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    Q68. Does drought kill off soil organisms?

    Drought doesn’t kill all soil organisms—many survive by entering dormant states and quickly rebound after rain if food, moisture, and temperature conditions are favourable.

    Q65. Why do sandier soils sometimes perform better than heavier soils?

    Sandier soils can outperform heavier soils by making better use of light rains and offering more plant-available water, especially when underlain by clay subsoil for

    Q63. Will leaving stubble standing or slashing it to act as a mulch preserve more soil moisture?

    Standing or slashed stubble doesn’t significantly change moisture conservation, but maintaining anchored stubble roots helps stabilise soil structure and improves water infiltration.

    Q62. How much soil moisture does a weed-free paddock really conserve (compared with a weedy paddock) over summer?

    Keeping paddocks weed-free over summer significantly conserves soil moisture, with research indicating potential savings of up to 86 mm compared to weedy paddocks.

    Q60. Does fire create water repellent soil?

    Intense fires (>300°C) can increase soil repellence by pushing organic matter deeper, while cooler stubble burns may reduce repellence but at the cost of beneficial

    Q51. Why is repellence ‘better’ in wet years?

    Soil repellence appears reduced in wet years because increased moisture weakens hydrophobic bonds, allowing water to infiltrate more easily, but repellence returns when the soil

    Q53. Why is crop establishment worse on water repellent sand when sown dry?

    Crop establishment is poorer on dry-sown water repellent sands because dry sowing disrupts natural water entry paths and funnels more repellent soil into seed furrows,

    Q52. How deep is the repellent soil layer?

    Water repellent soil typically occurs in the top 10–15 cm, usually strongest between 2–5 cm depth, but can start slightly below the surface in bare

    Q55. How do wetting agents work?

    Wetting agents reduce water repellence by lowering surface tension (penetrants) and retaining moisture near roots (humectants), with best results from seed-zone application on stable furrows;

    Q50. Why do soils become water repellent?

    Soils become water repellent when organic compounds from plant residues, animal manure, and microbes coat soil particles, especially under dry conditions that slow their breakdown.

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