บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Nitrogen and post-harvest yellowing of Brussels sprouts.

Everaarts, A. P.;

Acta Horticulturae Year: 2000 Issue: No. 533 Pages: 393-396 Ref: 3 ref.

2000

บทคัดย่อ

Nitrogen and post-harvest yellowing of Brussels sprouts.

A field experiment was undertaken in Lelystad, Netherlands, in 1996, to investigate the effect of pre-harvest application of N on the yellowing of Brussels sprouts cv. Maximus at harvest and postharvest. Modular-raised transplants were planted on marine loam soil (supplied with 162 kg calcium ammonium nitrate at planting and a further 49 kg/ha 114 days after planting (DAP))and treated with: (1) no N application (control), (2) application of 31 kg N/ha as granular calcium nitrate, or (3) application of 0, 3, 6, 12 or 24 kg N/ha as urea, at 127 days after planting (DAP). The sprouts were harvested at 140 and 155 DAP. At harvest, sprouts of size grades 18-30 (small) and 30-41 mm diameter (large), held at 90% RH and 12 deg C, were evaluated for yellowing every 2 to 3 days for 17 days. Average marketable yield was 19.1 t/ha at the first harvest and 27.8 t/ha at the second harvest. N concentration in the outer leaves of large sprouts was lower than in small sprouts. For both size grades, N application

 as urea at 12 or 24 kg/ha, or for the smaller sprouts calcium nitrate at 31 kg/ha resulted in increased N content in the outer leaves of sprouts. Ten days after the first harvest, N had no effect on the yellowing of small sprouts, but the application of 31 kg N/ha as calcium nitrate resulted in increased yellowing of large sprouts. At the second harvest, no effect of N was observed. Independent of N treatment (control), the large sprouts showed more yellowing than young sprouts. Yellowing was also more marked for the second harvest.