41. Clubroot of crucifers are favoured by soil pH
42. Di-ammonium phosphate contains
43. Witche's broom occurs in
44. The suitable fertiliser for foliar spray is
45. Algae often float on surface of water during day but sink down during night due to
46. Chlorophyll a has
47. Glyricidia species is used as
48. A crop plant which can grow in nitrogen deficient soils without external supply of it is
49. Which of the following herbicides derived from urea?
50. Which toxin was first isolated in pure form?
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