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S. K. Jawandha ¹, M. S. Gill ¹, N. P. Singh ¹, P. P. S. Gill ¹, Navtej Singh ¹

Affiliations
1 Department of Fruit Science, Punjab Agricultural University, Ludhiana, Punjab, IN

Abstract

Mango is a perishable fruit and its ripening period coincides with the summer months under north Indian conditions. It has very short life at ambient temperature and high post-harvest losses. Keeping it in view, an experiment was planned to study the effect of putrescine and LDPE packaging on storage life and quality of mango fruits cv. Langra. Physiologically mature and uniform fruits of mango were treated with putrescine @0.0, 1.0, 2.0 and 3.0 mmolL-1. Treated fruits were air dried in shade and packed individually in perforated LDPE bags before storage at 130 C and 85-90 per cent RH for 4 weeks. Results revealed that fruits treated with putrescine @2.0 mmolL-1 alongwith LDPE packaging retained best quality in terms of high palatability rating, good blend of TSS and acidity and low physiological loss in weight and spoilage percentage

Keywords

Polyamine, Mangifera Indica, Palatability Rating, Spoilage, Quality

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Judgepreet Singh , P. P. S. Gill ¹, S. K. Jawandha ²

Affiliations
1 Department of Fruit Science, Punjab Agricultural University, Ludhiana Punjab, IN
2 Department of Fruit Science, Punjab Agricultural University, Ludhiana Punjab, IN

Abstract

Mango is a climacteric fruit and highly perishable in nature. To maintain the post-harvest quality in mango cv. Langra, fruits were treated with calcium chloride (2.0, 4.0 %) and gibberellic acid (100, 200 ppm) or combined with LDPE packaging. Treated fruits were placed in CFB boxes and subsequently stored at 13±10C with 90-95% RH for 34 days. The effectiveness of treatments in extending fruit shelf life was evaluated by determining fruit firmness, TSS, acidity and vitamin C content. All LDPE packed fruits maintained higher fruit firmness as compared to non LDPE treatments and control. TSS contents improved throughout storage in LDPE treatments while in others these increased sharply up to 27 days and then a decline was noticed. Various treatments delayed reduction of acid and vitamin C contents during storage over the control. Results indicated that calcium chloride @ 2% + LDPE treatment were found significantly effective in maintaining firmness, total soluble solids, titratable acidity and retaining more ascorbic acid at the end of the storage

Keywords

Mango,CaCl2, LDPE Packaging, Low Temperature Storage, Fruit Quality

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Tanjeet Singh Chahal ¹, P. P. S. Gill ²

Affiliations
1 Fruit Research Station, Punjab Agricultural University, Jallowal-Lesriwla, Jalandhar - 141004, Punjab, IN
2 Department of Fruit Science, Punjab Agricultural University, Jallowal-Lesriwla, Jalandhar - 141004, Punjab, IN

Abstract

Evaluation of different sweet orange cultivars on three ischolar_mainstocks was conducted during 2012 and 2013. Different ischolar_mainstock scion interactions influenced vegetative, fruit quality and yield characteristics. Vernia, Olinda Valencia and Rhode Red sweet orange varieties under the study were found to produce tall plants while Midknight Valencia had maximum dwarfing character. Similar results of these varieties were observed for canopy volume also. Volkameriana was found to produce significantly more vigorous plants then the other two trifoliate ischolar_mainstocks. The scion circumference was maximum in Vernia and minimum in Midknight. Combination of Olinda Valencia and Benton resulted into maximum scion circumference. Influence of scion variety on stock circumference was maximum with Olinda Valencia while among ischolar_mainstocks Volkameriana contributed maximum for this parameter. As per fruit quality parameters, Olinda recorded maximum value for fruit weight, peel weight and percent juice content. Highest TSS level was also observed in Olinda while Midknight recorded maximum value for acidic content. Hamlin was found to generate maximum yield efficiency with Trovita and Rhode Red statistically at par with it. Stock-scion combination of Trovita budded on Volkameriana registered maximum yield efficiency.

Keywords

Citrus, Rootstock and Scion, Sweet Orange

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P. P. S. Gill ¹, M. Kumar ¹, N. P. Singh ¹, W. S. Dhillon ²

Affiliations
1 Department of Fruit Science, Punjab Agricultural University, Ludhiana-141004, IN
2 Punjab Horticultural Post Harvest Technology Centre, Ludhiana, IN

Abstract

An investigation was carried out to study the influence of different levels of NPK fertilizers on plant growth, fruit yield and quality, and leaf NPK content in pomegranate cv. Kandhari under sub-tropical conditions. Graded doses of nitrogen (0-300g/plant), phosphorus (0-150g/plant) and potassium (0-300g/plant) fertilizers were applied through soil, in addition to a basal dose of FYM. Control plants were fed FYM only. Maximum increase in plant growth and fruit yield was recorded in plants receiving NPK @ 300:50:100g/plant, while Control plants registered least growth and yield. Potassium levels improved fruit weight over the Control. Higher dose of potassium also improved fruit colour and enhanced peel thickness and grain weight. Maximum TSS:acid ratio was seen with NPK @ 200:50:100g/plant. Reducing sugars were not affected by any treatment. Leaf N, P and K content increased with application of the respective nutrient.

Keywords

Pomegranate, Macronutrients, Growth, Yield, Quality, Leaf Analysis.

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P. P. S. Gill ¹, J. S. Bal ¹

Affiliations
1 Department of Horticulture, Punjab Agricultural University, Ludhiana - 141 004, Punjab, IN

Abstract

The effect of foliar spray of plant growth regulators and nutrients on fruit drop, fruit size and quality was studied in ber cv Sanuar-2 at Krishi Vigyan Kendra, Hoshiarpur, Punjab Agricultural University, Ludhiana, during 2005-2006. Plants were sprayed with NAA (20, 30 or 40 ppm), KNO₃ (0.5, 1.0 or 1.5%) and ZnSO₄

Keywords

Ber, Fruit Drop, Fruit Quality, Plant Growth Regulators, Nutrients.

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S. K. Jawandha ¹, J. S. Randhawa ¹, P. P. S. Gill ¹, Jagjit Singh ¹

Affiliations
1 Department of Horticulture, Punjab Agricultural University, Ludhiana – 141 004, IN

Abstract

An experiment was conducted to study the effect of post-harvest sprays of CaCl₂ (@ 0.5%, 1.0%&2.0%), Ca(NO₃)₂ (@ 0.5%, 1.0%&2.0%), GA₃ (@ 20, 40 and 60 ppm) and Bavistin (0.1%) on storage quality of 'Umran' ber'. Fruits of uniform size were harvested at physiological maturity and treated with various chemicals. Treated fruits were placed in CFB boxes and placed in cold storage (3-5 °C and 85-95% RH). Stored fruits were evaluated at 10, 20 and 30 days from storage for palatability rating, TSS, acidity, Vitamin C and total sugars. After 30 days from storage, the highest palatability rating was recorded in GA₃ (60 ppm) treated fruits, followed by CaCl₂ (2.0%). Both TSS and Total sugars showed a similar trend of increase upto 20 days from storage, followed by a decrease. However, acidity and Vitamin C content of fruits decreased continuously with advancement of storage period. At the end of storage, maximum TSS, total acidity Vitamin C and total sugars were observed in GA₃ (60 ppm) treated fruits, followed by CaCl₂ (2.0%). Studies revealed that GA₃ (60 ppm) treated ber fruits maintained very good quality at 20 days of cold storage.

Keywords

Ber, GA₃, Calcium, Post-Harvest Treatment, Cold Storage.

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