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Plants Nutrients Challenge!
Complete the grid using the words on the board. Challenge: What are fertilisers and what are the problems with using fertilisers?
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Plant and minerals summary
Complete this table of plant mineral needs and deficiencies. Mineral Use in plant Deficiency signs nitrogen phosphorus potassium magnesium
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Complete this table of plant mineral needs and deficiencies.
stunted growth and yellow leaves making roots making chlorophyll yellow leaves with dead spots making flowers and fruits leaves turn yellow from the bottom poor roots and purple leaves making leaves
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Weeds and Pests Lesson Objectives
C/W Date:…………………… Weeds and Pests Lesson Objectives To describe the how weeds impact on plant growth. To explain the problems of using pesticides. Success Criteria List examples of weeds. Name the advantages and disadvantages of using herbicides and pesticides. List the problems of pesticides like DDT.
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Essential Nutrients (mineral salts)
Plant Growth Plants absorb nutrients from soil Plants die 1. Soil Essential Nutrients (mineral salts) * Fertile * Decompose Nutrients returned to the soil
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Soil becomes infertile = No Crops
Crop plants are harvested The plant is removed Soil quality decrease Nutrients decline Soil becomes infertile = No Crops No Decomposition
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What are the problems with plant growth? Weeds Pests
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Name the weeds in the pictures Which plant is not a weed?
What is the man doing?
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What is a weed? Is a plant growing where it is not wanted. E.g. poppies in a field of barley. Weeds compete with other plants for…?
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Weeds are a type of plant that compete with crop plants for; Space
What are weeds? Weeds are a type of plant that compete with crop plants for; Space Water Light Mineral salts
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What impact does this cause??
What are weeds? What impact does this cause?? Fewer resources for crop plants to use for growing Decrease in yield Solution??? Herbicides or weedkillers
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How can we get rid of weeds? Herbicides are used by farmers to kill weed plants. Read through the worksheet ‘Using herbicides’ and answer the questions.
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The New Farmers Guide to Crop Growth
Process of plant growth and decomposition for; Wild Field Farmed Field Why do we need fertilisers? What are they? Types of fertiliser Problems Crop Yield Poster Leaflet The New Farmers Guide to Crop Growth Weeds What are they? How do they affect farming? Solutions: 1. Herbicides or weedkiller. Pests What are they? How do they affect farming? Affects on food chains Solutions?? Chemical: Pesticides Biological Control Problems to crop growth: Weeds Pests
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What are the problems with plant growth? Weeds Pests
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What is a pest?
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Pests Pest = An organism that damages or eats crops that humans grow. Example = ?? Pests limit the number of crop plants in the human food chain. Pests compete with humans for the crops.
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What allows pests to destroy crops quickly?
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Solution to Pests Problems??
Pesticides = A chemical that kills pests Problems?? = Pesticides can affect other organisms in a food web, and may kill useful animals as well as the pests. Solution?? Specific Pesticides
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Complete the worksheet questions
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Insecticides Insecticide Example: DDT
DDT is persistent, where this pesticide does not break down in the environment and passes up food chains. Pests can kill other organisms as well as pests. Poisons can be passed through food chains and get more concentrated at each step.
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Video! What is DDT? Why was it banned in 1972?
What is DDT? Why was it banned in 1972? Why is DDT needed to be used in Africa?
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Negative Negative DDT = Positive DDT = Positive
Saved millions of people from ………….. and starvation. Been used to control the ………………. that spread malaria. Helps to reduce the numbers of …………….. that eat food crops. DDT does not …………. down easily and …………….. in the environment for a long time. It does not break down inside the body of …………….. either. DDT passes along the ………………. chains The pesticide builds up along food chain which is called b…………………... Negative Saved millions of people from ………….. and starvation. Been used to control the ………………. that spread malaria. Helps to reduce the numbers of …………….. that eat food crops. DDT does not …………. down easily and …………….. in the environment for a long time. It does not break down inside the body of …………….. either. DDT passes along the ………………. chains The pesticide builds up along food chain which is called b…………………... Negative DDT = Positive DDT = Positive
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Video! DDT is a very dangerous and effective pesticide that can kill any insect. Positive: Saved millions of people from disease and starvation. Been used to control the mosquitoes that spread malaria. Helps to reduce the numbers of insects that eat food crops.
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Video! Negative: DDT does not break down easily and stays in the environment for a long time. It does not break down inside the body of animal either. DDT passes along the food chains The pesticide builds up along food chain which is called bioaccumulation.
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Quick Recap!
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What is a food chain?
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Food Chains A food chain shows what is eaten by what.
Food Chains and webs begin with energy from the sun. The arrows show which way the energy is going in the chain
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What is a food web?
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Food webs Food webs contain many interlinking food chains.
Challenge Question: What food chains can you see?
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Place the statements in the correct order.
Pesticide Challenge! Cut the statements up. Place the statements in the correct order.
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The New Farmers Guide to Crop Growth
Process of plant growth and decomposition for; Wild Field Farmed Field Why do we need fertilisers? What are they? Types of fertiliser Problems Crop Yield The New Farmers Guide to Crop Growth Weeds What are they? How do they affect farming? Solutions: 1. Herbicides or weedkiller. Pests What are they? How do they affect farming? Affects on food chains Solutions?? Chemical: Pesticides Biological Control Problems to crop growth: Weeds Pests
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Biological Control
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Biological Control What is biological control?
Is an alternative natural method to control pests. It involves using a predator to kill the pest that is eating the plant. The predator is called a biological control agent. Example ?? What would the farmer need to consider?
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Packing Away! 1 2 3 Thank you Stop, Listen and Silence
Pack away your equipment into your bag 3 Stand up, and await dismissal Thank you
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True or False?? OR True False
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Two types of fertiliser are natural and artificial.
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Potassium and Phosphates
Three main mineral salts in fertilisers are Nitrates, Potassium and Phosphates
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has better quality soil
A farmed field has better quality soil
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Weeds compete with the crop plants for space, water, light and mineral salts.
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What method would you use against pests:
a. Chemicals b. Biological methods
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Herbicides kill weed plants
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Are fertilisers a good method to increase crop yield?
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Biological control is an
alternative method of controlling pests.
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