Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2002 , Volume 16 , Number 1; Page(s) 0 To 0.
 
Paper: 

IMPACTS OF FOLIAR APPLICATION OF SULFURIC ACID ON IRON CHLOROSIS OF ORANGE TREE IN A CALCAREOUS SOIL

 
 
Author(s):  TADAYON M.S., RASTGAR H.
 
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Abstract: 
It is speculated that leaf apoplastic pH plays a role in iron absorption by cells. In this experiment, the effect of foliar application of sulfuric acid on leaf chlorophyll content of Jahrom local orange (Citrus sinensis) was investigated. The rootstock was sour orange (Citrus aurantium). The trial was carried out on a calcareous soil. Reports of leaf analysis in the region show normal amounts of iron in spite of the iron chlorosis symptoms of leaves. Also, the interaction of this treatment with application of Sequestrine 138-Fe (Fe-EDDHA) fertilizer to the soil was investigated.
The experiment was conducted using split plots with randomized complete block design. The main factor was Sequestrine 138-Fe fertilizer at three levels 0, 75, and 150 gram per tree. The other factor, spray of sulfuric acid solution, had three pH levels of 3,5, and 6.6; the latter being distilled water as control. Sulfuric acid was used to reduce pH of distilled water to 3 and 5. The experiment had four replications and two trees per subplot. Total number of trees in this study was 72.
Results of our study show that the effect of foliar application of sulfuric acid on leaves chlorophyll content was not significant. Also its interaction with Sequestrine 138-Fe fertilizer was not significant. Also, there was no significant difference between the levels of Sequestrine 138-Fe application. According to the results of this experiment, the pH levels of sulfuric acid solution sprayed two times during the germination had no effect on leaves chlorophyll contents.
It is possible that lack of significant difference between two levels of Sequestrine 138- Fe, 75 and 150 gram per tree, was due to the resistance of the sour orange rootstock to iron chlorosis on calcareous soils
 
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