How do fertilizers affect the pH of the soil?
Effects Soil pH affects the amount of nutrients that are soluble in soil water and, therefore, the amount of nutrient available to plants. Some nutrients are more available under acid conditions while others are more available under alkaline conditions. However, most mineral nutrients are readily available to plants when soil pH is near neutral.
The development of strongly acidic soils (pH less than 5.5) can result in poor plant growth as a result of one or more of the following factors: low pH, aluminum toxicity, manganese toxicity, calcium deficiency, magnesium deficiency, and low levels of essential plant nutrients such as phosphorus and molybdenum MORE iron is more availeble in acidic soils of PH 5.5-6.5. Lots of pottasium fertilizers like KCl can raise PH to 8-9 gypsum can be used to neutralize acidic soil black coffee leftovers can be used to acidify the soil.
Gently put the probe in the soil in the center of the sediment tube. With the probe in the soil, twist the meter back-and-forth so that soil can attach to the probe. Twisting the probe is important to getting accurate measurements.
Wait for 60 seconds. If the pH is above 7, remove the probe, clean it with a new facial tissue or cotton ball, shine it with the green pad, re-insert the probe, and wait for 30 seconds. The measurement you read after 30 seconds is the pH of the soil.
Record this in your lab notebook. If the pH is below 7, remove the probe, clean it with a new facial tissue or cotton ball, do not shine it with the green pad, re-insert the probe, and wait for 30 seconds. The measurement you read after 30 seconds is the pH of the soil.
Record this in your lab notebook. Clean the soil pH meter. Now you will investigate how the pH of water changes after it interacts with the soil samples for 1 hour.
First, add more water to one of the sediment tubes from each site, until the soil is completely saturated and a layer of water about 1 cm deep forms above the surface of the soil. Cap each of the tubes, and securely seal the cap with a piece of duct tape. Mix each of the tubes thoroughly by covering the cap with your hand and then vigorously shaking the tube for one minute.
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