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Green manure: Quiz


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Question 1: Typically, a green manure crop is grown for a specific period, and then ________ under and incorporated into the soil.
Garden forkPliersPloughBillhook

Question 2: Leguminous green manures such as clover and vetch contain nitrogen-fixing symbiotic ________ in root nodules that fix atmospheric nitrogen in a form that plants can use.
Gram-positive bacteriaBacteriaGram-negative bacteriaCorynebacterium

Question 3: ________ (Mucuna pruriens) Common in the southern US during the early part of the 20th century, before being replaced by soybeans.
Flowering plantMucuna pruriensBufoteninNicotine

Question 4: The ________ systems of some varieties of green manure grow deep in the soil and bring up nutrient resources unavailable to shallower-rooted crops.
Plant stemRootFlowering plantPlant

Question 5: In ________, a green manure is a type of cover crop grown primarily to add nutrients and organic matter to the soil.
Organic farmingAgricultureIntensive farmingSustainable agriculture

Question 6: Some green manure crops, when allowed to ________, provide forage for pollinating insects.
FruitFlowerFlowering plantSeed

Question 7: Green manures increase the percentage of organic matter (________) in the soil, thereby improving water retention, aeration, and other soil characteristics.
BiofuelBiomassEthanol fuelBioenergy

Question 8: Historically, the practice of green manuring can be traced back to the fallow cycle of ________, which was used to allow soils to recover.
Sustainable agricultureAgricultureCrop rotationOrganic farming

Question 9: Common cover crop functions of weed suppression and prevention of soil ________ and compaction are often also taken into account when selecting and using green manures.
Mouth barErosionRiver deltaDune


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