NITROAMMOPHOSK AND OTHER “PHOSKES” – WHAT IS THE DIFFERENCE?

Please tell me how the fertilizers nitroammofoska, azofoska and ammophoska differ from each other. Or is it the same fertilizer?

Stanislav Kalinnikov, Kaluga region.

Raisa Petrunina, Plant Protection Specialist, answers

Azofoska and nitroammofoska - the same complex fertilizer, which includes three main components - nitrogen, phosphorus and potassium, as well as - in small quantities - magnesium and sulfur. It is produced in the form of non-hygroscopic, non-caking, crumbly pinkish granules (1-4 mm). Contains chlorine. Depending on the brand, it has a different NPK ratio - 16:16:16; 22:11:11; 25:9:9; 19:9:19.

In addition to them, you can also find nitrophoska and ammophoska on sale. To understand the difference between nitroammophoska and other “foskas”, you need to decipher their names. Nitro and ammo indicates that the fertilizer contains nitrogen.

“Nitro” is a nitrate form of nitrogen, promotes the accumulation of nitrates in fruits; it is not recommended to apply it in the second half of summer.

«Ammo"- ammonium form - in this sense it is more harmless, but, like any nitrogen fertilizer, it provokes the growth of tops instead of fruits. It is also better to apply in the first half of the warm season.

«Phos" indicates the presence of phosphorus, and "ka" indicates the presence of potassium. When applying fertilizers without the “ka” at the end of the name (ammophos), if you want to apply complex fertilizing, you will have to additionally buy potash fertilizer.

In ammophoska, unlike nitroammophoska, nitrogen is presented only in ammonium form, which makes it safer from the point of view of the accumulation of nitrates by plants.

Nitrophoska differs from nitroammophoska in the method of production, color (its granules are gray or white) and poorer composition. The most popular brands contain NPK, and some also contain magnesium (Mg): 16:16:16; 15-10-15-2; 8-12-24-4; 10-4-7-0, 2.

Three varieties are available: sulfate (it is used for feeding cucumbers, zucchini, cabbage, tomatoes and legumes), phosphorite (for tomatoes), sulfate (for flowers).

Reference by topic: Application of nitrogen fertilizers in ammonium form

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