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All fertilizer can be [[Crafting#Fertilizer|crafted]], once the required level of [[Farming#Farming Skill|Farming skill]] is reached. Fertilizer can also be purchased at [[Pierre's General Store]] year-round, or at [[Oasis|The Oasis]] on specific [[Days of the Week|days of the week]].
Fertilizer remains in the soil all season. When the season changes, fertilizer normally disappears. However, there are two exceptions in which fertilizer will remain in the soil:
*If a multi-season [[crops|crop]] (''i.e.'', [[Ancient Fruit]], [[Coffee Bean]], [[Corn]], [[Sunflower]], or [[Wheat]]) is planted in the fertilized tile, and the new season is one in which the crop grows, the fertilizer will remain.
*Any crop planted in the greenhouse before its normal growing season will retain its fertilizer if the new season is one in which it normally grows.
Removing a crop with a [[Tools|Tool]] like the [[Pickaxes|Pickaxe]] does not remove the fertilizer. Only one type of fertilizer may be used per soil tile.
==ヒント肥料のコスト==クラフトで作成された肥料は、店で購入するよりもお金を節約できます。:''See also: [[Quality Fertilizer#When to turn your fish into Quality Fertilizer|When to turn your fish into Quality Fertilizer]]''With the exception of [[Quality Fertilizer]], crafting Fertilizer is always cheaper than purchasing it.
*Each time you craft [[きほんの肥料Speed-Gro]]**農業レベル1で作成可能になります。**or [[樹液Deluxe Speed-Gro]]は木を切り倒したり、スライムを倒すことで、簡単に取得できます。, you receive 5 fertilizers, though the "5" does not show up on the crafting menu until you have the required ingredients in inventory. Each time you craft [[Quality Retaining Soil]], you receive 2 fertilizers, though crafting just one would still be cheaper than purchasing it.
*The tables below compare the cost of crafting [[高級な肥料Speed-Gro]]**釣りレベル3で作成可能になります。**or [[カニかごDeluxe Speed-Gro]]をいくつか作り、カタツムリ、エビ、ムールガイ、カキ(魚として分類される)を取得する為に農場内の池やagainst purchasing them at the [[ビーチOasis]]に設置しましょう。*or [[グングンノビールPierre's General Store|Pierre's]]**[[アサリ]]:[[ビーチ]]の浜辺から採取したり、海に[[カニかご]]を設置しましょう。**[[マツやに]]:マツの木に[[樹液採取器]]を設置しましょう。*[[グングンノビールデラックス]]**[[サンゴ]]:[[ビーチ]]の浜辺から採取しましょう。**[[オークの樹脂]]:オークの木に[[樹液採取器]]を設置しましょう。. The cost of crafting is the sell price of the constituent ingredients.{| class="wikitable" id="roundedborder"!画像!名称!作成コスト!販売価格!価格差
''Note: Technically it is not possible to find iridium quality clam/coral if you have chosen the Tapper Profession.''
==バグ==
As of PC v1.2.33, applying [[Speed-Gro]] or [[Deluxe Speed-Gro]] to a crop after planting has no effect on crop growth, even if applied immediately after planting a seed.