Weed Control
Akopọ
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.
Awọn Afojusun
- (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.
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Weed Control. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Weed Control? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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