Browsing by Author "Kannan, K"

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Early performance of mandarin oranges (Citrus reticulata Blanco.) of different rootstocks in the submontane region of Wywad in Kerala
(Kerala Agricultural University, 1988) Devadas, V S; Jessy M Kuriakose; Kannan, K
Twenty stionic combinations involving scions of five mandarin orange varieties and four rootstocks were evaluated for their performance under the agroclimatic conditions of Wynad, Kerala since 1980. The first six years study showed that Coorg mandarin on Rough lemon was the most vigorous combination in respect of all the biometric characters recorded. Rough lemon was the most invigorating rootstock, while Trifoliate stock induced dwarfness of scions. Though it was too prematureto assess the yield potential, data recorded in 1984, 1985 and 1986 showed that Coorg mandarin on Rough lemon was comparatively higher in yield than most other combinations. With regard to quality also, it was on par with other combinations. Further studies will be continued.
Effect of gamma radiation on the sucker production in banana rhizomes
(Kerala Agricultural University, 1978) Gopimony, R; Kannan, K
Effect of top dressing with urea at flower initiation time in 'zanzibar' variety of banana
(Kerala Agricultural University, 1979) Gopimony, R; Marykutty, K C; Kannan, K
Herbicidal control of weeds in pineapple variety kew
(Kerala Agricultural University, 1976) Balakrishnan, S; Pillai, G R; Kannan, K; Gopalakrishnan, R
A herbicidal trial on pineapple variety 'Kew' was undertaken at the Pineapple Research Centre, Kerala Agricultural University Vellanikkara during the years 1974-76 to test the efficacy of diuron and bromacil at different doses- The herbicides in general effectively controlled a broad spectrum of weeds. Among different dosages tried, diuron 3 kg per hectare was more effective and the treatment gave significantly increased yield without producing any harmful effects to fruit quality. From the point of economics also, diuron 3 kg per hectare was more economical.
Mango breeding
(Kerala Agricultural University, 1976) Kannan, K
Breeding of mango was undertaken at the Agricultural Research Station, Taliparamba, Kerala from 1954 to 1960 and 217 hybrids in 34 parental combinations were produced. From detailed studies conducted so far, four hybrids i.e. hybrid Nos. 45, 56, 87 and 151 were selected as promising for large scale cultivation under the climatic conditions of Kerala.
Mother palm and seedling selection in coconut
(Kerala Agricultural University, 1979) Kannan, K; Narayanan Nambiar, P K
Studies were undertaken at the Coconut Research Station, Pilicode to find out influence of mother palm and seedling selection on the performance of the progenies. Palms yielding more than 80 nuts per annum and palms selected at random (bulk mother palms) are found to produce high yielding progenies. Palms giving an yield of less than 20 nuts are defenitely unsuitable for seednut selection. Seedling selection though necessary need not be as stringent as is advocated at present since the yield difference between vigorous and intermediate seedlings is not significant. However, for ensuring better establishment, early flowering and higher yield, poor seedlings should be rejected.
Note on germinating seeds of pineapple (Ananas comosus merr.)
(Kerala Agricultural University, 1976) Gopimony, R; Balakrishnan, S; Kannan, K
Pollination studies in pineapple varieties
(Kerala Agricultural University, 1976) Gopimony, R; Balakrishnan, S; Kannan, K; Gopalakrishnan, R
study was undertaken using four varieties of pineapple to find out the time of anther debiscence and flower opening, time interval between various stages of flower development and best time of hand pollination for maximum seed production, i !u- time of flower opening and anther dehiscence in 'Kew* pineapple was found to be between 4 . 1 5 am and S a m The time interval between various stages of flower development was studied and found to be much shorter than those observed under Hawaii conditions. The results from the pollination trialshave shown that hand pollination in 'K.ew' variety of pineapple using pollen from three other compatible varieties can be successfully done at any time between 4.15 and 10.45 am.
Relationships between seed and seedling characters in cocoa (Theobroma cacao L.)
(Kerala Agricultural University, 1982) Rajamony, L; Neelakantan Potty, N; Jayaprakash Nair, B; Kannan, K
Research notes on comparative yield performance of different types of ginger
(Kerala Agricultural University, Vellanikara, 1969) Thomas, K M; Kannan, K
Sodium chloride nutrition of coconut palms
(Kerala Agricultural University, 1984) Samuel Mathew; Jose, A I; Narayanan Nambiar, P K; Kannan, K
An experiment was conducted at the Coconut Research Station, Pilicode, Kerala to study the effect of substitution of potassium applied to coconut by sodium. Twentyfour year old coconut palms grown in laterite soil and which received N,P and K at the recommended dose were selected for the study. Replacement of potassium applied as KCI at the rate of 1000 g K20/palm/year to the extent of 50% or even 75% by Na.,0 applied as NaCI for 5 years did not reduce the yield of nuts. Application of NaCI at this rate for 5 years to the laterite soils of Pilicode receiving fairly good rainfall did not alter the pH, EC and aggregate stability of the soil.
Studies on the open pollinated progenies of tall X dwarf coconut hybrids
(Kerala Agricultural University, 1976) Kannan, K
A study of the performance of the open pollinated progenies of T x D palms was conducted at the Coconut Research Station, Pilicode. Considerable reduction in the expression of hybrid vigour was observed from the iiisi generation T x D to the second generation open pollinated progenies. In respect of age at first flowering growth rate and leaf production they were more equal to the West Coast Tall than to T x D. About half the population gave higher yield of nut and copra than the parents while the other half was low yielders. A few of the parent palms produced high percentage of high yielders which may be due to prepotency.
Variability studies in the seedling progenies of T*D coconut hybrids
(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1981) Valsala, P A; Kannan, K
A study was conducted at the Instructional Farm , Vellanikkara , during 1979-80 with the objective of assessing the extent of variability in the seedling progenies obtained from open pollinated seednuts of tall x Dwarf (F1) palms Seednuts were collected from 30 Tall x Dwarf F1 palms belonging to six family groups and the experiment was laid out in completely randomised design with family groups as treatment and progeny as replication The present investigation emphasised the utility of selection of high yielding West Coast Tall palms in controlled mating for the production of Tall x Dwarf hybrids and showed the stability of superiority of Tall x Dwarf hybrids even under poor environmental conditions. The percentage of vigorous , medium and poor seedlings produced by each (F1) progeny was found to be independent of the productivity of the palm under open pollinated condition . There fore , collection of seednut from high yielding TxD progenies for further propagation should be resorted with great caution . Progenies of the same parent have shown considerable difference in respect of the number of days taken for germination giving an indication of the variability existing in the TXD palme , in their capacity for production of early bearing and high yielding f2 progency. The petiolar colour of the grand parents and f1 progenies were green, while the F2 progenies showed segregation with green , bronze, orange and yellow colour. Four progenies each of grand parents Vlll/23 and l/58, and two progenies each of Vlll/158, I/76, Vlll/143 and 1/109 have been identified as prepotents on the basis of seedling performance . Seasonal variations were noticed on yield, size and weight of nuts. The total chlorophyll content in the leaves of the vigorous seedling which were potential high yielders were found to be high. Early germinated nuts produced seedling having more collar girth and as such greater vigour.