PJB-2018-729
Puma super combined with urea improved photosynthesis, weeds control, and yield of potato (Solanum tuberosumL.)
JINHUA ZHANG
Abstract
Objective: The aim of this study was to investigate the effect of combined application of Puma super and urea on potato photosynthesis, weeds control, and yields. Methods: Field experiment was carried out as a randomized block and split-plot design. Potato seedlings were sprayed with urea (0, 1, 2, 4, 8, and 5g/L) and Puma super (0, 1.33, 2.66, 5.32, and 7.98 mL/L) successively. Chlorophyll content index (CCI), photosynthetic parameters, weeds control efficiency and potato yields were measured. Results: Puma super stress promoted a reduction in CCI, net photosynthetic rate (Pn), and stomatal conductance (gs), along with an increasing intercellular CO2 (Ci). Due to its adverse effects on photosystem II activity, PSII maximum photochemical efficiency, PSII activity, and PSII quantum efficiency (ФPSII) appeared obviously decline. Besides, photochemical quenching coefficient was also decreased. It suggested that Puma super disturbed PSII and blocked the electron transport in light reaction. Moderated urea application (1, 2, and 4 g/L) antagonized the toxic of Puma super, while, excess dosage of urea (8 g/L) aggravated the herbicides-toxic. Spraying with 4 g/L urea combined with 1.33 mL/L Puma super increased the Pn, weeds control efficiency, and potato tuber yields by 36.12%, 11.35%, and 11% compared to Puma super treatment alone. Conclusion: Moderate urea treatment could alleviate the side effect of herbicides Puma super on the potato seedlings by increasing photosynthesis, weed control efficiency, and production. Our results provided a recommended dose of Puma super and urea application of potato planting.
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