Application of organic fertilizer enriched with Trichoderma harzianum on shallot (Allium cepa) cultivation in ultisols

Abstract. Gofar N, Nur TP, Permatasari SDI, Muslimah S, Fikri H, Haryono A, Pujiati, Utami HA. 2023. Application of organic fertilizer enriched with Trichoderma harzianum on shallot (Allium cepa) cultivation in ultisols. Biodiversitas 24: 2426-2433. Shallot is a critical commodity substantial economic value. However, several factors, such as pests and diseases, negatively impact its low productivity. Therefore, to address these challenges, the agricultural sector developing an biological agent harzianum. This improves soil fertility, controls Fusarium wilt, enhances production. study aimed evaluate effectiveness suppressing growth oxysporum increasing it included five treatments at varying concentrations 0, 200, 300, 400, 500 kg ha-1. The results showed that applying 400 ha-1 suppressed wilt. dose had highest pH value 5.50-5.78 among other increased 55.7% production Ultisols compared application NPK 16-16-16. Based results, could improve increase control wilt shallot.