تاثير محلول پاشي سولفات روي ، منگنز و منيزيم بر عملكرد كمي و كيفي ميوه پرتقال محلي جهرم

EFFECTS OF ZINC, MANGANESE AND MAGNESIUM SULFATE EFFECTS OF ZINC, MANGANESE AND MAGNESIUM SULFATE

To determine the effect of zinc, manganese and magnesium sulfate foliar application on the yield and quality of `Jahrom Localʹ orange (Citrus sinensis Swing), an experiment was carried out as factorial in randomized complete block design (RCBD) whit three replications and two trees per plot in two consecutive years (1998-1999). The experimental factors included zinc sulfate at three levels 0, 2 and 4 g liter-l; manganese sulfate at three levels 0, 1 and 2 g liter-ʹ and magnesium sulfate at three levels 0, 5 and 10 g liter* The experiment conducted on 20-year-old trees with the sour orange as rootstocks and drop irrigation system in Jahrom Agricultural Research Station. The results showed that the foliar application of zinc, manganese and magnesium sulfate and their interaction effects on the yield in comparison with control were statistically significant (P=0.01). Economical survey illustrated that the best treatment for increasing the yields was foliar application of 4 g liter-` of zinc sulfate with 1 g literʹ manganese sulfate and no magnesium sulfate. This treatment significantly increased the mean yield from 13543 kg ha n in control to 28914 kg ha-`. The results of leaf analysis indicated that zinc and manganese concentrations in the leaves were increased but there was no change in magnesium concentration. The interaction effects of zinc and manganese sulfate Foliar application caused a significant increase on fruit vitamin C and total soluble solid (TSS) contents. Moreover, foliar applications of manganese sulfate alone considerably increased fruit TSS content.