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Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2004 , Volume 18 , Number 2; Page(s) 0 To 0.
 
Paper: 

EFFECT OF SOME ROOTSTOCKS, SCIONS AND IRON FERTILIZER (SEQUESTRENE) LEVELS ON IRON CHLOROSIS OF ORANGE

 
 
Author(s):  TADAYON M.S., TALAEI ALI REZA, MALAKOUTI M.J., FAYAZI M.
 
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Abstract: 
Iron chlorosis is considered to be one of the most important nutritional disorders in citrus trees, particularly in calcareous soils that seriously reduce yield and fruit quality. Selection of Fe-efficient rootstocks is one of the important approaches to prevent this nutritional problem. A field experiment was carried out at Jahrom Agricultural Research Station, Iran, to study 4 resistant rootstocks including: Macrophylla (Citrus macrophylla wester), Volkamer lemon (Citrus volkameriana), and Sour orange (Citrus autantium) and Sour lime (Citrus aurantifolia Swing) and scions including: Valencia orange, Washington navel orange, Jahrom local orange and red pulp orange (Moro). Also the effects of Sequestrene 138 Fe in three levels 0(control), 5 and 10 g/tree were compared. The Macrophylla and Sour orange rootstocks had the best positive and significant effects in increasing the scions, leaf chlorophyll index at 1% statistical level. Macrophylla also had the highest iron absorption. The interaction between rootstocks and Sequestrene 138 Fe showed that the application of Sequestrene 138 Fe levels on Macrophylla rootstock did not have a significant effect on leaf chlorophyll index at 1% statistical level. Therefore, Macrophylla had high potential in increasing scions leaf chlorophyll index without any use of Sequestrene 138 Fe as fertilizer. Sour orange had lower iron absorption than other rootstocks, but significantly increased scions leaf chlorophyll index. In contrast, sour lime with high potential for iron absorption had little effect on scions leaf chlorophyll index. This not only clearly showed the effect of rootstocks on scions leaf iron chlorosis Paradox, but also indicated that the effectiveness of rootstock in resisting iron chlorosis is related to mechanisms other than the extent of iron absorption by the roots. Macrophylla significantly increased iron, zinc, manganese and copper absorption in comparison with other rootstocks at 1% statistical level. Moreover, it absorbed the highest rates of phosphorus and potassium and a favorable rate of nitrogen. This high absorption potential of Macrophylla put it in the group of effective rootstocks for Jahrom. The results of the experiment also demonstrated the significant difference between graft varieties on resistance against iron chlorosis, i.e., the navel and local oranges had high chlorophyll index irrespective of the rootstock varieties. In contrast, the scions like red pulp and Valencia orange had lower chlorophyll index and were affected by the rootstock varieties more than others. For example, in comparison with sour lime, the Macrophylla rootstock increased red pulps orange (Moro) leaf chlorophyll index by about 21 percent.
 
Keyword(s): JAHROM, CITRUS, IRON CHLOROSIS, ROOTSTOCK
 
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