MAJOR MODIFICATION TO EXPERIMENT - VERY IMPORTANT!

Okay. So this is the brainwave that I just came up with: 

For Part A of my experiment, instead of simply investigating the effect of  allelochemicals on vascular and non-vascular plants, I will study the effects of allelochemicals on vascular and non-vascular plants as well as the different types of plants I was going to study in Part B. You see, I will combine both my previous Part A and Part B together.

For Part B of my experiment, I will now investigate the effects of allelochemicals released by sweet potatoes on other sweet potatoes! I came up with this as I was planting my extra sweet potatoes - to use if my official sweet potato failed to grow or something.

Because it seemed that before, my Part A and Part B were basically investigating the same thing - just that Part B was a bit more in-depth. So I have decided to do this!

Furthermore, I think I will begin to observe my sweet potatoes once every two days - because on the note we received before, that detailed what was expected of us in this SRP, said that we were expected to blog at least 3 times a week nearing the end of our experiment. So, in order to be able to blog at least 3 times a week and to blog about information that is actually relevant, I will begin to observe my plants once every two days. 

I know that doing that sounds very obsessive, and I will not have much to blog about in the beginning weeks, but at least that will remind me to keep blogging 3 times a week, you know? At least, although I will be going into almost unnecessary detail, I will be able to keep up with what's happening to my plants. 

Phew. Okay. That was hard.  

Part A of my Experiment [aka: DIE, PLANTS, DIE!!!]

[Note: All allelopathy & allelopathic traits mentioned in this entry are negative, unless mentioned otherwise. Hehe.]

For Part A, I want to investigate IF negative allelopathy actually occurs; and, if so, WHEN and WHERE the allelopathic plant secretes its allelochemicals. I looked up examples of plants that use allelopathy [on Wikipedia, I admit, but also on sites like this one: http://apps.caes.uga.edu/sbof/main/lessonPlan/allelopathy.pdf]; and the plants that use allelopathy include: black walnut trees, sagebrushes and desert shrubs. Thus, it looks like the easiest plants for me to use are either sweet potatoes, alfalfa or sunflowers....perhaps I will use two of the three, to see the effect of two different allelopathic (yes, that is a word. I looked it up.) plants on each other. But I will research more about the different types of allelochemicals they release, and when they release them, before deciding which ones to plant close together.

The next biggest question is: which plants should I test for where the allelochemicals are released? That is, which non-allelopathic plants should I place near the allelopathic ones to see what happens to the non-allelopathic plants? I think I want a range of different plants - I researched modern classifications of plants, and one method of classifying them was by the way the plants took in water - whether they get water from the ground through their roots or simply absorb water through their surfaces (leaves, etc.).

"Plants are either vascular or non-vascular. Vascular plants have tube-like structures that transport water from the roots to the stem to the leaves. Non-vascular plants absorb water only through their surfaces." - Source: http://www.fi.edu/tfi/units/life/classify/classify.html

I believe that it will be helpful to have both a vascular and non-vascular plant that are non-allelopathic so that I can tell whether the allelopathic plant releases its allelochemicals into the ground (in which case the vascular plants would be more affected) or into the air or somewhere else. If the allelochemicals are released into the air, I believe that the non-vascular plant will be more affected by it.

In this case, the independent variable would be if the allelochemicals are actually released. The dependent variable will be the effect on the other plant - how its will growth be impacted on by the allelochemical, and things like that.

I will take observations on the plants every few days, as I said in my last entry....perhaps every 4 days? I'll also take photos, because I want to know when the allelopathic plants start to produce allelochemicals - according to my research, it could be when the plant is actively growing OR even when it's decaying. Does that mean I will have to kill the plants at the end of my experiment and wait until it decays to see the effects of the allelochemicals? I really hope not....that would be really troublesome. =="

BUT I think I will modify my experiment to see when the allelochemicals are released in the lifespan of a plant. That would be better. :D

Since it is March right now, I still have three months to get started on this experiment. It should be enough time.