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The Effect Of The Salt Concentration Of Water On The Productivity Of Lupin Plants Over A Fortnight.

916 words - 4 pages

Aim: The effect of the salt concentration of water on the productivity of Lupin plants over a fortnight.Hypothesis: Lupin plants that are watered with more salt will be least productive because an increased salt concentration in the water increases the osmotic gradient, which makes it difficult for plants to absorb water needed for photosynthesis, therefore they will be less productive and will die faster than plants watered with water with a lower salt concentration.Variables:Independent:- The salt concentration of 10mLs of water i.e. 0%, 1%, 2%, 3%, 4%Dependent:- The change in mass of lupin seeds over a fortnight.Fixed:- Light- Temperature- Soil: Following unknown, but they should have been the same for every plant.Structure: dark, moist, smell suggests fertilised, medium-sized granules/ particles/Minerals: Unknown, although manure smell provides evidence for presence of mineralsWater: 10mL/ every two days i.e. 5mL/ day. The soil was damp to start with.Chemicals: unknown.pH: unknown.Amount of soil: 42g of soil every pottle.· Frequency of watering - 10mL every two days (except for over weekends)· Depth that the plant was placed under the soil - in centre of pot with just enough soil to cover seed.· Type of salt - NaCl - given· Type of plant· Volume of water· Length of time allowed for growthApparatus:· Electronic balance· 25 plastic pottles· Small 'spade'· Spoon· 10mL pipette· 50g NaCl· 2500mL tap water· 1050g of soil· Tray· 5 1L yoghurt containers with lids· 25 lupin seeds· 500mL measuring cylinder· Masking tape· Pen· Aluminium foil· Oven· Cylindrical pot with base 5cm in diameter· Cylindrical pot with base 15cm in diameter· VividMethod:1. Mix up five different concentrations of salty water (shown in table) inside the 1L yoghurt container and immediately put lid on to prevent evaporation and hence preventing the increase of the salt in the water.2. Fill 25 pottles with 42g of soil each using an electronic balance and small spade.3. Place one lupin seed inside each centre of the surface of the soil inside each pottle, making sure that the soil just covers the seed.4. Divide pottles into five equal groups (i.e. five pottles a group). Label each group with 0%, 1%, 2%, 3%, 4% respectively.5. Pipette 10mL of the solution indicated on the label into each pottle.6. Arrange the 25 pottles into five equal groups, each consisting of 5 pottles altogether i.e. one of each different concentration of salt. Label each group with A, B, C, D, E.7. Place the groups like in the following diagram to try and ensure that the plants being watered with a solution of a specific concentration of salt receives the same amount of light. Be careful to maintain the positions of these groups over the fortnight.8. Record...

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