This question was not satisfactorily answered by the candidates. In 5(a)(I), most of the candidates could define crop rotation. In 5(a)(ii), majority of the candidates could not design a 4-year crop rotation system using yam, cassava, maize and groundnut.
Design of a 4 - year crop rotation system using yam, cassava, maize and groundnut
In 5(b) and (c), many candidates could state the reasons why weeds are difficult to control and mention the effects of diseases on crop production
