EFFECT OF DEFICIT IRRIGATION AND POTASSIUM ON LEAF AREA, CHLOROPHYLL AND PHOTOSYNTHESIS IN POTATOES

Abstract

The research was conducted to determine the leaf area index, chlorophyll content (SPAD), and photosynthesis rate of potatoes grown under different irrigation levels and different potassium doses. The study was established in Niğde Ömer Halisdemir University, Ayhan Sahenk Faculty of Agricultural Sciences and Technologies, Department of Plant Production and Technologies Research and Application Area. Three different irrigation levels (I100, I66, and I33) and six different potassium doses (0, 40, 80, 120, 160, and 200 kg/ha) were applied in this study. The experiment was established using a completely randomized design in split plots with four replications. Agria potato variety was used in this experiment. This variety is heavily preferred by the producers in the Niğde region. As a result of the study, leaf area index values changed ranged from 4.50 – 1.01, leaf chlorophyll content (SPAD) values 49.62 – 29.37, and photosynthesis rate values 23.92 – 3.55 µmol m-2 s-1. As the amount of irrigation water decreased, it was negatively affected on the investigated properties. While I33 application was the irrigation application with the lowest results, the best results were obtained from the I100 application. Increasing doses of potassium had a positive effect but the best results were obtained from doses of 120 and 160 kg/ha. Because of these results, it is recommended to apply 120 to 160 kg/ha doses of potassium to the farmers.

Keywords

• Irrigation
• potassium
• photosynthesis
• chlorophyll
• potato

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