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This study aims to 1). Observe and understand the stages of propagating F2 white oyster mushroom seedlings at Wairita Farm. 2). Compare the growth of F2 white oyster mushroom seedlings between corn cobs and a mixture of corn cobs and wood powder. 3). Improve the skills and add to the experience and knowledge of students so that they can apply the knowledge they have gained in the lecture hall. This study used a comparative descriptive experimental approach, which is to compare the growth of F2 white oyster mushroom (Pleurotus ostreatus) seedlings on two different types of seedling media. This research was conducted at the Wairita Farm in Wairbleler Village, Waigete District, Sikka Regency, East Nusa Tenggara Province, over a period of 7 days (Monday to Sunday) during working hours from 08:00 to 16:30 with a break from 11:30 to 14:00. This location was chosen because it is an agricultural business unit engaged in the cultivation of white oyster mushrooms (Pleurotus ostreatus). The study period was 3 months, from September 17 to November 17, 2025. Independent variables and dependent variables. Data were obtained through direct observation of mycelium growth, daily recording during the incubation period, and visual documentation. The results of this study indicate that the success of white oyster mushroom F2 seedling propagation is greatly influenced by the suitability of the medium to the physiological and ecological characteristics of the mushroom. A mixture of corn bran and wood powder proved to be more suitable and is recommended for use in the propagation of F2 white oyster mushroom seeds compared to pure corn bran media.

The use of Cr (Chromium) in industry and daily life produces toxic waste harmful to humans and the environment. This study aims to evaluate the effectiveness of activated carbon from corn cobs as an adsorbent for Cr(VI) heavy metal. Corn cobs, which contain 40–44% cellulose, were carbonized at 500°C using 6% sodium carbonate and characterized with an IR spectrophotometer. Adsorption tests were conducted by varying pH and contact time to determine optimal conditions. FTIR results revealed functional groups such as C≡C stretch, C=C=C stretch, and C–O bend. After activation, O–H groups appeared, indicating the presence of aromatic compounds, which are typical in activated carbon. The optimum pH for Cr(VI) adsorption was pH 4, with an adsorption rate of 65.35%. The optimum contact time was 60 minutes, resulting in 3.2% Cr(VI) adsorbed and a maximum adsorption capacity of 0.089 mg/g. In conclusion, corn cobs are a promising, eco-friendly, and effective natural material for adsorbing Cr(VI) heavy metal ions.

Based on the experimental study about corncob conducted before, this village has managed to create a new breakthrough production of processed foods such as corn chips since 2003. The foods that use raw materials of corn is the only one in Probolinggo. Corn chips production as small industries is run by 7 women farmers starting in 2008. (Wahmuda, 2013). The problem of this industrial activity is unbalancing the marketing area with market demand that obstruct continues to increase. This causes decrease on the productivity of the industry. In addition corncob waste left over from a small industrial activities corn chips squashed every day as much as 60 kg. This would be a major obstacle when marketing targets to reach market demand. As a result of waste corn cobs will be more numerous and uncontrolled, even less the corn cob waste is only used as cooking fuel. This research includes experiments on corn cobs process is divided into several stages, namely the process of forming, heating, curing, mixing and merging material, as well as coloring. From the research-based experiments, it turns out corn cobs to have a variety of characteristics. The uniqueness and characteristics process of corncobs, can give some variant forms such as cubes, cylinders, triangles, and a chopped form. Of these forms can be created several patterns of merger between a very interesting form to be used as a hanging lamp shade products. In the manufacture of a hanging lampshade required supporting materials such as iron chandelier hook pipe diameter of 16 mm and an iron plate with a thickness of 3 mm. Innovation alternative these products will continue at the stage of the development process of product design by using corn cobs as raw material products with the hope to utilize more leverage on how to process forms such a way into a useful product in terms of people's needs, aesthetic value and become friendly products environment.

Based on the experimental study about corncob conducted before, this village has managed to create a new breakthrough production of processed foods such as corn chips since 2003. The foods that use raw materials of corn is the only one in Probolinggo. Corn chips production as small industries is run by 7 women farmers starting in 2008. (Wahmuda, 2013). The problem of this industrial activity is unbalancing the marketing area with market demand that obstruct continues to increase. This causes decrease on the productivity of the industry. In addition corncob waste left over from a small industrial activities corn chips squashed every day as much as 60 kg. This would be a major obstacle when marketing targets to reach market demand. As a result of waste corn cobs will be more numerous and uncontrolled, even less the corn cob waste is only used as cooking fuel. This research includes experiments on corn cobs process is divided into several stages, namely the process of forming, heating, curing, mixing and merging material, as well as coloring. From the research-based experiments, it turns out corn cobs to have a variety of characteristics. The uniqueness and characteristics process of corncobs, can give some variant forms such as cubes, cylinders, triangles, and a chopped form. Of these forms can be created several patterns of merger between a very interesting form to be used as a hanging lamp shade products. In the manufacture of a hanging lampshade required supporting materials such as iron chandelier hook pipe diameter of 16 mm and an iron plate with a thickness of 3 mm. Innovation alternative these products will continue at the stage of the development process of product design by using corn cobs as raw material products with the hope to utilize more leverage on how to process forms such a way into a useful product in terms of people's needs, aesthetic value and become friendly products environment.