Four Primary PGCE students in Group D (Jenny, Emma L, Charlene and Chloe) track the progress of broad beans’ growth as part of a science project. Currently, we’re waiting for the seeds to germinate…
Our aim is to see if the growth of broad beans is affected by the liquid it’s grown in. In our experiment we will compare the growth of a control bean (grown in water) against a bean grown in a salt solution, a sugar solution and a tea solution.
We predict that the changes in the water solution fed to the bean (i.e. the things we have added to it) will affect the way that the bean grows.
More specifically, we predict that the salt will have an adverse affect on bean growth, and that this bean will either die or become sickly as a result of the changes to the water. I suspect that this may be due to the fact that salt dehydrates.
We predict that the tea and sugar beans will survive, but that the solutions may have some impact on their growth rates, health and colour. We hope to find out whether the effects will be positive or negative through the experiment.
The control bean will grow as normally expected and will provide a good comparative with the other beans.
The group has decided that whilst germination takes place we will water the beans as normal. This means that we will water the seed every other day and we agreed as a group how much water to give the seed. Each group member has a plastic cup with a line marked on the cup, this line represents the amount of water that should be given every other day to the seed.
As a group we planted the seeds in the same way, each group member filled a white plastic cup halfway up with soil. We then placed the bean on the soil and filled the plastic cup up the rest of the way. We also agreed that the bean should be kept on a window sill but not near any heating appliances.
Once the seedling sprouts (is visible to the eye) we will begin the experiment. We decided this because we believe that the seeds will sprout at different times. Each group member will continue to water their plant with either: tea, salt water, sugar water and normal tap water. For the salt and sugar solutions – one teaspoon of either salt or sugar will be added to the agreed water amount. We will water the plant every other day as before.
Each day we will measure the growth of the bean. We will measure the bean from the top of the soil using a mm ruler. The group has decided that we will do this for eight days, day one will be when the plant is visible. We will record our results on a table. Once all group members have their results we shall compare findings.
These pictures show the beans before they were planted. They were all healthy normal beans before the start of the experiment. We each had our own plastic cup were we planted the beans.
Day 1: Planted bean in soil and agreed with group amount of water to be added every other day. Watered seed today-here goes!
Day 3: Seed has germinated! Added second amount of water today. Was quite exciting to see something sprout from the soil. Hopefully as the control plant, mine will grow quickly and healthily!
Day 5: Plant is growing quickly. It has healthy looking green leaves and appears to be growing quite straight. It is now 70mm tall….Success!
Day 7: Plant seems to have stopped growing for some reason, or else is not growing as quickly. (80mm)Am not sure why this is, think I may have overwatered it the other day. Am now quite worried that plant will stop growing/die. Added slightly less water today just in case.
Day 9: Control bean is back on track-it has grown quite a bit over the last 2 days and sprouted a few more leaves. It is now 130mm tall. It still looks healthy and strong. I am relieved!
Day 11: This plant is growing very rapidly…I may have to remove it from my windowsill in order to see out the window! It is now 175mm in height and full of leaves. Obviously, the combination of regular water and sunlight has done the trick- I wonder how the other beans have fared with salty water and tea, etc!
Day 13: The bean plant is now at the majestic height of 200mm (more or less-there are leaves poking out everywhere!) It is perfectly green, straight, strong and healthy. As this is our control bean, I am delighted that it has sprouted and grown so uneventfully, apart from the slight hiccup in Day 7! I feel quite proud of my plant!
My bean has germinated too! It is about 2.5 cm long and has also grown towards the light. I will begin feeding it a salty diet as of today.
Interestingly, though an aside from the main experiment, the first salt bean that I mistakenly fed salt water to from the start, never germinated. The seed is pulpy and colourless. This might help confirm our predictions for the new salt bean…