No abstract

Guava is one of the most promising fruit crops of India and is considered to be one of the exquisite nutritionally valuable and remunerative crops. We are unaware of any report describing macro and micronutrient dynamics in fruit at different growth stages of guava. For conducting this experiment fruit of variety Allahabad Safeda, L-49, Lalit, Shweta, Arka Kiran, Salithong, Kimchu were collected at different stages like marble, seed hardening and harvest stage for estimation of primary nutrient (N, P, K), secondary nutrient (Ca, Mg) and micronutrient (Fe, Mn, Zn, Cu). As regards the availability of mineral nutrient contents of varieties did not follow definite trend.  The nutrient content particularly N, and K were recorded highest at marble stage while as Mg and Ca was accumulated maximum in stone hardening stage and P, Zn, Fe, Cu, Mg and Mn was in harvesting stage. There was least variation was observed in Mg content. Finally, it may be concluded that for the improvement of yields and quality requirement of specific mineral and nutrients is required at different growth stages.

Flowering and fruiting behaviour studied in five important cultivars of mango viz. Langra, Bombai, Zardalu, Bangalora and Hemsagar. The bud break, the appearance of 50% flower in panicle and fruit set was noticed in different time among the cultivars. The flowering intensity (%), the percentage of hermaphrodite flower (%), inflorescence shape and colour, inflorescence length and breadth (cm) significantly differed among the cultivars. The fruiting behaviour like fruit set (%), fruit drop (%), number of fruits per tree and fruit weight (g) was also significantly varied among the cultivars. The earlier bud break, the appearance of 50% flower in panicle and fruit set was observed in cv. Bombai and late in cv. Hemsagar during both the years 2015 and 2016. The statistically pooled result of the year 2015 and 2016 recorded the maximum flowering intensity percentage (62.05%) and inflorescence length (27.72cm) was observed in cv. Bangalora, whereas a higher percentage of hermaphrodite flowers (16.55%) and inflorescence breadth (21.00cm) was in cv. Zardalu. In respect to maximum fruit set per cent (2.82%) was found in cv. Hemsagar, maximum fruit drop per cent (97.70%) in cv. Langra, a higher number of fruits per tree (348.25 fruits/tree) in cv. Bombai and maximum fruit weight (490.11g) in cv. Bangalore.

The palmyrah palm (Borassus flabellifer L) is a minor tropical fruit which belongs to family Arecaceae. India stands first in the world in terms of its wealth of palmyrah palm with a population nearly 122 million palms. The fruits, fruit sap, young tuberous seedlings of palmyrah palm are used as food. Despite this indisputable utility, with the exception of coconut, arecanut, date and oil palm, somewhat less attention has been given to the improvement of palms as compared to other tree crops. An experiment was conducted at BAU, Sabour during the year 2016-2017 to study the biochemical properties of Palmyrah palm fruit collected from Bhagalpur district. The finding had shown that TSS differed significantly among the different accession of palmyrah fruit and highest TSS was recorded in AC-3 (15.96 o Brix). Maximum acidity was found in AC-3 i.e. 0.97% and minimum in AC-13. Results also revealed significant variation in Total sugar, reducing sugar and non reducing sugar among all the accession of palmyrah fruit. Result revealed that phenols and carotenoids have been found non significant in palmyrah fruit but fruit is good source of carotenoids.

Low fruit setting and heavy fruit drop in cv. Langra is a serious problem for mango growers despite the profuse flowering, good fruit setting. Some chemicals like Calcium nitrate, Boric and Sorbitol are able to minimize the loss. The experiment was conducted during the two successive seasons in the years 2012 & 2013 on mango (Mangifera indica L.) cv. Langra with treatments T1-( Calcium