observed between the increase in the amendment application rate and the soil elements content values. Soil Cd content was not significantly affected by the different applications in both years.The different applications of both amendments significantly increased stem length, number of leaves and leaf fresh and dry weights, compared to the control. However, no constant trend was observed between the increase in application rate and the values of these parameters. The largest vegetative growth was obtained with TR at the medium rate with added NPK or the mixture of both amendments at the medium rate with added NPK with slight differences between the two treatments in most measured parameters. Fruit yield per plant and average fruit weight increased with the different applications of both amendments. The yield response was similar to those of growth parameters. TSS % and vitamin C content in fruits were not significantly affected in both seasons.Fruit content of N, P and K increased with most applications of organic amendments compared to the control. The highest contents of these elements were obtained with FYM at the high rate (without NPK). Concerning the concentration of micro elements in fruits, no constant response was observed. The lowest values were obtained with the mixture of both amendments at the medium rate with added NPK.

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Some physical properties of structural aggregates separated from organic waste-amended soils

Cited by 18 publications

References 18 publications

Effects of Vermicompost Application on Soil Aggregation and Certain Physical Properties

Effects of Vermicompost Application on Soil Aggregation and Certain Physical Properties

Variations in Aggregate Stability and selected Soil Chemical Properties Under Different Land Use Systems in Ikpe Ikot Nkon, Southeastern, Nigeria

Effect of Farmyard Manure and Town Refuse Application on Some Soil Properties and Growth, Yield and Fruit Elemental Composition of Pepper

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