This document discusses weed management systems for field crops. It outlines different weed management systems including those for small grain crops and row crops. The key components of a weed management system are prevention, mechanical control, cultural control, biological control and chemical control. Prevention involves using weed-free seeds and equipment. Mechanical control involves tillage. Cultural control involves practices like crop rotation. Biological control uses organisms to control weeds. Chemical control can use herbicides that are broad spectrum, selective, contact or systemic. An integrated weed control system combines these different approaches.

2. WEED MANAGEMENT
SYSTEMS FOR FIELD CROPS
Presented to
Prof Dr. Nazim Hussain
Sir Hamid Nawaz
DEPARTMENT OF AGRONOMY

3. Outline
 Weed Management
 Weed Management Systems
 WMS in Field Crops
 Small Grain Crops
 Row Crops
 Preventive Control
 Mechanical Control
 Cultural Control
 Biological Control
 Chemical Control

4. Weed Management ..?
“An environmentally sound system of
farming using all available knowledge
and tools to produce crops free of
economically damaging, competitive
vegetation.”

5. Weed Management Systems
A) Small Grain Crops
B) Row Crops
C) Turf
D) Pasture & Rangelands
E) Perennial Crops
F) Aquatic Weed Sites
Field Crops

6. Weed Management Systems for Crops
Small Grain Crops Row Crops

7. Preventive
Mechanical
Biological
Cultural WEED

8. Weed Management System
Prevention
 Weed Free Crop Seeds.
 Weed Free Manures.
 Clean Harvesting equipments.
 Elimination of Weed infestation in
irrigation water.

9. Mechanical (Small Grain Crops)

10. Mechanical (Row Crops)

11. Cultural Control
 Crop selection
 Rotation
 Variety selection
 Planting date
 Plant population
 Spacing
 Fertility Manipulation
 Mulching

12. Mulching for weed Control
Mulches stop weed growth:
By restricting the penetration of
sunlight to the soil surface
By Releasing Allelopathic
Chemicals.
Reduce the germination of weed
seeds

13. Biological Control
“Use of living organism’s viz., insects, disease organisms, herbivorous fish,
snails or even competitive plants for the control of weeds is called biological
control.”

14. Chemical Control
There are 4 types of herbicides:
Broad Spectrum - these work on a wide variety of weeds.
Selective - these work on a narrow range of weeds.
Contact - these destroy weed tissue at or near the point of contact (they do
not spread around the weed), and require even coverage in their
application.
Systemic - these move through the weed's circulation system, and can be
injected into the weed.

15. In small Grains In Row Crops

16. Integrated Weed Control System

17. Thank you !
Any Question ..?