Effect of seaweed extracts on the yield, yield attributes ... . LEINDAH DEVI, Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, COIMBATORE (T.N.) INDIA Email: leindahnong@gmail.com

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<ul><li><p>An Asian Journal of Soil ScienceVolume 8 | Issue 2 | December, 2013 | 304-310</p><p>Effect of seaweed extracts on the yield, yieldattributes and juice quality of sugarcane in coastalregion of Tamil Nadu</p><p> N. LEINDAH DEVI AND S. MANI</p><p>HIND AGRICULTURAL RESEARCH AND TRAINING INSTITUTE</p><p>MEMBERS OF RESEARCH FORUM :</p><p>Received : 28.08.2013;Revised :24.09.2013; Accepted : 03.10.2013</p><p>SummaryThe experiment was conducted on sugarcane during 2012-13 to study the effects of foliar applications ofdifferent concentrations of seaweed extracts (prepared from Kappaphycus alvarezii and Glacilaria sp.) onyield, yield attributes and juice quality of sugarcane. The foliar spray was applied three times at 30, 75 and110 days after planting with 2.5%, 5%, 6.5%, 7.5% and 10% concentrations of both seaweed extracts.Foliar applications of seaweed extract significantly enhanced yield, yield attributes and juice quality. Thehighest yield was recorded with the applications of 10% seaweed extract Kappaphycus alvarezii (K sap),followed by 10% seaweed extract Glacilaria sp (G sap) that resulted in 19.54 % and 18.07 % increases,respectively compared to the control. Seaweed extract of Kappaphycus alvarezii was found slightly moreeffective than that of Gracilaria sap. The maximum yield, yield attributes and juice quality was also achievedwith 100 % NPK+10 % Kappaphycus alvarezii extract application. Thus, foliar applications of seaweedextracts could be a promising option for yield, yield attributes and juice quality enhancement of sugarcane.</p><p>Key words : Seaweed extract / sap, Kappaphycus alvarezii, Glacilaria sp., Sugarcane, Yield, Yield attributes,Juice quality</p><p>How to cite this article : Devi, N. Leindah and Mani, S. (2013). Effect of seaweed extracts on the yield,yield attributes and juice quality of sugarcane in coastal region of Tamil Nadu. Asian J. Soil Sci., 8(2): 304-310.</p><p>Research Article</p><p>Corresponding author :N. LEINDAH DEVI, Department ofSoil Science and AgriculturalChemistry, Tamil Nadu AgriculturalUniversity, COIMBATORE (T.N.) INDIAEmail: leindahnong@gmail.com</p><p>Co-authors :S. MANI, Department of Soil Scienceand Agricultural Chemistry, TamilNadu Agricultural University,COIMBATORE (T.N.) INDIA</p><p>IntroductionSugarcane (Saccharum hybrid complex) is an important</p><p>agro-industrial crop grown primarily for sugar production inIndia and plays a pivotal role in agricultural and industrialeconomy of the country. The productivity of sugarcane intropical belt is 29.96 % higher than that of sub-tropical belt,and this is primarily due to the ideal climatic conditions over alonger period for its growth. An increased plant populationdensity in the form of number of millable canes and individualcane weight per unit area and time are the most importantfactors deciding higher sugarcane yield.</p><p>Liquid extracts obtained from seaweeds have recentlygained importance as foliar sprays for many crops includingvarious grasses, cereals, flowers and vegetable species(Crouch and Van Staden, 1994). Seaweed extracts containsmajor and minor nutrients, amino acids, vitamins, cytokinins,</p><p>auxin and abscisic acid like growth promoting substances(Mooney and Van Staden, 1986) and have been reported tostimulate the growth and yield of plants (Rama Rao, 1991),develop tolerance to environment stress (Zhang and Schmidt,2000; Zhang et al., 2003), increase nutrient uptake from soil(Verkleij, 1992; Turan and Kose, 2004) and enhance antioxidantproperties (Verkleij, 1992). The beneficial effect of seaweedextract application is as a result of many components thatmay work synergistically at different concentrations, althoughthe mode of action still remains unknown (Fornes et al., 2002).Unlike, chemical fertilizers, extracts derived from seaweedsare biodegradable, non-toxic, non-polluting and non-hazardous to humans, animals and birds (Dhargalkar andPereira, 2005). Keeping this in view, with the abovebackground, the present investigation was carried out tostudy the effects of foliar applications of different</p></li><li><p>HIND AGRICULTURAL RESEARCH AND TRAINING INSTITUTE 305 Asian J. Soil Sci., (Dec., 2013) 8 (2) :</p><p>concentrations of seaweed extracts (prepared fromKappaphycus alvarezii and Glacilaria sp.) on yield, yieldattributes and juice quality of sugarcane.</p><p>Resource and Research MethodsPreparation of liquid seaweed extract and sett treatments :</p><p>The seaweed extract used in this study was obtainedfrom Kappaphycus alvarezii and Glacilaria sap red algaebelonging to the family Solieraceae. The seaweed liquidfertilizer was prepared with different doses viz., 2.5%; 5.0%;6.5%, 7.5% and 10%. The sugarcane variety COC (SC 24) wasused as test crop. Setts were soaked in particular seaweedsaps for 2-3 mins before planting and then setts were planted.</p><p>Experimental site :The field experiment was conducted during the year 2012-</p><p>13 at Sugarcane Research Station, TNAU, Cuddalore, TamilNadu. The experimental site is located at latitude 11.46NLongitude 79.48E and 4.6 m above mean sea level. Theexperimental field was sandy loam in texture with near to neutralpH (7.55) and non saline (EC: 0.16 dS m-1). The initial soilfertility status was 0.46% in organic carbon, 141 kg ha-1 in soilavailable N, 11.33 kg ha-1 in available P and 200 kg ha-1 inavailable K.</p><p>Experimental design and treatments :The experiment was laid out with twelve treatments in a</p><p>Randomized Block Design with three replications. Thefollowing treatments were included in the study.</p><p>Treatment details :T</p><p>1- Recommended dose of fertilizer (100% N,P,K)</p><p>(control), T2- recommended dose and water spray, T</p><p>3- 50%</p><p>recommended dose + 6.25% Kappaphycus alvarezii extract(K sap), T</p><p>4- recommended dose +2.5% K sap, T</p><p>5- recommended</p><p>dose +5.0%K sap, T6- recommended dose + 7.5% K sap, T</p><p>7-</p><p>recommended dose +10% K sap, T8- recommended dose +2.5%</p><p>(Glacilaria extract) G sap, T9- recommended dose +5.0% G</p><p>sap, T10</p><p>- recommended dose +7.5% G sap, T11</p><p>- recommendeddose +10% G sap, T</p><p>12- 50% recommended dose + 6.25% G sap.</p><p>The recommended dose of 300:100:200 kg N, P2O</p><p>5and</p><p>K2O ha-1 in the form of urea, SSP and MOP was used. The</p><p>entire doses SSP fertilizers were applied as basal and N and Kfertilizers applied in 3 splits. In addition, 37.5 kg ZnSO</p><p>4 and</p><p>100 kg FeSO4 were also applied as per crop production guide.</p><p>The seaweed sap extracts as per the treatment schedule wasgiven three times at 30, 75 and 110 days after planting.</p><p>Yield, yield attributes and juice quality :Treatment wise yield attributes parameters were recorded</p><p>at different growth stages. Cane juice analyses was carriedout immediately after harvesting and yield was calculated after</p><p>harvest.</p><p>Statistical analysis :Data were analysed using analysis of variance (ANOVA)</p><p>following randomized block design by using Agress Software.Differences were considered significant at 5% level ofprobability.</p><p>Research Findings and DiscussionThe findings of the present study as well as relevant</p><p>discussion have been presented under following heads :</p><p>Effect of seaweed extract on yield parameters of sugarcane :The chemical constituents of the of Kappaphycus</p><p>alvarezii extract (K sap) and Glacilaria sp. (G sap) extract arepresented in Table 1. The use of seaweed extract increased allthe growth parameters measured for sugarcane with 10% Ksap treatment being significantly better than all the treatments.In general, a gradual increase in plant height, cane girth wasobserved with increased in seaweed extract application.</p><p>Table 1 : Chemical properties of seaweed sapChemical properties of seaweedsap</p><p>Kappaphycusalvarezii</p><p>Gracilaria sp.</p><p>pH 6.75 4.79</p><p>EC (dS/m) 6.15 5.47</p><p>Organic carbon % 0.71 0.62</p><p>Total nitrogen % 0.103 0.038</p><p>Total phosphorus % 0.007 0.002</p><p>Total potassium % 11.099 5.968</p><p>Total calcium % 13.473 5.446</p><p>Total magnesium % 9.288 6.673</p><p>Cu (mg/g) 0.359 0.371</p><p>Zn (mg/g) 0.012 0.123</p><p>Mn (mg/g) 0.395 0.187</p><p>Fe (mg/g) 0.630 0.674</p><p>Effect of seaweed extract on germination count ofsugarcane:</p><p>The used of seaweed extract increased germinationcompared from the control plant. The germination count wasrecorded at 60 days after planting and it ranged from 29 to53% among Kappaphycus alvarezii (K sap) spray while inGlacilaria sp. (G sap) spray it ranged from 35 to 49 % (Table2). Highest germination count of 53% was recorded in T</p><p>7</p><p>(100% NPK+10% K sap) and minimum germination count wasrecorded as 29 % in T</p><p>3(50% NPK+6.25% K sap). This might</p><p>be due to the existence of plant growth regulators, i.e.,cytokinin, gibberellin, trace elements, vitamins, andmicroelements in the extract. Similar results were reported</p><p>N. LEINDAH DEVI AND S. MANI</p><p>304-310</p></li><li><p>HIND AGRICULTURAL RESEARCH AND TRAINING INSTITUTE 306 Asian J. Soil Sci., (Dec., 2013) 8 (2) :</p><p>presence of macro and micronutrients (Mooney and VanStaden, 1986; Blunden, 1991; Sridhar and Rengasamy, 2010).</p><p>Effect of seaweed sap on cane girth, millable cane, singlecane weight and number of internodes of sugarcane :</p><p>In sugarcane production, cane length, cane girth andnumber of millable canes assumes practical significance asthey are directly related to the productivity; and the numberof internodes in a cane is an indirect measure of growth ofcanes. It is an established fact that an increase in tilleringcapacity of sugarcane plant leads to the sizable increase inthe number of millable canes thus boosting the productivityof the sugarcane. Kappaphycus alvarezii (K sap) andGlacilaria sp. (G sap) at 10 % concentrations registered highervalues of cane girth, internodes length of millable cane, singlecane weight and number of internodes of millable cane butwere at par with 5.0 and 7.5% concentrations and weresignificantly superior over 2.5 % concentration. However, allthe K and G sap treatments showed their superiority in allstages over T</p><p>1 (RDF control), T</p><p>2 (RDF+ water spray) and T</p><p>3</p><p>(50% RDF + 6.25% K sap) shown in Table 4 which might bedue to seaweed extracts promoted the growth characteristicssuch as length of internodes. In comparision of to control theshoot growth was accelerated in presence of seaweed extractswhich could be achieved by higher tiller production, increaseduptake and utilization of plant nutrients efficiently. Similarfindings were observed by Natarajan (1998); Tamilselvan(2000) and Duraiswamy (1986). These results might beattributed to the beneficial effect of seaweed extracts containnaturally occurring supplying nutrients, plant growthhormones (auxins, cytokines and gibberellins) as well as otherplant bio stimulants; e.g. amino acids, vitamins that could</p><p>Table 2 : Effect of seaweed saps on cane germination countTreatments Germination count (%)</p><p>T1: RDF 30.83</p><p>T2: RDF + water spray 34.50</p><p>T3: 50% RDF + 6.25% K sap 29.17</p><p>T4: RDF +2.5% K sap 35.67</p><p>T5: RDF +5% K sap 38.33</p><p>T6: RDF +7.5% K sap 38.67</p><p>T7: RDF + 10% K sap 53.17</p><p>T8: RDF + 2.5% G sap 44.33</p><p>T9: RDF +5% G sap 45.33</p><p>T10: RDF + 7.5% G sap 48.00</p><p>T11: RDF +10% G sap 49.17</p><p>T12: 50% RDF + 6.25% G sap 29.96</p><p>by Mohan et al. (1994); Rajkumar and Subramanian (1999)and Murugalakshmikumari et al. (2002).</p><p>Effect of seaweed extract on plant height :The results presented in Table 3 showed that the height</p><p>of the plants had increased with the application of both thesaps over control. The data on plant height indicated thatthere were differences among the treatments. However, themaximum height was increased by 25.54% compared to controlat harvest. At all the stages of the plant growth maximumheight was recorded by T</p><p>7 (100 %NPK+K sap 10% spray) and</p><p>lowest was recorded in T3 (50% NPK+6.25% K sap) at all the</p><p>growth stages. The increased growth of these crops may bedue to the presence of growth promoting substances and</p><p>Table 3 : Effect of seaweed sap on plant height of sugarcane (cm)Treatments 60 DAP 120 DAP 180 DAP 240 DAP Harvest</p><p>T1: RDF 16.27 74.07 129.43 161.70 172.30</p><p>T2: RDF+ water spray 17.32 75.70 131.13 162.63 183.13</p><p>T3: 50% RDF+ 6.25% K sap 14.63 73.93 124.97 150.00 171.83</p><p>T4: RDF+2.5% K sap 19.80 79.50 134.60 173.40 189.63</p><p>T5: RDF+5% K sap 19.33 81.53 137.10 181.00 205.20</p><p>T6: RDF+7.5% K sap 19.27 87.13 142.51 185.27 219.70</p><p>T7: RDF+ 10% K sap 20.27 90.87 146.20 191.27 231.43</p><p>T8: RDF+ 2.5% G sap 19.63 80.40 134.68 165.27 189.00</p><p>T9: RDF+5% G sap 19.00 82.57 133.70 172.00 195.23</p><p>T10: RDF+ 7.5% G sap 18.37 83.80 138.87 173.00 217.20</p><p>T11: RDF+10% G sap 20.20 86.70 141.61 188.20 220.87</p><p>T12: 50% RDF+6.25% G sap 15.20 82.67 135.70 162.43 181.80</p><p>SEd 1.1468 1.4438 3.0791 4.7892 6.0278</p><p>C.D. (P=0.05) 2.3783 2.9943 6.3857 9.9323 12.5009</p><p>C.D. (P=0.01) 3.2326 4.0699 8.6795 13.5001 16.9914</p><p>CV % 7.69 2.17 2.78 3.41 3.73</p><p>EFFECT OF SEAWEED EXTRACTS ON THE YIELD, YIELD ATTRIBUTES &amp; JUICE QUALITY OF SUGARCANE</p><p>304-310</p></li><li><p>HIND AGRICULTURAL RESEARCH AND TRAINING INSTITUTE 307 Asian J. Soil Sci., (Dec., 2013) 8 (2) :</p><p>maintain photosynthetic rates, improve plant resistances,delay plant senescence and control cell division. The modeof action and extract physiological mechanism responsiblefor the beneficial effect of seaweed extracts on plants stillremains to be understood.</p><p>Effect of seaweed sap on yield attributes of sugarcane :Effect of seaweed sap on length of millable cane of sugarcane:</p><p>Length of millable cane was significantly differing in alltreatments (Table 2). Mean length of millable cane ranged from171.83 to 231.43 cm among K sap concentrations and 181.80 cm</p><p>to 220.87 cm among G sap concentrations and the maximumlength of millable cane (231.43 cm) being recorded by T</p><p>7(100%</p><p>NPK + K sap 10% spray) and the lowest length of millablecane was recorded in T</p><p>3 (50% RDF + 6.25% K sap) with values</p><p>of 171.83 cm at harvest. The present investigation results arein consonance with the observation of different seaweedextracts induced varying growth responses (Bhosle et al.,1975). It has been suggested that hormones like cyctokininspresnts in the seaweed extract may responsible for theirgrowth promoting activity (Blunden and Wildgoose, 1977;Stephan et al., 1985; Hong et al., 1995; Strik and Van Stadan</p><p>Table 4 : Effect of seaweed sap on cane girth of sugarcane (cm)Treatments 60 DAP 120 DAP 180 DAP 240 DAP Harvest</p><p>T1: RDF 2.60 2.9 3.13 3.27 3.60</p><p>T2: RDF+ water spray 2.63 2.9 3.27 3.43 3.70</p><p>T3: 50% RDF+ 6.25% K sap 2.53 2.8 3.03 3.10 3.33</p><p>T4: RDF+2.5% K sap 2.60 2.8 3.10 3.27 3.50</p><p>T5: RDF+5% K sap 2.67 3.0 3.20 3.40 3.70</p><p>T6: RDF+7.5% K sap 2.70 3.1 3.33 3.53 3.90</p><p>T7: RDF+ 10% K sap 2.97 3.4 3.60 3.83 4.10</p><p>T8: RDF+ 2.5% G sap 2.53 2.9 3.10 3.20 3.40</p><p>T9: RDF+5% G sap 2.70 3.0 3.07 3.33 3.60</p><p>T10: RDF+ 7.5% G sap 2.77 3.0 3.20 3.33 3.70</p><p>T11: RDF+10% G sap 2.90 3.3 3.40 3.63 3.90</p><p>T12: 50% RDF+6.25% G sap 2.50 3.0 3.00 3.17 3.40</p><p>SEd 0.1277 0.1277 0.0834 0.1391 0.1636</p><p>C.D. (P=0.05) 0.2649 0.2649 0.1729 0.2884 0.3392</p><p>C.D. (P=0.01) 0.3600 0.3600 0.2350 0.3920 0.4610</p><p>CV% 5.85 5.85 3.19 5.05 5.48</p><p>Table 5 : Effect of seaweed sap on sugarcane yield and yield parameters</p><p>TreatmentsInternodeslength (cm)</p><p>Single cane weight(kg)</p><p>No. of internodesYield(t ha-1)</p><p>% yield over control</p><p>T1: RDF 8.80 2.51 17 101.56 0</p><p>T2: RDF+ water spray 9.70 2.62 17 104.79 3.08</p><p>T3: 50% RDF+ 6.25% K sap 6.00 2.45 16 98.52 -3.08</p><p>T4: RDF+2.5% K sap 9.10 3.28 19...</p></li></ul>