Articles

EFFECT OF TWO POTASSIUM FERTILIZERS WITH BALANCED REQUIREMENT OF OTHER NUTRIENTS ON QUANTITATIVE AND QUALITATIVE CHARACTERISTICS OF APPLE FRUIT TREES (‘RED DELICIOUS’)

Article number
877_24
Pages
229 – 234
Language
English
Abstract
This experiment was carried out in the apple (Malus domestica Borkh) orchards of Padena region of Semirom township in Esfahan.
The experiment was a completely randomized block test with 11 treatments and 6 replications that included the evaluation of the effect of two potassium sources along with obtaining a balanced requirement of other nutrients on the yield and quality of ‘Red Delicious’ apple fruits.
Fertilizer treatments included potassium chloride or potassium sulfate at the rates of 1 or 2 kg/tree with N and P-fertilizers and micronutrients; and a control based on the farmers conventional fertilizer practice.
The results, though statistically insignificant at 5% level, showed yield improvements with the application of potassium fertilizers.
Different levels of potassium treatment caused quality improvements such as higher specific weight, and more total soluble solids (TSS). No obvious Cl hazards were seen on the apple trees and no adverse effects on yields either due to the Cl of potassium chloride as compared with potassium sulfate.
There were no differences in yield or quality characteristics of the apple fruits between the first year and the second year of trials indicating a good mobility for applied potassium.
Considering the fact that both the soil available potassium and the potassium content of the apple leaves in the control experiment were higher than the standards (1.70%), application of potassium fertilizers irrespective of their source would not be recommended here.
The results of these experiments during the two-year period showed that no potassium applications are recommended for soils where available potassium exceeds the critical level of 300 mg/kg or where the leaf potassium measures at 1.70%.

Publication
Authors
M. Jafarpour
Keywords
‘Red Delicious’, potassium chloride, potassium sulfate, deep placement of plant nutrients, storage, fruit firmness
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