Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2003 , Volume 17 , Number 2; Page(s) 123 To 131.
 
Paper: 

EFFECT OF FOLIAR APPLICATION OF POTASSIUM SULFATE AND CALCIUM CHLORIDE ON DATA BUNCH FADING DISORDER OF MAZAFATI CULTIVAR

 
 
Author(s):  ROUSTA M.J.*
 
* 
 
Abstract: 
Recently, Bunch Fading Disorder of date palm has extended in important date producing regions of Iran (e.g. Jiroft and Bam). This disorder has only been reported from Iran. It has severely damaged the date growers. Although several investigations have been conducted to identify the responsible agent(s), so far, there has been no success. However, all researchers believe that unsuitable climatic conditions, such as high temperature and low humidity influence the incidence of this disorder. On the other hand, it is confirmed that calcium plays a specific role in cell wall stability and potassium has an important role in the resistance of plants against the environmental stresses, pests and pathogens. Also, balanced nutrition positively affects the plant health. In order to evaluate the effects of foliar application of potassium sulfate and calcium chloride with or without applying micronutrients (to soil) on date bunch fading, an experiment was carried out in randomized complete block design (RCBD) with 6 treatments and 4 replicates in 2002-2003 in Jiroft. The treatments were: control (only nitrogen fertilizer application) (T1); application of fertilizers containing the micronutrients (T2); foliar application of pure calcium chloride (5 kg/1000 . L) (T3); T2 + T3 (T4); foliar application of pure potassium sulfate (5 kg/1000 L) (T5); T2 + T5 (T6). The basin irrigation method was used, and the trees were irrigated every 5-7 days. Foliar applications were carried out at 2A 10 and 15 weeks after pollination. One half of N-fertilizer (as urea) was applied in January with micronutrients, and the next half used in May. The results showed that, foliar application of potassium sulfate and calcium chloride with or without micronutrients addition, were more effective in decreasing the damage of the disorder. Treatments containing potassium decreased the percent of faded fruits and bunches, and subsequently, increased the yield significantly. Foliar application of potassium sulfate with or without adding micronutrients lowered the percent of faded bunches from 69% in control to 19.7% and 21.2% and faded fruits from 66.5% in control to 7.5% and 10.4% and increased the yield by 46% and 65%, respectively. For the first time, these results reveal the useful effects of potassium sulfate application (with or without micronutrients) on decreasing the date bunch fading disorder in Iran.
 
Keyword(s): POTASSIUM SULFATE, CALCIUM CHLORIDE, DATE PALM, DATE BUNCH FADING DISORDER
 
References: 
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