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Piasan - Model S 25/6 - Nitrogen and Sulfur for Crops
With PIASAN-S 25/6 it is possible to apply nitrogen and sulfur in a balanced ratio. That guarantees supply of nutrients in line with requirements with maximum yields.
Nitrogen is present in the proven combination of urea nitrogen, ammonium nitrogen and nitrate nitrogen. An immediate and sustainable nitrogen supply results from this. The fully water soluble sulfur consists of ammonium sulfate and ammonium thiosulfate. The sulfate sulfur from the ammonium sulfate can be utilized by the plants immediately. The sulfur from the thiosulfate is converted in the soil over several stages and taken up as sulfate sulfur in line with requirements. In this concentration it has neither a urease nor a nitrification inhibiting effect. Ammonium thiosulfate as a mixing partner in the liquid fertiliser acts as a pure source of nutrients.
The sulfur requirement for agricultural crops varies. Cruciferous plants such as oilseed rape have a particularly high sulfur requirement due to their high mustard oil content. The sulfur concentration in the plant dry matter of oilseed rape should not go below 0.45 %. For cereals the concentration should not be below 0.30 %. High yields and protein contents are otherwise endangered (DLG 2012).
Sulfur deficiency can result in problems with the nitrogen uptake. Nitrogen and sulfur are always required in a narrow fixed ratio for the build-up of protein. In addition nitrate cannot be converted as there is a deficiency in the sulfur containing enzyme nitrate reductase. The nitrogen incorporation in amino acids is thus disturbed and protein formation is inhibited. One kilogram of deficiency in sulfur per hectare can block the uptake of 10 to 15 kg of nitrogen. The uptake of sulfur into the plant occurs in sulfate form. Sulfur fertilisation should occur right at the start of spring growth in the event of an acute deficiency; otherwise it is also possible for quality application.