Document Type : Research Paper


1 Department of Agronomy, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran

2 Department of Agronomy, Shahed University, Tehran, Iran


The effects of chemical fertilizer of urea in 5 levels (0, 30, 60, 90 and 150 kg ha-1) and biofertilizers in 4 levels (Nitroxin, Phosphate barvar2, mixed of both and control) on quantity and quality yield of valerian were studied during 2016 to 2020. Measured parameters were valernic acid (percent), valernic acid (g ha-1), root dry weight (kg ha-1), shoot dry weight (kg ha-1), root diameter (mm), root length (cm), leaf width (cm) and leaf length (cm). This study was carried out at the Homad-Absard Agricultural Complex in Damavand city, Tehran Province, Iran, as factorial layout based on a randomized complete blocks design with 3 replications. Results showed that the biofertilizers had a significant effect (p≤0.01) on the all quantity and quality parameters studied. Unlike the urea chemical fertilizer at all levels which had a negative effect on the yield and amount of valernic acid (percent), bio-fertilizers had increased it. Maximum and minimum amount of valernic acid (percent) were measured in control and 150 kg ha-1 urea respectively. The highest root dry weight was obtained in interaction of Nitroxin+ Phosphate barvar2+150 kg urea (665 kg ha-1) and control (221 kg ha-1) respectively. Results of this experiment showed that biofertilizers with positive effects on the parameters are able to replace the chemical fertilizers.