民勤县地处巴丹吉林沙漠与腾格里沙漠交汇地带，年均15℃的昼夜温差和洁净的沙质土壤，造就了独特 的蜜瓜生长黄金带。早在20世纪六七十年代，民勤所产白兰瓜就以肉汁甜爽，味道芳香、大小均匀、易 储耐运而走俏市场，蜚声海外。1984年引进试种成功黄河蜜以来，以黄河蜜为主的蜜瓜生产就成为民勤 经济的支柱产业，种植面积稳定在15万亩，总产量45万吨。 每年7月下旬至8月中旬蜜瓜扎堆上市，价格"跳水"，成为当地蜜瓜产业发展瓶颈。如何打破农产品集中 上市价跌困局，实现效益与增收双赢？民勤县积极探索破局之道，通过引导农民优化瓜业种植结构，精 准对接市场需求，创新采用"错峰种植"模式。 一方面推动春季蜜瓜提前上市抢占先机，另一方面实现秋季延后销售延长供应周期，有效填补市场空 白，逐步构建起四季有鲜瓜的产销新格局，为瓜农增收致富提供有力支撑。 同时，民勤县创新推行"两年五茬"与"两棚轮换倒茬"高效栽培模式，集成穴盘育苗、生物防控等现代农 业技术，配套自动化卷膜通风系统，使温室利用率提升150%。 通过科学规划秋冬茬、冬春茬、越冬茬生产周期，结合水肥一体化精准管理，既攻克"连作障碍"难题， 又实现蜜瓜周年化供应，有效缓解市场"旺季过 ...

Group 1 - The article discusses the local market in Yihu Town, Lintong County, Shaanxi, where farmers sell their homegrown produce, including a traditional melon variety known as "Bai Tu Wa" [1][5] - "Bai Tu Wa" is referred to as "Li Gua" by locals, highlighting a cultural connection to the past and a preference for traditional names over urban terminology [2][6] - The cultivation of "Bai Tu Wa" has a long history in the Guanzhong region, with its sweetness being a cherished memory from times when sugary foods were scarce [6][10] Group 2 - The planting of "Bai Tu Wa" typically occurs once a year, with harvests ready about 40 to 50 days after sowing, allowing for subsequent crops like wheat or radishes [8] - Small-scale farmers can earn approximately 7,000 to 8,000 yuan per mu from "Bai Tu Wa," which is considered a decent income compared to staple crops [9][10] - The introduction of new varieties and agricultural chemicals has led to a decline in the cultivation of traditional varieties like "Bai Tu Wa," which are now rarely found in urban markets [10][11] Group 3 - The article notes that the number of farmers growing "Bai Tu Wa" has decreased significantly, with some farmers opting for other crops due to lower profitability and wildlife damage [11][12] - Despite its decline in urban areas, there remains a market demand for "Bai Tu Wa," with some cultivation continuing in surrounding areas of Xi'an [13] - The seeds for "Bai Tu Wa" are now often sourced from seed companies rather than being saved by farmers, raising questions about the authenticity of the variety [14][17] Group 4 - The commercialization of "Bai Tu Wa" has changed, with professional cooperatives becoming the main cultivators, utilizing modern marketing strategies such as e-commerce [30] - Newer varieties are being developed, such as the "Crisp Pear" melon, which is marketed at a higher price point compared to traditional "Bai Tu Wa" [30][34] - The article emphasizes that while the characteristics of "Bai Tu Wa" may remain similar, the cultivation techniques and economic context have evolved significantly over the years [35][41]