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ThesisItem Open Access Comparative study of fertilizer recommendations based on soil and leaf analysis vis a vis blanket recommendations of rubber board(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1992) Rajendran, P V; KAU; Nazeem, P AA case study was made to assess the comparison of the dosage of fertilizer recommendation based on soil and leaf analysis vis-à-vis blanket recommendation of the rubber Board. Almost all estates in our country are practicing this method of fertilizer application and systematic data is available only from large estates.. Hence the case study was confined to Estate Sector. From the soil analytical values and economics of fertilizer usage of the nine estates studied, the following observations are made. 1. In general organic carbon status of the soil was found to be medium, though high values were also recorded in some fields. 2. The available phosphorus status of the soil was found to be low in most of the cases. 3. Except in one estate, all the estates were low in available potassium. The observation on the leaf analytical value are as follows: 1. Nitrogen status was in the medium range in most of the cases and only in few cases it is high. 2. Leaf phosphorus was found to be in medium to high range inspite of low available soil phosphorus. 3. Leaf potassium also followed same trend as leaf phosphorus. Economics of fertilizer usage based on soil and leaf analisis revealed the following: Savings in quantity as well as the cost of fertiliser could be made in seven estates. The cost of fertilizer saved per hectare was found to be Rs. 31.23. Eventhough in two estates no savings in quantity as well as in the cost of fertilizer could be made by adopting discriminatory approach, it was possible to maintain the balance among the nutrients in these estates preventing the likely drop of yield.ThesisItem Open Access Effect of spacing and planting material on the growth, yield and active principle in Plumbago rosea L.(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1990) Subha, S; KAU; Sreekandan Nair, GInvestigations on "Effect of spacing and planting material on the growth, yield and active principle in Plumbago rosea L." was conducted at the Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara during 1987-88, using factorial RBD design for exploiting this valuable medicinal plant with the following objectives: (1). To standardise the size of shoots as planting material for commercial cultivation. (2). To standardise the best spacing for better growth, yield and active principle. (3). To explore the possibility of growing Plumbago rosea L. as a commercial crop. (4). To explore the possibility of grooming this plant as an annual plant.ThesisItem Open Access Impact of rubber producers societies on rubber plantation industry in Kasargod District(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1991) Jose, M J; KAU; Nazeem, P ARubber Producers Societies were formed among small rubber growers to improve their rubber production, productivity, processing and marketing facilities. The survey was conducted to evaluate the impact of Rubber Producers Society on rubber plantation industry in Kasargod District. 110 Rubber Producers Society members in the district were contacted for this purpose using a structured interview schedule the data were collected from the respondents and analysed by simple statistical producers such as percentage, means and standard deviations. The major findings of the study could be summarised as follows.ThesisItem Open Access Evaluation of the incidence of pink disease in rubber plantations in Kanjirapally Taluk, Kerala State(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1991) Jain, P M; KAU; Sreekandan Nair, GA survey was conducted to study the intensity of the incidence of pink disease in Rubber Plantations of Kanjirapally Taluk, Kerala State. The clonal susceptibility, percentage of damage, control measures adopted by growers and recovery were also evaluated. Maximum incidence is noticed in RRII 105 and minimum in PB 235. The disease incidence is maximum in the 7th year . Bordeaux paste is the common fungicide used against this disease. But only few growers know the correct method of preparation and application of Bordeaux paste. Careless disposal of infected plant parts provide large inoculum for the spread of the disease. The growers fail to detect the disease sufficiently early to carry out effective control measures. Therefore need for an intensive extension education to create awareness in small growers about the disease and its timely control is evident from this study.ThesisItem Open Access Studies on fertility status of rubber growing soils in Kottayan Taluk(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1991) Parameshwaran Nair, K; KAU; Srikantan Nair, GTo assess the fertility status of the Rubber growing soils of Kottayam Taluk analytical data of five locations in Kottayam Taluk viz, Kooropada, Thiruvanchoor, Meenadam, Kottachira and Amayannur covering 200 small holdings including their case history were studied and the study revealed the following. All the soils tested were lateritic and acidic. Generally organic matter status was medium to high. Phosphorus and pottasium status were very low and Magnesium status medium to high. Tapioca intercropped areas showed depletion of nitrogen status. There was no depreciation of Phosphorus and Pottassium status in intercropped areas. Areas with leguminus ground covers showed better nitrogen status. Response to fertiliser was pronounced in the first four years and response was poor from 5th year onwards. All the small holdings were planted with modern high yielding clones and the trend is to follow Boards recommendation for manuring.