1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

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Subject: search.filters.subject.Dry matter production

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    Intraclonal variations and nutritional studies in banana cv. Palayankodan
    (Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1985) Rajeevan, P K; Mohanakumaran, N
    The investigations were carried out at the Banana Research Station, Kannara, during 1981-84 in the banana cv. 'Palayankodan'. Twenty four accessions were subjected to detailed analysis with respect to growth, yield and quality. The plants of the accessions differed significantly with regard to height and girth of pseudostem during the later stages of growth , both in the plant crop and in ratoon 1. Significant differences observed in the number of functional leaves were not consistent. Area of the third leaf at shooting varied significantly in all the three crops. The trend in variation between the crops, however, was not consistent. Interval of leaf production, total number of leaves produced and the density of stomata in the upper surface of the leaf lamina showed significant differences. The duration from planting to shooting in ratoon 1 alone varied significantly. The plant crop took more time than ratoon 1 and ratoon 2 to come to harvest. The content of nutrient elements in the index leaf did not exhibit significant variations. The reactionof the accessions to the important pest (rhizome weevil) and diseases (bunchytop and Sigatoke) varied considerably.
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    Evaluation of ginger cultivars for shade tolerance
    (Department of Agronomy, College of Horticulture, Vellanikkara, 1992) Beena Elizabeth George; Sreedevi, P
    A study entitled 'Screening of ginger cultivars for shade tolerance' was conducted during May 1990 to February 1991 at the College of Horticulture, Vellanikkara, Thrissur, Kerala, India. Two separate trials were carried out, one under artificial shade and the other under natural shade in coconut gardens. The trial under artificial shade was intended to assess the performance of ginger cultivars under different levels of shade, while that under natural shade was taken up to test the fitness of these cultivars under intercropped situation in coconut garden. Trial under artificial shade was laid out in split plot design with four shade levels (0, 25, 50 and 75 per cent shade) as main plot treatments and six cultivars (Maran, Kuruppampadi, Himachal, Rio-de-jeneiro, Nudumangad and Amballore local) as subplot treatments with four replications. The trial under natural shade was laid out in randomised block design with five cultivars (Maran, Kuruppampadi, Himachal, Nedumangad and Amballore local) and four replications. For providing shade under artificial shade trial, pandals were erected on wooden frames and covered with unplaited coconut fronds to provide required levels of shade. LI-90 A Quantum sensor and LI-191 SA Line Quantum sensor were used for adjusting the shade intensities to the desired levels. As the overall performance of the crop was better under shade than in the open, ginger may be classified as a shade loving crop. Rhizome yields at 25, 50 and 75 per cent shade levels were comparable and significantly higher than that under direct sun with 25 per cent shade recording the highest value. Yield parameters such as harvest index and total- dry weight were also highest at 25 per cent shade. Significant interaction was noticed between shade levels and ginger cultivars on rhizome yield. Himachal was found to- be adapated to all situations. Quality of ginger rhizomes was found to be improved when grown under shade. Nutrient uptake was also higher under shaded situation. Based on the rhizome yield the cultivars adapted to each of the shade levels are as follows. 0 per cent shade - Kuruppampadi, Himachal 25 per cent shade- Nedumangad, Himachal, Maran, Kuruppampadi 50 per cent shade - Himachal, Kuruppampadi, Maran, Nedumangad and Amballore local 75 per cent shade - Himachal, Kuruppampadi The logarithmic model, log y = a+b(log x)+c(log x ) 2+d 3 (log x) was found to be a good fit for all the cultivars except Amballore local, for which the yield prediction could be well effected using the quadratic model (y = a+bx+cx2) . All the cultivars tested under natural shade, revealed no significant difference with respect to rhizome yield and most of the growth and yield attributes. Among the cultivars, Amballore local fared comparitively better under natural shade, where the percentage illumination was about 50 per cent. However, the performance of all the cultivars was poor in terms of rhizome yield under natural shade in coconut garden.
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    Response of ragi (Eleusine coracana Gaertn,) to different levels of nitrogen, phosphorus and potassium under rainfed conditions
    (Department of Agronomy, College of Agriculture, Vellayani, 1981) Johnkutty, I; Chandrasekharan, P
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    Effect of nutrition as Influenced by irrigation on growth and yield of oil palm (Elaeis guineensis Jacq)
    (Department of Agronomy, College of Agriculture, Vellayani, 1994) Thomas Varghese, P; Sreedharan, C
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    Productivity of ground nut (Arachis hypogaea L.) in summer rice fallows under different frequencies of irrigation.
    (Department of Agronomy, College of Horticulture, Vellanikkara, 1995) Muktha, T M; Savithri, K E
    A field experiment was conducted in the rice fallows of the Agricultural Research Station, Mannuthy during the summer season (February –May) of 1994 to identify a groundnut variety suitable for summer rice fallows and to find out the effect of different irrigation frequencies on the growth and yield of the crop. The experiment was laid out in split plot design with three replications. The main plot treatments were five frequencies of irrigation viz. no irrigation and irrigation at IW/CPE ratios of 0.25, 0.50 and 0.75 and 1.0. The subplot treatments were three varieties of groundnut viz. TG-3 Co-2 and VRI-3. Irrigation at closer intervals (IW/CPE ratios of 0.75 and 1.0) improved the growth characters like number of branches, leaf area index and dry matter production. Moisture stress during early growth stages delayed flowering and adversely affected nodulation. Yield attributes like number of pegs per plant, weight of pods per plant and shelling percentage were improved by higher frequencies of irrigation (IW/CPE ratios of 0.75 and 1.0). The highest pod yield (2408 kg/ha) was obtained when crop was irrigated at IW/CPE ratio of 1.0 which was on par with that at IW/CPE ratio 0.75 (2288 kg/ha). Even though irrigation did not significantly influence protein and oil content of kernels, protein yield and oil yield were influenced significantly. Among the varieties, especially during the rainfree period (upto 50 DAS) VRI-3 produced the highest number of branches, drymatter and number of nodules per plant. Leaf area index was highest for Co-2. However TG-3 showed an early flowering, higher yield attributes and thereby highest pod yield. The variety VRI-3 was on par with TG-3 in pod yield. TG-3 gave the highest protein yield whereas VRI-3 gave highest oil content and oil yield. The results indicated that among the different frequencies of irrigation IW/CPE ratio of 0.75 was the optimum as it gave higher pod yield with lesser quantity of water. Among the varieties TG-3 was the best followed by VRI-3 in terms of economic yield.