ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of temperature and postharvest field burning of Kentucky bluegrass on germination of sclerotia of Claviceps purpurea.

Johnston, W. J.; Golob, C. T.; Sitton, J. W.; Schultz, T. R.;

Plant Disease Year: 1996 Vol: 80 Issue: 7 Pages: 766-768 Ref: 14 ref.

1996

บทคัดย่อ

Sclerotia of C. purpurea were collected from Poa pratensis seed fields and exposed to various temp. regimes in a kiln. Sclerotia lost the ability to germinate when exposed to 200 deg C for 116 s, 300 deg for 48 s or 400 deg for 15 s. Exposures of 240 s at 100 and 50 deg produced a slight reduction in germination compared with controls. The effect of temp. produced by open-field and machine burning of residues was also determined. Peak soil-surface temp. produced by open-field burning of Kentucky bluegrass postharvest residue were 120 deg in 1990 and 240 deg in 1991 at Rockford, Washington, USA. An experimental machine burner produced soil-surface temp. of 280 deg in 1990 and 320 deg in 1991. Temp. at 1 and 3 cm below the soil surface did not change significantly with any field treatment. Machine and open-field burning lowered (1990) or eliminated (1991) germination of sclerotia on the soil surface. None of the treatments altered germination of sclerotia buried at 1 and 3 cm. It is concluded that

 the higher the temp. from burning residue, the greater the reduction in sclerotial viability.