After the wheat harvest this year, due to the dry weather, the saline-alkali soil of the Baiqiu Nancun Village in the Pingcheng Township of Ji County where the author was located has returned to alkali. The land in the Yudong Plain is mostly limestone alluvial soils, some of which are saline-alkali soils and have less organic matter. In the 1980s, the alkalization of the saline-alkali soil in the southern village of Baiqiu was more serious. In the following 10 years, 1 to 2 bags of calcium phosphate per acre were used for improvement. Because superphosphate is a chemically acidic phosphate fertilizer, containing free acid and a large amount of gypsum, application on the saline-alkali soil can improve soil pellet structure and reduce soil alkalinity. In addition, each year, wheat, corn, and garlic are poured into water several times, which also acts as a pressure alkali, and the local saline-alkali land slowly turns into weakly alkaline fertile land. In the 1990s, due to work outside the countryside, the young rural labor force was reduced. In order to save more on compound fertilizers, superphosphate is basically no longer used. Compound fertilizer is made up of urea, monoammonium, potassium sulfate or potassium chloride. It contains no acid and no alkali, and some farmers do not understand the nature of the fertilizer. It is blindly applying chlorine compound fertilizer in the field of this saline-alkali soil. Chloride ions can easily increase the salt concentration in the soil, resulting in the return of alkali to saline ground. The same is true of the saline-alkali lands on both sides of the Yellow River. Therefore, it is advisable to apply 1 to 2 bags of calcium phosphate per acre per year in the saline-alkali land. Potassium sulphate must be used for potash fertilizer, and no potassium oxide or chlorine-containing compound fertilizer should be applied. Frozen Sardine,Frozen Sardines Sardinefrozen,Frozen Sardine Fish,Sardine Whole Round Frozen Zhoushan City Shuangying Aquatic Products Co., Ltd.  , https://www.shuangying-aquatic.com