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2020 - 20213
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Subject: Silviculture and Agroforestry × End date: 2021 × Start date: 2020 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    On-farm evaluation of selected cereal fodders in prominent land use systems of Kerala
    (2021) Shahina, N N; Asha K Raj
    The field study entitled “On-farm evaluation of selected cereal fodders in prominent land use systems of Kerala” was carried out as two separate experiments in homegarden and coconut garden with livestock component in Madakkathara panchayath, Thrissur, Kerala during 2020-21. The study aimed to evaluate the forage yield and nutritive value of three cereal fodders viz., maize, sorghum, and bajra in major land use systems of Kerala viz., homegarden, coconut garden, and under open conditions with full sunlight. The study also assessed the relative performance of cereal fodders with hybrid napier, the popular fodder grass in Kerala. In each system, the treatments were laid out in Randomized Block Design replicated three times. The crops were cultivated during two different seasons viz., rabi and summer. In homegarden trial, all the crops established well in homegarden and contiguous open areas. In general, the growth parameters of crops were better in the open field. Among crops, maize showed better growth followed by hybrid napier, bajra, and sorghum. In open field, maize recorded significantly higher cumulative green fodder yield (93.27 Mg ha-1 in rabi and 93.32 Mg ha-1 in summer) followed by hybrid napier (70.42 Mg ha-1 in rabi and 79.20 Mg ha-1 in summer), while in homegarden, the yield of maize (57.16 Mg ha-1 and 73.50 Mg ha-1 ) and hybrid napier (60.42 Mg ha-1 in rabi and 73.51 Mg ha-1 in summer) was on par. The productivity of sorghum and bajra was poor in both land use systems. The shade tolerance of fodder grasses in homegarden is in the order; hybrid napier>maize >bajra >sorghum. Dry fodder yields also followed a similar trend. The fodder production was generally higher during the summer season than in rabi. The per day productivity was higher for bajra and maize in both land use systems. The PAR availability in homegarden as compared to open conditions during rabi and summer season was 31.72 and 49.18 percent respectively. Considering the quality aspects of fodder, the crude protein content was higher and crude fibre content was lower in homegarden than in open field, whereas xvii the dry matter and ash content showed the reverse trend. In homegarden and open field, maize had more crude protein content followed by hybrid napier, bajra, and sorghum during both seasons. The order of CF content in homegarden was in the order; maize maize > bajra > sorghum. The dry fodder yields also followed a similar trend. Per day productivity of fodder grasses was noticed more in open contiguous areas as compared to coconut garden. The maximum per day productivity was obtained by bajra and maize in both land management systems. The mean daily PAR transmittance in coconut garden during the rabi and summer season was 55.74 and 56.83 percent respectively. In the second experiment also, the crude protein content was higher and crude fibre content lower in coconut garden, whereas the dry matter and ash content observed more in open fields. In coconut garden, maize had more crude protein content followed by hybrid napier and the crude fibre content was minimum in maize. The ash content was also maximum in maize. The grasses in the coconut garden showed more N content and were recorded highest in maize. The P and K content recorded higher values in open conditions than in coconut garden. The P concentration was maximum in hybrid napier, while K content was highest in fodder bajra. In both systems, maize recorded the highest B: C ratio followed by hybrid napier. xviii Thus, the study indicates that cereal fodder, maize can be successfully and cost effectively cultivated in partially shaded tree-based systems like homegardens and coconut gardens with minimal yield loss. In comparison, yield reduction was higher under homegarden with low PAR transmission (41 percent) than that of coconut garden with higher light availability (56 percent). The study also indicated that maize outperformed hybrid napier both quantitatively and qualitatively under coconut garden with more availability of light, whereas it showed a comparable response in homegarden with intense shade indicating higher shade tolerance of hybrid napier. Bajra showed moderate performance under shady situations whereas sorghum yielded very poor results.
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    ThesisItemOpen Access
    Evaluation of biodegradable containers for seedling production in tree nurseries
    (Department of Silviculture and Agroforestry ,College of Forestry, Vellanikkara, 2020) Subhasmita, Parida; KAU; Kunhamu, T K
    A nursery trial titled ‘Evaluation of biodegradable containers for seedling production in tree nurseries’ was conducted to develop alternate eco-friendly plant container as substitute for conventional polythene bag based containers at College of Forestry, Kerala Agricultural University, Thrissur. The study involved a three month long preliminary trial to explore the efficacy of various locally available materials for use as container for tree species. Based on the preliminary trial, five better performing container types were screened for detailed nursery trial to further examine their efficiency as containers for tree seedling production. Teak (Tectona grandis) being the widely produced forest planation species in Kerala, the nursery trials were performed with teak as test crop. The locally available materials used as containers for the preliminary trial included cow dung pot, sugarcane bagasse, arecanut sheath, mud pots, bamboo splits, bamboo basket, coco pot, cloth bag, nonwoven bag, bioplastic bag and treated card board. The containers were evaluated for their durability, physical stability to management practices such as irrigation and manuring, survival percent, height and collar diameter of the teak seedlings. It was observed that the bamboo splits based containers had the highest durability and can be used for two seasons while containers made from arecanut sheath, cow dung pot, sugarcane bagasee pot, bamboo basket, bioplastic bag and cloth bag totally degraded within two months suggesting their unsuitability for tree seedling production. In general, the better container types in terms of overall seedling growth performance and physical soundness were nonwoven bag, bamboo split, coco pot, treated cardboard pot and mud pot. These five container types along with coir root trainer (CRT) supplied by Kerala Forest Department were subjected to detailed nursery trial. It was observed that considerable variability existed in seedling growth characters such as height, collar diameter, number of leaves, leaf area, number of secondary and tertiary roots, lateral root length, root length: shoot length ratio, root and shoot dry and total dry weight. Among all container types studied, nonwoven bag grown seedlings showed better growth performance followed by seedlings grown in bamboo split containers while mud pot raised seedlings showed the lowest performance during all the stages of seedling growth. The overall performance of the container types followed the order: nonwoven bag > bamboo split > coco pot > treated cardboard > Coir root trainer (CRT) > mud pot. The cost of production per seedling was Rs 8.3 for non-woven bag, Rs 60.2 for coco pot, Rs 62.0 for mud pot, Rs 11.0 for bamboo split, Rs 12.8 for treated cardboard pot and Rs 25.8 for Coir root trainer (CRT). The Benefit: Cost ratio of raising 3- month old teak seedling ranged from 0.32 – 2.45. The value was highest for seedlings raised in bamboo split pot (2.45) followed by nonwoven bag (2.41) and cardboard (1.56) while it was less than one for all the remaining container types. The trial suggest that further studies are required to develop protocols for the reinforcement of biodegradable containers for increased phys ical strength and durability.
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    ThesisItemOpen Access
    Floristic diversity and regeneration status of moist deciduous forests in Thrissur district, Kerala :reassessment after three decades
    (Department of Silviculture and Wildlife Science, College of Forestry, Vellanikkara, 2020) Abhi, Jamatia; KAU; Kunhamu, T K
    Moist deciduous forests in Kerala constitute one of the most degraded forest ecosystems consequent to demographic pressure and other bio- physical factors. Field investigation was carried out to study the changes in phytosociology and vegetation dynamics of Moist Deciduous Forests in selected locations in Thrissur Forest Division, Kerala during 2018-19. The primary objective of the study was to assess the changes in floristic diversity, structure and regeneration status of moist deciduous forests compared to a similar study carried out in the same locations prior to three decades. The selected three locations were Karadippara and Kalluchal in Peechi WL sanctuary and Kuthiran in Pattikkad range. The vegetation attributes subjected to detailed assessment included species diversity, density, relative density, basal area, relative basal area, relative frequency and Importance Value Index and size class distribution of vegetation. A total of 51 species have been reported in various study locations in the Moist Deciduous Forests of Thrissur Forest Division. Kalluchal represented the highest number of woody species (48 species) followed by Karadippara (37 species) and Kuthiran recording the lowest with 26 species. Tree density showed profound variation across sites with Kalluchal giving the highest number (691 stems ha-1) followed by Karadippara (688 stems ha-1) and lowest for Kuthiran (516 stems ha-1). Xylia xylocarpa contributed the maximum number of stems in all the three sites followed by Wrightia tinctoria and Holarrhena antidysentrica. Mean relative density was highest for upper stratum (44.62%) and 33.07% for the lower stratum and lowest for the middle stratum (22.30%). Karadippara, Kalluchal and Kuthiran sites represented 30, 45 and 20 species within frequency class I (within 1-20%) and there was conspicuous absence of species in the higher frequency class in all the three sites. All the three sites had similar total IVI around 300. The major share of the IVI was confined to the species in the upper stratum (58 to 60%) while the middle and lower stratum has a lower and similar trend in IVI distribution (20% each). Size class distribution of among various social l classes ii showed conspicuous absence of majority of tree species in the higher size class suggesting a skewed distribution pattern. Almost 85% of individuals in each species belonged to lower size classes (h50 and h100) which drastically declined with increase in size class. A comparison with the study in the same sites three decades back indicates variable results. There was overall improvement in species diversity and phyto-sociological attributes in the Kalluchal region particularly, the species density and regeneration patterns. However, the number of individuals in the present study at Karadippara and Kuthiran sites, especially in the lower size classes were far lower compared to the previous study implying that the regeneration patterns of many tree species have been seriously affected by the undesirable changes in the past three decades. Probably, apart from human influences, the impact of changing climate may also have affected the regeneration ecology and vegetation dynamics of the MDF forests in Thrissur District which necessitate further detailed investigation in this line.