Effect of different amounts of humic chelate magnesium and Gibberellins on the growth and yield of cowpea
Subject Areas :
Sami Saadi
1
(Department of Agronomy, Ahvaz Branch, Islamic Azad University Ahvaz, Ahvaz- Iran.)
Tayeb Saki Nejad
2
(Department of Agronomy, Faculty of Agriculture Islamic Azad University of Ahvaz, Ahvaz-Iran)
Keywords: LAI, Cowpea, Growth Analysis, NAR, humic chelate magnesium, Gibberellins,
Abstract :
The present study intended to investigate the effect of different doses of Humic Magnesium Chelate and Gibberellin on cowpea’s growth trend and production components under field conditions in Shadegan in summer 2014. To this end, a factorial experiment in a randomized complete block design with three replications was conducted. The first factor included Humic Magnesium Chelate at three levels (0, 200 & 400 ml.h) and the second factor included Gibberellin at three levels (0, 150 & 300 ppm). The results indicated that spraying the plants with Humic Magnesium Chelate 400 ml.h and Gibberellin 300 ppm increased leaf Area Index (LAI) and Total Dry Weight (TDW). Whereas, in terms of Crop Growth Rate (CGR), spraying with Humic Magnesium Chelate 200 ml.h and Gibberellin150 ppm increased Regular Growth Rate (RGR) and Net Assimilation Rate (NAR). According to the results of ANOVA, there was a significant difference between different levels of Humic Magnesium Chelate in grain yield %5 probabilities Level. The difference between the different levels of Gibberellin, grain yield was significant at the 1% level. As well as the interaction between hormones, grain yield was significant at the 1% level. Furthermore, the highest grain yield was associated with the treatment of Humic Magnesium Chelate 200 ml.h and Gibberellin 150 ppm by 2,720 kg.ha; on the contrary, the lowest grain yield was observed in the control treatment by 1.950 kg.ha. To conclude, the results of the current research showed that the effect of Gibberellin treatment was higher on different doses of measured traits than Humic Magnesium Chelate treatment; and the application of Humic Magnesium Chelate 200 ml.h and Gibberellin 150 ppm was more effective on grain yield, yield components and physiological indices in comparison to the consumption of the higher concentration doses.
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