Valuation of costs and change in returns of seedling technology and shallot planting distance: A case study in Grobogan Regency, Central Java, Indonesia. Period. Eng. Nat. Sci. [Internet]. 2021 Jul. 31 [cited 2026 May 13];9(3):400-8. Available from: https://pen.ius.edu.ba/index.php/pen/article/view/858