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Fertilisers Give one, get one – what do you know about fertilisers? Watch the following clip about... Fertilisers – name the 3 minerals found in fertilisers? - What two methods are used on this organic farm instead? Fertilisers Fertilisers contain nitrogen (N), phosphorus (P) and potassium (K). The absence of any of these minerals will reduce growth in the plant. Each packet has a ratio which needs to be simplified to a whole number ratio... Miragrow Excellent for leafy green grass and veg. NPK ratio 14:6:2 Each packet has a ratio which needs to be simplified to a whole number ratio... Supergrow The number one fertiliser for fruit trees and flowers. NPK ratio 27-3-9 Each packet has a ratio which needs to be simplified to a whole number ratio... Greengrow Growing potatoes? This is the fertiliser for you!! NPK ratio 4-36-12 Fertilisers • Natural fertilisers include spreading manure and growing clover in the fields. • Artificial fertilisers are chemicals. Fertilisers Natural Artificial Less Pollution Low cost Likely to cause pollution in water courses. High cost. NPK composition is variable. Composition more reliable. What do you think causes this? Watch the following clip about... How do fertilisers cause algal blooms? Put these in order... 1. Chemicals leach into water 2. Fish die 3. Overuse of fertilisers 4. Oxygen levels decrease 5. Algal bloom develops Today we will be learning about… • The steps of the Nitrogen Cycle. • How feedback can help to improve our learning. Mind map Create a mind map showing what you already know about feedback. The Nitrogen Cycle Watch the following clip about the nitrogen cycle and create a sequence of the main steps. Time for feedback! • Your partner will give you feedback on how to improve your sequence. • Act on the feedback you have received. Nitrogen gas in the air Nitrogen fixation (by bacteria) Dentrification by bacteria Nitrogen fixation (by bacteria) Nitrogen in plants (protein) Nitrogen in animals (protein) Animal Nutrition Absorption by roots START HERE Excretion and death Nitrogen in Nitrogen in nitrates in the soil Nitrification by bacteria waste and dead bodies (e.g. urine) Decomposition by bacteria Death Nitrogen in nitrites in the soil Nitrification by bacteria Nitrogen in ammonium compounds in soil Now try the card sort... Time for feedback! • Your partner will give you oral feedback on how to improve your sequence. • Be kind, helpful and specific. • Act on the feedback you have received.
