Study

Nitrogen conservation in soil and crop residues as affected by crop rotation and soil disturbance under Mediterranean conditions

  • Published source details de Varennes A., Torres M.O., Cunha-Queda C., Goss M.J. & Carranca C. (2007) Nitrogen conservation in soil and crop residues as affected by crop rotation and soil disturbance under Mediterranean conditions. Biology and Fertility of Soils, 44, 49-58

Actions

This study is summarised as evidence for the following.

Action Category

Crop production: Use crop rotations

Action Link
Mediterranean Farmland

Soil: Use crop rotations

Action Link
Mediterranean Farmland
  1. Crop production: Use crop rotations

    A replicated, randomized, controlled study in 2004–2006 in an occasionally irrigated oat field in Portugal, found similar oat yields in plots with a lupin-oat sequence, compared to an oat-oat sequence. Crop yield: Similar oat yields were found in all plots (4.2 t dry matter/ha). Methods: Oats or white lupins Lupinus albus were grown in six plots each in 2003–2004 (year 1). Oats were grown in all plots in 2004–2005 (year 2). Each plot was 5 x 10 m. Half were tilled (15 cm depth), and half were not (crop residues were retained). All plots were fertilized with phosphorus (60 kg/ha), and oats were also fertilized with nitrogen (100 kg/ha). The seeds were sown in September and the oats were harvested in May.

     

  2. Soil: Use crop rotations

    A replicated, randomized, controlled study in 2004–2006 in an occasionally irrigated oat field in Portugal found less organic matter, phosphorus, and fungi in soils with a lupin-oat sequence, compared to an oat-oat sequence. Organic matter: Less organic carbon was found in soils with a lupin-oat sequence, in one of two comparisons (tilled plots: 6.2 vs 7.7 g/kg). Nutrients: Less phosphorus was found in soils with a lupin-oat sequence, in one of two comparisons (tilled plots: 51 vs 59 mg/kg). Similar amounts of nitrogen, and similar pH levels, were found in soils with both sequences (35–39 vs 41–44 g mineral N/kg, pH 5.2–5.4). Soil organisms: Fewer fungi were found in soils with a lupin-oat sequence (0.0023–0.0034 vs 0.0036–0.0045 colony forming units/g soil), but similar numbers of bacteria were found in both sequences (data not reported). Methods: Oats or white lupins Lupinus albus were grown in six plots each in 2003–2004 (year 1). Oats were grown in all plots in 2004–2005 (year 2). Each plot was 5 x 10 m. Half were tilled (15 cm depth), and half were not (crop residues were retained). All plots were fertilized with phosphorus (60 kg/ha), and oats were also fertilized with nitrogen (100 kg/ha). The seeds were sown in September and the oats were harvested in May. Soil samples were collected in year 2, in October, November, January, March, May, and July (0–15 cm depth). Bacteria and fungi were cultured from soil samples.

     

Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 17

Go to the CE Journal

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust