RESPONSE OF SUGAR PEAS TO PRE-HARVEST FOLIAR SPRAY WITH POTASSIUM, PASSIVELY MODIFIED ATMOSPHERE PACKAGING, AND PERIOD OF STORAGE UNDER COLD CONDITIONS | ||||
| Journal of Plant Production | ||||
| Article 17, Volume 29, Issue 6, June 2004, Page 3481-3494 PDF (2.03 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2004.238667 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Kh. A. Soliman, | ||||
| Dept. Postharvest (Veg. Crops). Sabahia Hort. Res. Stat.; Hort. Res. lnstit. ARC. | ||||
| Abstract | ||||
| This study was carriec oul in two growing seasons. 1999 and 2000. to investigate the effect of foliar application of potassium (0, 200. 400 and 600 ppm) and size of package (polystyrene trays of 250 and 500 capacities. over - wrapped with transparent pliofilm sheets) on the quality of Sugar peas (cv. Toledo). during cold storage for different periods of time (At harvest. 8 and 16 days). The obtained results indicated that spraying peas plants with potassium yielded peas pods that suffered high losses in both fresh weight and moisture content during storage, compared to control. though the differences among treatments appeared insignificant. However. the detected losses were in proportion to the used concentration of potasslorn. Chlorophyll contents increased also as a result of potassium foliar application. especially at 600 ppm. Peas pods of better quality during storage. as perceived from the low percentages of culls. were obtained due to potassium-sprayings. regardless of the insignificant differences among potassium treatments. The scores of consumer preference were enhanced due to the application of potassium. Reducing sugars were the highest in peas pods as a result of spraying with potassium at 200 ppm; white 600 ppm increased significantly non - reducing and total sugars. The storage resutted in slight losses in both fresh weight and moisture content of pods. However, the magnitudes of such losses fell within the accepted range that did not seriously affect the pods' quality. a result that was supported by the obtained scores of consumer preference. along with elapsmq time of storage. In addition. losses in chlorophylls were slight. but significant in the second season after 16 days of storage. The great deal of the total losses was incident in the first period in both seasons. i.e .. 81.8% and 67.12%. respectively. Reducing and non - reducing sugars decreased with storage and most of the reductions were incident in the flrst term of storage as well. Packaging the peas pods in trays. generally. conserved both losses in fresh weight and moisture content at minimal. especially in the small-sized trays. Both types of packages did not significantly differ from one another in conserving the pods' chlorophyll contents as well as the consumer preference. The small- sized pacKage enhanced retaining the reducing and total sugars better than in the large - sized ones; but both packages did not affect pods' total sugars content. | ||||
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