List and describe three advantages of polyculture systems

What will be an ideal response?


1 . Polycultures have greater tolerance to environment and pest stress and provide insurance against total crop failure. Should one of the crops die, other species can still produce yield. This is sometimes called yield stability.
2 . Polycultures of woody crops and pastures in silviculture systems provide for diversification of income by providing short-term and long-term income and products for different markets.
3 . Polycultures with plants of different nutrient needs and rooting characteristics have the potential for greater use of light, water, and nutrient resources and greater overall productivity per acre. Polycultures of nitrogen-fixing legumes with annual or perennial grasses are less dependent on nitrogen fertilizer inputs.

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Which of the following statements is an accurate comparison between diesel engines and gasoline engines?

A) Gasoline engines are heavier.? B) Diesel engines are quieter.? C) Diesel engines produce more power.? D) Gasoline engines have an unpleasant odor.

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What chapter of the text covers all the basic techniques needed to design and build an unlimited number of deck designs?

A) 22 B) 28 C) 14 D) 55

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Technician A says convection may occur in liquids and gases. Technician B says conduction can occur between two substances that are at different temperatures. Who is correct?

A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B

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