Improvement of Soybean (Glycine max L.) Yield with Urea Foliar Application at Growth Stages
Subject Areas :
Journal of Crop Ecophysiology
Mahmood
Tohidi
1
(Faculty member, Islamic Azad University Dezful Branch)
Received: 2016-08-07
Accepted : 2017-02-25
Published : 2017-07-23
Keywords:
nitrogen,
soybean,
Growth stage,
foliar,
Abstract :
To investigate the effects of nitrogen foliar application at different growth stages of soybean on the yield and yield components this experiment was performed in Shush, north of Khuzestan, Iran, during growing season of 2014. The experiment was in split plot based on randomized complete block design with three replications. Experimental treatments consisted of four levels of nitrogen fertilizer foliar applications as control (no nitrogen foliar application), 25, 50 and 75 kg/ha pure nitrogen from urea source (46% pure nitrogen) assigned to the main plots and spraying times in three levels, at vegetative stage, flowering stage and podding stage to the subplots. Results showed that the effects of nitrogen foliar application on traits measured in this experiment like leaf area index, number of pod per plant, number of seeds per pod, thousand seed weight, seed yield, biologic yield, harvest index, protein percent and protein yield and also interaction of different levels of nitrogen foliar application and different growth stages, were significant. Oil percent and yield were only significant under the effect of nitrogen foliar application treatments at different growth stages while the interaction of different levels of nitrogen foliar application and different growth stages, were not significant. In this experiment nitrogen foliar application increased seed yield. The highest seed yield amounted to 2466 kg/ha when 50kg/ha of foliar nitrogen applied at vegetative growth stage and lowest seed yield amounted to 1295 kg/ha in the control treatment at the stage of podding. In general, results demonstrated that 50 kg/ha treatment could be considered as the best management option of nitrogen foliar application for soybean at vegetative growth stage.
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