Combined Effects of Mycorrhiza, Organic Fertilizers, and Potassium Application on Yield and Quality of Pomegranate (Punica granatum L.) fruit

Authors

1 MSc., Department of Soil Science, Darab Branch, Islamic Azad University, Darab, Iran

2 Associate Professor., Soil and Water Department, Fars Agricultural and Natural Resources Research and Education Center, AREEO, Shiraz, Iran

3 Scientific member, Seed and Plant Improvement Department, Fars Agricultural and Natural Resources Research and Education Center, AREEO, Darab, Iran

Abstract

In order to investigate the effects of mycorrhiza, potassium, and manure application on the yield and quality of pomegranate fruits, in 2014, an experiment were conducted in a randomized complete block design as factorial with 12 treatments and three replicates. Experimental factors included combinations of two levels of mycorrhiza (0 and 500 g.tree-1), three levels of sheep manure (0, 10, and 20 kg per tree) and two levels of potassium (0 and 500 g K2O.tree-1). The measured traits included yield per tree, contents of carbohydrate, brix, and phenolic acids (sinapic acid, gallic acid, catechin, rutin and ascorbic acid) in the pomegranate fruits. The results showed that the main effects of potassium, mycorrhizae and manure were significant (P<0.01) in reducing the acidity of the juice. Mycorrhiza and/or manure application significantly increased the fruit yield, the amount of carbohydrates, and polyphenols. Although potassium applications had no significant effects on increasing brix, catechin and ascorbic acid, but significantly (P<0.01) increased the fruit yield and the amount of carbohydrates, sinapic acid, gallic acid and rutine. The combined application of mycorrhiza, manure, and potassium had a significant effect (P <0.01) on the studied factors, with the exception of fruit weight, pH, brix and ratine. The lowest acidity and highest values of sinapic acid, gallic acid, catechin, rutine and ascorbic acid in fruits juice were obtained from combined application of 500 g mycorrhiza, 500 grams of potassium and 20 kg of manure per tree. The highest yield of fruit (44 kg per tree) was obtained from the combined application of 500 g mycorrhiza, 10 kg of sheep manure and 500 g of K2O, which showed 127% increase in yield compared with the control treatment. 

Keywords

References

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Iranian Journal of Soil Research
Volume 31, Issue 3
December 2017
Pages 329-338

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