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During a five year period (2011–2015) research was carried out with spring wheat on a Bathihypogleyi-Calc(ar)ic Luvisol (LVk-gld-w) with predominant silt loam on clay loam. The main aim was to establish how different foliar fertilizers affect spring wheat when the optimum nitrogen (N), phosphorus (P), potassium (K) and sulphur (S) rates had been applied during the main fertilisation. The soil was well-drained and very high in plant-available phosphorus (P2O5) and potassium (K2O), pHKCl 6.4–7.4. Each year, depending on agrochemical analyses done in spring, all treatments were applied with the same rates of mineral fertilizers. The experiments established that the foliar nutrition of spring wheat at the BBCH 29–30 stage with amino acids with amide nitrogen (Delfan 2.0 l ha-1) or microelements (Tradecorp Cu 0.8 kg ha-1, Tradecorp Mn 1.0 kg ha-1 and Tradecorp Zn 1.0 kg ha-1) increased grain yield only in one year out of five, and ammonium sulphate (15.0 kg ha-1) and urea (6.7 kg ha-1) in two years. The average data of five years indicated that the foliar fertilisers used did not increase grain and straw yield statistically significantly and did not have significant influence on the content of crude protein and starch in grain.

The influence of foliar fertilization with nitrogen, sulphur, amino acids and microelements on spring wheat