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1997 - 19982
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Author: KAU × Author: Latha, A × End date: 1999 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Varietal reaction to nutrient and moisture stress in Cashew (Aracardium occidentale L.)
    (Department of Agronomy, College of Horticulture, Vellenikkara, 1998) Latha, A; KAU; Abdul Salam, M
    Five experiments were conducted at Cashew Research Station, Kerala Agricultural University, Madakkathara during 1996-98 to identify drought tolerant varieties of cashew, to study the response of cashew to applied N at different levels of drip irrigation and to assess the tolerance of cashew varieties to N, P and K deficiency in soil. The abstract of the experiments is given below. Exp. I. Varietal variation in drought tolerance The varieties H-1591, M-26/2, V-5 and M-44/3 are drought tolerant and K-22-1 is drought sensitive. Exp. II. Response of cashew to applied N at different levels of irrigation (drip) N application @ 1500 g per tree per year along with irrigation @ 80 litres per tree per day (through drip) is essential in the state of Kerala for obtaining best results from cashew. Exp . lIl. Tolerance of cashew varieties to N dificient soils The varieties H-1591 and M-2612 are efficient for N deficient soils. The N use efficiency of cashew seedlings grown under pot culture was 24.7 per cent. Exp. IV. Tolerance of cashew varieties to P deficient soils H-1591 is an efficient variety for P deficient soils. The P use efficiency of cashew seedlings grown under pot culture was 8.02 per cent. Exp. V. Tolerance of cashew varieties to K deficient soils The varieties H-1591, M-26/2 and H-1598 are efficient for K deficient soils. The K use efficiency of cashew seedlings grown under pot culture was 12.17 per cent. N, P and K absorption of a six month old cashew seedling was in the order of 151.95 mg N, 21.58 mg P and 49.48 mg K per plant with a nutrient absorption ratio of7: 1:2 (approximately). The variety H-1591 is a super variety capable of tolerating not only drought but also N, P and K deficient soils. The variety M-26/2 is capable of tolerating drought as well as N and K deficiency in soils. The variety K-22-1 is drought sensitive.
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    ThesisItemOpen Access
    Consequences of conversion of marginal homesteads for planting rubber in Kottayam district
    (Department of Agricultural Extension, College of Horticulture, Vellanikkara, 1997) Latha, A; KAU; Ranjan S, Karippai
    A study was conducted in Kottayam district to find out the causes and consequences with respect to the nature, extent and conversion (composite index developed from nature and extent) of marginal homesteads for planting rubber. The respondents included 200 convertors and 100 non-convertors. The study revealed that outmigration of hired labour, availability of hired labour, farming experience and perception about attributes of rubber cultivation could explain the maximum discrimination between convertors and non-convertors. Among the eighteen independent variables selected, availability of family labour and number of crops emerged as the most important factors influencing conversion. Gross cropped area and number of crops could explain the maximum variability of conversion. Net area under rubber was the factor which exerted maximum influence on other variables effecting conversion. The most important consequences of conversion expressed by convertors were outmigration of hired labour, outmigration of family labour, soil loss (erosion) based on magnitude and decrease in water availability, increase in social status and decrease in water table based on directionality. Community based land use strategy which involved production and sharing of farm produce among groups of individual homesteads based on similarity of topography, soil type, water resource dependence, local needs may become inevitable to sustain and maintain the diverse requirements of local communities in place of conversion of homesteads to monocrops like rubber alone. Rubber could only become a part of such land use systems.