Ivan PACHEV (BULGARIA)
Abstract. Liquid complex fertilizers find wide application in agriculture. The share of the used liquid fertilizers in the world is over 40%. The use of liquid fertilizers in Bulgaria has a very great future, due to their low price and minimum costs of application. They are convenient to dose when preparing the working solution, contain essential macro and micro nutrients in best possible form for assimilation by plants. They are particularly effective for outside root additional nutrition–the so–called foliar fertilizing, which results in better absorption of nutrients (1.2). The last studies showed that liquid fertilizers had a positive influence on the processes of foliar and root additional nutrition of plants with the purpose of increasing the yield and quality of seeds. Other authors recommended the combined application of leaf fertilizers with growth regulators, which increased the effect. The researches in our country on these matters are still insufficient and incomplete. The objective of this study was to establish the influence of the all–purpose liquid fertilizer “MaxGrow” on lucerne for forage and seed. The doses of treatment of lucerne from 0, 03tо 0, 05 l/ha MG for seed production were of interest, since on average for the period the yield was the highest: 356.3; 321.9 and 315.6 kg/ha, respectively. The increase, as compared to the untreated control, varied from 35.4 tо 231.3 kg/ha. Thehighestyieldofforagegreenmass, onaveragefortheperiodofstudy, wasproduced at the dose of 0.06 l/ha MG with an yield of 12540 kg/ha, followed by the doses of treatment of 0,05 and 0,04 l/ha MG with produced green mass from 12490 tо 10330 kg/ha, respectively.
Key words: fertilizing, liquid fertilizers, lucerne, seed production