Postharvest life of leafy vegetables

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W. M. I. Senavirathna 056082 Postharvest Life of Two Leafy Vegetables as Affected by the Harvesting Time of the Day

Slide 2: 

Introduction

Leafy Vegetables : 

Leafy Vegetables Perishable commodities Commercial scale cultivation is seen near urban areas Extent of cultivation is around 2,938 ha, approximate production is 39,781 t/year

Mukunuwenna(Alternanthera sessilis) : 

Mukunuwenna(Alternanthera sessilis) Family: Amaranthaceae Common in different farming situations Annual potential net income is approximately Rs. 151,200/acre

Kankung (Ipomoea aquatica L.) : 

Kankung (Ipomoea aquatica L.) Family : Convolvulaceae Grown in areas where water is abundant Annual potential net income is around Rs. 123,330/acre

Leafy vegetable Harvest : 

Leafy vegetable Harvest Appearance alters quickly Approximately 1000 kg/week is being exported to; - Middle east - Europe - Maldives Harvest at any time of the day

Objectives : 

Objectives Specific objective: To determine the best harvesting time of the day for better postharvest life General objective: Postharvest quality maintenance of leafy vegetables for export market

Materials and Methods : 

Materials and Methods Location – Food Research Unit, Department of Agriculture, Gannoruwa, Peradeniya Duration – March to July, 2008

Slide 9: 

Kankung samples - Kandy Mukunuwenna samples – Kirindiwela Leaves were harvested – without - blemishes - defects 3 – 4 weeks after previous harvesting 1” – 2” above the ground Experiment arranged in a CRD 3 treatments 6 replicates

Treatments : 

Treatments Harvested at three different times of the day T1 – 8.00 a.m. T2 – 12.00 noon T3 – 4.00 p.m. Weight of a bundle – 250g Stored in expanded polystyrene boxes in vertical position

Percentage weight loss : 

Percentage weight loss Daily weight of individual bundles was recorded for 3 days of storage Percentage weight loss = Cumulative weight loss X 100 Original weight

Total Soluble Solids (TSS) : 

Total Soluble Solids (TSS) Juice - extracted using mortar and pestle - filtered through muslin cloth Determined by using hand refractometer

Leaf yellowing : 

Leaf yellowing Evaluated daily by giving scores for all treatments 0 – No yellowing (0%) 1 – Slight yellowing (1 – 25%) 2 – Moderate yellowing (26 – 50%) 3 – High yellowing (51 – 75%) 4 – Very high yellowing (76 – 100%)

Wilting : 

Wilting Recorded daily by giving following scores 0 – No wilting (0%) 1 – Slight wilting (1 – 25%) 2 – Moderate wilting (26 – 50%) 3 – High wilting (51 – 75%) 4 – Very high wilting (76 – 100%)

Postharvest diseases : 

Postharvest diseases Evaluated daily by giving scores 0 – No diseases (0%) 1 – Slight diseases (1 – 25%) 2 – Moderate diseases (26 – 50%) 3 – High diseases (51 – 75%) 4 – Very high diseases (76 – 100%)

Shelf-life : 

Shelf-life Determined according to visual Quality Rating (VQR) Time taken to reach “VQR – 7” stage is the shelf-life Statistically analyzed by SAS package

Slide 17: 

Results and Discussion

Percentage weight loss : 

Percentage weight loss Weight loss - Highest – 12 noon Means having common superscripts are not significantly different at LSD test (0.05 level)

Total Soluble Solids (TSS) : 

Total Soluble Solids (TSS) Means having common superscripts are not significantly different at LSD test (0.05 level)

Leaf yellowing : 

Leaf yellowing Variation in yellowing incidence of kankung Variation in yellowing incidence of mukunuwenna

Wilting and Postharvest diseases : 

Wilting and Postharvest diseases No disease and wilting incidences were found during the first 3 days of storage

Shelf-life : 

Shelf-life Means having common superscripts are not significantly different at LSD test (0.05 level)

Slide 23: 

Conclusions

Slide 24: 

Kankung Leaves harvested in the evening showed significantly better postharvest life Mukunuwenna Leaves harvested in morning and evening showed significantly better postharvest life

Acknowledgements : 

Acknowledgements Mr. W. A. J. P. Wijesinghe, Program assistant, Food Research Unit, Gannoruwa, Peradeniya Mr. Wimalarathna, Food Research Unit, Gannoruwa, Peradeniya Mrs. W. K. G. S. K. Weerasinghe. Instructor, Computer Service Unit of Wayamba University of Sri Lanka

Slide 26: 

Thank You

Slide 27: 

Visual Quality Rating (VQR) 1 – None edible (76 - 100% are affected) 3 – Moderately edible (51 - 75% are affected) 5 – Fair defects (26 - 50% are affected) 7 – Good, slight defects (less than 25% are affected) 9 – Excellent (0% are affected)

Slide 28: 

1st day 2nd day 3rd day Kankung – yellowing incidence

Slide 29: 

1st day 2nd day 3rd day Mukunuwenna – yellowing incidence