Abstract
Crop rotation improves potato ( Solanum tuberosum L.) crops; however, in some cases, it can have some negative effects due to the herbicides previously used in crops under rotation. These effects are the decline in the yield and the appearance of physiological disorders, including cracked tubers, which impair the quality and economic value of the potato. Two field experiments were performed with applications of tembotrione and atrazine, alone or in combination. In the Rio Paranaiba (Minas Gerais State) area, in clay soil, the herbicides were applied at post-emergence in corn ( Zea mays L.). After corn harvest and soil preparation, the potatoes were planted. In the Serra do Salitre (Minas Gerais State) area, in the medium texture soil, the herbicides were applied and incorporated into the soil, and the potatoes were planted the day after. No injuries were found in the shoots. Decline in the potato yield was found only in the medium texture soil (Serra do Salitre). Atrazine did not affect the quality of potato tubers. In the two areas, tembotrione promoted cracks in “Atlantic” potato tubers.
Highlights
On the world stage, potato stands out among vegetables due to having the highest consumption and the largest quantity produced - 381 million metric tons in 2014 (FAO, 2017)
The herbicides used in rotation crops such as corn and wheat can persist in the soil and impair growth and development of the potato plant
The doses of herbicides are those recommended for corn on the labels of the products sold in Brazil
Summary
Potato stands out among vegetables due to having the highest consumption and the largest quantity produced - 381 million metric tons in 2014 (FAO, 2017). Crop rotation is paramount for achieving the largest production and best quality of the potato (Campiglia, Paolini, Colla, & Mancinelli, 2009), mainly for interrupting life cycles of pests and diseases (Keiser Häberli & Stamp, 2012) and improving soil quality (Askari & Holden, 2015). Soils contaminated with herbicide residues reduce the yield of potato crops according to the cultivar used (Novo & Miranda Filho, 2006) due to the phenomenon known as herbicide carryover. Physiological disorders and the decline in the yield were observed due to sulfonylureas and imidazolinones (Eberlein & Guttieri, 1994; Eberlein, Westra, Harderlie, Withmore, & Guttieri, 1997; Novo & Miranda Filho, 2006), to auxin mimics.
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