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We report on the variation in the single-pulse emission from PSR J1900+4221(CRAFTS 19C10) observed at frequency centered at 1.25 GHz using theFive-hundred-meter Aperture Spherical radio Telescope. The integrated pulseprofile shows two distinct components, referred to here as the leading andtrailing components, with the latter component also containing a third weakcomponent. The single-pulse sequence reveals different emissions demonstratingas nulling, regular, and bright pulses, each with a particular abundance andduration distribution. There also exists pulses that follow a log-normaldistribution suggesting the possibility of another emission, in which thepulsar is radiating weakly. Changes in the profile shape are seen acrossdifferent emissions. We examine the emission variations in the leading andtrailing components collectively and separately, and find moderate correlationbetween the two components. The inclination angle is estimated to be about7{\deg} based on pulse-width, and we discuss that nulling in this pulsar doesnot seem to show correlation with age and rotation period.

Emission Variation of a Long-period Pulsar Discovered by the Five-hundred-meter Aperture Spherical Radio Telescope (FAST)