Effect of Tillage Reduction and Fertilizer on Soil Macro- And Microaggregation

Abstract

(Mazurak 1950) and aggregation index (AI) (Dobranski et al. 1975; MacRae and Mehuys 1987) were then calculated.

Best management practices in Northern agriculture: A twelve-year rotation and soil tillage study in Saguenay–Lac-Saint-Jean

“…2). However, unlike those found in southern Ontario (Yang and Kay, 2001) and Quebec (Weill et al, 1989), ours results revealed that CP does not significantly raise soil organic carbon in the 0-20 cm layer compared to MP (Fig. 2).…”

“…As Angers et al (1993) and Weill et al (1989) found earlier in eastern Canada, compared to MP, CP does not significantly affect mean weight diameter compared to MP after four years of soil tillage treatments. However, as our study showed, CP keeps more stable aggregates and greater mean weight diameters after eight years and differences even increase after twelve years (Fig.…”

“…Indeed, crops that introduce large amounts of carbon in the soil (as roots and straw) tend to form highly stable soil aggregates (Angers and Caron, 1998;Angers and Mehuys, 1990;Carter, 1992;Weill et al, 1989).…”

Early changes in water-stable aggregation induced by rotation and tillage in a soil under barley production

“…l). Angers and Mehuys (1988) and Perthis site for 5 yr prior to the initiation of the fect et al (1990) Weill et al (1989) and MWD was shown for each tillage treatment Raimbault and Vyn (l9l) also found little (Fig. a) Smettem et al (1992) also recently observed that aggregate disruption from the escape of compressed air (slaking) was found to have less effect on aggregates from soils under direct drill than from soils under conventional cultivation.…”

Distribution of Organic Carbon, Nitrogen and Phosphorus in Water-Stable Aggregates of Onwu Floodplain Soils, Nigeria.

“…Under no-till practices crop residues are left on soil surface as mulch. Several studies have shown that this practices improve soil aggregation thus reduce soil organic matter and nutrients losses that result from tillage ( Havlin et al, 1990;Carter., 1992;Weill et., 1989 ).Loamy sand floodplain soils of Onwu in northern senatorial district of cross river state, Nigeria are characterized by high dispersibility, a factor that enhances susceptibility of tilled soils to aggregate disruption, surface crusting, poor infiltration and erosion ( Miller and Baharuddin, 1986 ). In tropical climate, these factors can contribute to rapid losses of soil organic matter and a decline in the productivity of agricultural soils ( Gidden, 1957;Bruce et al, 1990b;Sanchez et al, 1989 ).…”