Module 8: Weeders

Question 1

providing crops the conditions that will make them free of weeds, pests and diseases

Answer 1

crop protection

Question 2

weeds compete with the available ________ and __________ if left uncontrolled

Answer 2

moisture and nutrients

Question 3

if left uncontrolled, pests and diseases multiply above the economic threshold levels

true or false

Answer 3

true

Question 4

most vulnerable period of the crop

Answer 4

growing stage between planting and flowering

Question 5

methods of pest control

Answer 5

• cultural
• ecological
• biological
• physiological
• chemical
• flame
• mechanical

Question 6

methods of pest control

modification of cultural practices such as time of planting and crop rotation

Answer 6

cultural

Question 7

methods of pest control

change in the envi of the crop and the pest which favors the survival of the crop such as flooding to kills insects and weeds

Answer 7

ecological

Question 8

methods of pest control

intro of certain insects which feed on pest, application of chemo-sterilants to render the male sterile, or planting of certain plants whose odor drive pests away

Answer 8

biological

Question 9

methods of pest control

breeding and planting of pest resistant varieties

Answer 9

physiological

Question 10

methods of pest control

application of chemicals to control weeds, pests and diseases

Answer 10

chemical

Question 11

methods of pest control

use of flame for the selective burning of weeds in crops whose stem is not injured by a short exposure to intense heat

Answer 11

flame

Question 12

methods of pest control

use of tools, implements and machines to reduce or eliminate weeds and insects such as in land preparation, cultivation and weeding

Answer 12

mechanical

Question 13

unwanted plans growing in a field competing with the main crop for nutrients, moisture and sunlight

Answer 13

weeds

Question 14

one of the most important crop protection operations

Answer 14

weeding

Question 15

in lowland rice production, weeding is done 1-2 weeks after transplanting

true or false

Answer 15

true

Question 16

weeding is repeated __-__ weeks after 1st weeding

Answer 16

2-3 weeks

Question 17

a serious threat to agricultural crops

Answer 17

weeds

Question 18

negative effects of weeds

Answer 18

• serve as a breeding ground for pests
• compete with the crop for water, sunlight, and nutrients
• yield losses due to uncontrolled weeds alone are significantly high

Question 19

implement/machine used to remove or destroy the weeds from an agricultural land

Answer 19

weeders

Question 20

classification of weeders according to the design of soil working part

Answer 20

1. blade type
2. tine type
3. rotary type

Question 21

classification of weeders according to the design of soil working part

cutting edges sharpened and hardened for soil cutting and weed uprooting

Answer 21

blade type

Question 22

classification of weeders according to the design of soil working part

steel rods sharply pointed and hardened at the soil working end

Answer 22

tine type

Question 23

classification of weeders according to the design of soil working part

curved spikes or paddles attached radially to a common axle which rotates when pushed forward to uproot and bury weeds

Answer 23

rotary type

Question 24

classification of weeders according to power source

Answer 24

1. manually-operated weeders
   a. hand-held weeders
   b. push-type weeders
2. animal-drawn weeders
3. tractor-drawn weeders
4. power weeder

Question 25

classification of weeders according to power source 2 types of manually-operated weeders

Answer 25

1. hand-held weeders 2. push-type weeders

Question 26

classification of weeders according to power source - manually-operated weeders utilize the blade and tine type of soil working parts with short medium and long handles

Answer 26

hand-held weeders

Question 27

sizes of the soil working parts of hand-held weeders

Answer 27

<0.5m ; <1m ; >1m

Question 28

classification of weeders according to power source - manually-operated weeders utilize any three types of soil working parts for upland and lowland weeding

Answer 28

push-type weeders

Question 29

classification of weeders according to power source soil working parts are mounted on a frame or toolbar pulled by animal for upland weeding

Answer 29

animal-drawn weeders

Question 29

classification of weeders according to power source soil working parts are mounted on frame or tool bar pulled by a 2-wheel or 4-wheel tractor for upland weeding

Answer 29

tractor-drawn weeders

Question 30

classification of weeders according to power source rotary type weeder driven by its own engine for lowland weeding

Answer 30

power weeder

Question 31

lowland weeders

Answer 31

- single-row, double rotor, claw weeder - single rotor, claw weeders (2-row & 3-row) - claw paddle weeders (single row & double row) - spin tillers (single row & double row) - cono weeders (single row & double row) - power weeder

Question 32

upland weeders

Answer 32

- peg-type upland weeder - roller weeder - weeding hand tools - scraper wheel toe - wheel cultivator

Question 33

represents the weeding efficiency

Answer 33

weeding index

Question 34

ratio between the no. of weeds removed/destroyed by a weeder to the number originally present in a unit are expressed in percentage

Answer 34

weeding index

Question 35

sampling area when determining weeding index , this is to be selected randomly in the field

Answer 35

1 square meter

Question 36

percentage of plants injured (teared leaves, broken stems and/or uprooted plant during the weeding operation

Answer 36

percent damaged plants

Question 37

indicates the performance of a weeder

Answer 37

performance index

Question 38

this is directly proportional to the are per unit time, the weeding index and the quality of work

Answer 38

performance index

Question 39

performance index is inversely proportional to the power required true or false

Answer 39

true