Effects of Chemical and Biofertilizers on Yield and Production Factors of Valerian (Valeriana officinalis L.)

Document Type : Research Paper


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

2 Department of Agronomy, Shahed University, Tehran, Iran


A field experiment was conducted to evaluate the effects of bio and chemical fertilizers on yield and production factors of valerian (Valeriana officinalis L.) at the Homad-Absard Agricultural Complex in Damavand city, Tehran Province, Iran, through a factorial experiment based on a randomized complete blocks design with 3 replications during 2017 to 2020. Experimental factors consist Nitroxin and Phosphate Barvar2 biofertilizers each with 2 levels of inoculation and control, and also the urea (46% N) chemical fertilizer in 5 levels (0, 30, 60, 90 and 150 kg/ha). Measured parameters were root diameter (mm), root length (cm), leaf width (cm) and leaf length (cm) root dry weight (kg/ha), shoot dry weight (kg/ha), valernic acid content (%) and valernic acid yield (g/ha). Results showed that the biofertilizers had 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 (%), biofertilizers increased it. Maximum and minimum amount of valernic acid (%) were measured in control (0.465%) and 150 kg/ha urea (0.215%) respectively. The highest and lowest root dry weight were obtained in interaction of Nitroxin+Phosphate barvar2 + 150 kg urea (665 kg/ha) and control (221 kg/ha) respectively. Results of this experiment showed that biofertilizers with positive effects on experimental parameters are able to replace the chemical fertilizers.


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