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Multiple comparison of the effects of wetting treatment, aggregate size and soil on fragment-size distribution (FSD), mean weight diameter (MWD) and normalised mean weight diameter (NMWD) SW =slow wetting; WS = wet stirring; FW = fast wetting; B = big aggregate size; M = medium aggregate size; S = small aggregate size. Letter followed the values indicate the significance at the 0.05 probability level.

Table 4 Multiple comparison of the effects of wetting treatment, aggregate size and soil on fragment-size distribution (FSD), mean weight diameter (MWD) and normalised mean weight diameter (NMWD) SW =slow wetting; WS = wet stirring; FW = fast wetting; B = big aggregate size; M = medium aggregate size; S = small aggregate size. Letter followed the values indicate the significance at the 0.05 probability level.

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Description of taxonomic classification, parent material, soil sampling site, clay minerals and land-use EERSRS = the Ecological Experimental Research Station of Red Soil.
Description of taxonomic classification, parent material, soil sampling site, clay minerals and land-use EERSRS = the Ecological Experimental Research Station of Red Soil.
Selected physical and chemical properties of the soils studied Gravel (> 2 mm), sand (2-0.05 mm), silt (0.05- 0.002 mm), clay (< 0.002 mm); SOC = soil organic carbon; CEC = cation-exchange capacity.
Selected physical and chemical properties of the soils studied Gravel (> 2 mm), sand (2-0.05 mm), silt (0.05- 0.002 mm), clay (< 0.002 mm); SOC = soil organic carbon; CEC = cation-exchange capacity.
Aggregate stability measured by the dry- and wet-sieve method and microaggregate stability of the soils studied MWD = mean weight diameter; MWD ay - wet = difference between dry sieving and wet sieving; PAD = percentage aggregate destruction; DOA = degree of micro-aggregation.
Aggregate stability measured by the dry- and wet-sieve method and microaggregate stability of the soils studied MWD = mean weight diameter; MWD ay - wet = difference between dry sieving and wet sieving; PAD = percentage aggregate destruction; DOA = degree of micro-aggregation.
Relative slaking index (RSI) and relative mechanical breakdown index (RMI) by the Le Bissonnais method
Relative slaking index (RSI) and relative mechanical breakdown index (RMI) by the Le Bissonnais method
Correlation coefficients for the linear relationships between the parameters of aggregate stability in different treatments FW = fast wetting; MB = mechanical breakdown; SW = slow wetting; RMI =relative mechanical breakdown index; RSI = relative slakinginde MWD = mean weight diameter (mm); NMWD = normalized mean weight diameter; PAD = percentage of aggregate destruction. Values followed FW, WS, SW, RMI, or RSI indicate the aggregate sizes, namely, 21 = aggregates from 2-1 mm. 32 = aggregates from 3-2 mm a 53 = aggregates from 5-3 mm. Ns = not significant. * Significant at 0.05 level. Ee et ent ot TE PPT benrel
Correlation coefficients for the linear relationships between the parameters of aggregate stability in different treatments FW = fast wetting; MB = mechanical breakdown; SW = slow wetting; RMI =relative mechanical breakdown index; RSI = relative slakinginde MWD = mean weight diameter (mm); NMWD = normalized mean weight diameter; PAD = percentage of aggregate destruction. Values followed FW, WS, SW, RMI, or RSI indicate the aggregate sizes, namely, 21 = aggregates from 2-1 mm. 32 = aggregates from 3-2 mm a 53 = aggregates from 5-3 mm. Ns = not significant. * Significant at 0.05 level. Ee et ent ot TE PPT benrel
Correlation coefficients for the linear relationships between the parameters of aggregate stability and the soil properties SOC = soil organic carbon; CEC = cation-exchange capacity; DOA = degree of micro-aggregation; MWD = mean weight diameter (mm); NMWD = normalized mean weic diameter, PAD = percentage of aggregate destruction. FW = fast wetting; WS = wet stining; SW = slow wetting. RMI = relative mechanical breakdown index; RSI = relative slaki index; Values followed FW, MB or SW indicate the aggregate sizes, namely, 21 = aggregates from 2 to 1 mm, 32 = aggregates from 3 to 2 mm and 53 = aggregates from 5 to 3 mi *Soil organic carbon (SOC) exlcuding Pp and Qp. PK.O excluding Pc and Pp. “ Significant at 0.05 level. *“ Significant at 0.01 level.
Correlation coefficients for the linear relationships between the parameters of aggregate stability and the soil properties SOC = soil organic carbon; CEC = cation-exchange capacity; DOA = degree of micro-aggregation; MWD = mean weight diameter (mm); NMWD = normalized mean weic diameter, PAD = percentage of aggregate destruction. FW = fast wetting; WS = wet stining; SW = slow wetting. RMI = relative mechanical breakdown index; RSI = relative slaki index; Values followed FW, MB or SW indicate the aggregate sizes, namely, 21 = aggregates from 2 to 1 mm, 32 = aggregates from 3 to 2 mm and 53 = aggregates from 5 to 3 mi *Soil organic carbon (SOC) exlcuding Pp and Qp. PK.O excluding Pc and Pp. “ Significant at 0.05 level. *“ Significant at 0.01 level.
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Mean Weight DiameterSoil Aggregation
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