Study

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This study is summarised as evidence for the following.

Action Category

Crop production: Use no tillage in arable fields

Action Link
Mediterranean Farmland

Soil: Use no tillage in arable fields

Action Link
Mediterranean Farmland
  1. Crop production: Use no tillage in arable fields

    A replicated, randomized, controlled study in 1986–2008 in a rainfed wheat field in southern Spain found that tillage had inconsistent effects on crop yields. Crop yield: Higher wheat yields were found in plots with no tillage, compared to conventional tillage, in two of five comparisons (3,482–4,698 vs 2,463–3,926 kg/ha), but lower yields were found in one of five comparisons (4,571 vs 5,216 kg/ha). Methods: No tillage or conventional tillage was used on three plots each (five subplots/plot, 10 x 5 m subplots, with different wheat rotations). Mouldboard ploughing, disk harrowing, and/or vibrating tine cultivation was used for conventional tillage (depth not reported). Pre-emergence herbicide was used for no tillage. The wheat phase was fertilized with nitrogen in some sub-subplots (0–150 kg N/ha/year) and phosphorus in all plots (65 kg P/ha/year). Crop residues were retained. Wheat yields were measured in 2008.

     

  2. Soil: Use no tillage in arable fields

    A replicated, randomized, controlled study in 1986–2008 in a rainfed wheat field in southern Spain (same study as (27)) found more organic matter and nitrogen in soils with no tillage, compared to conventional tillage. Organic matter: More organic carbon was found in soils with no tillage, compared to conventional tillage, in two of five comparisons (772–815 vs 684–699 g/m2). Nutrients: More nitrogen was found in soils with no tillage, compared to conventional tillage, in 10 of 20 comparisons (50–180 vs 30–150 g total N/m2). Methods: No tillage or conventional tillage was used on three plots each (five subplots/plot, 10 x 5 m subplots, with different wheat rotations). Mouldboard ploughing, disk harrowing, and/or vibrating tine cultivation was used for conventional tillage (depth not reported). Pre-emergence herbicide was used for no tillage. The wheat phase was fertilized with nitrogen in some sub-subplots (0–150 kg N/ha/year) and phosphorus in all plots (65 kg P/ha/year). Crop residues were retained. Soil samples were collected in October 2008 (0–50 cm depth), before tilling the soil and sowing wheat.

     

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