A「few standing grain plants」make little sense as one SECOND in time, or one SECOND of degree of arc. Depicts timing the duration between similar events:「head of woody with continuous stream of emissions sliding down」「bobbing head as it repeatedly reaches the limit」and then drips the discharge. Or「standing grain plants」and「young, streaming head」bobbing up and down only for「a short time and short distance」in the breeze. Span of time between these motion cycles perhaps thought to occur about once per SECOND, rising to straighten a bit only to be pushed down by the breeze again (or, the mass of accumulating gleet at the stalk tip interacting with the force of gravity), only to rise up and repeat the motion, etc.
　A BEARD OF GRAIN, AWNS, and the fibers protruding from the tip of a ripe ear of corn, CORNSILK, as well as the pollen-producing TASSELS at the stalk tip.
　All of the above explanations conjure images of premature ejaculation perhaps in seconds during the initial experiences of a male youth, either with a partner or while going it alone during a selfie which often occurs with some degree of arcing, but especially describes the constant drip, drip, drip of gonorrhea that occurs once a second or so, as it were.
　「Repeatedly bobbing head and reaching the limit」with the appearance of SILKY FLOWING: during ovulation of a female human and estrus of other animals, the individual can become more sexually aroused than at any other time. Adding a dildo and/or an actual penis with enthusiastic action acts just like a kitchen whisk with frothy white discharges whipped up and resembling egg white meringue, mousse, cotton tufts and tassels, or sheep wool, and when observed causes great excitement. Froth is pumped out spurting from the vaginal orifice about once per SECOND as the muscles contract and release during successive waves of orgasm, forming what appears to be a white BEARD below a quivering「mouth, orifice」
　「As a woman's cycle progresses, the mucus secreted from the cervix will change due to hormonal fluctuations. A woman is considered to be ovulating and fertile when the mucus is clear, stretchy and slippery, and looks like egg whites.」
　　[　https://ic.steadyhealth.com/most-fertile-cervical-mucus 2017-05-03　]　

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: second (of time); unit of angle or arc equivalent to one sixtieth of a degree
Japanese: second
Unihan extended: beard of grain or corn; a second
EDRDG: second (1/60 minute)