International Symposium on
Drylands Ecology and Human Security
A Study on the Effect of Potassium on Growth
Peiman Jafari & Hamid Molahoseini
Isfahan Agricultural Research Center, Isfahan, Iran
This study carried out to evaluate the effect of potassium(K2O) on salt tolerance of watermelon cultivars in Eshragh Industrial and Farming Company that situated at the south west of Varamin. The experiment design was split plot as follow: Main factor wasWatermelon cultivars including Sugar baby (Su), Charleston Grey (Ch) and Crimson Sweet (Cr). Sub factor was different rates of Potassium (K2O) as potassium sulfate (K2SO4) including: Control (K0), use of Potassium (K2O) base on soil test (K25), use of Potassium (K2O) base on two and three times more than soil test results (K50, K75). The other necessary nutrition applied according to the soil test results. The result of combined analysis variance showed that there was highly significant difference (P≤%1) in weight of total fruit, weight of one fruit and fruit number per plant in all treatments . Fruit skin thickness and weight of 1000 seed were highly significant difference (P≤%1) in cultivar treatments and Total Soluble Solids was highly significant difference (P≤%1) in potassium (K2O) treatments. The mean comparisons of results according to Duncan`s multiple range test showed that the highest weight of total fruit and weight of one fruit were 39.1 Ton.ha-1 and 3.1 kg in ChK75 treatment respectively and the highest fruit number per plant was 1.5 in SuK75 treatment, which all were located in A class. On the whole ,base on results of this experiment, extra use of K2O in the saline soils under watermelon cultivation, prevention of yield decrease due to salinity.
Keywords: Watermelon, Salt Tolerance, Potassium