Iron chlorosis alleviation on citrus trees by localize placing of ammendments and fertilizers
2004
Shahabian, Mahmud | Gandomkar,, Akbar | Saleh, Jahan Shah | Rastegar, Hamid
This research was accomplished due to the importance of citrus productions in the country and also determinative role of Fe on production yield and fruit quality. With attention to our calcareous soils and consequently their high pH , Fe deficiency and it,s signs are found in citrus a lot. One of the ways to suppress this difficulty is iron application through localize placement method (chalkood). For this purpose, present research design with 7 fertilizer treatments containing different combinations of Fe and other nutrient elements application and with 7 replications performed to investigate the possibility of iron chlorosis suppression in Dezful, Haji Abad and Jahrom. Obtained data were analyzed statistically by MSTATC software and comparison between means were done by Duncan,s test. In Dezful the 3,4,5 and 6 treatments significantly increased the yield and number of fruits (3=104 kg/tree,4=98 kg/tr,5=102 kg/tree,6=97 kg/tree and control=70kg/tree)and resulted 49%, 41%, 46% and 39% yield increase respectively. This study demonstrated that the deep placing of FeSO4 with composted organic matter and Fe foliar application, are the effective methods to obtain high yield in orange trees in Northern Khouzestan. In Haji Abad the results showed that treatments had significant effects on measured parameters except for potassium and nitrogen in leaves. Furthermore , the comparison between means expressed that treatments 7 (chalkood plus foliar spray) and 5 ( chalkood) showed the highest effect to increase the yield and nutrient elements of leaves and also improvement fruit quality. Then treatments 6 and 3 are placed, that is, sometimes surface application of FeSO4 plus foliar spray had the most desirable effect and sometimes Surface application of Fe- EDDHA . Next place belongs to treatment 4 , that is, surface application of FeSO4 that allocates less positive role to itself, after control treatment. Treatments 1 and 2 , that is, control and farmers common were also in the lowest place. In Jahrom the results showed that the 3, 5, 4, 7, 6 treatments had significant effects on yield in comparison to 1,2 treatments and the best treatment was 100gr Fe-chelate per tree (3-22240, 5-18291, 4-17899, 7-16638, 6-14771, 2- 12714 and 1-12125 Kg/ha). This means that local and broadcast using of FeSO4 due to 4000 kg yield increase with use of Fe chelate, couldn&rsquot compet with Fe chelate.
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