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Paper Information

Journal:   PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH)   fall 2017 , Volume 9 , Number 30 ; Page(s) 85 To 96.

Using multivariate statistical analysis of some agronomic traits on forage yield of sorghum under different levels of nitrogen and zinc

Author(s):  Maleki A., Mirzaei Heidari M., FATHI A.
In order to determine some effective traits on dry forage yield of forage sorghum under different levels of nitrogen and zinc sulfate applications, a split plot experiment based on randomized complete blocks design with 3 replications was conducted in Agricultural Research Station in Dehloran town located in north of Ilam Province during summer of 2016-17. Three levels of nitrogen including: 0. 100 and 200 kg. ha-1 of urea fertilizer was arranged in main plots and zinc sulfate applications including: 0, 20, 40 and 60 kg. ha-1 in sub plots. The effect of nitrogen and zinc sulfate was significant on all of studied traits except leaf numbers. The interaction effect of these treatments was significant only on forage fresh weight and stem diameter. Results of multiple linear regression analysis indicated that leaf dry weight, plant height, leaf number, tiller number, stem diameter and digestible dry matter had the most influence on dry forage yield. Their influences accounted for 88% of sorghum dry forage variances. Results of stepwise regression indicated that leaf dry weight (60%), tiller number per plant (22%) and stem diameter (20%) included 85% of total forage yield variances. In general, these results showed that to obtain the desirable forage yield of sorghum, the fertilizers must be managing typically that maintained the leaves dry weight, tiller numbers and stem diameter in suitable levels.
Keyword(s): Forage,nitrogen,regression analysis,zinc sulfate
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