A field experiment was carried out in riverbed of Kanchanpur district to know the performance of cucumber varieties under different nutrients sources. The research site was facing the problem of low productivity of cucumber due to the use of indigenous variety and traditional cultivation practices. So the research was conducted to know the best variety of cucumber with different nutrients source under riverbed condition. The research was carried out from 13 th December 2016 to 15 th May 2017. The soil of experimental field was sandy loam with pH 6.2. The crop geometry was 75 cm×75cm and the size of each plot was 14.0625 m 2. The research was carried out in RCBD design with 8 treatments and 3 replications. The treatment combination used for the field experiment were FYM + Ninja-179, FYM + Malini, Poultry manure + Ninja-179, Poultry manure + Malini, Oilseed cake + Ninja-179, Oilseed cake + Malini, NPK + Ninja-179 and NPK + Malini. Data were collected on the following parameters such as vine length, number of leaves, leaf length, leaf breadth, days to first flowering, days to first fruiting, days to first fruit maturity, male and female flower ratio fruit weight, fruit length, fruit diameter and fruit yield. It is revealed that the performance of different combination of treatments, NPK + Ninja-179 was found to be the best high yielding variety for this locality with yield of 68.79 ton/ha. Besides fruit yield, the treatment combination of NPK + Ninja-179 was superior to other treatment combination in others parameters like vine length(64.67 cm), number of leaves(17.93), fruit length(21.8 cm), fruit weight (535.31g) and fruit diameter(6.00 cm). The study reveals that the treatments combination of inorganic fertilizer with Ninja variety was found to be best under riverbed condition.

A varietal study on five open pollinated cultivars of Radish viz Mino Early, Okura, Pusa Chetki, Forty Days and Miyasige with an objective to find the most superior variety was conducted at Horticultural Research Division, Khumaltar, Lalitpur in winter season for 3 years from 2016 in consecutive years. Mino Early and Forty Days are widely adopted varieties and kept as local check varieties. The trial was conducted under Randomized Complete Block Design (RCBD) with four replications. Out of the five cultivars, Okura gave significantly the highest of Root wt. (326 g), Root yield (53.85 t/ha), Root length (25.5 cm), Root diameter (53.9 mm), and Leaf wt per plant. (268 g), Days to harvest (63 days) followed by Miyasige which had Root wt (259 g), Root length (23.4 cm) Root diameter (51.9 mm), Days to harvest (66 days). Okura had 49 percent yield increment followed by Miyasige with 21.9 percent as compared to Mino Early. Hence, these two cultivars are found superior and recommended for cultivation in central mid-hills like Kathmandu valley conditions in Nepal.

The productivity of tomato in Nepal is very low due to lack of high yielding, disease and pests resistant varieties. An experiment was carried out to evaluate horticultural traits of 50 genotypes obtained from World Vegetable Centre (WorldVeg), Taiwan and SAARC region, and local collections during March to August 2020 in open field conditions at National Horticulture Research Centre, Khumaltar, Lalitpur. The objectives were to identify promising open-pollinated tomato cultivars for high yield, appropriate fruit size, and disease resistant. The experiment was carried out in a randomized complete block design with three replications. Results showed significant differences in yield and yield attributing characters including virus infection. The highest yield (39.6 mt ha-1) was produced by HRA43 and it was followed by HRA33 (26.4 mt ha-1). Among the WorldVeg OP lines, AVTO1429 produced the highest yield (16.21 mt ha-1) and it was followed by AVTO1717 (12.95 mt ha-1), AVTO0922 (11.83 mt ha-1) and AVTO1219 (11.7 mt ha-1) respectively. Most of the WorldVeg lines performed better than the check variety ‘Pusa Ruby’. Genotype HRA43, Red Local and Sindhupalchock Local were not affected by virus while Yellow Local showed 3.3% infection. Among the WorldVeg lines, AVTO1712 (20%), AVTO1717 (20%) and AVTO1718 (13%) and AVTO1219 (15%) showed less than 20% virus infection in the open field conditions. Cluster analysis using the unweighted paired group method with arithmetic mean showed that cluster-1 was the largest cluster comprised of 40 genotypes followed by cluster-2 and cluster-4. Genotypes from cluster-4 showed the higher fruit yield (25.1 mt ha-1) and resistant to the virus and the highest number of fruits per plot (1978 in 4.5 m2 area). The yield was low in cluster-1 which could be due to the heavy rainfall during the vegetative and reproductive stages. Genotypes Red Local and Sindhupalchock Local could be used in future tomato breeding program due to their resistant to TYLCV, higher potential yield and highest plant vigour in open field conditions at the mid-hill of Nepal. Considering the overall performance, genotype HRA43, HRA33 and AVTO1429 were promising lines with performance for yield and other horticultural traits.

Tomato is highly perishable in nature and incurred high post-harvest losses due to unsuitable packaging method. Experimentation was undertaken to find the effect of different polymeric film packaging on postharvest quality of tomato var. Manisha in a completely randomized block design (CRD). There was five treatment viz. open, ordinary plastic, Polypropylene (PP38,) Low-Density Polyethylene (LDPE38) and 25) which was replicated four times. Destructive and non-destructive samples were prepared for each treatment, nondestructive samples were sealed completely and used for weight loss observation and destructive samples were tied with a rubber band and used for observation of Titratable Acidity (TA), Total Soluble Solid (TSS), pH and firmness every four days after packaging. Among the different packaging treatments, no packaging (open) showed the highest percentage of weight loss (13.25%), lowest firmness (3.35 kg), and highest TSS (4.33) at the final day of storage as compared to another plastic packaging. The plastic packaging creates a modified atmosphere for the packed tomatoes which slows down the physiological processes and delay ripening, causes minimum weight loss, delays a change in color, and lower TSS content of the tomato fruit. So, packing tomatoes in any type of plastic packs is suitable for increasing shelf life.

Capsicum is one of the high value vegetable crops in Nepal. Its demand in kitchen is increasing due to urbanization and increased awareness on its health benefit. Its commercial cultivation has been started in protected as well as open field conditions. It fetches higher price in market but has very short storage life under ordinary storage condition. An experiment was carried out to evaluate the modified atmosphere packaging (MAP) on extension of shelf-life of capsicum fruit. Fruit were harvested at full mature stage with smooth and shiny appearance from farmer's field grown under protected condition at Chitwan, Nepal. The fruits were brought to postharvest laboratory of National Horticulture Research Centre, pre-cooled for 3-4 hours, cleaned with muslin cloth and packed in 25 micron Low Density Polyethylene (LDPE) packaging with different number of pinhole sized perforations viz. without pinholes, eight pinholes, sixteen pinholes, twenty four pinholes and control (without MAP). The study was conducted in completely randomized block design with five treatments and four replications. Fruits were kept at coolbot storage (9.8+2 ºC, 86+5% RH) till 30 days and analyzed for various postharvest physical, chemical and physiological parameters at every 10, 20 and 30 days of storage. The result showed that LDPE packaging influenced on reduction of physiological loss in weight (PLW), spoilage loss, ascorbic acid content, TA, freshness, firmness and shelf life. The modified atmosphere packaging (MAP) without pinholes showed the minimum PWL (1.71%) and the optimum fruit freshness (4.76) but the spoilage loss was the maximum (14%). Among the packaging, MAP with 8 pinholes maintained majority of postharvest quality retention with reduced physiological loss in weight (4.15 %), freshness (4.5) and spoilage loss (2%).