Thesis

Browse

Search Results

Now showing 1 - 9 of 171

Open Access
Studies Nutrient Management of Urd bean under Late Sown Condition
(Birsa Agricultural University, Ranchi, 2002) Bhushan Prasad Singh; A. Rafey
Studies on nutrient management of Urdbean (vigna mungo L. Hepper) under late sown condition was conducted during rainy (Kharif) season of 2000 in ultipaleustalf red loam soil (Belonging to the Red- Yellow - Light grey catenary soil association group representing major soil group of plateau region) of Birsa Agricultural University farm, Kanke, Ranchi. The soil reaction was slightly acidic (pH 6.8). The experiment was laid out in factorial randomized block design with three replications. Twelve treatments in combination with four nitrogen levels management (20 kg N/ha as basal, 20 kg N/ha as basal + 10 kg N/ha as foliar, 30 kg N/ha as basal+ 10 kg N/ha as foliar and 30 kg N/ha as basal) and three population densities (5 lakh plants/ha, 4 lakh plants/ha and 3.33 lakh plants/ha maintained at spacing 20x10, 25x10 and 30x10 cm, respectively) were studied for the production of Urdbean. The recommended doze of 40 kg P₂Os and 20 kg K₂0/ha was applied as basal in furrow at the time of sowing in the form of single super phosphate and muriate of potash, respectively. On the basis of one year of experimentation it was revealed that the urdbean crop sown under late sown condition was influenced by nitrogen levels and population densities. Higher grain yield (11.8 q/ha), straw yield (47.6 q/ha), harvest index (19.91 %), net return (9761.5 Rs/ha) and benefit cost ratio (1.96) was obtained when 30 kg N/ha was applied as basal and sowing was done at 25x10 cm spacing (4 lakh plants/ha) and found to be significantly superior among all the nitrogen levels and population densities. Urdbean roots and nodules were also significantly influenced by nitrogen levels and population densities. Higher lateral (8.7 cm) and vertical (19.0 cm) expansion of roots, dry weight of roots (0.50 g), number of nodules (47.0), effective nodules (42.0), per cent effective nodules (89.3) and dry weight of nodules (0.29 g) per plant was recorded when 30 kg N/ha was applied as basal and sowing was done on 25x10 cm spacing (4 lakh plants/ha). But the Nitrogen concentration in nodules was higher when 30 kg N/ha was applied as basal + 10 kg N/ha as foliar and sowing was done on 25 x 10 cm spacing. Nitrogen, phosphorus and potassium concentration in grain and straw of urdbean was higher when 30 kg N/ha as basal + 10 kg N/ha as foliar was applied and crop was sown on 25 x 10 cm spacing (4 lakh plants/ha). Nitrogen, phosphorus and potassium uptake in grain and straw of urdbean crop and its total uptake was higher when nutrient was applied @ 30 kg N/ha as basal and crop was sown at spacing 25 x 10 cm (4 lakh plants/ha) and found to be significantly superior among all the nitrogen levels and population densities. Value of available nitrogen, phosphorus and exchangeable potassium of soil after urdbean harvest was higher when nutrient was applied @ 30 kg N/ha as basal + 10 kg N/ha as foliar at 25 x 10 cm (4 lakh plants/ha) spacing. Net change in soil fertility after harvest of Urdbean crop was also significantly influenced by nutrient management and population densities. Higher value of nitrogen, phosphorus and potassium was recorded when crop was sown at 25 x 10 cm spacing (4 lakh plants/ha) with the nutrient application of 30 kg N/ha as basal + 10 kg N/ha as foliar.
Open Access
Integrated Nutrient Management In Maize-Wheat Cropping System
(Birsa Agricultural University, Ranchi, 2001) Sushil Kumar Pathak; S.N.Singh
On going long term manurial trial started since 1983 at Birsa Agricultural University Farm, Kanke, Ranchi was selected for this experiment during two consecutive years of 1997-98 and 1998-99 to find out the effect of integrated nutrient management in maize-wheat cropping system, the most extensively adopted in the uplands of Chotanagpur plateau region. The soil of the experimental plot was Ultic-paleustalf, Red loam soil belonging to the Red-Yellow-Light-Grey Catenary Soil Association Group, representing major soil group of this region. The experiment was laid out in randomised block design with three replications. The treatments comprised of three organic sources viz. FYM, paddy straw and green karanj leaves (Pomganea pinnata) substituting 25 per cent and 50 per cent of the optimum doses of NPK during kharif season thus making six treatments, which were evaluated against four varying levels of inorganic fertilizers along with one each of unfertilized control and farmer's practice (only 50 kg Urea ha). The recommended dose of NPK for both maize and wheat were 100:50:25 kg N:PO, KO ha. At the inception of the experiment during 1983, the soil was well drained, loam in texture having Bulk density (1.39 g cm), Mean weight diameter of soil aggregates (0.718 mm), pH (6.5), water holding capacity at 33 KPa (19.6%) and 1500 K Pa (11.3%), organic carbon (0.410 %), available N (255.0 kg ha ¹), available P (14.19 kg ha-¹) and available K (190.7 kg ha). After 14 years of experimentation it was found that FYM either substituting 50 per cent (T) or 25 per cent (T,) of recommended NPK dose of inorganic fertilizers in maize and getting 100 percent or 75 per cent NPK in wheat, respectively scored over all other treatments as regards yield, economics, energy efficiency and maintenance of soil health. These two treatments, T, and T, produced wheat equivalent yields of 71.37 and 68.94 q ha fetching net returns of Rs. 28,918-67 and Rs. 28,694-33 per hectare with a benefit:cost ratio of 1.37 and 1.45, respectively. As against this only Rs. 21,803-33 ha was realized from T₂, the treatment getting 100 per cent NPK to both maize and wheat through inorganic fertilizers. The mean maximum uptake of N, P and K was also higher in these two treatments receiving FYM in kharif. The quantities of NPK removed by the system were 207.85, 29.43, 210.41 kg ha' in the treatment substituting 50 per cent N (T) and 204.52, 27.98 and 201.62 kg ha in the treatment substituting FYM in lower proportion i.e. 25 per cent (T) Energy production as well as energy-use-efficiency by the system in these two FYM treated plots exhibited higher values as compared to other treatments but were statistically comparable to each other. The values of maximum energy output (1,14,197 and 2,84,089 MJ ha¹ by grain and total biomass, respectively) was recorded in T. (substitution of FYM in higher proportion while T, (lower substitution of FYM) recorded highest energy-use-efficiency (3.772 and 9.460 by grain and total biomass) and lowest value of specific energy (427.57 MJ ton"). The other organic sources (paddy straw and green karanj leaves) were not as effective as FYM, but, they had definite favourable impact on soil properties. Paddy straw induced development of the highest organic carbon content in soil and the karanj leaves were as effective as FYM in available N content in soil. Yield under these organic sources were comparable in case of maize and superior in case wheat at their higher substitution to T,, the treatment getting 100 per cent NPK in both crops through inorganic fertilizers. Soil fertility analysis viewed that there was considerable improvement in physical condition of soil by reducing bulk density and enhancing mean weight diameter of water stable aggregates as well as water holding capacity at both 33 K Pa (Field capacity) and 1500 K Pa (Permanent wilting point) besides maintaining soil pH by the organo-inorganic combinations (T, to T). Considerable build-up in organic carbon percentage as well as in available N, P and K was also noticed through integration of organic sources with inorganic fertilizers (T, to T.).
Open Access
Effect of Nitrogen Levels on Mustard + Chickpea Intercroppings System
(Birsa Agricultural University, Ranchi, 2001) Mahesh Chandra Jerai; J.Toppo
The research work on intercropping has mostly focused on the suitable spatial arrangement and nutrient levels on mustard + chickpea intercropping system. Merge attention has been paid to nitrogen level in isolation which is also an important aspect of intercropping system as the component crops arc are different in nature of growth and nitrogen needs. Therefore this study was carried out on the effect of nitrogen levels on mustard + chickpea intercropping system during the rabi (winter) season of 1998-99 on a rainfed upland sandy loam soil of Birsa Agricultural University Farm, Ranchi. The experiment was laid in Split Plot Design in intercropping of mustard + chickpea with two ratio (1:1 and 2:1 row ratio) which constituted main plot and three levels of nitrogen (control (no fertilizer), 20 kg nitrogen and 40 kg nitrogen per hectare). A uniform dose of phosphoric @ 40 kg POs ha in the form of SSP and K,O 20 kg ha¹ as muriate of potash was applied at the time of sowing. In addition to intercropping two sole crops of mustard and chickpea were allocated randomly in each replication for comparison. Salient features of the results of the experiment are given below. The assessment of the row ratio and yield advantages revealed that through the yield attributes, yield per se of component crops in intercropping system were reduced as compared to those of the sole crops, the combined equivalent yield of component crop in intercropping system exceeded the higher sole crop yield. The periodic plant height of mustard was not influenced by intercropping system, the maximum height (127 cm) of mustard was recorded at harvest, while the levels of nitrogen greatly influenced the height of mustard plants. The maximum height of mustard was obtained with the application of 40, kg per hectare N which was significantly more than that obtained with other treatments. Similar results were also obtained at 60 and 75 days after sowing. Yield components (primary and secondary branches, seeds/siliquae pod, siliquae or pod per plant and 1000-seed weight) were influenced by intercropping and level of nitrogen. The yield of the component corps, in intercropping systems, reduced as compared to those of the sole crops. The combined equivalent yield of component crop in intercropping system exceeded the sole crop yield. The intercropping system (mustard + chickpea 1:1) was the best from yield (equivalent yield 1776 kg/ha), Economic return (Rs.22,095/ha) and bio-energetic (Energy use efficiency by grain 3.02) point of view. Application of 40 kg nitrogen per hectare gave maximum equivalent yield (1850 kg/ha), economic return (Rs.23,173/ha) and bio-energetic (Energy use efficiency by grain 2.79). Although sole chickpea produced the highest net return (Rs.33,180/ha) and benefit: cost ratio (5.99). Sole chickpea left more available nitrogen in soil as compared to that recorded in intercropping system, which was followed by the intercropping of mustard + chickpea (1:1 row ratio). Under different nitrogen levels, application of 40 kg nitrogen left more available nitrogen than any other treatments. There was no effect on availability of phosphorus, potassium and organic carbon. Moreover, the availability of potassium and phosphorus was maximum in control plots. The experimental results and economic analysis of the experiment indicated that sale crop of chickpea in upland rainfed situation of plateau region of Jharkhand showed best performance. Among the intercropping systems, mustard + chickpea (2:1 row ratio) can profitably be replaced by mustard + chickpea (1:1 row ratio) intercropping system. The application of 40 kg nitrogen gave the maximum net return which was at par with the application of 20 kg nitrogen per hectare.
Open Access
Production Potential of Finger Millet Cultivars under Different Nitrogen Levels In Rainfed Condition
(Birsa Agricultural University, Ranchi, 2001) Md.Naiyar Ali; S.Ahmed
A field experiment was carried out to study the production potential of finger millet cultivars under different nitrogen levels in rainfed condition" during kharif 2000 at Birsa Agricultural University Farm, Ranchi. The experiment was laid out in Randomized Block Design with three replications. Treatment consisted of six finger millet cultivars (A404, PR202, HR374, BM2, JBT2 and BAU2) with three nitrogen levels (20, 40 and 60 kg N ha¹). The experimental soil was representative sandy loam in texture and acidic in reaction with low in organic carbon, available nitrogen, medium in available phosphorus and potassium. Among finger millet cultivars A404 and PR202 (long) duration) performed better growth, higher number of tillers plant and metre row length, higher gain weight ear and test weight, maximum mean grain yield (17.03 q ha¹) and net return (Rs.4428.2 ha¹) with higher benefit cost ratio (0.84) in comparison to cultivar HR374 and BM2 (medium) and JBT2 and BAU2 (short duration). Grain yield of long duration cultivars was increased by 9.4 and 17.7% as compared to medium and short duration, respectively. Application of 60 kg N ha ha' produced taller plant, higher yield attributes (tillers plant', grains ear¹ and test weight) maximum grain yield (18.90, q ha¹) and net return (Rs.4720, ha¹) with higher benefit: cost ratio (0.83) which was closer to 40 kg N ha".
Open Access
Integrated Nutrient Management In Forage- Food Crop Sequences
(Birsa Agricultural University, Ranchi, 2001) Arvind Kumar; N. K. Prasad
The experiment was conducted at fodder farm, B.A.U., Ranchi to study the effect of integrated nutrient management in forage food crop sequences. It was carried out since 1989-1990 and the detail observation of the last 3year (1997-98 to 1999-2000) were recorded and interpreted. The Treatments comprised of two sequences Viz. rice –berseem and rice –oats in main- plot and 4 integrated nutrients Management ha-1 viz. 100% recommended level of NPK in both season,75% recommended level of NPK + 10 t FYM in Kharif, 75% recommended level of NPK + 10t FYM in Rabi and 75% recommended level of NPK + 10 t FYM in both season (Kharif + Rabi) in Sub –Plots and replicated thrice. The gross plot size of 4.0m X 2.5 m was Kept. Line sowing of each crop was done at 25cm apart. The soil of the experimental plots was silt loam in texture (sand 38.25, silt50.95, clay 10.83%. It was low in organic carbon (0.52),available N (216Kgha-1 ) P (12.2 Kg ha-1 ) and medium in K (141.6 Kg ha-1 with Ph 5.9. The results of last three years of investigation revealed that the rice as a succeeding crop to berseem produced higher rice yield when both the crops were fed with 75 % recommended level of NPK plus 10 t FYM ha-1. Application of 75% recommended level of NPK + 10 t FYM ha-1c in both the season also recorded the maximum forage yield in oats which was followed by oats forage yield received at 100% recommended level of NPK. Alike to oats forage, berseem has also produced the maximum quantity of forage yield under the same treatment. Berseem has significantly recorded a better enrichment in available Soil N during all the years as well as integrated application nutrient has also accounted for higher enhancement in soil N. However, the maximum available soil P was recorded when the sequences were taken at 100% NPK applied through chemical fertilizers. Maximum available soil K was also recorded after the harvest of Kharif as well as Rabi, component grown entirely on chemical sources of nutrients. Rice harvested after berssem removed higher quantity of NPK as compared to rice harvested after oats. Among forage components, gave higher NPK yield as compared to oats. However, rice sequence as a whole removed the maximum quantity of NPK. The balance sheet of nutrients further indicated maximum recovery of these three nutrient under cereal- cereal sequence as compared to cereal – legume. A definite enhancement in N and P status of soil to its initial level was noticed but the trend was reversed in case of K build up which suggested some additional application of K in these crops. Rice –oats sequence has utilized the NPK in a better way than rice berseem sequence. While sequence having forage legume has evaluated for higher N uptake efficiency as compared to sequence having forage cereal. A better utilization of N was accounted under the system having cereal grain and forage components. P uptake efficiency was neither influenced by the cropping sequences nor fertility treatments. Rice- oat sequence has shown better utilization of P than rice –berseem. Rice –oat sequence has computed for higher K uptake efficiency than rice berseem whereas different in utilization efficiency was not recorded under either of the sequence or fertility management. Both the sequence were found equally remunerative but the crop grown in presence of 75% NPK + 10t FYM ha-1 in both the season has given significantly the maximum net return (Rs31,659 ha-1 yr-1). Though rice –oat sequence consistently and significantly accounted for higher overall net return to rupee investment but rice –berseem sequence was more remunerative due to higher over all net return (Rs 33,415ha-1yr-1) and the same has also enriched the soil in a better way as compared to cereal –cereal sequence. The maximum energy output recorded under rice –oats sequence as compared to rice berseem sequence. Fretility build up under rice –berseem as well as rice –oats sequence fertility with 75% recommended dose of NPK + 10 t FYM in both the season appeared to be more stable. The same was also true in case of net return during the different years of investigation.
Open Access
Weed Management in Wheat Based Intercropping System
(Birsa Agricultural University, Ranchi, 2000) Nargis Kumari; K. Prasad
Among the factors responsible for drastic reduction in grain yield, weed occupies top most position. Weed is a serious problem in general and during rabi season particular. The problem have intensified due to increase in irrigation facilities, fertilizer use and adoption of high yielding cultivars and changed agrotechniques. Recently, there has been a rapid growing interest in adopting intercropping system as a most potential tool for enhancing the crop production over space and time. The yield advantages through intercropping over sole cropping are achieved not by means of costly inputs but by simple expedient of growing crops together. Weed management research in India has been mostly confined to sole cropping and the information pertaining to weed control in intercropping is rather meagre, specially in winter crops. Wheat crop often suffers from severe weed competition. Keeping the above fact in mind, a field experiment was conducted in split plot design with three replications. Five cropping systems (viz. sole wheat (20 cm), sole linseed (25 cm), sole sunflower (60 cm), wheat+ sunflower (3:1) and wheat + linseed (3:1) were kept in main plot and five weed management practices were kept in sub-plots [Weedy control, Weeding (20, 40 and 60 DAS). Pendimethalin (1.5 kg a.i. ha" pre-emergence), Isoproturon (1.5 kg a.i. ha post emergence) and Pendimethalin + isoproturon (1.0 kg a.i. ha pre-emergence + 1.0 kg a.i. har¹ post-emergence). The results revealed that intercropping of wheat either with sunflower or linseed in 3:1 rows ratio proved superior to their sole cropping in respect of yield attributes, yield and economic advantages. Intercropping of wheat with sunflower in 3:1 rows ratio produced significantly higher wheat equivalent yield (8605.67, 9272.76 and 8939.15 kg ha) in respective years and on pooled basis. Wheat + sunflower (3:1) intercropping system recorded lesser competitive ratio (0.58 and 0.53) and higher value of relative crowding coefficient (10.21 and 15.29) in respective years. Negative value of aggressivity (-0.41 and -0.44) were obtained in wheat + sunflower (3:1) intercropping system, which indicates that the wheat was dominated by the sunflower in the system. Wheat + sunflower intercropping system in 3:1 rows ratio recorded maximum nitrogen uptake (92.70 and 102.70 kg ha), net return (Rs.41722.52 and 48214.15 ha) and benefit: cost ratio (4.87 and 5.47) in respective years than sole cropping of either of the crops. The effect of manual weeding at 20, 40 and 60 days after sowing was comparable with combined use of pendimethalin as pre-emergence + isoproturon as post-emergence each @ 1.0 kg a.l. ha in reducing weed density and weed dry matter. Weeding thrice (20, 40 and 60 DAS) produced maximum wheat equivalent yield (6017.18, 6701.15 and 6359.17 kg ha-¹) in respective years and on pooled basis, which was comparable with combined use of herbicides. Pre emergence application of pendimethalin @ 1.5 kg a.i. ha recorded minimum competitive ratio (0.42) in 1997-98, whereas in 1999-2000 minimum competitive ratio was recorded under weeding (20, 40 and 60 DAS). Combined application of pendimethalin, pre-emergence + isoproturon, post-emergence each @ 1.0 kg a.i. ha¹ in wheat intercropped either with sunflower or linseed gave minimum value of aggresivity (-0.40 and -0.41) in respective years, whereas maximum value of relative crowding coefficient was recorded under combined application of pendimethalin as pre-emergence+ isoproturon as post-emergence each @ 1.0 kg a.i. ha¹¹ in 1997-98 and under weeded plots in 1999-2000. Weeding at 20. 40 and 60 days after sowing recorded maximum nitrogen uptake by crops (82.47 and 89.23 kg ha) in respective years which was comparable with post-emergence application of isoproturon @ 1.5 kg a.i. ha¹ and combined use of herbicides. Manual weeding (thrice) at 20, 40 and 60 days after sowing recorded highest gross return in both the years while combined use of pendimethalin as pre emergence + isoproturon as post-emergence each @ 1.0 kg a.i. ha recorded highest net return (25783.14 and 30638.23 Rs ha') and benefit: cost ratio (3.42 and 3.87) in respective years.
Open Access
Phosphorus Management in Rice - Wheat Cropping System
(Birsa Agricultural University, Ranchi, 2000) Sanjay Kumar; R.S. Singh
Rice-wheat is the most important and widely adopted cropping system in India. It contributes about 75 per cent to the national food basket. There is urgent need to increase the productivity of this system (4.62 to 5.57 t ha) to feed the anticipated 1004 million people by 2000 AD. Phosphorus is one of the most limiting nutrient governing the yield of rice and wheat. P-fixation capacity of lateritic soil is high and these soils show deficiency in available phosphorus even under waterlogged condition. Keeping this view, a field experiment was conducted during kharif and rabi seasons of 1997-98 and 1998-99 at BAU Farm, Kanke, Ranchi to study the effect of phosphorus management in rice-wheat cropping system. The soil was sandy loam in texture, acidic in reaction (pH 6.1) low in available nitrogen (235.5 kg N ha), phosphorus (9.93 kg P ha¹) and organic carbon (0.48%) and medium in available potassium (122 kg Kha¹). Treatment consisted of 3 levels of phosphorus (13.1.26.2 and 39.3 kg ha')in main plot and 6 levels of phosphorus frequency (T, P-application to both year kharif and rabi, T, P - application to both year kharif, T,: P-application to both year rabi, T.: P-application to first year kharif only. T, P application to first year rabi only and TP-application to first year kharif and rabi only) in sub-plot. The experiment was laid out in split-plot design with four replications. Result revealed that application of 39.3 kg P ha¹ recorded maximum plant height, number of effective tillers m². grains per panicle / spike, test-weight, grain and straw yields and it was statistically at par with 26.2 kg P ha. Rice grain equivalent yield responded upto 26.2 kg Pha (68.91 q/ha). Maximum net return (Rs. 10320 ha) and benefit: cost ratio (0.91) were recorded with application of 39.3 kg P hat and it was at par with due to 26.2 kg P ha (Rs. 9614 ha and 0.87). Among frequencies, direct and cumulative phases of P-application were significantly better than its residual phases with respect to yield attributing characters and yield of rice and wheat in both seasons. Analysis of pooled data revealed that maximum rice equivalent yield (79.65 q ha''), net return (Rs. 12122 ha) and benefit: cost ratio (1.06) were recorded when P was applied in all the seasons and it was at par with treatment receiving phosphorus only in rabi (70.79 q/ha': Rs. 10093 ha and 0.92) and treatment receiving phosphorus in first year kharif and rabi (70.80 q ha", Rs. 10177 ha¹ and 0.93). Both rice and wheat crops removed higher amount of N.P and K under 39.3 kg P ha level than its preceding levels. Direct and cumulative phases of P-application were significantly better than its residual phases with respect to N.P and K uptake. There was considerable buildup of P-status in soil with increasing levels of phosphorus and application of phosphorus in all the seasons after completion of the experiment. Energy out put and energy use efficiency (Both economical and biological) were maximum when 39.3 kg P ha-1 was applied to the crops, whereas among frequencies treatment receiving phosphorus in all the seasons were significantly superior to rest of the treatments.
Open Access
Contribution of Production Factors to Niger (Guizotia Abyssinica Cass.) Production
(Birsa Agricultural University, Ranchi, 2000) Shambhu Sharan kumar; A .Rehman
A field experiment was conducted on the crop niger during late Kharif season of 1999-2000 at Birsa Agricultural University Farm, Kanke, Ranchi to study the contribution of production factors to niger (Guizotia abyssinica Cass.) production. The soil was sandy loam with slightly acidic (pH 6.1) in reaction. The experiment was laid out in randomized block design with eight treatments (T₁ = local practice, T₂ = full package, T, T₂- fertilizer, T₁ = T₂ -line sowing; To T₂- Improved variety, T= T₂ weed control; Ty = T₂- (line sowing + weed control); To T₂- (fertilizer + variety) were replicated three times. The results of the experiment revealed that growth attributes (plant height, number of primary and secondary branches per plant) and yield attributes (number of capitulla per plant and seeds per capitulla) were significantly higher over local practices due to adoption of full package of practices Among all the treatments, full package recorded maximum biological, seed and straw yields (26.51, 6.10 and 20.41 q/ha,respectively). In economics, the treatment full package computed maximum gross return, net return and benefit-cost ratio (Rs.5492.3/ha, Rs.1066.3/ha and 0.24 respectively) and the local practice recorded minimum gross return, negative net return and negative benefit-cost ratio (Rs 2317 6, Rs 559 per hectare and 0.19, respectively). The application of fertilizers, weed control, improved variety and line sowing contributed in increasing the yield of niger by 48.7 %, 34.0 %, 14.4 % and 1.8 %, respectively, over local practice (no use of fertilizers, broadcast seeding, local variety and no weeding). The combined effect of full package in contributing the increase in yield of niger was 129.3 per cent. Hence, on the basis of above findings full package might be established as the best treatment in maximizing net profit as well as benefit-cost ratio in niger crop for those farmers who are ready for investment in the production of niger.
Open Access
Effect of Temperature And Moisture on Growth, Development And Yield of Wheat
(Birsa Agricultural University, Ranchi, 2000) Agronomy

Thesis

Browse

Thesis Type

Type

Author

Date

Subject

Search Results