The study looked at how different ways of managing soil can change its chemical properties in protected cultivation. Water-logging and irrigation can lower soil pH and available phosphorus levels. Using animal manures can increase organic matter, phosphorus, potassium, zinc, and copper. Organic amendments like rice and wood residues tend to lower electrical conductivity. Deeper plowing can reduce calcium content. Fertilization and fertigation don't affect nutrient levels much. Some methods, like deeper plowing and crop rotation with rice, have different effects on soil nutrients compared to others. It's important to set limits and standards based on how soil management methods affect soil chemistry for better farming practices.