Update app.py

app.py

@@ -770,7 +770,7 @@ class NutrientCalculator:
           "POTASSIUM_SULFATE": {"weight": -0.18, "fert": "Калий сернокислый", "main_element": "K"},
           "MAGNESIUM_SULFATE": {"weight": -0.1, "fert": "Сульфат магния", "main_element": "Mg"},
           "MONOPOTASSIUM_PHOSPHATE": {"weight": -0.14, "fert": "Монофосфат калия", "main_element": "P"},
-          "CALCIUM_NITRATE": {"weight": 0.15, "fert": "Кальциевая селитра", "main_element": "Ca"},
+          "CALCIUM_NITRATE": {"weight": -0.25, "fert": "Кальциевая селитра", "main_element": "Ca"},
           "CALCIUM_NITRATE_NO3": {"weight": -0.25, "fert": "Кальциевая селитра", "main_element": "NO3"}
         }