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Effect of Organic Based Liquid Fertilizers on Growth Performance of Leaf Lettuce (Lactuca Sativa L.)

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Effect of Organic Based Liquid Fertilizers on Growth Performance of Leaf Lettuce (Lactuca Sativa L.) International Conference on Agricultural, Ecological and Medical Sciences (AEMS-2015) April 7-8, 2015 Phuket (Thailand) Effect of Organic Based Liquid Fertilizers on Growth Performance of Leaf Lettuce (Lactuca Sativa L.) P. U. S. Peiris1, and W.A.P. Weerakkody2 Abstract---The best quality lettuce is assured by adequate eventhough there is an increasing consumer demand for fertilizing, steady supply of water and cool temperature. Most of the organically produced foods because of possible human health farmers are using inorganic fertilizers for lettuce in open fields and in hazards due to over usage and environmental degradation hydroponics. However, there is an increasing demand for organically caused by inorganic fertilizers [1]. produced fruits and vegetables. Therefore, the present study was conducted to study the plant growth in terms of fresh weight (FW, g/ Therefore, it is paramount important to evaluate the plant), dry weight (DW, g/plant), total leaf area (LA, cm2/plant), performance of lettuce in response to organic liquid fertilizers. maximum root length (RL, cm), specific leaf weight (SLW, g/cm2) Compost tea is a liquid extract of compost consisting with and number of leaves at harvest (NL) in leaf lettuce of variety ‘Grand essential plant nutrients and beneficial microorganisms which Rapid’ in three different organic based liquid fertilizers. The highest recycles organic matter. Compost tea also boosts the plant and FW was observed in T3 (Glliricidia leaf extract) where the average soil enhancing activity of soil life. Compost tea has been used EC and average pH were maintained at 0.43 dS/m and 5.85, as a fertilizer, pesticide and fungicide [2]. respectively throughout the growing period. The highest NL and LA Poultry manure is a strong liquid manure. Poultry manure in were also found in T3, resulting a higher production of photosynthetic particular is a rich source of phosphorus and nitrogen, both of tissues; where the lowest NL and LA were observed in T1 (Compost tea liquid). The highest DW, partitioned to leaves (LDW) and roots which are vital building blocks for plant proteins and thus (RDW) were recorded in T3. T1 and T2 (Poultry manure liquid) contributive to plant growth [3]. showed significantly lower dry matter partition to leaves and roots The foliage of Gliricidia sepium is higher in its nutritional eventhough the highest EC (0.77dS/m) during the study period was composition. Numbers of researches have been conducted on recorded in T . Although EC is an indirect indication of the strength 2 the antifungal and antimicrobial properties of gliricidia of nutrient solution, T2 did not show significant yield advantage due to some reason. The SLW, was not significantly different. The highest extracts, proving its ability to inhibit the growth of some RL was also found in T3; owing to its higher dry matter partitioning. fungi, bacteria and nematodes [4]. But, the highest growth of root hairs was observed in T1; which Therefore, the objective of this study was to investigate the encourages nutrient absorption for plant survival, even at low EC effect of organic based liquid fertilizers on the vegetative levels. The study revealed that Glliricidia leaf extract as the most growth of leaf lettuce (Lactuca sativa L.) favourable organic based liquid fertilizer for best growth performance of leaf lettuce while Compost tea liquid was the lowest. Poultry manure was an intermediate performer in case of vegetative growth II. MATERIALS AND METHODS in leaf lettuce. Site Description Keywords---Leaf Lettuce, Organic fertilizer, Plant growth The study was carried out in the protected house of Uva performance Wellassa University, Badulla (IM 1a) during July to October 2014. The location is at 680m above sea level. I. INTRODUCTION TABLE I ETTUCE (Lactuca sativa L.) belongs to the family WEATHER DATA FOR THE STUDY PERIOD o Compositae which is one of the most important Month Day temperature C Average rainfall L Maximum Minimum mm vegetable crops in the world. It is cultivated mainly in July 30 25 24 up country of Sri Lanka in open fields as well as under green August 30 25 99 house conditions. Simple hydroponics like trough culture and September 30 25 142 aggregate system are much used in growing lettuce. 1 (Source: http://www.accuweather.com) The best quality lettuce is assured by adequate fertilizing, Mean day temperature of mid day under protected house steady supply of water and cool temperature. Albert solution was 38.5oC, measured daily with thermometers. and other inorganic fertilizers are heavily used in lettuce Plant Description 1 P.U.S Peiris (Corresponding author), Faculty of Livestock, Fisheries and Seeds of lettuce variety ‘Grand rapid’ were used as the Nutrition, Wayamba University of Sri Lanka, Makandura, Sri Lanka Email id planting material. Three treatments (TRT) were used for the :- [email protected], Ph. +94779486813 experiment, namely; Compost tea solution (T1), Poultry 2 W. A. P Weerakkody, Department of Crop Science, Faculty of Agriculture, manure liquid (T2) and Glliricidia leaf extract (T3). Three University of Peradeniya, Sri lanka http://dx.doi.org/10.15242/IICBE.C0415010 39 International Conference on Agricultural, Ecological and Medical Sciences (AEMS-2015) April 7-8, 2015 Phuket (Thailand) plants (03 replicates) per each treatment were used for data Note: EC and pH were measured after mixing respective volume of fertilizer collection. Complete Randomized Design (CRD) was used. solutions in 200 mL of H2O Seeds were sown in nursery medium of coir dust in seedling Climatic Parameters under Protected House Data trays and two week old lettuce seedlings were transplanted to Analysis poly bags filled with a medium of coir dust. Bags were placed Results were analyzed by one-way ANOVA using Minitab at 8 cm distance in protected house. 15 statistical package. Comparisons were made between mean The fertilizer application was started three days after values of morphological parameters using Tukey method. transplanting. Compost tea solution and Poultry manure liquid were prepared one week prior to each application. Glliricidia leaf extract was prepared just before each application. III. RESULTS AND DISCUSSION Effect of Light Levels on Physiological Parameters Preparation of fertilizer solutions The effect of organic liquid fertilizers on the average fresh In case of compost tea, 800g of commercially available weight of leaves (LFW) and roots (RFW), average dry weight compost was placed in a water container having 4 L using a of leaves (LDW) and roots (RDW), average maximum root cotton cloth sack, 01 week prior to application. Tea-bag (the length (RL) and average leaf area (LA) of lettuce grown in sac) was securely tightened and immersed in water. Liquid grow bags (hydroponics) were statistically significant (Table was aerated by manual agitation twice a day. In case of IV). poultry manure extract, 800g of dried poultry manure was Mean LFW at T was significantly higher than T and T . placed in a water container having 4 L and the fertilizer liquid 3 1 2 was prepared in the same manner as in case of compost tea This is due to higher number of leaves and larger leaf area per liquid. Glliricidia leaves were collected from the plants grown plant observed in T3 at harvest (Figure 1 and Figure 2); where naturally. Leaves were ground while mixing 1 L of water to the average electrical conductivity (EC) and average pH were 100 g of leaves to form the Glliricedia leaf extract [5]. maintained at 0.43 dS/m and 5.85, respectively throughout the Properly, filtered solutions were applied for plants once in growing period. two days. Application the amount applied was varied EC is an indirect indication of the strength of the nutrient depending on the desirable EC values to be maintained in the (hydroponic) solution. Higher EC more than 2.5 dS/m; hinders hydroponics solutions (Table. II) nutrient absorption due to increase in osmotic pressure TABLE II whereas lower EC may severely affects the plant health and APPLICATION AMOUNT OF FERTILIZER SOLUTIONS (ML) yield [6]. The latter may be the reason for the significant Fertilizer 1st – 5th 6th – 10th 11th –15th 16th – 20th reduction of fresh weight of lettuce in T1 where EC was much application application application application lower compared to T3 (Table 2). Eventhough EC was higher in T2 compared to T3 and lesser than 2.5dS/m, there was no Compost tea 40 50 60 70 significant yield increase because higher EC creates higher (T1) Poultry nutrient concentration of the solution which may lead to 40 50 60 70 manure (T2) toxicities in plant nutrition [7]. Gliricidia leaf TABLE IV 40 50 60 70 extract (T3) MEAN VALUES OF LFW (G/PLANT), RFW (G/PLANT), LDW (G/PLANT), RDW 2 Note: Each amount was applied to individual poly bags with 200mL of H2O (G/PLANT) , RL (CM), LA (CM ) FOR LEAVES UNDER DIFFERENT ORGANIC LIQUID FERTILIZERS Dry Weight and Leaf Area Measurements LFW LDW RFW RDW RL LA During the first week of October 2014, the plants were separated in to roots and leaves and fresh weights at harvest c b c bc c c were obtained. Number of new leaves, developed after the T1 33.13 0.87 1.68 0.23 9.13 580.43 treatments was counted. Root length of each plant at harvest b ab b ab b b was recorded. Then the samples were separately oven dried T2 41.5 1.10 1.77 0.24 10.00 685.53 and dry weights after harvesting were recorded. a a a a a a T3 45.4 1.27 1.92 0.26 10.83 725.87 EC and pH of fertilizer solutions For each variable, means followed by the same letter are not significantly different at p=0.05 level EC and pH of fertilizer solutions were measured prior to Mean LDW at T , T and T were not significantly application and pH was maintained in the range of 5.5 - 6.5 by 1 2 3 different from each other (Table 1).
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