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2004 WAEC Agricultural Science Practical (a) Give the botanical name of each of specimens I (Common wireweed) J (coatbuttons), K (Giant...

Agricultural Science
WAEC 2004

(a) Give the botanical name of each of specimens I (Common wireweed) J (coatbuttons), K (Giant star grass), and L (cogongrass)

(b) Describe Specimen K

(c) Describe the process of preparing silage from specimen K

(d) Mention two methods for the effective control of specimen L on a farm.

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Explanation

(a) Botanical name of specimens:-

  • I  = Šida acuta,
  • J = Tridax procumbens,
  • K = Cynodon plectostachyum/nlemfluensis/ (specie),
  • L = Imperata cylindrical.

(b) Description of specimen K:

  • short and hardly visíble inter-nodes
  • weak stem
  • leaf sheath covers much of the internodes
  • roots are present at nodes
  • leaves shoot from nodes
  • leaves are long and narrow
  • leaves have parallel venation
  • has adventitious/fibrous roots
  • is a creeping, stoloniferous grass.

(c) Process of preparing silage from specimen K:

  • harvest plant before flowering
  • chop plant into pieces
  • partially wilt chopped material under the sun
  • put wilted material into silage pit
  • compress material well
  • sprinkle a little dilute mineral acid
  • add nitrogen fertilizer e.g. urea
  • repeat the preceding steps until pit is full
  • cover pit to make it air and watertight for a least two/three weeks

(d) Control of specimen L on the farm:

  • deep ploughing to expose rhizomes
  • destruction of exposed rhizomes.

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