Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 1
Written by Carmen SÎRBU, Traian CIOROIANU, Nicoleta MARIN, Daniela MIHALACHE
Fertilizers with foliar application or those containing substances that have a nutrient-stimulating effect have indicated that the use of biostimulants alone in crop treatment often does not lead to significant effects on yield and quality. The carried out research aimed to establish, using the labeled nitrogen 15N as a tracer, the contribution of complex foliar fertilizers containing natural organic substances, to increase the efficiency of using different forms of nitrogen from the soil applied fertilizer. The degree of recovery from soil to plant was evaluated using the sunflower test plant (Helianthus an-nuus). The procedure was performed under foliar application conditions of two fertilizers containing macronutrients, secondary elements and microelements with / without organic substances (protein hydrolyzate). Stable 15N isotopes have been used to examine nitrogen (15N) uptake from soil-applied chemical fertilizers. Depending on the nitrogen species applied, an increase of the 15N/N ratio was observed as follows: amide nitrogen (-NH2) < ammoniacal nitrogen (-NH4) < nitric nitrogen (-NO3).
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