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Subject: Silviculture and Agroforestry ×

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Now showing 1 - 9 of 31
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    ThesisItemOpen Access
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    ThesisItemOpen Access
    Studies on Weed Management Practices in Young Grevillea robusta Plantation
    (University of Agricultural Science, Dharwad, 2017-04) Jambagi, Basawaraj S.; Channabasappa, K.S.
    A field experiment to study weed management practices in young Grevillea robusta plantation was carried out at the farmer field near Sahasralinga, Sirsi, Uttara Kannada district by University of Agricultural Sciences Dharwad during 2015-16. The experiment was conducted in randomized complete block design with ten treatments and three replications on the one year old plantation. Twenty-five types of dicot and seven types monocot weeds belonging to sixteen families were found in experimental plot. Among weed control treatments in silver oak plantation, black polythene mulch recorded significantly lower dry weed biomass and higher weed control efficiency at different intervals of observations i.e. two, four and six months after treatment imposition. Almost 99 per cent of reduction in weed biomass and (98.93 %) weed control efficiency observed in black polythene mulch treatment compared to the control. Maximum plant height of silver oak was recorded in black polythene mulch (262 cm) followed by farmer practice (212 cm) and mixed dry leaves mulch (211 cm). These treatments were found significantly superior over other treatments. Black polythene mulch treatment (2.43 cm) recorded higher collar diameter followed by farmer practice (1.81 cm) and fertilizer bag mulch (1.79 cm), these treatments were found significantly superior over other treatments. The plant height increment per cent was higher in black polythene mulch (226.32 %) followed by milky white polythene mulch (183.08 %) and farmer’s practice (162.42 %). The plant collar diameter increment per cent was higher in black polythene mulch (326.30 %) followed by fertilizer bag mulch (189.82 %) and milky white polythene mulch (186.57 %), these treatments were found significantly superior over other treatments. Higher soil moisture content was recorded in black polythene mulch treatment compared to other treatments in the month of October and January. Black polythene mulch treatment was found to be best treatment for healthy growth of silver oak plants.
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    ThesisItemOpen Access
    Effect of Ecological Situations on Productivity of Acacia auriculiformis A. Cunn. Ex. Benth. Plantations of Varied Age Gradations in Sirsi Forest Division
    (University of Agricultural Science, Dharwad, 2017-04) Arabagonda, Vishwanath; Madiwalar, S.L.
    Productivity assessment of Acacia auriculiformis plantations of three age gradations (viz., 8, 10 and 12 years old) in different forest ranges (Sirsi, Banavasi, Hulekal, Janmane, Siddapur, Kyadagi) of Sirsi forest division was taken up and each range was considered as different ecological situation. Observations on growth parameters like total tree height, clear bole height and dbh were recorded in 10 m  10 m sample plot. As substantial area is being occupied by different Acacia species in Uttara Kannada district studies were necessary to know the variation among plantation of different age gradations within a broad zone. The results of the study revealed that total volume was highest in Kyadagi ecological situation (118.81 m3/ha) followed by Siddapur (118.05 m3/ha) at 8 years, while it was Janamne (320.02 m3/ha) followed by Hulekal (319.07 m3/ha) at 10 years and Siddapur (361.47 m3/ha) followed by Kyadagi (359.58 m3/ha) at 12 years. The carbon stock was highest in Kyadagi (32.68 t/ha), Janmane (88.00 t/ha) and Siddapur (99.40 t/ha) situations at 8, 10 and 12 year age gradations respectively. The growth and productivity parameters were positively correlated with climatic and edaphic factors in all the three age gradations. The carbon stock with respect to ecological situations was significant among all the age groups and interaction between ecological situations and age with respect to all parameters was also significant. The study indicated that locality factors such as rainfall, temperature, microclimate and edaphic factors played key role in growth and productivity of Acacia auruculiformis plantation in Sirsi forest division.
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    ThesisItemOpen Access
    Investigations on Seed Cake of Calophyllum inophyllum L. as an Organic Manure in Casuarina equisetifolia L. Nursery
    (University of Agricultural Science, Dharwad, 2017-07) Rekha Rahi; Patil, S.J.
    De-oiled seed cakes, which are considered as a waste product arising from biodiesel industries, contains beneficial nutrients for plant growth and thus, have a great potential to be used as an organic manure. In this regard, two experiments were conducted at the College of Forestry, Sirsi during 2016-17 in order to know the impact of de-oiled seed cake of Calophyllum inophyllum on the germination parameters as well as seedling growth of Casuarina equisetifolia. Both the experiments were laid in Completely Randomized Design. In first experiment, powdered de-oiled seed cake, farmyard manure (FYM) and their combinations were applied in various quantities to the potting medium. The results indicated that de-oiled seed cake of C. inophyllum had a significant impact on seed germination parameters. Out of fifteen treatments used, maximum germination percentage (47.33%), mean daily germination (0.63), peak value (0.82), germination rate (0.92) and germination value (0.52) were recorded in the potting medium containing combination of soil and sand along with 200 g FYM and 37 g cake. Results of second experiment indicated that application of different quantities of C. inophyllum seed cake (both sterilized and non-sterilized), farmyard manure, vermicompost and poultry manure significantly enhanced the growth of C. equisetifolia seedlings. Among eighteen treatments imposed, maximum seedling height (69.51 cm), collar diameter (3.53 mm), seedling fresh weight (32.93 g) and seedling dry weight (10.21 g) were recorded when 2.5 g nitrogen (N) was applied through non-sterilized cake. These findings suggest that use of de-oiled seed cake of C. inophyllum in the potting medium provided a good way to enhance the germination attributes and seedling growth of C. equisetifolia.
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    ThesisItemOpen Access
    Influence of Site Factors and Age Gradation on Productivity of Rubber (Hevea brasiliensis Muell. Arg.) Plantation
    (University of Agricultural Science, Dharwad, 2017-06) Noori, Shahbaz; Inamati, S.S.
    Biomass productivity and carbon sequestration potential of rubber plantation in two ecological zones based on annual rainfall distribution viz., Mundgod (798 mm) and Sagara (1918 mm) of Karnataka in age gradation of 4, 7 and 10 year were studied in College of Forestry, Sirsi (UAS, Dharwad) in the year 2016-2017. Observations on growth parameters such as height and diameter at breast height were recorded in 20 m × 20 m plot and average per hectare of basal area and volume productivity was calculated. Hevea brasiliensis plantation of Sagara at 4, 7 and 10 year recorded maximum volume production of 18.44 m3 ha-1, 57.65 m3 ha-1 and 119.05 m3 ha-1, respectively which may be due to favourable climatic and edaphic conditions coupled with soil nutrient fertility. While, significantly lower volume production of 9.39 m3 ha-1, 30.82 m3 ha-1 and m3 ha-1 was recorded in 4, 7 and 10 year respectively in Mundgod zone which may be due to climatic variation prevailing in the zone. In Sagara zone, carbon sequestration potential of rubber plantation recorded was significantly higher in 10 year (70.61 t ha-1), followed by 7 (37.55 t ha-1) and 4 year (15.31 t ha-1) plantation, while it recorded comparatively lower in age gradation of 10 (48.23 t ha-1), 7 (21.92 t ha-1) and 4 year (8.61 t ha-1) rubber plantation of Mundgod zone. The pH of both the zone were predominantly acidic in nature ranging from 4.29 to 4.81. The status of soil chemical properties was considerably high in Mundgod ranging from electrical conductivity (0.18 to 0.25 dS m-1), organic carbon (0.60 - 0.95 %) and primary soil nutrients such as available nitrogen (308.22 - 342.88 kg ha-1), phosphorous (25.72 - 29.30 kg ha-1) and potassium (180.30 - 199.57 kg ha-1) while Sagara zone experienced low soil nutrient fertility due to higher nutrient uptake by trees and leaching loss characterized by site.
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    ThesisItemOpen Access
    Study on Pre-Sowing Treatments and Nutrient Response in Dalbergia latifolia Roxb.
    (University of Agricultural Science, Dharwad, 2017-08) Lodh, Uday Kumar; Chavan, Raju l.
    Rose wood (Dalbergia latifolia) belongs to family Fabaceae. It is one of the most important timber yielding species in India. It is well known for producing very hard and durable wood and has high commercial value. It is used in furniture construction, manufacture of guitar sets and decorative veneers. In this regard, two experiments laid in Completely Randomized Design were conducted at the College of Forestry, Sirsi during 2016-17 in order to know the effect of eight pre-sowing treatments on seed germination and to assess the effect of integrated nutrient management (11 treatments involving poultry manure, vermicompost, FYM, mycorrhizae, NPK and their combination) on growth of seedlings. In first experiment, the results indicated that seeds treated with tap water for 12 hours recorded significantly maximum germination percentage (70.00%), mean daily germination (3.33), peak value (6.35), germination rate (5.11) and germination value (21.15) over control. Results of second experiment indicated that combined application of different quantities of poultry manure (10 g) + vermicompost + (15 g) + FYM (25 g) + mycorrhizae (10 g) + NPK (0.5 g/1 g/0.5 g) in 5″ × 8″ polybags containing potting mixture (soil, sand and FYM - 2:1:1) recorded significantly maximum seedling height (43.68 cm), collar diameter (4.96 mm), number of leaves (61.63), seedling fresh weight (73.32 g) and seedling dry weight (34.90 g) over control. Soaking seeds in tap water for 12 hrs and combined application of organic, inorganic and biofertilizers provided a good way to enhance the germination attributes and seedling growth of rosewood.
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    ThesisItemOpen Access
    Influence of De-Oiled Tree Borne Oil Seed Cakes on Germination, Vigour and Seedlings Growth of Pongamia pinnata (L.) Pierre and Dalbergia latifolia Roxb.
    (University of Agricultural Science, Dharwad) Kabbur, Shilpa Ramappa; Patil, S.J.
    The present study was conducted on the utilization of de-oiled Tree Borne Oil (TBO) seed cakes as organic manure for germination and growth of plants at the College of Forestry, Sirsi in the year 2015-16. First experiment was conducted to study the germination pattern of pongamia (Pongamia pinnata) and rosewood (Dalbergia latifolia) seeds as influenced by the leachates of neem (Azadirachta indica) and pongamia seed cakes in different concentration. The highest germination percentage (76.67 % and 98.67 %), germination rate (2.24 and 9.50), peak value (2.63 and 10.97), mean daily germination (2.19 and 2.82), germination value (5.77 and 30.92), seedling length (36.25 and 16.41), seedling vigour index (2779.17 and 1619.48) and survival percentage (100.00 % and 93.12 %) were observed in T6 (50 g of neem seed cake leachate) for pongamia and rosewood respectively. The second experiment was conducted to study the use of neem and pongamia seed cakes in potting media at different proportions in combination with soil, sand and FYM on the growth parameters of pongamia and rosewood seedlings. The maximum height (33.03 cm and 15.86 cm), collar diameter (7.50 mm and 1.73 mm) and total number of leaves (14.08 and 18.61) was recorded in treatment T4 [soil, sand, FYM (1:1:0.5) + 0.5 proportion of NC (neem cake)] at 180 DAS (days after sowing) respectively for both the species. Maximum root fresh weight (4.43 g and 0.63 g), shoot fresh weight (13.23 g and 1.82 g), root dry weight (2.28 g and 0.34 g) and shoot dry weight (6.42 g and 0.92 g) was recorded in treatment T4 at the end of the experiment respectively for pongamia and rosewood seedlings. Thus the study suggests that 50 g concentration of seed cake leachate and 0.50 proportions of seed cakes can be used in nursery for raising quality planting material.
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    ThesisItemOpen Access
    Integrated Nutrient Management in Flemingia semialata W.T. Aiton Plantation
    (University of Agricultural Sciences, Dharwad, 2016-07) Deepak Kumar; Channabasappa, K. S.
    Flemingia semialata W. T. Aiton has emerged one of the most suitable lac host plant which is bushy in nature and quick growing, and more importantly lac cultivation can be started from second year on commercial basis. Application of balanced quantity of nutrient is one of the key factor to ensure healthy growth and maintain the nutrient balance of soil and to obtain higher lac yield of Flemingia. A field experiment was carried out at Agriculture Research Station, Malagi, Uttara Kannada district during 2015-16 on “Integrated Nutrient Management in Flemingia semialata W.T. Aiton Plantation”. The experiment was conducted in randomized complete block design with ten treatments and three replications. Among the different treatments tried combine application of farm yard manure (2 kg/plant) + 175:100:50 NPK kg/ha has recorded significantly maximum plant height (221.13 cm), collar diameter (22.08 mm), number of shoots,(11.93), number of infected shoots,(11.93), length of infected shoots (112.01 cm), lac yield (2273.33 kg/ha), Soil moisture content (15.47 %), available soil nitrogen (195.0 kg/ha), available soil phosphorous (54.63 kg/ha) and available soil potassium (105.3 kg/ha) compare to other treatments. The results were attributed due to the application of optimum levels of organic manure and varied nitrogen levels. The results suggested that NPK @175:100:50 kg/ha with combination of FYM @ 2 kg/plant recorded higher growth parameters, yield parameters as well as maximum lac yield. Application of (FYM 2 kg/plant) + 175:100:50 NPK kg/ha also recorded on par lac yield.
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    ThesisItemOpen Access
    PRODUCTIVITY AND REGENERATION STUDIES IN Acacia auriculiformis A. Cunn. ex Benth.
    (University of Agricultural Sciences, Dharwad, 2003) MURTHY, B. N. N.; DEVAR, K V
    Evaluation of growth, productivity and regeneration as influenced by age and site factors aimed at identifying optimum conditions of climatic, topographic and edaphic factors required to increase the growth, productivity and regeneration of Acacia auriculiformis. Four site conditions viz., Coastal Zone, Low Ghat, Up Ghat and Eastern Plain were evaluated for various growth and productivity parameters. The regeneration status of the species was also evaluated from the selected sites. The total volume was highest in Coastal Zone at 4 years (67.16m3/ha), Low Ghat at 6 years (146.75 m3/ha) and Eastern Plain both at 8 years (256.09 m3/ha) and 10 years (331.36 m3/ha). The soil properties at 4 and 6 years were found to be better under Coastal Zone and Eastern Plain at 8 and 10 years. The initial establishment of the species was superior in Coastal Zone under 4 years (1.30/4m2), 8 years (3.45/4m2) and 10 years (3.05/4m2) while the initial establishment at 6 years (1.70/4m2) was highest in Low Ghat plantations. The establishment status under Up Ghat and Eastern Plain plantations was extremely poor. The growth and productivity parameters were positive and significantly associated with climatic and edaphic factors in the initial 4 and 6 years while the growth and productivity parameters were positive and non-significantly correlated at 8 and 10 year old plantations. The regeneration of the species exhibited positive and significant association with climatic and edaphic factors.