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2017 - 20184
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Subject: Spices, Plantation and Medicinal and Aromatic Plants × End date: 2018 × Start date: 2016 × Type: Thesis ×
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    ThesisItemOpen Access
    Priming seed rhizome to enhance growth and yield of transplanted ginger (Zingiber officinale Rosc.)
    (Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 2018) Dharini Chittaragi; KAU; Jalaja, S Menon
    In Kerala, ginger is cultivated as a rainfed crop, usually planted during April - May and harvested during December - January with a subsequent storage of seed rhizome for a period of 3 to 4 months to raise the next crop. Raising a transplanted ginger crop can decrease seed rate to 500-700 kg per hectare from1500 kg per hectare, reducing the cost of cultivation. Yield from rhizome sprouts of 3-5 g used as transplants is reported to be on par with the conventional system of direct planting of 20 g rhizome seed. Bio-priming ginger rhizome before transplanting was also found to be beneficial in increasing the yield of off-season green ginger. Hence, the present study was conducted to analyze the performance of primed portray transplants of ginger at various planting times. The experiment was conducted in Department of Plantation crops and Spices, College of Horticulture, Vellanikkara using seed rhizomes of variety Aswathy. The research work was grouped into three experiments viz., studies of seed rhizomes during storage, effect of priming on ginger transplants in the nursery and field performance of primed protray raised ginger transplants. Studies on seed rhizome revealed that, a weight loss of 28 per cent was recorded in the seed rhizomes stored in Zero Energy Cool Chambers for three months (February to May 2017). Seed rhizome buds varied in length from 0.847μm to 2.19μm and breadth from 1.19 μm to 0.703μm before storage and at three months after storage respectively. Histochemical comparison of the rhizomes showed that the size of starch grain decreased from 40μm to 20 μm and the size of oil globules increased from 20 to 40 μm on three months’ storage. The performance of primed protray raised ginger transplants in nursery was assessed with 13 treatments during four planting times viz., February, March, April and May to identify the optimum planting time and priming treatment for seed rhizomes. The study revealed that, priming had influence on survival rate. The mean survival per cent of seed rhizomes planted in May (3MAS) was found to be superior (58.89%) to all other planting times irrespective of the priming treatments. The survival per cent of seed rhizome planted immediately after harvest (February) was the least (11.6%). However, the survival of seed rhizomes was found to increase drastically to 50.3 per cent and 50.1per cent during March (1 MAS) and April (2 MAS) respectively. In pooled analysis, seed rhizome primed with Ethephon 200 ppm performed better to all other priming treatments with a survival rate of 68.66 per cent irrespective of planting season. In transplants raised in March and April, priming with Ethephon 200 ppm was found to be superior with high survival per cent (96.9 and 99.0 % respectively). However in May, seed rhizomes primed by soaking in water for one hour (88%) was on par with soaking in water for half an hour (84.03%). These transplants were field planted at 45 days after sowing in nursery to polybags under partial shade at four planting time’s viz., March, April, May and June. The fresh rhizome yield was superior in transplants planted in the month April (451.83g/p) irrespective of priming treatments. In pooled analysis, the fresh rhizome yield from seed rhizome primed with Ethephon 200ppm (372.33g/p) was superior irrespective of planting seasons. Other priming treatments viz., Humigration (340.21g/p), Trichoderma viridae (343.89g/p), Pseudomonas fluorscens (340.2g/p), Trichoderma viridae + Pseudomonas fluorscens combination (335.94 g/p) and soaking in water for 1 hour (355.62g/p) were also on par with that of Ethephon 200 ppm with respect to fresh rhizome yield. The quality parameter like oil, oleoresin and crude fibre varied according to the planting season. Irrespective of the priming treatments, the oil content was high in the crop raised during March (1.42%). Priming with a combination of Trichoderma viridae + Pseudomonas fluorscens (0.96%), Hydropriming (0.86%), Humigration (0.91%) and Pseudomonas fluorscens (0.87%) were also superior in rhizome oil content, irrespective of planting time. The result indicated that to obtain maximum fresh rhizome yield, the optimum time of raising nursery is March (1 MAS) using seed rhizomes primed with Ethephon 200ppm. Seed rhizomes primed with Pseudomonas fluorscens, Trichoderma viridae, Humigration and Soaking in water can also be recommended considering the higher fresh rhizome yield and survival per cent in the nursery with a low seed rate.
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    ThesisItemOpen Access
    Nutrient scheduling in bush pepper (piper nigrum L.)
    (Department of Plantation Crops and Spices College of Agriculture, Vellayani, 2018) Farhana, C; KAU; Sreekala, G S
    The present study entitiled “Nutrient scheduling in bush pepper (Piper nigrum L.) was taken up with the specific objective to standardize potting media and nutrient level in bush pepper for yield. The pot culture experiment on bush pepper was carried in the Department of Plantation Crops and Spices, College of Agriculture, Vellayani during the period 2017-18 using variety Panniyur 1.The efficacy of different combinations of organic manures and different levels and intervals of inorganic fertilizers were evaluated. The experiment was laid out in completely randomized design with three different types of potting media (P1, P2, P3), five inorganic fertilizer treatments (I1, I2, I3, I4, I5) and a control. The different types of potting media used were soil + FYM + neem cake + coir pith compost (P1), soil + FYM + vermicompost + coir pith compost ( P2) and soil + FYM + leaf compost + coir pith compost (P3) in the ratio 3:3:1:1. Inorganic fertilizers applied at different levels and intervals were I1- 37.5: 37.5: 50.0 g of NPK plant-1 year-1at monthly splits, I2 - 37.5: 37.5: 50.0 g of NPK plant-1 year-1 at quarterly splits, I3 - 25.0: 25.0: 50.0 g of NPK plant-1 year-1 at monthly splits, I4 - 25.0: 25.0: 50.0 g of NPK plant-1 year-1 at quarterly splits and I5 - 12.5:12.5:25.0 g of NPK plant-1 year-1 as soil application at equal monthly splits up to 3 MAP and foliar application of 13:0:45 (0.5 %) at fortnightly intervals from 4th MAP. The control treatment contained soil + sand+ FYM, (1:1:1) as potting mixture and inorganic fertilizer applied as per package of practices recommendations of KAU (1.0, 0.5, 2 g NPK plant-1 at bimonthly interval). Trichoderma @ 1 g kg-1 of potting medium and lime @ 50 g plant-1 were applied to all the treatments. The results of the study revealed that potting media containing soil + FYM + vermicompost + coir pith compost (3:3:1:1) and inorganic fertilizers applied at the rate of 25.0: 25.0: 50.0 g of NPK plant-1 year-1at quarterly splits (p2i4) recorded significantly higher plant growth characters like number of secondary branches, length of primary branches, length of secondary branches, number of leaves and leaf area from 8MAP to 12 MAP. Fresh weight, dry weight and volume of roots at 12 MAP were also significantly higher for the treatment combination, p2i4 Significantly higher dry matter production (150.92 g plant-1) at 12 MAP and chlorophyll content at 6 MAP was noticed in p2i4 while dry matter production was the least in control (72.42 g plant-1). The yield attributes like number of spikes plant-1, length of spike, number of berries spike-1, hundred berry weight, hundred berry volume, fresh and dry weight of berries were significantly higher for p2i4 recording a dry yield increase of 98 per cent over the control. Quality parameters of berries revealed that essential oil, oleoresin and piperine were highest in p2i4 while highest starch content was obtained in p1i5. . The total uptake of nitrogen, phosphorus and potassium by bush pepper was significantly superior with a higher uptake of N (2.159 g plant-1), P (155.17 mg plant- 1 ), K (2.367 g plant-1), Ca (1.577 g plant-1), Mg (296.64 mg plant-1) and S (253.34 mg plant-1) in p2i4. Higher nitrogen harvest index (33.58 %), phosphorous harvest index (41.03 %) and potassium harvest index (31.41 %) were recorded from p2i4, indicating that nutrient removal in bush pepper was proportional to the yield. The discounted benefit-cost ratio was 2.51 with 67 % of Internal Rate of Return (IRR) for p2i4 implied that investments made in bush pepper following the above treatment was highly profitable. The results of the study indicated that growing bush pepper in potting medium containing soil + FYM + vermicompost + coir pith compost ( 3:3:1:1) with the application of inorganic fertilizers @ 25.0: 25.0: 50.0 g of NPK plant-1 year-1 scheduled at quarterly intervals produced better growth characters like number of secondary branches, length of primary and secondary branches, number of leaves, total leaf area , root dry weight and yield parameters like number of spikes and number of berries spike-1 which ultimately doubled the yield compared to the package of practices recommendations of KAU.
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    ThesisItemOpen Access
    Characterisation of boron deficient coconut palms (Cocos nucifera L.)
    (Department of Plantation Crops and Spices, College of Agriculture, Vellayani, 2017) Athulya, S Nair; KAU; Sreekala, G S
    The experiment entitled ‘‘Characterisation of boron deficient coconut palms ( Cocos nucifera L.)” was undertaken at farmer’s field in Kalliyoor panchayat of Thiruvananthapuram district during the period from April 2015 to March 2016. The objective of the study was to identify boron deficient coconut palms and predisposing factors responsible for deficiency based on the visual diagnosis and to study the morphological characters of boron deficient and healthy coconut palms. The survey was conducted among hundred coconut palms in Kalliyoor panchayat of Thiruvananthapuram district to identify coconut palms deficient in boron based on visual symptoms listed by CPCRI. Based on the symptoms a ten scale score was developed and boron deficient palms were categorized as mild, moderate and severe intensity and compared with soil and plant boron status . The field, soil , plant characteristics and management aspects of coconut palms deficient in boron were identified based on questionnaire prepared. The morphological and yield parameters were observed at 45 days interval for one year in five palms each from mild, moderate and severe intensity and was compared with healthy palms. The results of the survey showed that the boron deficiency in palms were restricted to age group between 20-45 years grown on red loam soil with pH 6.0-7.5. The deficiency symptoms were common in coconut fields where intercropping was practiced (63 %) and in other fields with poor agronomic management (37 %). Mite and coreid bug attack were prominent ( 89 % and 53 % respectively). Diseases among deficient palms were restricted to 26 percentage and leaf rot was the major one. Common visual symptoms of palms with mild intensity were reduced leaf size, length. hooked leaves, fused leaves, and leaflets with relatively higher internodal Necrotic inflorescence, reduced nut set, poor nut size, nuts with hen and chicken symptoms and crowded crown were prominent in moderate to severely intensity groups. The morphological and yield parameters of selected palms of four groups indicated significant difference between palms of healthy and severe intensity for number of leaves, leaflet internodal length, number of female flowers per bunch of unfertilized inflorescence, opened and unopened spadices, bunches per palm, malformed nuts, volume of nut water, weight of embryo and shell throughout the observation period . The cortical cells of root were loosely packed for boron deficient palms of moderate and severe intensity. Nuts from healthy palms when compared with that from the mild, moderate and severe intensity differed significantly with respect to weight of unhusked nut, weight of husked nut, nuts set per bunch, nuts per palm per year, polar and equatorial diameter of unhusked nut, thickness of husk , weight of opened nut, thickness of meat, weight of kernel ,weight of copra and oil content and the difference was proportional to enhancement in intensity of deficiency. The available boron status in soil and plant were significantly superior in healthy palms. Identification of predisposing factors revealed poor agronomic management, intensive cultivation and low organic matter resulted in B deficieny in Coconut growing areas. The results indicated that B had marked influence in enhancing the yield characteristics of coconut particularly of thickness of meat, weight of kernel, weight of copra, oil content etc. There is a significant reduction in the yield of deficient coconut compared to that of healthy palms. The study thus substantiate the importance of boron in the nutrition of coconut palms.
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    ThesisItemOpen Access
    Standardisation of agro techniques for transplanted ginger ( Zingiber officinale rosc.)
    (Department of Plantation Crops and Spices, College of Agriculture, Vellanikkara, 2017) Sandra Merin, Mathew; KAU; Sreekala, G S
    ulches @30,15, and 7.5 t ha -1 (M1,M2,M3 respectively) and plastic mulch (M4). For M1 and M2, half the quantity of organic mulch was applied at the time of transplanting and the remaining at two months after transplanting sub plot treatments were T1(75:50:50kg of NPK ha-1), T2(150:100:100 kg ha-1), T3(T1+foliar application of 19:19:19 @ 0.5% applied at 1,3,4 MAT and T4(100:75:75 kg ha-1+foliar application of 19:19:19 @0.5% applied at 1,2,3 MAT). For all treatment except C2, half N, full P and half K were applied at the time of transplanting and remaining half N, half K applied at two MAT. Two control plots, one with ginger rhizomes planted with recommended nutrient level as per KAU POP (C1) and other absolute control (c2) was also included. Two nodded rhizome bits of ginger cultivar was raised in portrays with Trichoderma enriched coir pith compost and FYM in the ratio 2:1 for treatments except C1, and were transplanted at 11/2-2 months age in beds taken in the interspaces of coconut. FYM @ 30 t ha-1 was applied uniformly to all plots except absolute control. The result revealed that growth parameters like plant height, number of leaves per plant, shoot weight, dry matter production, net assimilation rate, leaf area index, leaf area duration were significantly higher for mulch, M1 (30t ha-1) and fertilizer dose, T2 (150:100:100 kg ha-1 NPK). The yield attributes like fresh yield, dry yield, harvest index, dry recovery, rhizome thickness, rhizome spread were significantly higher for M1 and T2. Considering the treatment interaction increased growth, yield character, uptake of N,P,K, agronomic efficiency of N,P,K were observed with mulching @30 t ha-1 along with a fertilizer of 150:100:100 kg ha-1NPK(m1t2). The quality parameters of ginger rhizome at harvest viz., starch, oil, fibre. Non Volatile Ether Extract ( NVEE) were higher for M1 while for starch and NVEE it was on par with M4. Starch, volatile oil, NVEE and fibre were more for T2 while the volatile oil content in T2 was on par with T4 at the time of harvest. Among combinations m1t2. (mulching @ 30 t ha-1 with 150:100:100 kg ha-1 NPK) significantly increased starch, fibre, oil and NVEE on all stages of observation. The weed count and weed dry weight were significantly low in treatments with plastic mulch. Nutrient balance sheet studies revealed the significance of plastic mulch in reducing the net loss of nutrients. The treatment combination, m1t2 registered higher net profit and B: C ratio. The results of the study indicated that of ginger transplants intercropped in coconut garden, that mulching @ 30 t ha-1(half at transplanting and half 2 MAT) along with 150:100:100 kg NPK ha-1 and basal application of 30 t ha-1 of farm yard manure could be recommended for higher yield, quality and profit. It also resulted in 24 percent increase in dry ginger yield over the conventional method of planting and nutrient application.