diff --git a/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs b/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs
index f2450356..0df5870e 100644
--- a/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs
+++ b/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs
@@ -57,13 +57,14 @@ public class CornField : MonoBehaviour
     
     private readonly CompositeDisposable compositeDisposable = new CompositeDisposable();
     private readonly Subject<int> resetFertilizerTimer = new Subject<int>();
-    private bool isFertilizing;
+    private readonly BoolReactiveProperty isFertilizing = new BoolReactiveProperty();
     
     // Start is called before the first frame update
     void Start()
     {
         compositeDisposable.AddTo(this);
         resetFertilizerTimer.AddTo(this);
+        isFertilizing.AddTo(this);
 
         SoundManager.Instance.PlayBGM("bgm_Main");
         // データ
@@ -88,6 +89,9 @@ public class CornField : MonoBehaviour
         
         // ハートゲージがフルかつダイアログが開いていない場合レベルアップ
         HeartMeter.Instance.FulledHeart
+            .CombineLatest(isFertilizing, (acc, active) => acc && !active)
+            .DistinctUntilChanged()
+            .Where(x => x)
             .DelaySubscription(TimeSpan.FromSeconds(.4f))
             .Subscribe(_ =>
             {
@@ -151,13 +155,13 @@ public class CornField : MonoBehaviour
         {
             GetRewardDialog.ShowCornFieldDialog(() =>
             {
+                isFertilizing.Value = true;
                 gameData.fertilizerTime = DateTime.UtcNow.AddSeconds(fertilizerWaitTime + fertilizerDuration).ToBinary();
 #if UNITY_EDITOR
                 gameData.fertilizerTime = DateTime.UtcNow.AddSeconds(10 + fertilizerDuration).ToBinary();
 #endif
                 GameDataManager.SaveGameData();
                 
-                isFertilizing = true;
                 additionView.IsStopDisapper = true;
                 SoundManager.Instance.PlayBGM("bgm_fertilizer");
                 brotherFertilizerAnimation.StartAnimation();
@@ -196,7 +200,7 @@ public class CornField : MonoBehaviour
 
                         this.CallWaitForSeconds(fertilizerFinishWaitTime, () =>
                         {
-                            isFertilizing = false;
+                            isFertilizing.Value = false;
                             additionView.IsStopDisapper = false;
                             additionView.PlayEffect();
                             // ボタン表示復活