Core Viewpoint - The agricultural sector in Ping'an District, Haidong City, has undergone significant transformation, focusing on high-standard facility agriculture and the cultivation of selenium-rich vegetables, particularly tomatoes, which are gaining popularity due to their unique taste and health benefits [5][6][8]. Group 1: Agricultural Development - The Ping'an District has established several high-standard facility agricultural bases, equipped with irrigation systems and integrated water and fertilizer facilities, effectively addressing the previous challenges of small-scale and weak vegetable production [6][8]. - The area has transitioned from traditional seedling methods to modern substrate seedling technology, resulting in an annual production of over 20 million high-quality vegetable seedlings [8]. Group 2: Selenium-rich Products - The cultivation of selenium-rich tomatoes has become a core competitive product in the region, with a planting area of 29.33 hectares and an annual output of approximately 1,400 tons, contributing to the establishment of a distinctive agricultural brand for Ping'an [7][8]. - The use of natural organic fertilizers and favorable climatic conditions has enhanced the sweetness and taste of the tomatoes, making them highly sought after by consumers [7]. Group 3: Economic Impact - The establishment of 14 greenhouse facilities in Zhangqizhai Village has been part of a broader strategy to revitalize local agriculture and promote the sale of selenium-rich products, thereby enhancing the economic prospects of the region [6][7]. - The integration of production, sorting, storage, and sales has created a closed-loop system in the vegetable industry, significantly boosting the overall competitiveness and market presence of Ping'an's agricultural products [8].