Organic fractions, N,
P, and S changes in a semiarid Haplustoll of Argentine under different crop
sequences
Crop
sequences play an important role in changing soil properties. The knowledge of
the chemical composition, turnover, dynamics, and biological effects of
different fractions of soil organic carbon (SOC), nitrogen (N), phosphorus (P)
and sulfur (S) components will result in a better understanding of soil
productivity. The objective of this research was to compare the effects of crop
rotation on SOC, N, P, and S evolution in two granulometric fractions of an
Entic Haplustoll. Rotations of mixed pasture (5.5 years)-annual crops (4.5
years) (Pa-C), and wheat (Triticum aestivum L.)-sunflower (Heliantus annus L.)
(W-S), and a reference (Ref), which was located between them, were studied.
Fine (<100 µm, FF) and coarse (100-2000 µm, CF) soil granulometric fractions
were separated by wet sieving. In each fraction total N and S, and several SOC
and P forms were determined. Similar contents (5.23 to 6.07 Mg ha-1) of humic
acid (HA) carbon were found in the three situations. The Pa-C rotation maintained
the SOC level at 17.33 Mg ha-1 in the Fine Fraction during a 10-year period. On
the contrary, SOC was sharply lower (11.16 Mg ha-1) in the same fraction in the
W-S treatment. Losses of SOC, N, P and S were highest in the Coarse Fraction
thus showing the dynamics of this soil fraction and its important role in plant
nutrient turnover and availability to growing crops.
Galantini
J.A. and R.A. Rosell. 1997. Organic fractions, N, P, and S
changes in a semiarid Haplustoll of Argentine under different crop sequences. Soil
and Tillage Research 42: 221-228.
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