(a) Discuss seven economic importance of insect pests in crop production.
(b) Name two hosts of cotton stainer.
(c) List two soil-dwelling insect pests of crops and state five general control measures of insect pests of crops.
Discuss briefly: (a) Temperature; (b) Relative humidity; (c) Light; in relation to poultry production and state two ways of controlling the effect of each.
(a) Write short notes on the following systems of breeding: (i) In-breeding; (ii) Line-breeding; (iii) Cross-breeding
(b) State three methods of collecting semen from a proven male for use in artificial insemination.
(a) State the law of diminishing returns as it applies to agricultural production. [2 marks] Study the table below and use it to answer questions (b) and (c).
|
Size of farm (ha) |
Qty of fertilizer used (bags) | Yield of maize (bags) | Change of Qty of fertilizer |
Change in yield of maize (bags) |
| 2 | 0 | 8 | - | - |
| 2 | 8 | 24 | - | - |
| 2 | 12 | 48 | - | - |
| 2 | 26 | 80 | - | - |
| 2 | 20 | 120 | - | - |
| 2 | 24 | 150 | - | - |
| 2 | 28 | 170 | - | - |
| 2 | 32 | 180 | - | - |
| 2 | 34 | 180 | - | - |
| 2 | 36 | 170 | - | - |
(b) Complete the table above. (c) Draw a graph from the provided data and use it to explain the law of diminishing returns
An agricultural research organisation categorised farmers in village X according to the rate of adoption of new ideas and came up with the following: Innovators 10, Early adopters 15, Late adopters 70, Never adopters 25
(a) Calculate the percentage of early adopters and state the implication of this percentage on the extension system.
(b) Suggest four ways of encouraging the innovators.
(c) State four possible reasons for the high number of late adopters.
(d) State two merits of the print media as a channel for agricultural extension.
