宝坻是天津市郊县，农田属石灰性土壤。由于长期单一施用氮、磷化肥，中、微量元素没有得到有效补充以及施肥引起元素间拮抗作用，导致土壤养分失去平衡。根据不同地区土壤有效锌状况和不同作物的需肥规律，向农民提供简便易行的施锌配方、含锌复(混)合肥料、锌肥等物化技术，3 Baodi is a suburb of Tianjin, farmland is a calcareous soil. Due to the long-term single application of nitrogen and phosphorus fertilizers, medium and trace elements are not effectively replenished and fertilization causes antagonism between elements, resulting in a loss of balance of soil nutrients. According to the soil available zinc status in different areas and the demand of different crops, farmers should be provided with simple and convenient zinc application formulas, such as zinc-containing compound fertilizer and zinc fertilizer, 3