Abstract:

During 2011 – 2013, a field experiment with pea (Pisum sativum L.) was carried out in the trial field of Dobrudzha Agricultural Institute. The aim was to find out what is the effect of foliar fertilization with liquid fertilizers on the nodulation ability and the grain yield from a new fodder pea variety. The soil in the trial field was slightly leached chernozem (Luvic phaeozem) with very good agro physical and agro chemical properties. The experiment was designed according to the block method in four replications. The variants were the following: 1) check; 2) treatment with liquid fertilizer Bo-La containing boron and molybdenum; 3) treatment with liquid fertilizer Potassium thiosulfate (PTS) containing potassium and sulfur; 4) treatment with liquid fertilizer High-Phos containing phosphorus, potassium and magnesium. Based on the obtained results it was found out that the parameters of nodulation (number, dry weight and life cycle) improved significantly. The value of the changes depending on the applied foliar fertilizers was highest for the index number of nodules per plant – up to 17.1 %, followed by the indices life cycle of the nodules – up to 15.9 %, and dry weight of the nodules – up to 15.8 %. The Mo-B-containing fertilizer Bo – La had highest significance of the effect. The other two fertilizers had lower and almost equal significance. The positive effect of the tested fertilizers was expressed in a similar way on grain yield, too. The increase of grain yield was highest after foliar treatment with B0-La – 11 %, followed by High-Phos – 8 %, and PTS – 5 %

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