Browsing by Author "Saraswathi, P"

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Assessment of genetic divergence by factor analysis in groundnut (Arachis hypogaea L.)
(Department of Statistics, College of Veterinary & Animal Sciences, Mannuthy, 1986) Muralidharan, K; Saraswathi, P
Factor analysis, Principal component analysis, discriminent analysis, and cluster analysis were carried out with a multivariate data on 30 characters of 62 bunch type groundnut varieties grown in upland during khariff 1982 and rice fallows during summer 1982. Vegetative, reproductive and growth factors were identified as the causative factors of genetic divergence in both the environments. A height factor was also found to work with rice fallows. The characters which were most amenable to change due to selection in these factors were identified. They were not found to agree with the results obtained from discriminant analysis. When factor loadings were estimated from principal components, clustering of characters were found identical to those obtained from factor analysis.
Biennial tendency among coconut hybrids a stastical study
(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1989) Lathy, K S; Saraswathi, P
The present study deals with the objective of estimating the magnitude of biennial tendency among coconut hybrids and WCT and to test for their significance. Non parametric and parametric approaches were tried for the study. The intensity of crop fluctuations was also estimated. The magnitude of biennial tendency was 100 per cent, 52.26 per cent and 84.34 per cent respectively for the WCT palms taken from RARS, Pilicode; RARS, Kumarakam and CRS, Balaramapuram. 100 per cent bienniality was observed for the WCT palms which were subjected to NPK manuring and for the hybrid varieties NCD, LO x GB and CC x GB palms. 97.59, 94.12, 80, 83.33, 80, 71.42, 66.67, 95.69, 88.89 and 25 per cent of the palms of WCT x CDG, WCT x GB, AO x GB, Java x GB, LS x GB, T x G, T x SS, T x D, T x GB and komadan exhibited biennial tendency. T x AD and T x LD palms showed only 14.29 per cent bienniality. Intensity of crop fluctuations was less than 50 per cent for almost all these varieties. The distribution of palms in the ‘on’and ‘off’ phase also established the existence of biennial tendency. The test of significance of biennial tendency established the existence of biennial tendency established the existence of biennial tendency among all the WCT and hybrid palms except for T x AD and T x LD. The time-trend was not found to be a significant characteristic for almost all the varieties. WCT palms which were subjected to fertilizer management during the period of the study and WCT x cdg palms were found to be influenced by both the time-trend and biennial tendency.
Factor analysis of genetic divergence in Sesame
(Department of Statistics, College of Veterinary & Animal Sciences, Mannuthy, 1988) Tes P Mathew; Saraswathi, P
Sesame is an important annual oil seed crop grown in India. It is grown in a very limited area of 1453 hecters in Kerala. The lack of high yielding varieties suitable to the seasons in different regions was the main factor limiting the productivity of sesame in our State. The genetically divergent parents will produce better segregants in the hybridisation programme. The present study was undertaken to delineate the underlying causes of divergence in the sesame plants using the factor analytic methods.
Standardization of field plot technique for cashew
(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1986) Lucyamma Mathew; Saraswathi, P
The present study deals with a plot technique for conducting field experiments on a biologically heterogeneous tree crop cashew by applying a well known result in sampling theory that the clusters formed with negative intraclass correlation are relatively more efficient Cashew being a perennial crop are sensitive to variation in fertility status of soil in which they grow, susceptable to mishaps, long gestation period etc Because of their large size and long life they are considerably different from annuals or field crops as to need special considerations in designing experiments with them. The experimenter is always faced with the dlffiiculty of getting uniform experimental trees on account of the biological variation present among the individual trees. The difficulty in getting experimental trees with uniform yield or some other measurable characteristic of the tree and some considerations in overcoming this problem is discussed. Achieving greater homogeneity between plots within a block by creating greater heterogeneity within plots is found to be a better field plot technique for experiments with adult trees on cashew. Similar techniques are also applicable to other plantation crops which are subjected to high biological variation.
Trends in production of certain agricultural crops in Kerala
(Kerala Agricultural University, 1976) Saraswathi, P; Thomas, E J
The log-normal model is fitted to data on production of crops namely rice, tapioca, coconut, arecanut, pepper, tea, coffee, rubber and cashewnut in Kerala, for the period 1952-53 to 1973-74, except for tapioca for which data for the period 1963-64 to 1973-74 only have been utilised. It is found that the models give satisfactory fit to the data. Estimates of production for the period 1975-76 to 1977-78 have been obtained using these models.
Urease activity in rice soils as influenced by moisture regimes and rice rhizosphere
(Kerala Agricultural University, 1993) Saraswathi, P; Balachandran, P V
Urease activity in six rice soils of Kerala namely laterite (Oxisol), karappadam (Inceptisol), kari (Inceptisol), kole (Inceptisol) and black soil (Vertisol) were studied at 60% WHC and under submergence. The pattern of urea hydrolysis was same at 60% WHC and under submergence. While the black soil exhibited the highest urease activity, kari soil registered the lowest activity. When soils were incubated for periods longer than 5 h (at both the moisture regimes) the urea hydrolysis was complete within two days in laterite, karappadam and kayal soils. For black and kole soils it took five days and for kari soil 30 days for the completion of urea hydrolysis. The rice rhizosphere was found to have a positive influence on urease activity and the maximum urease activity in the rhizosphere was noticed at 60lh day after planting.
Urease activity in rice soils of Kerala
(Department of Agronomy, College of Horticulture, Vellanikkara, 1989) Saraswathi, P; Balachandran, P V
An investigation on the urease activity of rice soils of Kerala was conducted at the College of Horticulture, Vellanikkara during the period 1987-1989. Representative soil samples were collected from six rice soils of Kerala, namely , laterite karppadam, kari, kayal, kole and black soil . The kinetics of urease activitywas worked out employing Lineweaver-Burk equation of double reciprocal plot. The effect of different factors like pH, soil submergence and rice rhizosphere on soil urease activity was investigated . A comparision of the efficiency of the different methods of urease assay was also made. The radioassay and autoradiograph of the plants which were allowed to absorb 14 C - urea were also done.