Browsing by Author "Gopakumar, K"

Now showing 1 - 11 of 11

Analysis of yield and its components in sweet potato (Ipomoea batatas L.)
(Kerala Agricultural University, 1976) Pushkaran, K; Sukumaran Nair, P; Gopakumar, K
Analysis was carried out for studying the yield-component inter-relationship in seventeen varieties of sweet potato. Determination of the coefficients of simple and mutual correlations and path at the levels of the first and second order components reveals that an increase in the length of vine causes significant increase in tuber yield. But at the same time, the overall area of leaf should not be allowed to increase, because this character bears a negative relationship with yield. An ideal plant type with longer vines, w i i i i small, narrow and deeply lobed leaves with appropriate orientation on the viue for effecting better photosynthetic efficiency, should be aimed at for selecting potentially high yielders.
Cross compatibility between abelmoschus esculentus and abelmoschus manihot and hybrid sterility
(Department of Plant Breeding, College of Agriculture, Vellayani, 1986) Prabha, P; Gopakumar, K
Observations made during 1985, while conducting a breeding experiment on interspecific hybridization in the genus Abelmoschus of family MALVACEAE, reveal that the virus caused Yellow Vein Mosaic disease susceptible bhindi varieties of the cultivated species esculentus cross readily with the resistant wild/ semi-wild species manihot. Absence of interspecific mating incompatibility is of advantage in programmes of breeding for evolving improved varieties of the crop with built-in-resistance. The first generation hybrids though do not produce viable seeds in profusion, are not totally sterile. The scanty viable seed recovery from the hybrids against the parents is suspected to be due to chromosomal differentation that could have taken place during speciation in the genus. The quantity of viable hybrid seeds recovered differs in different parental combinations. Recommendations are made in favour of identifying specificallyadvantages interspecific parental combinations and practicing controlled selfing on relatively more number of flowers in the hybrids to yield adequate seeds to generate subsequent progeny populations to enable selection for economic desirability and disease resistance.
Ergonomic influence of plant morphology on yield in sesamum
(Department of Agricultural Botany, College of Agriculture, Vellayani., 1990) Ganga Rani, B R; Gopakumar, K
The study is basic and appears new to its type. A prototype model to assess meritwise ergonomics in morphologically diverse seed propagated field crop communities in which seeds make the produce proper is presented. The approach seems to promise greater scope for varietal/genetic improvement of crops of the category as against the conventional multivariate methods that are being widely practiced. Trust is on the elaboration of the source and the flow of a part of it to make the sink. Hypothetical views on the influence of plant morphology on yield factor are expressed and their validity tested. Relevant aspects are discussed in detail. Cultivated sesamum represents the material studied.
Identification of prepotent motherpalms in coconut (Cocos nucifera L.) variety, KOMADAN
(Department of Plant Breeding, College of Agriculture, Vellayani, 1982) Shylaraj, K S; Gopakumar, K
A systematically arranged experiment on Pedigree Progeny Analysis was conducted during 1981-82 in the premises of the College of Agriculture, Vellayani, with 40 randomnly chosen trees of the coconutpalm, type KOMADAN. The advantages of following a Triphasic Selection Schedule carried out at the levels of the motherpalm population, seednuts and the one year old seedling progeny in the nursery, and the special worth of identifying, on the basis of the information made available through the conduct of the early seedling progeny analysis, the prepotent palms, are substantiated. Accordingly, a recommendation in favour of confining for benefit, extensive seednut collection, exclusively to such palms as mentioned above, identified from among those in a chosen lot, characterized by phenotypically distinguishable overall healthy outlook, followed by exposure to a procedure of more intensively rigorousselection in the nursery, of superior seedlings is proposed.
Occurrence of localised partial earhead sterility in a rtce mutant
(Kerala Agricultural University, 1969) Gopakumar, K; Sukumaran Nair, P
Occurrence of tricotyly in brinjal (Solanum mehngena, Linn.) and sweet potato (Pomoeo batatas, Lam.)
(Kerala Agricultural University, 1973) Sethumadhavan, P; Gopakumar, K
Path Analysis In Rice ( Oryaa sativa Linn. )
(Department of Agricultural Botany, College of Agriculture, Vellayani, 1978) Chalapathi, K; Gopakumar, K
When biometrical studies on forty divergent varieties of lndlea rice (Oryza satlva L.) were conduoted at the College of Agriculture, Vellayanl under tbe Kerala Agricultural University during June - September 1977, the estimates for genotypic correlation of yield and eight components, aad path co-efficient of yield aad the first, second aad third orders of components revealed that relatively short 3tatured plants having more number of panicle bearing tillers, and more number of heavier grains on relatively shorter panicles, preferably with a few primary branches, have been found to be ideal for a type having high grain yield potential. Therefore, it Is recommended that selection for high grain ylelders in this crop should be based on these criteria.'
Progeny studies in west coast tall coconut palms of different yield groups
(Department of Plant Breeding, College of Agriculture, Vellayani, 1982) Bindu, M; Gopakumar, K
Observations made during 1981-82, while conducting a Systematic Pedigree Progeny Analysis at the Coconut Research Station, Balaramapuram, on the coconutpalm, variety West Coast Tall, belonging to the categories of Low, Medium and High yielders, yielded valuable information so as to ensure realization of the desired effect in inducing an overall enhancementin the late stage seedling progeny performance standards. Earlier recommendations stressed the need for exercising phase protracted selection at the levels of the motherpalm population, seednuts and the seedling progeny stand in the nursery, on specified norms. The findings of this study help to develop a more reliable methodology for identifying distinctly, the vigorous from the less vigorous among the seedling progeny.
Selection parameters in tapioca (Manihot esculenta Crantz)
(Department of Agricultural Botany, College of Agriculture, Vellayani, 1980) Radhakrishnan, V V; Gopakumar, K
During a biometrical study conducted on 20 divergent types of tapioca (Manihot esculenta Crantz) in the premises of Central Tuber Crops Research Institute at Trivandrum, as a postgraduate programme of the Kerala Agricultural University, useful informations on the selection parameters become available. Accordingly, it was found that harvest index should be the best reliable criterion for effecting selection in favour of a desirable genotype from among others in a genetically heterogenic base population. Further, it is proposed that potentially high tuber yielders in the crop could be identified among relatively short statured ones with more number of large sized leaves that have become completely developed sufficiently early during development of the shoot. In addition , a tendency for relatively more number of leaves to become abscissed towards the time of harvest should also be considered as a positive sign of high tuber yield
Studies on correlation in bhindi (Abelmoschus esculentus L. Moench)
(Division of Agricutural Botany, Agricutural college and research Institute Vellayani, Trivandrum, 1969) Martha Mary, K J; Gopakumar, K
An attempt has been made to study the relationship between yield and several of the component characters as height of plant,number of leaves, number of branches, thickness of stem, number of flowers, number of fruits, yield of fruits(in weight), length of fruti, birth of fruit, percentage of fruit set and meen weight of fruits in ten different varietiesof bhindi. The anaysis of varience has shown that the varieties do not differ significantly from one another for those characters except for number of branches and mean weight of friuts.
Testing for prepotency in coconut palm
(Kerala Agricultural University, 1987) Shylaraj, K S; Gopakumar, K