scholarly journals EFFECTS OF MYCORRHIZAE, MEDIA AND CONTAINER TYPE ON THE GROWTH OF GREEN PEPPER AND LETTUCE TRANSPLANTS

HortScience ◽  
1991 ◽  
Vol 26 (6) ◽  
pp. 709B-709 ◽  
Author(s):  
Ray A. Watson ◽  
Katrine A. Stewart ◽  
Valentin Furlan
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Block Design ◽  
Dry Weight ◽  
The Other ◽  
Fresh Weight ◽  
Green Pepper ◽  
Shoot Dry Weight ◽  
Randomized Complete Block Design ◽  
Container Type

The effects of two mycorrhizal species (Glomus versiforme and Glomus intraradix) and a control on the growth of green pepper, Capsicum annuum, and lettuce, Lactuca sativa, seedlings have been evaluated using four types of growing media (Peatwool, Fafard bulk mix. Cornell mix and a compost based mix) and two types of containers, Cell Packs (125 cc volume) and Pro-Trays (65 cc volume) for green pepper and Cell Packs (125 cc volume) and Plug Flats (33 cc volume) for lettuce. The experiments were split plot randomized Complete block design with 6 blocks (lettuce) and 4 blocks (pepper). Seeds were sown directly into the containers of mycorrhizal inoculated media. All treatments received the same fertilizer regime. Cell volume had no significant effects on green pepper fresh weight, dry weight, stem diameter, leaf area or leaf number but the lettuce Cell Pack plants had significantly higher fresh and dry weights, more leaves and higher leaf area. The Fafard Bulk and the Compost mix gave significantly higher fresh and dry weights than did the other two media for both green pepper and lettuce. Mycorrhizal species did not influence plant growth with the exception of leaf area in green peppers and shoot dry weight in lettuce.

scholarly journals Comparison of an Antitranspirant Spray, a Polyacrylamide Gel, and Wind Protection on Early Growth of Muskmelon

HortScience ◽  
2006 ◽  
Vol 41 (2) ◽  
pp. 361-366 ◽  
Author(s):  
Laurie Hodges ◽  
Entin Daningsih ◽  
James R. Brandle
Keyword(s):  
Plant Growth ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Field Experiments ◽  
Block Design ◽  
Dry Weight ◽  
Early Growth ◽  
Polyacrylamide Gel ◽  
Fresh Weight ◽  
Area Index

Field experiments were conducted over 4 years to evaluate the effects of antitranspirant (Folicote, Aquatrol Inc., Paulsboro, N.J.) and polyacrylamide gel (SuperSorb, Aquatrol Inc., Paulsboro, N.J.) on early growth of transplanted muskmelon grown either protected by tree windbreaks or exposed to seasonal winds. A randomized complete block design (RCBD) with split plot arrangement was used with wind protection (sheltered and exposed) areas as the main treatment and use of an antitranspirant spray or gel dip as subtreatments. Based on destructive harvests in the field, treatments and subtreatments did not affect dry weight or leaf area index in the first 2 years. Specific contrasts, however, showed that gel application significantly increased fresh weight, dry weight, and leaf area index over that of the untreated transplants whereas the spray application tended to reduce these factors during the first 3 weeks after transplanting. Significant differences between gel and spray subtreatments disappeared by 5 weeks after transplanting. Shelterbelts ameliorated crop microclimate thereby enhancing plant growth. Significantly, wind velocity at canopy height was reduced 40% on average and soil temperatures were about 4% warmer in the sheltered plots compared to the exposed plots during the first 5 weeks post-transplant. Muskmelon plants in the sheltered areas grew significantly faster than the plants in the exposed areas in 2 of the 3 years reported, with the 3-year average fresh weight increased by 168% due to wind protection. Overall transplanting success and early growth were enhanced the most by wind protection, followed by the polyacrylamide gel root dip, and least by the antitranspirant foliar spray. We conclude that microclimate modification by wind speed reduction can increase early muskmelon plant growth more consistently than the use of polyacrylamide gel as a root dip at transplanting or the use of an antitranspirant spray. A polyacrylamide gel root dip generally will provide more benefit during early muskmelon growth than the use of an antitranspirant spray.

scholarly journals Polythene Mulch and Irrigation for Mitigation of Salinity Effects on Maize (Zea mays L.)

2017 ◽  
Vol 14 (2) ◽  
pp. 1-13 ◽  
Author(s):  
M U Sikder ◽  
M Asadul Haque ◽  
R Jodder ◽  
T Kumar ◽  
D Mondal
Keyword(s):  
Zea Mays ◽  
Block Design ◽  
Irrigation Treatment ◽  
Dry Weight ◽  
Rabi Season ◽  
Fresh Weight ◽  
Shoot Dry Weight ◽  
Randomized Complete Block Design ◽  
Initiation Stage ◽  
Hybrid Maize

A pot experiment was conducted at the net house of Patuakhali Science and Technology University during rabi season 2014-15 to estimate the contribution of polythene mulch and irrigation on reducing of salinity effect on maize (Zea  mays L.). The experiment was laid out in a three factors randomized complete block design with three replications. The factors were salinity (two levels: without and 5 dS/m salinity), mulch (two levels: without and with polythene mulch) and irrigation (three levels: 125, 250 and 500 ml water/irrigation). BARI hybrid maize-7 was the test crop. Every pot received the same amount of fertilizer nutrients. Crops were harvested at tassel initiation stage. Mulch increased soil temperature by 2 to 4.5°C (with average of 3.1°C) over without mulch. In without mulch condition, salinity reduced shoot fresh and dry, and root fresh and dry weight by 28.3, 10.3, 39.4 and 30.6%, respectively. In with mulch condition, however, these reductions were 1.0, 7.2, 12.3 and 12.1 %, respectively. Polythene mulch reduced salinity induced reduction of the above parameters by 96.5, 30.1, 68.8 and 60.5 %, respectively. Under 125, 250 and 500 ml water/irrigation treatment, salinity reduced shoot fresh weight by 14.2, 19.3 and 6.7 %, respectively; shoot dry weight by 15.4, 6.6 and 5.0 %, respectively; and root fresh weight by 27.5, 20 and 11.6 %, respectively. Thus, the effect of salinity in maize was gradually decreased with the increasing amounts of irrigation water. Soil salinity reduced phosphorus and increased sulphur content in maize plants.The Agriculturists 2016; 14(2) 01-13

scholarly journals Applications of plant growth promoting bacteria and Trichoderma spp. for controlling Orobanche crenata in faba bean

2020 ◽  
Vol 44 (1) ◽  
Author(s):  
Mahmoud Ahmed Touny El-Dabaa ◽  
Hassan Abd-El-Khair
Keyword(s):  
Plant Growth ◽  
Faba Bean ◽  
Growth Parameters ◽  
Dry Weight ◽  
Research Centre ◽  
Plant Growth Promoting Bacteria ◽  
Fresh Weight ◽  
Orobanche Crenata ◽  
Trichoderma Spp ◽  
Shoot Dry Weight

Abstract Background Orobanche crenata is an obligate root parasite belonging to Orbanchaceae. Broomrape causes great damage to the faba bean. Several attempts were applied for controlling parasitic weeds. So, the aim of this work is to study the application of Trichoderma spp. as well as three rhizobacteria species in comparison to herbicidal effect of Glyphosate (Glialka 48% WSC) for controlling broomrape infesting faba bean (Vicia faba). Materials and methods Three pot experiments were carried out in the greenhouse of the National Research Centre, Dokki, Giza, Egypt during two successive winter seasons. Trichoderma inocula were adjusted to 3.6 × 108 propagules/ml and the bacterium inocula were adjusted at 107–109 colony-forming unit (CFU)/ml. All treatments were applied, before 1 week of sowing, at rate of 50 ml per pot in experiments I and II, while 100 ml per pot in experiment III. Results Trichoderma spp. (T. harzianum, T. viride and T. vierns) as well as three rhizobacteria species (Pseudomonas fluorescens, Bacillus subtilis and Bacillus pumilus) enhanced the growth parameters in faba bean plants, i.e. shoot length, shoot fresh weight, shoot dry weight and leaf number in the first experiment when applied without O. crenata infection. In the second experiment, all bio-control could protect plants against O. crenata infection, where it had better juvenile number reduction, than glyphosate after 2 months of application. Both B. subtilis and B. pumilus had the highest reduction to juvenile fresh weight, while their effect was equal to herbicide for juvenile dry weight, respectively. The bio-control agents had high effects until the 4th month, but it was less than that of the herbicide. In experiment III, the bio-control agents could highly reduce the juvenile parameters after 2 months, as well as juvenile fresh weight and juvenile dry weight after 4 months, than the herbicide, respectively. The bio-control agents were effective until 6 months, but less than the herbicide effect. All bio-control treatments highly increased the plant growth parameters, than the herbicide. Conclusion The application of Trichoderma spp. as well as rhizobacteria species could play an important role in controlling broomrape in faba bean as a natural bioherbicide.

Effect of nitrogen fertilizer on growth and yield of semi-dwarf and tall varieties of winter wheat

1978 ◽  
Vol 91 (1) ◽  
pp. 31-45 ◽  
Author(s):  
I. Pearman ◽  
S. M. Thomas ◽  
G. N. Thorne
Keyword(s):  
Winter Wheat ◽  
Grain Yield ◽  
Leaf Area ◽  
Dry Weight ◽  
The Other ◽  
Growth And Yield ◽  
Shoot Dry Weight ◽  
Phosphorus And Potassium ◽  
Main Effects ◽  
Dwarf Variety

SummaryEight amounts of nitrogen ranging from 0 to 210 kg N/ha were applied to two tall and one semi-dwarf variety of winter wheat in the spring of 1975 and 1976. The tall varieties were Cappelle-Desprez and Maris Huntsman; the semi-dwarf variety was Maris Fundin in 1975 and Hobbit in 1976. Interactions between varieties and nitrogen were few and small compared with the main effects. All varieties produced their maximum grain yields with 180 kg N/ha. The yield of the semi-dwarf varieties, but not the others, decreased slightly with more nitrogen.Cappelle-Desprez yielded less grain than the other varieties in both years. In 1975 the yields of Maris Fundin and Maris Huntsman were similar and in 1976 Hobbit yielded more than Maris Huntsman. The varieties had similar numbers of ears at maturity and similar patterns of tillering. The semi-dwarf varieties had most grains per spikelet, and hence grains per ear, and Cappelle-Desprez had least. The semi-dwarf varieties had the smallest grains. The semi-dwarf varieties had less straw than the other varieties and hence the largest ratios of grain to total above-ground dry weight. The decrease in dry weight of stem and leaves between anthesis and maturity was similar for all varieties. In 1975 the efficiency of the top two leaves plus top internode in producing grain was the same for all varieties, but in 1976 Hobbit was more efficient than the other two. There were some small differences between varieties in nutrient uptake that were not related to differences in growth. Maris Fundin tended to have a greater phosphorus and potassium content than the tall varieties. Hobbit contained slightly less nitrogen than the tall varieties at maturity, and had a smaller concentration of nitrogen in the grain.Applying 210 kg N/ha doubled grain yield in 1975. Applying nitrogen resulted in a largeincrease in number of ears and a small increase in number of grains per ear due to the development of more fertile spikelets per ear. Nitrogen decreased dry weight per grain, especially of the semi-dwarf varieties. With extra nitrogen, straw dry weight at maturity, shoot dry weight atanthesis and leaf area were all increased relatively more than grain yield, and stems lost moredry weight between anthesis and maturity than without nitrogen. The year 1976 was exceptionallydry and nitrogen had only small effects in that it affected neither straw dry weight nor numberof ears but slightly increased grain yield by increasing the number of spikelets and number of grains per spikelet. It also increased leaf area proportionately to grain yield. In 1975 nitrogen increased evaporation of water from the crop before anthesis but decreased it after anthesis, even though it continued to increase the extraction of water from below 90 cm.

scholarly journals VEGETATIVE GROWTH OF VEGETABLE AMARANTH AS AFFECTED BY NITROGEN FERTILIZATION

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 733c-733
Author(s):  
Wayne F. Whitehead ◽  
Bharat P. Singh
Keyword(s):  
Leaf Area ◽  
Block Design ◽  
N Fertilization ◽  
Optimum Level ◽  
Fresh Weight ◽  
Amaranthus Tricolor ◽  
Randomized Complete Block Design ◽  
Significant Regression ◽  
N Rates ◽  
Successful Production

Influences of nitrogen (N) rate were evaluated on vegetable amaranth. Amaranthus tricolor, grown at uniform populations over two year. The main objective was to determine an optimum level of N fertilization for successful production in middle Georgia. In 1992 and 1993 accession `RRC 241' was planted in randomized complete block design on June 19 and 23, respectively. Four N rates, equally split were evaluated: 0, 45, 90, and 135 kg ha-1. First of the applications were 18 and 13 days post planting for 1992 and 1993, and again when plants were 5 weeks old. Plants were harvested 48 days after planting with green yield, leaf fresh weight. and stem fresh weight collected in both years and leaf area for 1993. In years 1992 and 1993 green yields were 5.3 and 6.5, 10.7 and 9.0. 13.2 and 12.1, and 13.5 and 14.0 Mg ha-1. respectively for the 0, 45, 90, and 135 rates. In both years vegetative components showed significant regression for all treatments. Vegetative response (R2) for green yield in 1992 and 1993 was quadratic (85%) and linear (73%), leaf fresh weight in both years was cubic (63% and 48%), while stem fresh weight response was linear (29%) and cubic (72%). During 1993 leaf area was linear (58%). Non-significance predominantly occurred between the two higher rates for each year and when combined. indicating that 90 kg N ha-1 should provide optimal production of amaranth for the middle Georgia region.

scholarly journals Respon Pertumbuhan Bibit Salak (Salacca Zallaca) terhadap Dosis Spora Endomikoriza pada Media Pembawa Pasir Kuarsa dan Zeolit

2020 ◽  
Vol 10 (1) ◽  
pp. 18
Author(s):  
NI KADEK ARYANI ◽  
I NYOMAN RAI ◽  
NI NYOMAN ARI MAYADEWI
Keyword(s):  
Leaf Area ◽  
Quartz Sand ◽  
Block Design ◽  
Dry Weight ◽  
Nutrient Content ◽  
Root Infection ◽  
Shoot Dry Weight ◽  
Randomized Block Design ◽  
Total Dry Weight ◽  
Leaf P

Response of Salak Seedlings (Salacca Zallaca) Growth to Dosage of Endomycorrhizal Spore in Quartz Sand and Zeolite Carrier Media. This study aimed to study the effect of endomycorrhizal spore dosage and carrier media that were applied directly to the roots of salak plants. The research designed as factorisl by using Randomized Block Design with 2 treatment factors. The first factor was number of endomycorrhiza spores consists of 4 levels i.e 0, 75, 150, and 225 spores per 500 g carrier media per polybag, while the second factor was the type of carrier media consist of 2 levels i.e zeolite and quartz sand. The results showed that interaction between endomycorrhizal spore dosage with   carrier   media   did   not   significantly   influence   the   growth   of   salak   seedlings. Endomycorrhizal spores in doses of 75, 150 and 225 spores per polybag increased root infection and leaf P nutrient content compared to control, but seed height, leaf area, shoot dry weight, root dry weight and total dry weight of seedlings not significantly difference. The zeolite carrier media caused root infection by mycorrhizal was higher than quartz sand media, but the P nutrient uptake and seedling growth were not significantly different. Based on the results of this study it is necessary to make a longer observation of the effect of endomycorrhizal spore doses and carrier media on the growth of salak seedlings.

scholarly journals Aplikasi Kompos Gulma Siam Chromolaena odorata terhadap Sifat Kimia Tanah dan Performa Tanaman Cabai

SoilREns ◽  
2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Vira Kusuma Dewi ◽  
Nugoho Susetyo Putra ◽  
Benito Purwanto ◽  
Sri Hartati ◽  
Santika Sari
Keyword(s):  
Block Design ◽  
Dry Weight ◽  
The Other ◽  
Plant Performance ◽  
High Biomass ◽  
Chromolaena Odorata ◽  
Fresh Weight ◽  
Randomized Block Design ◽  
Two Factors ◽  
Positive Effect

Chromolaena odorata (L.) is a potential compost since it has high biomass and contains calcium, manganese, potassium and nitrogen. The aim of this research was to know the potency of siam weed Chromolaena odorata compost on soil chemical and chili plant performance. The experiment was arranged in factorial randomized block design consisted of two factors and three replications. The first factor was variety of fertilizer (no fertilizer, cow manure, siam weed compost and inorganic fertilizers) and the second one was the tanglefoot (with and without tanglefoot). Overall, the results of study showed that C. odorata compost could increased crop performance when compared with the other fertilizers in terms of number of fruits, fresh/dry weight of fruits, dry weight of crops, and N-total (leaf, stem, root and fruit), though there was no difference in fresh weight of crops among treatments. Furthermore, the effect of siam weed compost was not significantly different on soil chemical if compared with all treatments. This study is likely suggesting that C. odorata compost gives a positive effect to crops performance and soil chemicals.Keywords:  Chili, Chromolaena odorata, compost  fertilizer, tanglefoot

scholarly journals PENGARUH PUPUK ORGANIK CAIR NASA TERHADAP PERTUMBUHAN BIBIT TANAMAN JATI PUTIH (Gmelina arborea Roxb)

AGRICA ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 10-22
Author(s):  
Josina Irene Brigetha Hutubessy
Keyword(s):  
Leaf Area ◽  
Block Design ◽  
Organic Fertilizer ◽  
Dry Weight ◽  
Fresh Weight ◽  
Plant Seed ◽  
Optimum Dosage ◽  
Randomized Block Design ◽  
Seed Growth ◽  
Number Of Leaves

This research aims to determine the effect of concentration of organic fertilizer Super NASA to the growth of seeds of white teak and to know the optimum dosage of organic fertilizer Super NASA can increase the growth of NASA plant seed white teak. The design used in this study was a Randomized Block Design with the treatment used is N0: without fertilizer Super NASA NASA, N1: Fertilizer NASA7 .5 ml seeds-1, N2: Fertilizer NASA 15 ml seeds-1, N3: Fertilizer NASA 22.5 ml seeds-1, N4: Fertilizer NASA 30 ml seeds-1. Variable observation in this study is the height of the plant, number of leaves, leaf area, fresh weight tan-1, fresh and dry weight oven tan-1. The results showed that the granting of Fertilizer NASA exerted a highly significant effect on the height of plant (23,65%), the number of leaves is not significant, leaf area (53,61%), fresh weight tan-1 (60,89%) and dry weight tan-1 (55,43%). The optimum dosage of Fertilizers NASA give the seed growth of white teak is best on the seed-1is 30 ml.

scholarly journals Pengaruh Aplikasi Biostimulant terhadap Pertumbuhan dan Produksi Selada (Lactuca sativa L.)

2020 ◽  
Vol 16 (2) ◽  
pp. 109-117
Author(s):  
Primarine R Tahapary ◽  
Herman Rehatta ◽  
Henry Kesaulya
Keyword(s):  
Vitamin E ◽  
Plant Growth ◽  
Vitamin C ◽  
Leaf Area ◽  
Root Length ◽  
Block Design ◽  
Growth And Yield ◽  
Leaf Number ◽  
Root Number ◽  
Fresh Weight

Lettuce is a type of vegetable that is very popular with the people of Indonesia. It contains healthy nutrients including minerals, vitamins, antioxidants, potassium, iron, folate, carotene, vitamin C and vitamin E. Biostimulants has the ability to stimulate new root formation, improve plant root systems, increase the number of tillers, and increase yield. Biostimulant concentration and site of administration play a role in providing nutrients for the needs of lettuce plants. To obtain the right concentration and place of administration for the growth and yield of lettuce, the experiment was carried out using a 2-factor Randomized Block Design. The first factor was the concentration of biostimulants (K) with 6 levels of concentration including: K0 (without giving biostimulants), K1 (giving biostimulants at a concentration of 1 mL/L of water), K2 (giving of biostimulants at 2 mL/L of water), K3 (giving biostimulants at 3 mL/L of water). K4 (giving biostimulant at 4 mL/L water), K5 (giving biostimulant at 5 mL/L water). The second factor was the site of administration (T), namely: T1 (through the leaves) and T2 (through the soil). The interaction between biostimulant concentration and administration gave a very significant effect on leaf number, crop fresh weight, root length and root number. Biostimulant concentration (K) gave the percentage of plant growth in the variables of plant height (34.29%) and leaf area (47.34%). Place of administration (T) gave percentage of plant growth the variables of leaf area (21.08%) and root wet weight (0.52%). The interaction of biostimulant concentration and administration place (K x T) gave the percentages of plant growth variables of leaf number (15.5%), plant fresh weight (52.33%), root dry weight (2.30%), root length (16.53%), and root number (108.5%). The best treatment in this study was the provision of biostimulant at a concentration of 2 mL/L of water that was given through leaves. Keywords: administration place, biostimulant, concentration, growth and production, lettuce   ABSTRAK Selada merupakan jenis sayur yang sangat digemari oleh masyarakat Indonesia serta mengandung nutrisi yang sehat, yang meliputi mineral, vitamin, antioksidan, potassium, zat besi, folat, karoten, vitamin C dan vitamin E. Biostimulan mampu merangsang pembentukan akar baru, memperbaiki sistem perakaran tanaman, memperbanyak jumlah anakan, dan meningkatkan produksi tanaman. Konsentrasi biostimulan dan tempat pemberian merupakan interaksi yang berperan dalam menyediakan unsur hara bagi kebutuhan tanaman selada. Untuk memproleh konsentrasi dan tempat pemberian yang tepat bagi pertumbuhan dan produksi tanaman selada, dilakukan percobaan dengan menggunakan Rancangan Acak Kelompok 2 faktor. Faktor pertama adalah pemberian biostimulan (K) dengan 6 taraf konsentrasi meliputi: K0 (tanpa pemberian biostimulan), K1 (pemberian biostimulan dengan konsentrasi 1 mL/L air), K2 (pemberian biostimulan 2 mL/L air), K3 (pemberian biostimulan 3 mL/L air), K4 (pemberian biostimulan 4 mL/L air), K5 (pemberian biostimulan 5 mL/L air). Faktor kedua adalah tempat pemberian (T), yaitu: T1 (melalui daun) dan T2 (melalui tanah). Interaksi konsentrasi biostimulan berpengaruh sangat nyata terhadap variabel jumlah daun (helai), bobot segar tanaman (g), panjang akar (cm) dan jumlah akar (helai). Pada konsentrasi biostimulan (K) memberikan persentasepertumbuhan tanaman pada variabel tinggi tanaman (34,29%) dan luas daun (47,34%), Tempat pemberian (T) memberikan persentasepertumbuhan tanaman pada variabel luas daun (21,08%), bobot basah akar (0,52%), serta interaksi konsentrasi biostimulan dan tempat pemberian (KT) memberikan persentasepertumbuhan tanaman pada variabel jumlah daun (15,5%), bobot segar tanaman (52,33%), bobot kering akar (2,30%), panjang akar (16,53%), serta jumlah akar (108,5%). Perlakuan terbaik dalam penelitian ini adalah pemberian biostimulan konsentrasi 2 mL/L air dan diberikan melalui daun. Kata Kunci: biostimulan, konsentrasi, pertumbuhan dan produksi, selada, tempat pemberian,

scholarly journals Gibberellic Acid Application and Plant Spacing Effects on Growth and Yield of Lettuce (Lactuca sativa L.)

2020 ◽  
pp. 1-13
Author(s):  
Taslima Akter ◽  
Md. Nazrul Islam ◽  
Md. Jahedur Rahman ◽  
Rebaka Sultana ◽  
Chaity Dey Puja ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Leaf Area ◽  
Block Design ◽  
Dry Weight ◽  
Growth And Yield ◽  
Cost Ratio ◽  
Plant Spacing ◽  
Fresh Weight ◽  
Optimum Spacing ◽  
Number Of Leaves

Aims: This study aimed to optimize the levels of gibberellic acid (GA3) and plant spacing on growth and yield of lettuce. Study Design: The experiment was laid out in Randomized Complete Block Design with three replications. Place and Duration of Study: Horticulture farm of Sher-e-Bangla Agricultural University, Dhaka-1207, from November 2013 to January 2014. Methodology: The experiment consisted of two factors. Factor A- two levels of gibberellic acid (GA3,) application, viz. G1= 25 ppm and G2= 50 ppm in relation to a control G0 and factor B- four plant spacing viz. S1=15cm x 15cm, S2=20 cm x 20 cm, S3=25 cm x 25 cm and S4=30 cm x 30 cm. GA3 was applied twice as a foliar application by hand sprayer at 20 and 30 days after sowing. First, second and final harvesting was done at 25, 35 and 45 days after sowing respectively. Results: The growth and yield characters of lettuce showed significant variation for different levels of GA3 and plant spacing. Among GA3 levels, 25 ppm GA3 produced the maximum number of leaves (15.6), leaf area (283.9 cm2), fresh weight (91.6 g plant-1), dry weight (11.8 g plant-1), fresh yield (1794 g plot-1) and gross yield (12 t ha-1) at final harvesting compared to control where GA3 was not used. Under plant spacing, highest plant height (17.5 cm), leaf area (281.1 cm2), fresh weight (99.1 g plant-1) and dry weight (12.1 g plant-1) was revealed from wider spacing 30 cm x 30 cm followed by optimum spacing 25cm x 25cm. Meanwhile, closure spacing 15 cm x 15 cm showed maximum fresh yield (1710 g plant-1) and gross yield (15.5 t ha-1) due to higher plant density at final harvesting. Besides, lower chlorophyll content (0.43%) and the highest number of leaves (16.2) was found from 25 cm x 25 cm at final harvesting. So, optimum spacing 25 cm x 25 cm would be more suitable considering different points of view. Moreover, the treatment combinations 25 ppm GA3 with 25 cm x 25 cm exhibited highest benefit-cost ratio (2.04) than other treatments. Conclusions: It is concluded that the combinations 25 ppm GA3 application with 25cm x 25cm spacing would be optimum for better growth and yield of lettuce

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