Weed Control
Gbogbo ọrọ náà
A weed is simply a plant growing where the farmer does not want it, and that is enough to make it an enemy of the crop. Weeds steal the same light, water, nutrients and root space the crop needs, so a field left unweeded can lose much of its yield long before harvest. Some weeds do worse still: the witchweed Striga actually attaches to the roots of maize and sorghum and feeds on the crop directly.
In this lesson you will meet a named local weed, learn how it harms a crop and how it spreads, and then work through the three routes a farmer can take to control it: cultural, mechanical and chemical. You will learn the difference between selective and non-selective herbicides, when each is used, and how to weigh up the cost, the labour and the risk of pollution so that you can suggest the right method for a given farm.
Ebumnobi
- (a) identify one named local weed species of a crop and describe its harmful effects and the mode of spread.
- (b) explain methods of weed control including cultural, mechanical and chemical methods.
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Weed Control. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which of the following best describes a weed? A. A plant grown for food B. A plant growing where it is not wanted C. A plant that fixes nitrogen D. A plant resistant to herbicides Answer: B
- Striga is a serious weed of maize and sorghum because it: A. Only grows on paths B. Is a parasite that attaches to the crop's roots C. Improves the soil D. Cannot produce seeds Answer: B
- A herbicide that kills certain weeds but not the crop is described as: A. Non-selective B. Systemic C. Selective D. Contact Answer: C
- Which method of weed control is an example of cultural control? A. Hand hoeing B. Spraying a herbicide C. Crop rotation D. Ploughing Answer: C
- A systemic herbicide is more effective than a contact herbicide on a deep-rooted weed because it: A. Works only on the leaves B. Is cheaper C. Is carried through the plant and kills the roots D. Evaporates quickly Answer: C
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Weed Control? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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