ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Drip fertigation with nitrogen and potassium and postharvest susceptibility to bacterial soft rot of bell peppers.

Carballo, S.J., Blankenship, S. M., Sanders, D. C. and Ritchie, D. F.

Journal of plant nutrition. Vol: 17 Issue: 7 Pages: 1175-1191

1994

บทคัดย่อ

In 1991 and 1992, drip irrigation was used to apply various rates and timings of nitrogen (N) and potassium (K) to black polyethylene plastic-mulched bell pepper (Capsicum annuum L.) to determine the effect on fruit quality and susceptibility to postharvest bacterial soft rot (Ervinia carotovora subsp. carotovora). Neither rate nor application timing affected total yield in either year. In 1991, the high fertilizer rate (266-309 kg/ha of N and K, respectively) increased class 1 yield in the first harvest and reduced total discards. In 1992, a year with a colder than average spring, the low fertilizer rate (70-81 kg/ha of NK) increased class 1 yield in the first harvest. Mid- or late-season fertigation produced more second harvest yield and less discards than the first harvest in 1991, but not in 1992. Fruits of plants fertilized with high N and K rates had greater N and dry matter concentration. No differences in color or wall thickness at harvest were detected among treatments. Stored fruits turned red slower with the late season low fertilizer rate. There were no differences in rate of weight loss during storage at 10 degrees C. No differences in progression of bacterial soft rot were detected among treatments in 1991, but the higher fertigation rates or late timing application increased resistance in 1992.