(a) Define the term nursery as used in crop production[2marks] (b) Give three reasons for establishing a nursery in crop production.[3marks] (c) Mention thr...
Question 1 Report
(a) Define the term nursery as used in crop production[2marks]
(b) Give three reasons for establishing a nursery in crop production.[3marks]
(c) Mention three characteristics of weeds that make them difficult to control [3marks]
(d) List two methods of controlling weeds.[2marks]
(e)State three ways by which diseases are spread among crops [3marks]
(f) Mention three effects of diseases on crops [3marks]
Answer Details
(a) Nursery
A nursery is a specially prepared bed or place where seeds are sown and young seedlings are raised and cared for before they are transplanted to the permanent field.
(b) Three reasons for establishing a nursery
- It allows easy and close care/management of the young seedlings.
- It enables the farmer to select only healthy and vigorous seedlings for transplanting.
- It gives the seedlings a head start while the permanent land is being prepared, and helps economize on seeds.
(c) Three characteristics of weeds that make them difficult to control
- They produce large numbers of seeds with long viability and dormancy.
- They propagate vegetatively through rhizomes, stolons and suckers.
- They have rapid growth rates and their seeds are easily dispersed.
(d) Two methods of controlling weeds
- Cultural/mechanical control (hand weeding, hoeing, mulching, cover cropping).
- Chemical control using herbicides.
(e) Three ways by which diseases are spread among crops
- Through wind.
- Through water (rain splash and irrigation water).
- Through insect vectors, infected planting materials and contaminated tools.
(f) Three effects of diseases on crops
- They reduce crop yield.
- They lower the quality and market value of produce.
- They may cause the death of the plants.
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