The study was carried out at Post Harvest Laboratory, College of Agriculture, JNKVV, Jabalpur during the year 2018, on various ripening related changes in guava fruits to determine appropriate maturity stage and postharvest treatment for better quality and desirable shelf life under room storage. Effect of post harvest treatments with Calcium chloride (1and 2%), Calcium nitrate (0.5 and 1%) and Azadirachta decoction (10 and 20%) on the storage behaviour of guava fruits harvested at colour turning stages during storage at room temperature were studied. Fruits were kept in tray and dipped each for (2 or 4) minutes, storage at room temperature and evaluated after 3, 6, 9 and 12 days for various physico-chemical attributes like. The maximum physiological weight loss (23.34%) in untreated fruits and minimum (16.59%) in calcium nitrate (1%) treated, the maximum fruit length of (5.50cm) was recorded in calcium nitrate (1%) treated and the minimum (4.33cm) in control, the maximum fruit diameter (5.92cm) was recorded under calcium nitrate (1%) treatment and minimum (5.28cm) under control treatment, the maximum fruit volume was recorded (125.27ml) under calcium nitrate (1%) treated fruit treatment and the minimum (92.80ml) in control, the maximum fruit decay percent was recorded in T1 (control) 12.38 % and minimum 6.14 % was recorded in the Azadirachta decoction treatment fruits after 9th and 12 th days. No decayed fruits were observed among all calcium treatments at the end of storage period (12 days), the maximum total sugar was recorded (7.09%) in calcium nitrate (1%) treated and minimum (6.23%) in untreated fruits. It was observed that PLW increased, fruits length, diameter and volume decreased during storage irrespective of maturity stages and Calcium treatments studied. Total sugar, increased upto 6 days with all the treatments except control but subsequently decreased thereafter during storage. However, mature green stage fruits exhibited longer shelf life and better fruit quality with all the Calcium treatments compared to calcium treatments stage during storage. Similarly, calcium proved beneficial in delaying the ripening related changes in guava fruits, while application of Ca(NO3)2 (1%) recorded a potential shelf life of 12 days under storage.

Background: Rough-skin disorder mainly occurs in 6-12 years old young and senile orchards of Nagpur mandarin due to excess application or availability of potassium. The characteristics of rough-skinned fruits are large fruit size with rough textured peel, segments are loose intact with rind, improper fruit shape (fruit length to breadth ratio is equal to one or more than one), reduced juice per cent and TSS. Methods: Based on the incidence of rough-skin disorder, an orchard of Nagpur mandarin was earmarked at Hetikundi village of Wardha district, Maharashtra for Mrig bahar during 2020. The selected orchards are 10 years old, spaced at 6 m x 6 m and grafted on Rangpur lime rootstock. At harvest, yield and yield attributes, fruit physical characteristics and critical quality characteristics viz. TSS, acidity, TSS/ acidity ratio and vitamin C content of disordered and normal fruits were recorded according to treatments. Result: Foliar application of plant growth regulators like 2,4-D 15 ppm and GA3 15 ppm and reducing soil application of potassium in high potassium available soils reduced the rough skin and improved the rind texture and physicochemical characteristics at harvesting in mrig bahar.

Mature and ripe fruit of eight recognized cultivars (Lucknow-49, Allahabad Safeda, Lalit, Shweta, Apple Colour, Chittidar, Banarasi Surkha and Gorakh Bilas Pasand) were selected for investigation. The data on biochemical composition revealed that TSS ( 13.58 o Brix), Sugar (11.36%), Reducing sugar (7.28%), Pectin (2.01%) and vitamin-C content (319.60 mg/ 100 g pulp) were found to be higher in Lucknow-49 when compared to the other cultivars. Acidity (0.836%) highest in Banarasi Surkha while pH (5.89) comparatively highest in Shweta among cultivars.