Journal La Lifesci

Growth and Yield of Shallot Plants with the Application of Sp-36 Fertilizer and Poc from Red Devil Fish

Yedija Manullang, Revandy Damanik, Mariani Sembiring — Wed, 29 Oct 2025 00:00:00 +0700

Shallots (Allium ascalonicum L.) are one of the horticultural commodities with high economic value and are needed by the community as food. Shallots also contribute to national inflation. Shallots become potential commodity to be developed in the region of North Sumatra, especially in the Toba region. One of the efforts to increase the growth and production of shallot plants can be done by applying SP-36 Fertilizer and Red Devil Fish Liquid Organic Fertilizer. This research aims to determine the best SP-36 and Red Devil Fish Liquid Organic Fertilizer, growth and production of shallots. The research was conducted from September to December 2023 in Lumban Silintong Village, Balige District, Toba Regency, North Sumatra with an altitude of ± 945 m above sea level. The design used was a factorial Randomized Group Design with three replications. The treatments studied were the first factor of SP-36 dose with four levels of treatment (0 (control), 112.5 Kg/Ha, 225 Kg/Ha, 337.5 Kg/Ha and the second factor was the dose of liquid organic fertilizer of red devil fish (0 (control), 3 g/plot, 5 g/plot). The results showed that the provision of SP-36 had a significant effect on the observed variable, namely the fresh weight of plants per plot. Giving Red Devil Fish Liquid Organic Fertilizer can significantly increase plant height, plant fresh weight per plot, plant fresh weight per sample, number of tubers per plot and tuber diameter.

Desain of Multilevel Wall Trap For Selectivity of the Capture Spiny Lobster

Agung Sobri Abdullah, Suharyanto Suharyanto, Deni Achmad Soeboer — Fri, 21 Nov 2025 08:26:43 +0700

The challenge faced by fishermen involved in lobster fishing is the decline in population due to overfishing and unsustainable practices. Intensive lobster fishing can disrupt the balance of the ecosystem, especially if the fishing gear used is not environmentally friendly. Lost fishing gear can continue to catch lobsters and other species unintentionally, a phenomenon known as ghost fishing. The methods applied in this research include literature review and experimental design. The literature review was conducted by examining data and the development of lobster traps from research publications and various books related to fishing. The analysis of the development of existing trap designs before the modification process is a key factor in selecting the standard trap design. This aims to develop lobster traps that are selective for legal sizes. The tiered wall trap has two entrances, one at the top in the shape of a cylinder with a width of 15 cm and a length of 20 cm, cylindrical in shape and without any hole patterns. It is expected that the trapped lobsters will not be able to escape because the length of the entrance itself is longer than the leg size of the catchable lobsters, where lobsters with a carapace length of 8.3 cm have a front leg length of 8 cm, making it impossible for the caught lobsters to climb out. The design of the tiered wall trap with a perforated pattern on the base of the trap at 8 cm is expected to allow catchable lobsters to climb into the trap's mouth. The tiered walls help lobsters to easily climb up to the mouth, thereby increasing the effectiveness and selectivity of the trap for catchable-sized lobsters. However, this design still needs to be tested in lobster catching areas or in laboratory scale.

Testing the Fire Resistance of Fiberglass Composite Material with a Mixture of Green Mussel Shell Waste

Adhi Paska, Yusrizal Yusrizal, Maman Hermawan, Deni Achmad Soeboer — Thu, 27 Nov 2025 10:21:14 +0700

This study aims to evaluate the effect of adding green mussel shell powder (CKH) on the fire resistance of Fiberglass composite materials used in fishing vessel hulls under 5 GT. The composite was made using the hand lay-up method with variations in CKH composition of 0%, 10%, 20%, 30%, 40%, and 50%. Testing was carried out using the ASTM D635 standard to determine the burning rate. Statistical analysis using logistic regression to determine the linear relationship between variables. Statistically, logistic regression states a p-value <0.05 and is suitable as a reference model to determine the value of CKH powder composition with the burning rate of the material. This study shows that specimens with the addition of 20% CKH increase fire resistance by 8.56% (13.10 mm/min), while the addition of 50% CKH increases up to 19.92% (11.47 mm/min). So that the more CKH composition additions can increase the fire resistance of the material. These results indicate that CKH waste has the potential as an environmentally friendly additive that improves ship safety.