Differences

This shows you the differences between two versions of the page.

--- cultivation:feeding:nutrients [2026/07/03 18:55] – vaugith
+++ cultivation:feeding:nutrients [2026/07/08 13:15] (current) – [Optimal Nutrient Ratio] vaugith
@@ Line 8: / Line 8: @@
 ===== In depth explanation of nutrients =====
-The most common expression of nutrients you will see on products is NPK. When you see three numbers on the front of a fertilizer product label in "20-20-20" format, these are the percentages of Nitrogen (N), Phosphorus (P), and Potassium (K). To find inclusions of other nutrients, you typically have to look on the back at the Guaranteed Analysis table. Aside from those big three, other required nutrients include Calcium (Ca), Magnesium (Mg), and a whole spectrum of micronutrients, which are essential but present in miniscule quantities.
+The most common expression of nutrients you will see on products is NPK. When you see three numbers on the front of a fertilizer product label in "20-20-20" format, these are the percentages of Nitrogen (N), Phosphorus (P), and Potassium (K). These are known as the Macronutrients. To find inclusions of other nutrients, you typically have to look on the back at the Guaranteed Analysis table. Aside from those big three, other required nutrients include Calcium (Ca), Magnesium (Mg), and a whole spectrum of micronutrients, which are essential but present in miniscule quantities.
 ===Nitrogen===
@@ Line 42: / Line 42: @@
 ==== Optimal Nutrient Ratio ====
-The optimal elemental nutrient ratio expressed in N:P:K:Ca:Mg is 1 : 0.4 : 1.6 : 1 : 0.35. On fertilizer products sold in the US, P is expressed in terms of P2O5 and K is expressed as K2O, which can be verified by examining the label.
+The optimal elemental nutrient ratio expressed in N:P:K:Ca:Mg is 1 : 0.4 : 1.6 : 1 : 0.35. On fertilizer products sold in the US, P is expressed in terms of P²O⁵ and K is expressed as K²O, which can be verified by examining the label.
-* P2O5 x 0.436 = P
+* P²O⁵ x 0.436 = P
-* K2O x 0.83 = K
+* K²O x 0.83 = K
-So for a US label product, the optimal N:P2O5:K2O:Ca:Mg ratio is 1 : 0.92 : 1.93 : 1 : 0.35. Micronutrients are also important. For a deep dive on where this ratio comes from, check out this forum thread: https://cactiguide.com/forum/viewtopic.php?t=47603
+So for a US label product, the optimal N:P²O⁵:K²O:Ca:Mg ratio is 1 : 0.92 : 1.93 : 1 : 0.35. Micronutrients are also important. For a deep dive on where this ratio comes from, check out this forum thread: https://cactiguide.com/forum/viewtopic.php?t=47603
 Masterblend 3 part is the one product on the market I have been able to find that most closely hits these ratios and at a good price too. The other two options mentioned above are slightly off on the ratios but close enough that they shouldn't cause any issues. Masterblend has the added benefit of buffering the feed solutions pH to a perfect 6.3 when mixed properly and allowed to rest for 3 to 12 hours before use. It should be prepared as follows: Dissolve 2 parts Tomato & Vegetable, 1 part epsom salts in the majority of the water. In a separate container, dissolve 2 parts calcium nitrate and then add to the rest. Do not let mixed fertilizers sit for more than a day as you may see algae or bacterial growth or you could have the components react and create a suspension, indicated by clouding, which would change the nutrient availability and pH.