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Measuring and modelling of seed-applied pesticides during soybean emergence
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DOI：10.1007/s11104-026-08977-8.png)
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Abstract
En 中文
Soybean undergoes epigeal germination, and seed treatment is a common practice in soybean cultivation. However, the mechanisms governing the uptake and diffusion of seed-applied pesticides, as well as the fraction of leftover pesticides carried out of soil by the seed testa remain unclear. This study systematically applied pesticides with diverse physicochemical properties (including log P, water solubility, molar volume, and polar surface area) to soybean seeds to quantify and model their behavior. Of these pesticides, myclobutanil was sorted out to evaluate the effects of application rate on its behavior as a seed treatment. The pesticide concentration in live soybean tissues exhibited a unimodal relationship with water solubility (Sw) of pesticides, peaking at a log Sw of 2.11. The relationship between the fraction of pesticide diffused into the soil versus log Sw showed an ‘S’-like shape, while the relationship between the leftover pesticides carried out of soil by the seed testa versus log Sw presented a reverse ‘S’-like shape. Boltzmann models were established to simulate these relationships. At each dose rate, the concentration of myclobutanil in cotyledons was many times higher than in radicles. Moreover, cotyledon uptake accounted for > 93.8% of the total uptake by soybean live tissues. Water solubility is a key factor influencing the behavior of seed-applied pesticides during soybean emergence. Cotyledon uptake, rather than radicle uptake, serves as the dominant pathway for uptake of soybean seed treatments, though plant roots are known for their strong capacity to take up chemicals from the soil.
Keywords:
Soybean
Seed treatment
Water solubility
Soil moisture content
Uptake
Diffusion
Seed treatment leftover
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