Description : . A non-competitive crop requiring weed free period of three or more months a). Maize b). Rice c). Soybean d). Onion
Last Answer : d). Onion
Description : A period in the ontogeny of crop at which maximum crop weed competition occurs is called a). Economic threshold b). Gain threshold c). Competitive threshold d). None
Last Answer : d). None
Description : The competitive crop requiring weed free period of about 3-4 weeks a). Soybean b). Carrot c). Garlic d). Onion
Last Answer : a). Soybean
Description : A curvilinear relationship between weed density and crop yield was reported by a). Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these
Last Answer : b). Roberts and Bonds (1975)
Description : The sigmoidal relationship between weed density and crop yield was proposed by a).Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these
Last Answer : a).Zimdahl 1980
Description : Production practices that influence weed shift are a). Effectiveness of weed management program b). Speed of weed shift occurrence c). Interface areas d). All
Last Answer : d). All
Description : With reference to agriculture, what are Smother Crops ? a Crops that are grown for grazing of harvesting for immediate or future feeding of livestock. b Crops grown to conserve the soil ... season when main crop fails. e Crops whose culture practices allow the infestation of weeds intensively.
Last Answer : e Crops whose culture practices allow the infestation of weeds intensively.
Description : Percent reduction in yield in case of onion due to weeds is a). 20-30 b). 30-35 c). 60-70 d).15-20
Last Answer : c). 60-70
Description : Percent reduction in grain yield of transplanted rice due to weeds is a). 20-40 b).10-30 c).15-20 d).15-45
Last Answer : d).15-45
Description : 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
Last Answer : d). All of these
Description : 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
Description : 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%
Last Answer : a). 55%
Description : Herbicide Antidotes a). protect crop plants b). harm crop plants c). Protect weeds d). Harm weeds
Last Answer : a). protect crop plants
Description : 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
Last Answer : a). Stale seed bed
Description : A practice where one or two flushes of weeds are destroyed before seeding a crop a). Cheeling b). Stale seed bed c). Searing d). None
Last Answer : b). Stale seed bed
Description : Competitive crops such as corn or soybean require weed-free period of a). 2 months b). 3-4 weeks c). 3 months d). None of the above
Last Answer : b). 3-4 weeks
Description : If the yield from weed free is 3500 kg and that from weedy 1500 kg/ha, weed index would be a). 57.1% b). 133.3% c). 45.0% d). 25.6%
Last Answer : a). 57.1%
Description : Competitive ability of the crops in decreas ing order a). barley>rye>wheat >oats b). oats>wheat> rye> barley c). rye>barley>oats> wheat d).wheat>oats>barley >rye
Last Answer : a). barley>rye>wheat >oats
Description : . A shortest time span in the life cycle of a crop when weeding results in highest eco nomic returns a). Economic threshold b). Critical period c). Competitive threshold d). None of these
Last Answer : b). Critical period
Description : If weed population is 70/m2 and the crop 140/ m2, weed intensity would be a). 33.3% b). 66.6% c). 50% d). 73.4%
Last Answer : a). 33.3%
Description : The effective solution to manage weed shifts a). Herbicide combinations b). Herbicide rotations c). Crop rotations d). All
Description : November sown berseem crop induces the weed a). Chenopodium sp b). Anagallis sp c). Vicia sp d). All of these
Description : The official peer-reviewed Journal of the EWRS (European Weed Research Society) is a). Journal of Crop and Weed b). Weed Research c). Weed Science
Last Answer : b). Weed Research
Description : Critical period of crop weed competition in sugarcane is a). 30-40 days b). 30-120 days c). 10-40 days d). 15-30 days
Last Answer : b). 30-120 days
Description : The period at which maximum crop weed competition occurs is a). Critical period b). Dormancy c). Flaming d).Threshold
Last Answer : a). Critical period
Description : Factors affecting weed-crop interference are a). Period of weed growth b). Soil and climate influence c). Plant species effects d). All
Description : Wheat and bajra have critical period of crop-weed competition a).10-20 days b).15-30 days c). 30-45 days d). 20-40 days
Last Answer : c). 30-45 days
Description : Three-phased integrated technology including cutting, spray of glyphosate and land utilization as per its capability for the management of Lantana camara was developed at a). Jabalpur, MP b). Palampur, HP c). Jaipur, Rajesthan d). Hisar, Haryana
Last Answer : b). Palampur, HP
Description : Foundation for phenomenal achievement in modern chemical weed management a). Safeners b). Adjuvants c). Selectivity d). Herbicide combinations e). None
Last Answer : c). Selectivity
Description : With poor weed management, a field could shift to a). Predominant weed species b). Species not effectively controlled c). Species not responded to control meas ures d). All the above
Last Answer : d). All the above
Description : Weed Biology and Management Q.313. Weed Science of America is publish ing which of the Journals a). Weed Science b). Weed Technology c). Invasive Plant Science and Manage ment d). All the above
Description : To control broad-leaved weeds in barley, which of the herbicide is most suitable a). 2,4-D b). Metsulfuron c). Alachlor d). Both a and b
Last Answer : d). Both a and b
Description : Which of the weeds are rapidly controlled by MCPA than 2,4-D a). Nutsedge b). Canada thistle c). Both d). None
Last Answer : c). Both
Description : 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
Last Answer : c). Both a and b
Description : . Which is the widely used herbicide to con trol broadleaved weeds in winter grains? a). 2,4-D b). MCPA c). Both a and b d). Atrazine
Description : Blind hoeing with bullock/tractor drawn spike-tooth harrow successfully controls weeds in a). Potato b). Sugarcane c). Maize d). Both a and b
Description : Industrial weeds can be controlled by using a). Non selective herbicides b). Selective herbicides c). Soil sterilants d). Both a and c
Last Answer : d). Both a and c
Description : In paddy field which of the following con trols weeds effectively? a). Puddling b). Transplanting c). Manuring d). Both a and b
Description : Herbicides are less effective on weeds under which of the soil condition a). Field capacity b). Saturated c). Both a and b d). Dry
Last Answer : d). Dry
Description : Definition of energy management given by cape hart , turner and Kennedy is ____ A. The Judicious and effective use of energy to maximize profits and enhance competitive position B. The Judicious and ... The systematic approach for decision making in area of energy management. D. All of the above
Last Answer : The Judicious and effective use of energy to maximize profits and enhance competitive position
Description : Main objective of production/use of herbicide resistant GM crops is to (a) encourage eco-friendly herbicides (b) reduce herbicide accumulation in food articles for health safety (c) eliminate weeds from ... the use of manual labour (d) eliminate weeds from the field without the use of herbicides
Last Answer : (c) eliminate weeds from the field without the use of manual labour
Description : Which of the following is/ are sustainable agricultural practices? I. Mixed Cropping II. Crop Rotation III. Intercropping IV. Integrated farming Correct code is - a. I, II and III only b. II, III and IV only c. I, III, and IV only d. I, II, III and IV all
Last Answer : d. I, II, III and IV all
Description : With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct? (a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate. ( ... for higher yield. (d) Light saturation for CO2 fixation occurs at 10% of full sunlight.
Last Answer : (b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum
Description : With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? (1) Increasing atmospheric CO 2 concentration up to 0.05% can enhance CO 2 fixation ... for higher yield (4) Light saturation for CO 2 fixation occurs at 10% of full sunlight
Last Answer : (2) C 3 plants respond to higher temperatures with enhanced photosynthesis while C 4 plants have much lower temperature optimum
Description : When the weeds are under pressure, the herbicides enter the leaf a). less readily b). more readily c). do not enter d). entry not affected
Last Answer : a). less readily
Description : Which of the following pre-emergence her bicides can be applied with herbicides that have efficacy with emerged weeds a). Chloracitamide b). Thiocarbamates c). Dinitroanilines d). All
Description : Commonly used chemical fertilizer to con trol submerged weeds and water bloom non -selectively a). Anhydrous ammonia b). Ammonium sulphate c). Ammonium nitrate d). Urea
Last Answer : d). Urea
Description : Present day versatile herbicide to control difficult, perennial, broadleaved weeds and brushes in grasslands a). Alachlor b). Atrazine c). Picloram d). All
Last Answer : c). Picloram
Description : Butachlor has to be applied to control weeds in upland rice at a). Immediately after sowing b). 2 DAS c). 6-8 DAS d). 15 DAS
Last Answer : d). 15 DAS
Description : Which of the weeds make harvesting diffi cult a). Canada thistle b). Cocklebur c). Wild safflower d). All of these