三、调整措施与效果1、推广“早、优、高”栽培技术,进一步开发砂区优势作物开封西瓜,因个大、皮薄、瓤沙、多汁、味正、甜度高而著名,为开封砂区的一大优势作物。建立开发区前,由于技术落后和“粮主型”农业的指导思想,西瓜种植面积一直在80—100亩左右徘徊,单产1000公斤上下,糖度7—8。1983年开始采取引进优良品种,促使西瓜品种更新换代,采用地膜覆盖,配方施肥,营养钵育苗等一系列规范化栽培技术,促使西瓜种植面积迅速扩大, Third, the adjustment measures and effects 1, the promotion of “early, excellent, high” cultivation techniques to further develop sand crop Kaibeng watermelon, because of a large, thin, sand, juicy, taste is positive, sweet and famous, Kaifeng sand area is a major crop. Before the establishment of the zone, due to technical backwardness and the guiding ideology of “food-dominated agriculture”, watermelon acreage has been hovering around 80-100 mu, with a yield of 1000 kg, with a sugar content of 7-8. In 1983, the introduction of fine varieties Watermelon varieties replacement, using mulching, formula fertilization, nutrition Bowl nursery and a series of standardized cultivation techniques, prompting the rapid expansion of watermelon acreage,