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Agricultural Science Paper 2, Nov/Dec 2008  
Questions: 1 2 3 4 5 6 7 8 9 10 Main
General Comments

Question 3

(a) Explain the following terms as used in soil management:

(i)  maximum tillage;
(ii) zero tillage                                                                                           (4 marks)

(b) State three effects of each of the following farm practices on the soil:

(i)    inorganic fertilizer application;
(ii)   continuous cropping;
(iii)  flooding;
(iv)  bush burning.                                                                                         (12 marks)



This question was fairly attempted by the candidates.  In 3(a) (i and ii), many candidates could not explain maximum tillage and zero tillage.

However, in 3(b), most of the candidates were able to state the effects of farm practices on the soil.

The expected answers include:

(i)         Maximum tillage

This is the practice whereby primary and secondary tillage implements are used to loosen the soil for seed germination and plant growth, e.g. Hoe, Disc plough, Mouldboard plough and harrow.

OR it includes all tillage done on the land which involves loosening up of soil with the use of primary and secondary tillage equipment in the top soil layer e.g. Hoe, Mouldboard ploughs, Disc ploughs, Harrow, Rotovators etc. - Maximum tillage does not enhance soil conservation.

(ii)        Zero tillage

  1. This is the practice of growing crops on unploughed/undisturbed land with no seed bed preparation
  2. Zero tillage enhances soil conservation

-       Weeds are usually controlled by the use of herbicides.

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