Document Type : Research Paper


1 Ph.D. Student, Department of Agronomy, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran.

2 Associate Professor, Department of Agronomy, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran.

3 Associate Professor, Department of Agronomy, Shahed University, Tehran, Iran.

4 Assistant Professor, Department of Agronomy, Varamin-Pishva Branch, Islamic Azad University, Varamin, 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 are studied during 2016 to 2020. Measured parameters include 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 is 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 show that the biofertilizers have had a significant effect (p≤0.01) on the all quantity and quality parameters studied. Unlike the urea chemical fertilizer at all levels, which have had a negative effect on the yield and amount of valernic acid (percent), bio-fertilizers has increased it. Maximum and minimum amount of valernic acid (percent) are measured in control and 150 kg ha-1 urea, respectively. The highest root dry weight belongs to interaction of Nitroxin+ Phosphate barvar2+150 kg urea (665 kg ha-1) and control (221 kg ha-1) respectively. Results of this experiment show that biofertilizers with positive effects on the parameters are able to replace the chemical fertilizers.


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