Biological weed control is not successful because a). Not possible to eradicate weed b). Bioagents are weed specific c). Controlled only introduced weeds d). All of these

Biological weed control is not successful  because
a). Not possible to eradicate weed
b). Bioagents are weed specific
c). Controlled only introduced weeds
d). All of these
by

1 Answer

Answer :

d). All of these
by

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An eradication method of weed control a). Killing underground parts of weeds by tillage b). Using soil sterilants c). Repeated foliar application on perennial weeds d). All of these

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Weed intensity if number of weeds is 110/m2 and wheat plants are 90/m2. a). 55% b). 110% c). 22.5% d). 77.5%

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4. Reverse metabolism induce the suscepti bility to weeds by a). 2,4-D b). MCPA c). Both a and b d). None of these

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In paddy field which of the following con trols weeds effectively? a). Puddling b). Transplanting c). Manuring d). Both a and b

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Herbicides are less effective on weeds under which of the soil condition a). Field capacity b). Saturated c). Both a and b d). Dry

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Generally weeds seeds are abundant at a depth of a). 1.0-1.5cm b). 5 cm c).10cm d).15cm

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One to two flushes of weeds are destroyed before planting of crop is called a). Stale seed bed b). Blind hoeing c). Weeding d). Summer ploughing

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Percent reduction in yield in case of onion due to weeds is a). 20-30 b). 30-35 c). 60-70 d).15-20

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Percent reduction in grain yield of transplanted rice due to weeds is a). 20-40 b).10-30 c).15-20 d).15-45

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Striga densiflora and Orobanche aegyptica are the weeds of a). Rice and Wheat b). Sugarcane and Mustard c). Wheat and Sugarcane d). Oats and Rice

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