41. Who divided the soil forming factors into active & passive?
42. Availability of which micronutrient increases with increase in soil pH
43. On the functional basis Fe, Zn, Mn and Cu have been classified as
44. Sugarbeet is an indicator plant for
45. Among the families of crop plants, the sulphur requirement increases in the order of
46. A soil having bulk density of 1.3 and particle density of 2.65, then the percentage of pore space will be
47. Lowest category of soil classification includes
48. Nitrate nitrogen status in drinking water according to WHO is
49. Which form of mercury is fat soluble, thus most harmful for ecosystem?
50. Diamine putrescine accumulates due to deficiency of
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