Module:
Agrochemicals and
weed science
Code: PP21
Skill Objectives
Purpose and focus of the Module: The subject aims at providing adequate knowledge and skills on all
aspects of common agrochemicals used in Bhutan. At the end of the course trainees will be fully equipped to use
pesticides safely and judiciously and recommend the right pesticide for a pest or disease. They will also be operate
various pesticide appliances and identify the common weeds associated with the crops.
Unit
Topics / Information
Elements
Credit Hours
CR
Explain the safe uses of
pesticides
Agrochemicals
Carry out maintenance of Spraying
the spray equipments.
equipment
Calculate the dosage of
the chemicals and
prepare spray solutions.
Carry out spray
programes
AS
SS
Introduction to agrochemicals
.5
.5
Advantages and disadvantages of
pesticides
Classification of pesticides
Pesticide formulation
.5
.5
2
.5
2
1
Pesticide toxicity and risk
1
1.5
The pesticide product label
1
.5
Safety precautions
.5
.5
Types of sprayers & function
1
.5
Operation and maintenance of
sprayers
Application of Choice and timing of pesticides
pesticides
Spray calibration
Calculation of chemical dosage
Spray preparation
Spraying techniques
Identify the different agro Common
chemicals and explain
pesticides
their uses.
used in
Bhutan, their
PR
Remarks
Insecticides/acaricides
Fungicides
Rodenticides
.5
.5
1
.5
1
.5
1
2
1
1
1
.5
.5
1
1
3
1
1
0.5
3
1.5
0.5
1
nature and
properties
Herbicides
1
1
Non toxic chemicals and baits
.5
0.5
1.5
1
1.5
1
Good management practices in
pesticide use
Identify the different types Weed science Biology and classification of
of weeds infesting various
common weeds of crops
crops and recommend
Collection & identification of
appropriate control
common weeds,
measures
Preparation of weed herbarium
1.5
.5
1
3
General methods of weed control
(cultural control methods)
1
1.5
1
Uses of herbicides in weed control
2
1.5
1
19.5
13
9
18.5
60
Module :
Plant Protection (PP21)
Programme:
Diploma in Agriculture
Credit Value:
60 Credit hours (6 Credit Points)
Staff member (s) responsible:
Dr. Jamba Gyeltshen
General Objectives: The subject aims at making the trainees fully acquainted with the various agrochemicals used for crop
protection in Bhutan and weed management.
Learning outcomes: The module conducted in first semester second year and by the end of the module the trainees will be
able:
o Explain the benefits and risk associated with use of pesticides in crop production.
o Use and undertake necessary safety precautions while handling pesticides.
o Operate and maintain common pesticide spraying equipments
o Calibrate a sprayer and prepare spray solution
o Apply pesticides depending on type of pesticide, time and weather condition
o List down the common pesticides used in Bhutan
o Identify the common weeds and recommend appropriate control measures.
Skills
Learning and Teaching approaches: There will be 19.5 hrs of class room teaching which includes both lectures and group
work that constitute the main approach complemented further by 13 hrs of practical training. Practical training will be conducted
at CNR Agriculture farm and lab. Students will have to allocate 9 hours for assignments and 18.5 Hours for self-study.
Assessment: Assessment is carried out both as an ongoing process, which constitutes 60% weight of the total marks and final
written exam, which constitutes 40%. Continuous assessment will be marked through two written exam for 20% each and two
assignment of 10% each.
Subject Matter: It aims at providing adequate skills for managing pest and disease of field and horticultural crops using
pesticides. It deals common pesticides used in Bhutan, safety precautions while handling pesticides, calculation of dosage and
preparations of spray solution. The module also covers calibrations of sprayers and techniques of spraying. Identification of
common weeds and their management is also covered in this module.
Reading list:
1: Nene, Y.L. 1971. Fungicides in plant disease control. 3rd ed. Oxford and IBH publishing. New Delhi.
2: Singh, S.S. Hand book of Agricultural Science. Kalyani Publishers. India
3: ADB. Hand Book on the use of pesticides in the Asia Pacific region. Phillipines
4: Parker, Chris. Weeds of Bhutan.
5: Gupta, O.P. Modern Weed Management. Agro Botanica. India
6: http://www.agric.gov.ab.ca/app23/pesticides/insecticides/getcrop.jsp
7: http://pmep.cce.cornell.edu/profiles/index.htm