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چکیده
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Carryover injury caused by premix herbicide Lumax®537.5SE has not been studied. This study documents this event and aims to support or reject the following hypothesis under field conditions: a crop treated with melatonin, a plant hormone, can tolerate herbicide carryover–induced stress. A split-plot design was arranged in a randomized complete block design (RCBD). Main plots were 0, 4, and 6 L ha−1 Lumax®537.5SE applied 11 months before planting. Subplots were non-treated control and melatonin applied at 1 mM in the manners of seed tuber application, single foliar application, single foliar + seed tuber application, double foliar application, and double foliar + seed tuber application. Without Lumax®537.5SE, single foliar application of melatonin increased the yields of marketable No. 1 (20%), unmarketable (34%), and total (15%) tubers compared to control. The double foliar application of melatonin caused a further increase in the yields. The carryover of Lumax®537.5SE injured potato by reducing and cracking its tubers in a dose-dependent manner. Without Lumax®537.5SE, no cracked tuber was harvested, while with 4 and 6 L ha−1, 0.46 and 0.63 kg m−2 tubers were cracked, respectively. The seed tuber application of melatonin did not affect improving potato and mitigating it against Lumax®537.5SE carryover. Other melatonin treatments reduced cracks in the tubers, improving the yields. Quality and quantity loss of tubers caused by Lumax®537.5SE carryover could be mitigated by foliar-applying melatonin twice.
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