Optimizing the Growth and Production of Red Onion (Allium cepa L.) by Applying Biofertilizer and NPK Fertilizer

This research aims to assess the impact of combining Biofertilizer with NPK fertilizer on the development and productivity of the red onion cultivars Maja Cipanas and Bima Brebes. Measurements were conducted at three time points: 3, 6, and 9 weeks after planting (MST) to assess the plant height, fruit weight per plant, and net weight. This research employed a Completely Randomized Design (CRD) to compare various combinations of Biofertilizer and NPK fertilizer treatments. Treatments included a Control group receiving no biofertilizer or NPK fertilizer, as well as treatment groups receiving 0.5 kg of both Biofertilizer and NPK fertilizer, 0.5 kg of Biofertilizer and 1 kg of NPK fertilizer, and 0.5 kg of Biofertilizer and 1.5 kg of NPK fertilizer. The second contributing factor pertains to Red Onion Variety Bima Brebes and Red Onion Variety Maja Cipanas. The findings demonstrated that the Maja Cipanas variety exhibited optimal performance across all measured parameters when treated with 0.5 kg biofertilizer and 1.5 kg NPK fertilizer. At 3 weeks after planting (WAP), the height of the plants was measured at 23.0 cm, which increased to 34.2 cm at 6 WAP and further to 44.8 cm at 9 WAP. There was a notable increase in fruit weight per plant, reaching a peak of 385.5 grams at 9 weeks after planting (WAP), and the net plant weight also reached 270.5 grams at the same time.