Tuber Production, Gas Exchange, and PAR (Incident On Leaf Surface) of Potato Cultivars in Response to the Planting Patterns and Drip Irrigation System

Abstract

The performance of potato cultivars was evaluated using four planting arrangements and drip irrigation on some photosynthetic traits and tuber production and weight in Ardabil region, Iran during 2017–2018. The results showed that planting arrangement significantly affected tuber weight traits per plant, photosynthetic carbon dioxide source of leaf surface (C ref), photosynthetic active radiation of leaf surface (Q Leaf), atmospheric pressure (P), decomposed carbon dioxide of leaf surface (C ' an), decomposed water of leaf area (e ' an), and total exchanged carbon dioxide (ΔC) at 1% probability level. The highest amounts of photosynthetic traits (C ref) and (Q Leaf) in the Milva cultivar with the planting arrangement of four rows with a width of 150 cm were found to be 434.90 mg kg-1 and 10.85 μmol m-2 s-1, respectively, which increased by 17 mg kg-1 and 2.53 μmol m-2 s-1, respectively, compared to the control (two rows with a spacing of 150 cm with surface irrigation and a planting density of 53,333 plants per hectare) (R1). The high C ref resulted from removing the vacant space and from maximum use of resources. The increased Q Leaf is due to the zigzag placement of plants, received radiation level, and photosynthetically active radiation on the leaf surface. Considering acceptable changes in the studied traits, cultivating the Milva cultivar with a planting arrangement of four rows is recommended in the Ardabil region.