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questions on crops.

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Question
Answer
show Frost resistant, longer growing season and a higher yield of crops.  
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show it must have a minimum germination rate 85%, a minimum purity rate of 98%, must be treated with fungicide and pesticide and be free of wild oat seed.  
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Identify 4 factors which affect crop production.   show
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Give 2 reasons for the importance of crop rotation.   show
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How can pests and disease of any crop build up in the soil?   show
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show when you plant a different crop each year, it controls pests and weeds because the crops have different pests and weeds.  
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show biological, direct and indirect control.  
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show a non selective herbicide kills all weeds and a selective herbicide only kills one weed.  
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what is a contact herbicide?   show
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what is a translocated herbicide?   show
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what is a residual herbicide?   show
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What is a fungicide?   show
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show contact fungicide and translocated fungicide.  
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three reason a farmer might not use chemicals on a farm?   show
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show infectious bacterial diseases that cause considerable damage to crops.  
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show using natural predators such as the ladybird, using a crop fleece or net  
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show  
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