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Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur

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Subject: Agroforestry × Author: Thakur, Anand × End date: 2014 × Start date: 2013 × Type: Thesis ×
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    ThesisItemOpen Access
    Influence of different pruning intensities of dalbergia sissoo on wood biomass production and yield of paddy verieties under agrisilvicultre sstem agrogorestry
    (JNKVV, 2014) Thakur, Anand; Koshta, L.D.
    ABSTRACT The present investigation entitled "Influence of different pruning intensities of Dalbergia sissoo on wood biomass and yield of paddy varieties under agrisilviculture system of agroforestry” was carried out during Kharif season 2012 at Dusty Acre Area, Department of Forestry, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (M.P.). The main objectives of this study was to find out the most appropriate pruning intensity Dalbergia sissoo for maximum production of paddy under agrisilviculture system, assessment and identification of the suitable paddy variety grown under D. sissoo and evaluation of economic viability of the system. The total 15 treatments viz. 5 pruning intensities (4 pruning treatments + 1 open) in main plot and 3 paddy varieties in subplot IR 36, MR 219, WGL 32100 were tested in strip plot design with 4 replications. Various observations on growth parameters in crop viz., germination percentage plant height; number of tillers/meter row length and yield attributes viz., effective tillers/meter row length, panicle length, number of grains/panicle, number of filled grains/panicle, 1000 grain weight, grain yield, straw yield and harvest index were recorded. In tree, various parameters viz., height, dbh, canopy spread in N-S, E-W direction, pruned biomass, cylindrical volume and stand biomass of trees were recorded. The economics of the treatments were also determined in terms of cost of cultivation, gross monetary return, net monetary returns per hectare area basis and benefit : cost ratio. Significantly highest grain and straw yield of paddy was recorded under open condition (32.40 q ha-1 and 67.70 q ha-1 respectively) where no pruning recorded Significantly lowest grain and straw yield (14.10 q ha-1 and 35.50 q ha-1 respectively) and the reduction in grain and straw yield due to shade was 56.48 % and 47.56% respectively. Among different pruning intensities, 75% pruning produced Significantly maximum grain yield (27.10q ha-1) and straw yield (58.90q ha-1) followed by 50% and 25% pruning. No pruning recorded lowest grain (14.10q ha-1) and straw yield (35.50 q ha-1). The percent reduction in grain yield under no pruning, 25%, 50% and 75% pruning over open (no tree) was 56.48%, 45.37%, 33.02% and 16.35% respectively. Paddy Variety MR-219 recorded significantly higher grain yield (26.33 q ha-1) than IR-36 (22.13 q ha-1) which in turn was significantly superior to WGL-32100 (19.30 q ha-1). The percent reduction in grain yield under IR-36 and WGL-32100 as compared to MR-219 was 15.95% and 26.69% respectively. 25% pruning recorded highest dbh (23.10cm), cylindrical volume (187.26m3 ha-1) and stand biomass (173116 kg ha-1) but at par with no pruning. Managed agroforestry system i.e. growing of crop with D. sissoo in different pruning intensities i.e. paddy + sissoo in 25% was more profitable (Rs. 39935 ha-1) as compared to crop alone (34642 ha-1) , unmanaged agroforestry system i.e. no pruning (Rs 34201ha-1) and tree alone (Rs 22400 ha-1).