Soil Neutralizer is a product that lowers the soil pH levels through a chemical ion exchange. Studies have shown that increased calcium strengthens plant stems and decreases susceptibility to several plant diseases as a result of a lower pH soil environment (Alberta,Ward Chemical). Soil acidity problems are increasing in areas of Nebraska because of continuous cropping and use of acidifying fertilizers. Soil acidity problems develop slowly, with acidification occurring much faster on sandy soils than on fine textured soils. Soil acidity may be reduced with lime application,but distance from the lime source can make this a costly option. Adopting practices to reduce the rate of soil acidification may be economical for many producers.
Neutralization of soil is sometimes necessary in order to promote plant growth. The ability of plants to take nutrients from the soil into their roots is affected by the pH content of the surrounding soil particles. Acid rain can cause soil to become acidic. Some plants benefit from liming the soil. In the liming process, agricultural limestone-calcium carbonate (CaCO3) that may also contain magnesium carbonate (MgCO3) neutralizes acid in the soil and provides nutrients to promote plant growth. Since liming can stimulate plant growth, it is important to also fertilize limed soil. This insures that all of the nutrients used by the plants for growth are maintained in the soil for the following year’s growth. Soils may also become too basic, or alkaline, especially in areas where there is little precipitation. Substances that can act as acids such as calcium sulfate, also called gypsum (CaSO4), and sulfur (S2) can be applied to the soil for neutralization(Haustein,Uses of soil neutralization).Liming is the application (to soil) of calcium- and magnesium-rich materials in various forms, including marl, chalk, limestone, or hydrated lime. In acid soils, these materials react as a base and neutralize soil acidity. The two types of lime that gardeners should become familiar with are agricultural lime and dolomite lime. Both types of lime contain calcium, and dolomite lime also contains magnesium. Lime adds these two essential elements to the soil, but it is more commonly used to correct the soil pH. Agricultural lime, also called aglime, agricultural limestone, garden lime or liming, is a soil additive made from pulverized limestone or chalk.While, Dolomitic lime is an attractive rock. It’s calcium magnesium carbonate. It has about 50% calcium carbonate and 40% magnesium carbonate, giving approximately 22% calcium and at least 11% magnesium.It is certainly allowed in organic gardening(Nauta,Smiling Gardener).But Agricultural Limes are more used and commercially popular.Because it Improves the physical, chemical and biological properties of the soil, Promotes better nitrogen fixation by legumes,Increasing the availability of nutrients to plants,Reducing the toxicities in the soil,Enhancing the effectiveness of some herbicidesSupplies calcium, magnesium and other minerals to crops(Staff,2017).
Spent mushroom substrate as one of the main focus of this study is the soil-like material remaining after a crop of mushrooms. Spent substrate is high in organic matter making it desirable for use as a soil amendment or soil conditioner (Beyer,Spent mushroom substrate). Spent substrate adds organic matter and structure to the soil. Spent substrate primarily improves soil structure and it does provide a few nutrients. Spent substrate is the choice ingredient by those companies making the potting mixtures sold in supermarkets or garden centers.The researcher also focuses on the use of oyster mushroom as the kind of spent mushroom to be used.It is widely studied as it has flavour and contains nutritional and medicinal properties. As nutrient source of protein, carbohydrates, vitamins, calcium and iron, it can be used in a variety of applications (Corrêa et al., 2016). For instance, oyster mushroom can be used for medical purposes which can increase the immune power of our body against diseases. Therefore, it can be used as a dietary supplement (Khatun et al., 2015).
Shrimp shells are also one of the main focus of this study to neutralize the soil. The term shrimp is used to refer to some decapod crustaceans, although the exact animals covered can vary. Shrimp’s waste(dried head or shell) was found to have high protein content and high level of minerals especially Ca,P,Na and Zn.It is free from aflatoxins (B1,B2,G1 ; G2) concentrations.Shrimp’s shell were found to contain high values of macro elements and rare values of micro elements.It is also highly demanded globally due to its nutritional values.
With these ideas,the researcher decided to come up with a study that will determine the effectiveness of Spent oyster mushroom(Pleurotus ostreatus) substrate and shrimp shells as soil neutralizer.


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