Published in Scientific Papers. Series B, Horticulture, Vol. LXV, Issue 1
Written by Nesho NESHEV
The aim of the study conducted from 2017 to 2019 is to evaluate the influence of the herbicide stress caused by the herbicide imazamox and biostimulatory treatment (preventive and curative) to the leaf N, P, and K content of pumpkins before the flowering stage. In the trial, the pumpkin variety 'Mathilda’ F1 was grown. The experiment included 12 treatments. Number 1 was untreated weed-free control. Treatment 2 was Pulsar® 40 (40 g/l imazamox) applied at a rate of 1.00 l ha-1. The other treatments (from 3 to 7) represented the application of the mentioned herbicide in tank mixture with biostimulant. The treatments from 8 to 12 showed the performance of therapeutic biostimulant application 7 days after the herbicide spraying. The herbicide was applied in BBCH 12-13 of pumpkins. The biostimulant products evaluated were: Shigeki®; Amino Expert® Impuls; Lactofol® O; Aminozol®; Terra-Sorb® Complex. The highest leaf N content for the untreated control was found. No influence of the treatments on the P content in the leaves was observed. The treatments that received the highest herbicide stress had increased leaf K levels.
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