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ThesisItem Open Access Studies on the performance of two groundnut varieties, TMV-2 and TMV-9, under graded doses of phosphorus and potassium.(Department of Agronomy, College of Agriculture, Vellayani, 1978) Purushothaman Nair, N; KAU; Sadanandan, NThesisItem Open Access Study on adoption of soil conservation measures by farmers in scheme areas of Trivandrum District(Department of Agricultural Extension, College Of Agriculture, Vellayani, 1978) Balakrishna Pillai, G; KAU; Nair, G TThe magnitude of the problem of soil erosion is so high in Kerala mainly due to the undulating topography and high intensity of rainfall. More than 10 lakhs hectares of undulating land have to be protected from the hazards of erosion by effective soil conservation measures . The results of studies conducted on the soil loss by the soil conservation station. Konni has shown that the soil loss where slope was 30 per cent was 241.56 tonnes per acre per year. Attempts are made to control the serious loss of top soil by the Department of Agriculture (Soil Coservation Unit) by implementing integrated soil conservation schemes. But the progress of coverage was poor. Even in scheme areas, many farmers are non -adopters of the required soil conservation works. Many farmers have not taken up the required Agronomy and Agrostology works eventhough theycompleted the contour bunding works. A detailed study was essential to understand all those aspects of adoption . This study was an effort in that direction.ThesisItem Open Access Study on the role of leadership in agricultural development in rural areas in Kerala(Department of Agricultural Extension, College of Agriculture Vellayani, Trivandrum, 1979) Muthiah Manoharan, P; KAU; Thiagarajan Nair, GThis study on the role of leadership in agricultural development was designed to measure the role perception and 1 f role performance of different categories of leaders, as well as the factors associated with the role performance of leaders. This study was conducted in Arayoor I.P.D. Unit in Trivandrum District. This study covered five categories of leaders viz., Agricultural, Political, Co-operative, Ela committee and Panchayat leaders. The important findings were the following: 1. There was no significant difference among all categories of leaders regarding their age, educational level, communication skill, attitude towards agriculture and knowledge of the programme and improved agricultural practices. . 2. Agricultural and Ela committee leaders had higher farm size, higher income and had adopted more practices when compared to other categories of leaders. . 3* Agricultural, Panchayat and Co-operative leaders had high value orientation, high achievement motivation and had more favourable attitude towards high yielding varieties than other categories of leaders. 4. Co-operative leaders had more favourable attitude than other categories of leaders towards fertilizers* Panchayat, Agricultural and Political leaders had more favourable attitude than other categories of leaders towards plant protection. 5. Ela committee leaders had more mass media exposure than other categories of leaders. Ela committee, Agricultural and Panchayat leaders had more frequent contact with extension agency than other categories of leaders. ■ 6. The results revealed that Panchayat and Agricultural leaders had more perception of agricultural development roles than other categories of leaders. Agricultural leaders performed more roles in agricultural development than other categories of leaders. 7. When the pooled ranks were worked out the role "Accept improved agricultural practices before others" emerged as the most important role perceived as well as performed by the leaders. 8. Mass media exposure was significantly correlated with the role performance except in Political leaders. Caste also had influence in role performance. 9. Six variables viz., farm size, income, knowledge, mass media exposure, contact with extension agency and adoption behaviour were correlated, with role performance . significantly when the pooled data were considered. 10. Inter-correlation analysis lead to the conclusion that farm size had significant correlation with income, knowledge, mass media exposure, contact with extension agency and adoption behaviour. Income was significantly correlated with knowledge, mass media exposure, contact with extension agency and adoption behaviour. Knowledge was significantly correlated with contact with extension agency and adoption behaviour. There was also a significant correlation between mass media exposure and contact with extension agency. 11, It was also observed that the proportion of role performance explained by the variables viz., farm size, income, knowledge, mass media exposure, contact with extension agency and adoption behaviour was 50 percent.ThesisItem Open Access Studies on the regulation of progeny production and sex-ratio of Wesmael(Department of Agricultural Entomology, College of Horticulture,Vellanikkara, 1979) Susamma, Jacob; KAU; Abraham, C CThe fecundity, progeny production, female – male composition of the progeny and duration of development of Bracon brevicornis wesmael as influenced by the density and size (weight) of host larvae of Corcvra cephalonica Stainton and the sex-ratio of the parent parasite population were studied at three temperature- humidity (TH) combinations, viz, 280c and 75% RH (TH1), 300c and 60% RH (TH2) and 320c and 50% RH (TH3). The maximum fecundity of the parasite was registered consistently at all the three TH levels at a host density level of two larvae per female parasite. The exclusive use of light weight larvae (weight range 8 to 10 mg) as hosts produced significantly less number of eggs at the TH1 and TH2 levels, while at the TH3 level the fecundity was maximum when the heavier host larvae (weight range 30 to 35 mg) were used. The parental sex-ratio levels of 2:1 and 3:1 (female:male ) led to the production of higher number of eggs than under the ratios of 1:1, 1:2 and 1:3. The maximum progeny production in B. brevicornis at the TH1 and TH2 levels was attained under a host density level of two larvae per female parasite. The progeny production was relatively higher at the TH1 and TH2 levels when heavier larvae were exposed for parasitisation. The superiority of the parental sex-ratio of 2:1 (female: male) in the production of higher number of progeny was established at the TH2 and TH3 conditions. Significant influence of the host larval density on the female progeny production was detected at the TH1 and TH2 levels. The female progeny production was maximum at a host larval density level of two per female parasite at the TH2 combination, while this was found to be the highest at a density level of one larva per female parasite at the TH1 level. Relatively heavier host larvae produced significantly higher number of female offsprings at the TH2 and TH3 combinations. The parental sex-ratio level of 2:1 (female:male) consistently produced maximum number of female progeny. The influence of host larval density on the proportion of females was pronounced only at the TH3 level and a density level of two laevae per female parasite was found to be better with reference to the production of a higher proportion of females. The sex-ratio of the parent parasite population influenced the proportion of females in the F progeny and a ratio of 1:3 (female:male) produced higher proportion of females at the TH2 and TH3 combinations. The host larval density, weight of host larvae and the sex –ratio of the parent parasite population exerted significant influence on the duration of development of B. bravicornis. The feasibility of manipulating the ambient temperature-humidity conditions for maintaining laboratory cultures of B. brevicornis at the maximum possible levels has been discussedThesisItem Open Access Morphological studies and quality evaluation of ginger (zingiber officinale rosco) types(Department of Horticulture (Plantation Crops), College of Horticulture, Vellanikkara, 1978) Nybe, E V; KAU; Sivaraman Nair, P CA detailed study of 25 ginger types was conducted during the period from April 1977 to June 1978 at the College of Horticulture, Vellanikkara with a view to find out the feasibility of fixing up specific morphological characters to identify different types, to screen out ginger types with high yield, high quality and resistant or tolerant to pests and diseases and to study the quality variations at different periods of maturity. The study revealed that morphological characters are not reliable to classify the ginger types, although some of them can be identified by rhizome characters. The morphological characters such as length of leaf, leaf area index and number, length and girth of primary and secondary fingers were found to be positively correlated with yield. All the types studied are susceptible to the incidence of soft-rot, leaf –spot and shoot-borer. The type Maran was relatively tolerant to soft-rot whereas Rio-de-Janeiro was found to be the most susceptible type. Yield was found to vary significantly among the types studied. Maximum yield was recorded in Nadia followed by Bajpai, Maran and Narasapattom. Maximum oleoresin percentage was in Rio-de-Janeiro and highest percentage of oil recovery in Karakal. But the maximum yield per hectare of oleoresin and oil was in the type Maran. Fibre content was minimum in China and maximum in Kuruppampady closely followed by Maran. The yield, dryage and percentage of oleoresin, oil and crude fibre varied significantly among the different maturity periods studied. The percentage of oleoresin, oil and fibre was maximum at 165 days after planting. But the maximum yield per hectare of oleoresin and oil were found at 270, 195, 225 and 225 days after planting in Rio-de-Janeiro, Maran, Kuruppampady and Wynad Local respectively. Cultivation of the types Nadia, Bajpai and Maran is recommended for higher total yield of dry ginger for the plains of Kerala. Considering the low incidence of soft – rot and higher yield of oleoresin and ginger oil the type Maran is preferredThesisItem Open Access Effect of phospherus nutrition liming and rhizobial inculation on soybean(Department of Agronomy, College of Horticulture, Vellanikkara, 1979) Kurian, T M; KAU; Vikraman, RAn experiment was conducted at the Instructional Farm attached to the College of Horticulture, Vellanikkara during July to October 1978, to study the effect of phosphorus nutrition, liming and rhizobial inoculation on soybean (Glycine max (L.) Merril). The investigation was taken up with the objective of arriving at the phosphorus requirement of the crop, assessing the response to liming and evaluating the effect of rhizobial inoculation. The trial was also aimed at studying the possible interaction effects between these factors. The experiment was laid out as a factorial in randomized block design with 16 treatments and 3 replications. The study revealed that applied phosphorus did not significantly affect any of the growth characters consistently. Grain yield and yield attributes were also unaffected but stover yield increased with higher doses of applied phosphorus. In general, nitrogen, phosphorus and calcium contents in plant components were unaffected by levels of phosphorus, liming and rhizobial inoculation. Uptake of these nutrients also remained almost unchanged. At harvest, nitrogen uptake by seeds constituted 44 per cent of the total, remaining being accumulated in stem + petiole and shell. In the case of phosphorus, 86.9 per cent of the total accumulation was in seeds, 6.0 percent and 7.1 per cent being in stem + petiole and shell respectively. Calcium being an immobile nutrient and an element not translocated within the plant, proportion of uptake of calcium in various components of the plant was different from that of nitrogen and phosphorus. In contrast to nitrogen and phosphorus, only 24.9 per cent of the total was found in seeds whereas 36.3 per cent and 38.8 per cent of it were concentrated in stem + petiole and shell respectively. Levels of phosphorus, had no effect on total nitrogen and available potassium contents of soil after harvest of the crop but there was a notable increase in available phosphorus and decrease in exchangeable calcium. Liming and rhizobial inoculation did not have any conspicuous effect on the content of nutrients in soil.ThesisItem Open Access Effect of different growth regulators on flowering and fruit development in pineapple(Department of Horticulture (Pomology), College of Horticulture, Vellanikkara, 1979) Santha, K K; KAU; Aravindakshan, MThe present investigations were carried out in College of Horticulture, Kerala Agricultural University during the years 1976-78. The object of the study was to find out the effect of growth regulators and certain other chemicals on flowering and fruit development in pineapple. The growth regulators and chemicals included in this study consisted of ethrel and Planofix at different concentrations and combination of Ethrel, Ca CO3 and urea. Ca C2 was also included in this study. Seasonal variation in the effect of growth regulators and chemicals in two seasons was noticed. Application of growth regulators and chemicals in January resulted in earlier flowering than November application. The differential response of growth regulators in the two seasons might be attributed to the variation in leaf area. Of the different growth regulators and chemicals tried, Ethrel 250 ppm was found to be the for maximum induction of flowering. Ethrel at all concentrations was found to reduce the duration of flowering and also the time for fruit set. Ethrel in combination with urea 2 per cent and Ca CO3 0.04 per cent also showed similar effect. Time taken for fruit maturity was slightly reduced by Ethrel treatment while it was delayed by the application of Planofix. In respect of fruit size, maximum size was obtained by Planofix 20 ppm. None of the growth regulators, chemicals and combinations tried resulted in an over all improvement in quality of fruits, but the number of leaves possessed by a plant profoundly influenced the quality of fruits. While induction of flowering could be achieved by the application of growth regulators and chemicals irrespective of the morphological characters of the plant, the fruit development was found to be associated with the number of leaves possessed by the plant. The fruits produced by plants with higher number of leaves (Class IV) possessed maximum of TSS, reducing sugars, total sugars and sugar acid ratio closely followed by Class III. For a satisfactory fruit development the plant should possess around 40 leaves at the time of application of growth regulators. The nutrient status of leaves was also found to influence fruit development considerably. The largest fruits were produced by plants having leaf nutrient status of 1.40 per cent N, 0.08 per cent P and 3.43 per cent K. The application of growth regulators and chemicals was responsible for low sucker production. Ethrel at 1250 ppm retarded the sucker production to a maximum extent.ThesisItem Open Access Propagation studies in cocoa(Department of Horticulture (Plantation Crops), College of Horticulture, Vellanikkara, 1979) Kesavachandran, R; KAU; Sivaraman Nair, RA study on the different aspects of propagation of cocoa was undertaken at the College of Horticulture from May 1978 to July 1979 to standardise the criteria for selecting the pods, seeds and seedlings for raising the nursery, to find out the optimum size of polythene bags and the suitable medium for raising the nursery and also to standardise the best vegetative propagation methods for cocoa. The results had indicated that the volume and weight of the pods varied within the three classes of pods namely large, medium and small. There was not much variation in the number of seeds among the three classes of pods and the mean number varied between 30 to 42. The number of seeds were found to be highest in pods harvested in February and March followed by April. The highest percentage of germination was recorded in March followed by February, January, December and April. The size of the pod and the position of seeds (pedicel end, middle and distal end) had no significant influence on the germination and the growth of the seedlings. However, the large and medium sized pods are found to produce better seedlings. Based on the studies the following recommendation are made i) Large and medium sized pods weighing more than 350g each with not less than 400 cc volume should be selected for raising the nursery during the month of February and March. ii) The seed should be sown on the same day of harvest but it can be stored under room conditions upto six days. The percentage of germination will be decreased to 66 per cent by the sixth day. iii) A selection criterion for selecting the seedlings when they are three months old is recommended. The seedlings should have atleast 30cm height and 10 or more number of leaves when they are three months old. For raising three to five month old seedlings, the optimum size of bag is found to be 30 x 20 cm and the best medium for raising cocoa nursery is a mixture soil, sand and farm yard manure in the proportion 1:1:2. Considering the pattern and extent of root and shoot growth of the seedlings, planting the seedling when they are three to four months old is suggested. For higher percentage of rooting and optimum number of roots and higher root length, a ‘quick dip’ method for 60 sec in 4000 ppm NAA or 6000 ppm IAA is recommended for producing rooted cuttings. A ‘mist chamber’ method is suggested for rooting the cuttings. Forkert method of budding is recommended for cocoa either on eight to nine months old root-stocks or by green budding on three to four months old root-stock. The best time for budding is February and March on older root-stocks and April and May for green budding.ThesisItem Open Access Morphological studies and quality evaluation of turmeric types(Department of Horticulture (Plantation Crops), College of Horticulture, Vellanikkara, 1978) Joseph, Philip; KAU; Sivaraman Nair, P CA study using 19 turmeric types was conducted during the period from April 1977 to June 1978 at the College of Horticulture, Vellanikkara with a view to find out the possibility of distinguishing different types based on morphological parameters, to screen out the types with high yield and quality, to evaluate their relative susceptibility or tolerance to important pests and diseases and to study the yield and quality variations at different periods of maturity. The study revealed that morphological characters are not reliable to classify the turmeric types, although some of them can be distinguished by rhizome characters. The morphological characters such as the height of plant, length and breadth of leaf, leaf area index, petiole length, number of leaves per tiller, number of roots per plant, length of root, length of primary fingers and girth of mother rhizome were positively correlated with yield, whereas the intensity of shoot borer attack was negatively correlated with yield. All the types were susceptible to the incidence of ‘leaf spot’, ‘leaf blotch’ and shoot borer infection. The type VK5 (Mannuthy Local) showed the minimum incidence of pest and diseases. The yield of turmeric showed significant variation among the types. Maximum yield of green turmeric was noticed in the type VKI (Chayapasupa) whereas the type VK5 (Mannuthy Local) recorded the maximum yield of cured produce. Significant variation was noticed among the types with regards to the oleoresin and curcumin content. The oleoresin content varied between 12.1 and 21.1 per cent and the variation in curcumin content was from 2.33 to 6.55 per cent. The uncured turmeric samples had a higher content of oleoresin and curcumin than that of cured samples. The yield, percentage recovery of dry produce, oleoresin and curcumin varied significantly among the different periods of maturity in case of the types VK4 (G.L.Puram-II), VK5 (Mannuthy Local), VK17 (Armoor Cll-324) and VKII (Vontimitta). The dry yield, curcumin and oleoresin per hectare were maximum on 270th day whereas the maximum percentage recovery of oleoresin was on 180th and 270th day after planting. The types VK5 (Mannuthy Local), VK1 (Chayapasupa), VK2 (Kuchupudi) and VK3 (Kodur) can be recommended for large scale cultivation in the plains of Kerala as these types are found to be superior in yield of dry produce, oleoresin and curcumin per hectare. Of these VK5 (Mannuthy Local) and VKl (Chayapasupa) are preferred because of the low incidence of pest and diseases. The optimum time of harvesting turmeric is found to be on 270th day after planting under Vellanikkara conditions.
