Polymer coating in soybean seed treatment and their relation to leaching of chemicals

Abstract

This study evaluated the physiological quality and quantified the efficiency of polymer in reducing the loss of phytosanitary products by leaching from soybean seeds of different diameters and in different treatments. Two lots of seed and two types of treatments were tested: polymers associated with seed treatment, and polymer application in layers after the seed treatment. For that, the following treatments were analyzed: Control= no seed treatment; Treat+pol= seed treatment + polymers in the mix; Treat/pol= seed treatment + polymers applied in layers; Treat= seed treatment. To evaluate seed treatment retention by the polymers, extraction equipment was employed and leaching of the active ingredient thiamethoxam was quantified. Evaluation of physical quality was conducted with tests of germination rate, first count, emergence rate, accelerated aging, seedling length, seedling dry mass and moisture content. Polymer application associated with seed treatment was efficient in reducing losses by leaching, reducing product loss by 20%. No significant differences in retention and physiological quality were found when different methods for polymer application were compared. Bigger seeds presented greater vigor, but the germination rate was unaffected.

Comparative effect of seed treatment with thyme essential oil and Paraburkholderia phytofirmans on growth, photosynthetic capacity, grain yield, δ15N and δ13C of durum wheat under drought and heat stress

“…Coating seeds with bioactive compounds shows promise as an alternative for improving the adherence and controlling the amount of bioactive compound applied (Ludwig et al, 2020). In addition, this technique favours better seed germination, seedling establishment, nutrient uptake and plant tolerance to biotic and abiotic stresses (Kaufman, 1991; Lutts et al, 2016; Tavares et al, 2013), therefore impacting positively on crop productivity (Du Jardin, 2015).…”

Superabsorbent Polymer Seed Coating Reduces Leaching of Fungicide but Does Not Alter Their Effectiveness in Suppressing Pathogen Infestation

“…Coating of seeds with polymers is considered an innovative tool to cope with the lack of water during seed germination, but on the other hand, it can affect the effectiveness of plant protection substances used in seed dressing. It was also shown in previous studies on sand matrices that polymer seed coating can reduce the leaching of pesticides from the seeds surface [ 24 , 25 ]. However, this process in real conditions is affected by physicochemical properties of the soil, including organic matter content, pH, humidity, and it depends also on pesticide characteristics, especially solubility [ 26 ].…”

“…This may apply not only to the encapsulated substances themselves but also to seeds coated with pesticides and superabsorbents. In the experiment of Ludwig et al [ 24 ], the effectiveness of seed coating with polymer Likoseed Vermelho ® applied at a dose of 1 mL kg −1 of soybean seed in reducing the pesticide losses was quantified. The polymer was applied by two methods–as a mix with pesticides or after pesticides treatment.…”

Nematocidal Potential of Phenolic Acids: A Phytochemical Seed-Coating Approach to Soybean Cyst Nematode Management

“…The production of these defensive phytocompounds can be categorized as constitutive (phytoanticipins) or induced (phytoalexins) in which the presence of exogenous organisms or compounds can signal the induction of plant immune responses and defensive measures [ 4 , 20 , 21 ]. As global trends in pesticide use gradually shift away from conventional approaches, biopesticides and phytochemical pesticides are emerging as promising and more-sustainable alternatives [ 5 , 6 , 7 , 22 , 23 , 24 , 25 , 26 , 27 ] in conjunction with diverse application methods such as seed coating techniques [ 8 , 9 , 28 , 29 , 30 , 31 ]. Notably, the application of phytochemical or botanical nematicides [ 6 , 7 , 24 , 26 , 28 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ] has garnered increasing research interest due to their attractive qualities over conventional pesticides, such as lower toxicity, higher target specificity, lower environmental persistence, and biodegradability [ 6 ].…”