Abstract
Three types of tomato seedlings viz., polybag raised seedlings (polybag seedling), seedbed raised seedlings (normal seedling) and grafted seedlings (tomato grafted on wild brinjal) of BARI hybrid tomato-4 were evaluated under with and without hormone application system during the summer season of 2014 at the experimental field of Sylhet Agricultural University with view to assessing the influence of grafting and hormone application on tomato yield during summer. Seedling types had significant influence on fruit yield and plant mortality. Only 3.5% plants were infected with bacterial wilt when grown from grafted seedling while it was 18% and 20% when the plants raised from normal and polybag grown seedling, respectively. Thus the higher survivability of plants in the grafted plot ensured much higher fruit yield acre-1 (18 ton) than those of normal seedling (13.15 ton) and polybag grown seedling (12.80 ton). Application of paracholorophenoxy acetic acid had significant influence on higher tomato production. The plants applied with hormone produced 979.50 g of fruits plant-1 while it was only 724.48 g in untreated plant. However, the highest fruit yield plant-1 was recorded from the grafted tomato plants (1.06 kg) and normal seedling grown plant (1.08 kg) when treated with hormone while it was the lowest for normal types of seedling at without hormone application (0.59 kg plant-1). Results revealed that the high scope of improving tomato yield during summer using grafted seedling along with hormone application in Sylhet region.
Keywords: Production, grafted tomato seedlings and Sylhet region

Keywords: Production, grafted tomato seedlings and Sylhet region

Organic fertilizer is a major limiting factor in crop production, especially for vegetables during the winter season in Bangladesh. Recently, an experiment was conducted at ARS, BARI, Satkhira on three types of organic fertilizer (OF) like OF from Co-compost (Faecal Sludge and Municipal Solid Waste), OF from earthworm compost (Vermicompost) and OF from cowdung whereas chemical fertilizer were applied as control treatment. Now a day’s farmers are cultivating tomato in saline areas and normally they do not use any compost fertilizers at their field as an organic fertilizer, therefore, it is urgent to find out the suitable combining dose of different types of compost and chemical fertilizers for maximizing the yield or know the best combination of chemical and organic fertilizer as well as the economic benefit from best treatment considering soil health. For this reason, this experiment was conducted in RCBD design with three dispersed replications in the winter season 2016-17 at ARS, Satkhira. Four fertilizer doses viz., T1 = 100% Chemical Fertilizer (Soil Test Based, FRG, 2012), T2 = Co-compost @ 2 t ha-1 with 50% recommended dose of chemical fertilizer (RDF), T3 = Vermicompost @ 2 t ha-1 with 50% RDF, T4= Cowdung @ 5 t ha-1; were set as the treatments. Tomato (BARI Tomato-14) was planted on 15 November 2016; during final land preparation following proper methodology. Only four irrigations were applied after 10, 25 and 35 and 45 days after plantation. It was found that treatment T2 gave the highest yield (45.94 t ha-1) followed by T3 (42.16 t ha-1), T1 (32.50 t ha-1) and T4 (32.50 t ha-1). From the economic study, it was found that higher income obtained from using co-compost along with chemical fertilizer (198825 Tk. ha-1) followed by T3 (155025 Tk. ha-1), T1 (118025 Tk. ha-1) and T4 (190575 Tk. ha-1). Now, it is clear that 2 ton co-compost with 50% inorganic fertilizer from Recommended Dose of Fertilizer (RDF) gave the highest yield with economic benefit. Also soil salinity was recorded minimum in co-compost treated plot.

Keywords: Vermicompost, co-compost, cowdung, tomato, saline soil.

An attempt was made to evaluate the impact of Tomato Spotted Wilt Virus (TSWV) on root depth, fresh root weight, dry root weight plant-1 and yield of twenty tomato varieties namely BARI Tomato-1, BARI Tomato-2, BARI Tomato-3, BARI Tomato-4, BARI Tomato-5, BARI Tomato-6, BARI Tomato-7, BARI Tomato-8, BARI Tomato-9, BARI Tomato-10, BARI Tomato-11, BARI Tomato-12, BARI Tomato-13, BARI Tomato-14, Roma VF T-311, Unnayan F1, Udayan F1, Rio Grande, Tidy and Digonta. The study was conducted at Amtoli Upazilla in Barguna district under the AEZ 18 in Bangladesh during winter season of 2008-09. BARI-T2 showed the highest (45.19%) reduction of root depth and the lowest (30.18%) reduction was recorded in Digonta. The percent reduction of fresh root weight plant-1 was highest (46.94%) in BARI-T1 and lowest (28.11%) in Rio Grande. The percent reduction of dry root weight plant-1 was lowest (32.73%) in BARI-T11 and highest (44.12%) in Roma VF. The fruit yield reduction was observed higher due to early infection (67-87%) followed by mid (40-56%) and late infection (20-29%) stages in all the varieties. The highest fruit yield reduction was obtained in BARI-T2 at early stage of infection and the lowest in BARI-T10 at late infection stage. The reduction of fruit yield plant-1 was ranged from 44.10-55.68% depending on tomato varieties. The highest fruit yield reduction was recorded in BARI-T2, while the lowest in BARI-T12 due to TSWV infection

Keywords: Tomato spotted wilt virus, tomato, root, impact