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51.  Amorphous aluminosilicate minerals like allophane have ______ negative charge, which is partly or entirely balanced by complex aluminium cation:
A. Small B. Zero
C. Large D. None of these

52.  Snaerobic environment in paddy soil is responsible for gaseous loss of fertilizer nitrogen by:
A. Denitrification B. Volatilization
C. Nitrification D. Ammonification

53.  Application of nitrogen in cowpea at the time of planting is known as:
A. Basic dose B. Synergistic dose
C. Starter dose D. Additional dose

54.  Application of propanil after ______ in rice-paddies causes prohibitive vegetative injury:
A. DDT B. Endosulfan
C. Carbofuran D. Sevin

55.  Application of urea, aqua-ammonia, anhydrous ammonia and diammonium phosphate form alkaline microsite at the point of application, and in rice ______ encourage the taking up of nitrite:
A. High NH4+ concentration B. High pH
C. Both of these D. None of these

56.  Area required for raising seedlings for one-hectare normal sown crop of paddy:
A. 250 sq meter B. 500 sq meter
C. 750 sq meter D. 1000 sq meter

57.  Arhar (pigeon pea) is commonly known as:
A. Red gram B. Black gram
C. Bengal gram D. Green gram

58.  As per principles of crop rotation pulses should be included in rotation because:
A. They increase total pulse production B. They release land quickly for the second crop
C. They help in maintenance of soil fertility D. They increase the yield of succeeding cereal crop

59.  Which portion of sugarcane stalk is preferred for sowing purposes?
A. Top one-third to half portion B. Top one-fourth portion
C. Bottom one-fourth portion D. Bottom on - third to half portion

60.  At pH ______ H+ ion toxicity is lessened by the removal of these ions:
A. 4.5 or less B. 5.5 or less
C. 6.0 or less D. 5.0 or less




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