scholarly journals The Effect of NPK Doses and Plant Spacing on Lettuce (Lactuca sativa L.) Growth and Production

2020 ◽  
Vol 5 (2) ◽  
pp. 102-106
Author(s):  
R. Rahmawati
Keyword(s):  
Lactuca Sativa ◽  
Block Design ◽  
Plant Spacing ◽  
Fresh Weight ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Lettuce Growth ◽  
The Impact

The aim of this study was to determine the impact of NPK doses and proper plant spacing in lettuce growth and production. The experiment was conducted in Wirimpalennae Village, Tempe Subdistrict, Wajo Regency from January to March 2017. The experiment employed randomized block design with 2 factor factorial namely NPK doses (300 kg/ha, 350 kg/ha, 400 kg/ha and plant spacing (20 x 25 cm, 25 x 25 cm, 25 x 40 cm). The result showed that the interaction between NPK doses and plant spacing were significantly influenced the fresh weight of lettuce. The highest yield of lettuce was 2,16 kg/Ha (12 t/Ha) produced by the combination of NPK dose (350 kg/ha) and plant spacing (25 x 25). The interaction of NPK dose and plant spacing treatments were not significantly influenced others parameters

scholarly journals Respons Pertumbuhan Dan Produksi Dua Varietas Selada (Lactuca Sativa L.) Terhadap Pemberian Berbagai Sumber Nitrogen

1970 ◽  
Vol 5 (2) ◽  
pp. 177-182
Author(s):  
Jepriwira K. Ginting ◽  
Jonis Ginting ◽  
Nini Rahmawati
Keyword(s):  
Plant Height ◽  
Lactuca Sativa ◽  
Block Design ◽  
Organic Fertilizer ◽  
Chicken Manure ◽  
Fresh Weight ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Sample Application ◽  
Number Of Leaves

The research aims to determine the growth and production response of two varieties of lettuce (Lactuca sativa L.) to the provision of various sources of nitrogen. This research was conducted in Lambar village, Tigapanah sub-district, Karo regency, Sumatera Utara Province with altitude of ± 1200 meters above sea level, which started on July to September 2017. This research used a factorial randomized block design with 2 factors namely varieties of lettuce (crop and lettuce) and sources of nitrogen (urea fertilizer, chicken manure and Liquid organic fertilizer of rabbit urine). The parameters observed were plant height, greenish leaves, crop circle, fresh weight of plant per sample and fresh weight of plant per plot. The results showed that both varieties were significantly different in the parameters of plant height, greenish leaves, the number of leaves, and the fresh weight of the plant per sample. Application of nitrogen source showed differences in plant height at 10 weeks after move planting and fresh weight of plant per sample.

scholarly journals Efektivitas Nilai EC (Elektrical Conductivity) Terhadap Produksi Selada Merah (Lactuca sativa L.) Varietas Red Rapid Pada Sistem Hidroponik Rakit Apung.

2020 ◽  
Vol 8 (1) ◽  
pp. 1
Author(s):  
Rommy Andhika Laksono
Keyword(s):  
Electrical Conductivity ◽  
Lactuca Sativa ◽  
Block Design ◽  
Fresh Weight ◽  
Hydroponic System ◽  
Floating Raft ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Number Of Leaves ◽  
Average Plant

This study aims to determine the effect of EC value (Electrical Conductivity) which is able to provide the best production of Red Lettuce (Lactuca sativa L.) Red Rapid Variety on the Floating Raft Hydroponic System. The experiment was conducted in a green house located in Sukaluyu Village, Telukjambe Timur District, Karawang Regency, from October to December 2016. The study used a randomized block design, consisting of 4 treatments, repeated 6 times, namely A (EC 0.5 - 1.5 mS / cm), B (EC 1.5 - 2.5 mS / cm), C (EC 2 , 5 - 3,5 mS / cm), D (EC 3,5 - 4,5 mS / cm) Data were analyzed using analysis of variance and further tests with Duncans multiple range test at 5% level. The number of plants for each treatment plot was 6 plants. The experimental results show that different EC (Electrical Conductivity) values have significantly different effects on the average plant height, 7, 14, 21, 28, 35 and 42 HST, the average number of leaves 21, 28, 35 and 42 HST , average stem diameter 7, 14, 21, 28, 35 and 42 days, average leaf area per plant, and average fresh weight per plant. The EC value of 3.5 - 4.5 mS / cm gives the highest production on the average fresh weight per lettuce plant (158.66 g), equivalent to 31.73 tons / ha. 

scholarly journals Kepadatan Bakteri Total Dan Azotobacter sp Di Rizosfer Selada (Lactuca sativa L.) Setelah Aplikasi Kasing Dan Pupuk NPK

Agrologia ◽  
2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Maya Damayani ◽  
Reginawanti Hindersah ◽  
Yusuf Rahman
Keyword(s):  
Lactuca Sativa ◽  
Block Design ◽  
Fertilizer Application ◽  
Fresh Weight ◽  
Inorganic Fertilizers ◽  
Lactuca Sativa L ◽  
Randomized Complete Block Design ◽  
Lettuce Growth ◽  
Npk Fertilizer ◽  
Poor Soil

Organic matter and inorganic fertilizer application are important to maintain the existence of potential microbes in the rhizosphere and maintain the soil quality. A greenhouse experiment has been carried out to determine the effect of  vermicompost and NPK fertilizer on total bacterial and Azotobacter  population in rhizosphere and yield of lettuce (Lactuca sativa L.) grown in soil order of  Inceptisols. The experimental design was a factorial randomized complete block design with three replicates were tested three doses of vermicompost (7.5, 15 and 22.5 t ha-1) and four doses of inorganic fertilizers; NPK (300; 450; 600 and 750 kg ha-1). The results showed that there was no significant interaction between vermicompost and NPK fertilizer on either total bacterial or Azotobacter population, as well as on fresh weight of lettuce. Both vermicompost and NPK fertilizer did not affect the biological parameters. However, the application of 750 kg/ha NPK fertilizer can increased lettuce weight up to 24% compared to that of control. This study suggested that in the relatively poor soil nutrients, lettuce growth was depend on inorganic fertilizers.

scholarly journals Pengaruh Konsentrasi Pupuk Hayati Bioboost Terhadap Peningkatan Produksi Tanaman Selada (Lactuca sativa. L)

Agrologia ◽  
2018 ◽  
Vol 3 (1) ◽  
Author(s):  
A. P Manuhuttu ◽  
Herman Rehatta ◽  
J.J.G Kailola
Keyword(s):  
Lactuca Sativa ◽  
Block Design ◽  
Economic Value ◽  
Organic Fertilizers ◽  
Plant Populations ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Chemical Residues ◽  
The Impact ◽  
Increase Crop Yield

Lettuce (Lactuca sativa L.)is one of hleafy vegetables that have high economic value in Indonesia and it gives good benef its ton the con sumers.The us of organic fertilizers is expected to be more optimal in agriculture today, considering the impact that the use of inorganic fertilizers may damage the soil and increasing environmental pollution with chemical residues in the soil, which result in decreased land productivity. This study aimed  to determine the effect of Bioboost fertilizer to increase crop yield of lettuce. Treatment were arranged in a Randomized Block Design, with one factor namely the concentration of Bioboost fertilizer consisting of 7 treatments:  B0=0 cc (control), B1= 20 cc, B2= 40 cc, B3= 60 cc, B4= 80 cc, B5=100 cc  per liter of water, and B6 = 120 cc / liter of water, with 3 replications so that there were 21 experimental units. Each treatmental unit consisted of 8 plants so that overall there were 168 plant populations. These results indicated  that concentration of Bioboost bio-fertilizers gave a significant effects on the growth of lettuce. Fertilizer cencentration of 80 cc / liter of water (B4) was the best concentration for growth and increased yield of lettuce.

scholarly journals PENGARUH JARAK TANAM DAN DOSIS PUPUK NPK MAJEMUK TERHADAP PERTUMBUHAN, PRODUKSI BUNGA, DAN ANALISIS USAHA TANI ROSELA MERAH

2020 ◽  
Vol 18 (1) ◽  
pp. 17
Author(s):  
BUDI SANTOSO ◽  
UNTUNG SETYO-BUDI ◽  
ELDA NURNASARI
Keyword(s):  
Production Cost ◽  
Block Design ◽  
Market Price ◽  
Dry Weight ◽  
Hibiscus Sabdariffa ◽  
Plant Spacing ◽  
Fresh Weight ◽  
Compound Fertilizer ◽  
Randomized Block Design ◽  
Growth Production

<p>ABSTRAK<br />Penelitian mengenai jarak tanam dan pemupukan untuk tanaman<br />rosela merah (Hibiscus sabdariffa var. sabdariffa) belum banyak dilakukan.<br />Suatu penelitian, yang dilakukan di Desa Kanyoran, Kecamatan Semen,<br />Kabupaten Kediri pada tahun 2010, bertujuan untuk mendapatkan jarak<br />tanam dan dosis pupuk NPK majemuk yang tepat bagi pertumbuhan serta<br />produksi kelopak bunga rosela merah dan analisis usaha tani. Perlakuan<br />disusun dalam rancangan acak kelompok faktorial dengan 3 ulangan.<br />Sebagai faktor pertama adalah 3 ukuran jarak tanam yang terdiri atas 1) 80<br />x 50 cm; 2) 100 x 50 cm; dan 3) 120 x 50 cm; dan sebagai faktor kedua<br />adalah 5 dosis pupuk NPK majemuk yang terdiri atas a) 30 kg NPK/ha; b)<br />37,50 kg NPK/ha; c) 45 kg NPK/ha; d) 52,50 kg NPK/ha; dan e) 60 kg<br />NPK/ha. Hasil penelitian menunjukkan bahwa terjadi interaksi antara jarak<br />tanam (100 x 50 cm) dengan dosis pupuk (45 kg NPK/ha) yang<br />memberikan pertumbuhan tinggi tanaman, jumlah cabang produktif,<br />jumlah buah, bobot kelopak bunga berbiji, bobot biji, bobot basah kelopak<br />bunga tanpa biji, dan bobot kelopak bunga kering maksimal, masing-<br />masing sebesar 186,63 cm; 16,33 cabang; 117,00 buah; 41,33 kg/petak;<br />16,17 kg/petak; 26,67 kg/petak; dan 2,35 kg/petak (652,75 kg/ha). Usaha<br />tani rosela merah memberikan keuntungan sebesar Rp 10.420.000/ha<br />dengan B/C = 1,49. Harga pokok kelopak bunga kering sebesar<br />Rp13.031/kg lebih kecil dibanding harga pasar (Rp 40.000/kg), dan dapat<br />dijamin tidak akan terjadi kerugian bagi petani<br />Kata kunci : Hibiscus sabdariffa var. sabdariffa, jarak tanam, pupuk NPK<br />majemuk, pertumbuhan, produksi</p><p>ABSTRACT<br />There has been no research program on plant spacing and fertilization on<br />red roselle plant (Hibiscus sabdariffa var. sabdariffa) up to 2010. A study<br />conducted in Desa Kanyoran, Kecamatan Semen, Kediri in 2010, aimed at<br />getting appropriate plant spacing and NPK compound fertilizer dosage for<br />growth and calyx production of red roselle, as well as its farm analysis.<br />The experiment was arranged in a factorial randomized block design with<br />three replicates. As the first factor were 3 dimensions of plant spacing<br />consisting of 1) 80 x 50, 2) 100 x 50, and 3) 120 x 50 cm, and the second<br />factor were 5 doses of NPK compound fertilizer consisting of a) 30, b)<br />37.50, c) 45, d) 52.50, and e) 60 kg NPK/ha. The results showed that there<br />was an interaction between plant spacing (100 x 50 cm) with fertilizer<br />dosage (45 kg NPK/ha), which resulted in plant height, number of<br />productive branches, number of fruits, weight calyx with seed, seed<br />weight, fresh weight of seedless calyx, and maximum dry weight of calyx,<br />each amounting to 186.63 cm; 16.33 branches; 117.00 fruits; 41.33<br />kg/plot; 16.17 kg/plot; 26.67 kg/plot; and 2.35 kg/plot (652.75 kg/ha),<br />respectively. Red roselle farm provided a gain of Rp10,420,000/ha with a<br />B/C of 1.49. Production cost of dried calyx was Rp13,031/kg, lower than<br />market price (Rp 40,000/kg), and was guaranteed to be no loss to farmers.<br />Key words: Hibiscus sabdariffa var. sabdariffa, plant spacing, NPK<br />compound fertilizer, growth, production</p>

scholarly journals CULTIVO DE ALFACE SOB INTERVALOS DE RECIRCULAÇÕES DAS SOLUÇÕES NUTRITIVAS EM SISTEMAS HIDROPÔNICOS USANDO ÁGUA SALOBRA

Irriga ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 67-96
Author(s):  
Fabio Tayrone Oliveira de Freitas ◽  
Tales Miler Soares ◽  
Mairton Gomes da Silva ◽  
Maria Raphaela Severo Rafael
Keyword(s):  
Nutrient Solution ◽  
Lactuca Sativa ◽  
Brackish Water ◽  
Block Design ◽  
Solution Temperature ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Nutrient Film Technique ◽  
Hydroponic Systems ◽  
E Mail

CULTIVO DE ALFACE SOB INTERVALOS DE RECIRCULAÇÕES DAS SOLUÇÕES NUTRITIVAS EM SISTEMAS HIDROPÔNICOS USANDO ÁGUA SALOBRA     FABIO TAYRONE OLIVEIRA DE FREITAS1; TALES MILER SOARES1; MAIRTON GOMES DA SILVA1 E MARIA RAPHAELA SEVERO RAFAEL2   1 Programa de Pós-Graduação em Engenharia Agrícola, Núcleo de Engenharia de Água e Solo, Universidade Federal do Recôncavo da Bahia-UFRB, Rua Rui Barbosa, 710 - Campus Universitário, CEP: 44380-000, Cruz das Almas-BA, Brasil. E-mail: [email protected], [email protected], [email protected] 2 Programa de Pós-Graduação em Engenharia Agrícola, Universidade Federal do Vale do São Francisco-UNIVASF, Av. Antônio Carlos Magalhães, 510 Country Club, CEP: 48.902-300, Juazeiro-BA, Brasil. E-mail: [email protected]     1 RESUMO   Objetivou-se no presente estudo avaliar o crescimento e a produção da alface usando água salobra sob diferentes intervalos de recirculações das soluções nutritivas em sistemas hidropônicos. Dois experimentos foram conduzidos concomitantemente em blocos casualizados com cinco repetições. Três cultivares de alface (‘Gloriosa’, ‘Robusta’ e ‘Tainá’) foram cultivadas no mesmo canal hidropônico, sob as seguintes interações: dois sistemas hidropônicos (NFT – técnica do fluxo laminar de nutrientes e DFT – técnica do fluxo profundo, ambos em tubos de PVC) e dois níveis de condutividade elétrica da água – CEa (0,3 e 5,3 dS m–1), no Experimento I; no Experimento II, os mesmos dois níveis de CEa e três intervalos de recirculações das soluções nutritivas (0,25; 2 e 4 h), apenas no sistema DFT. No Experimento I, em geral, os sistemas hidropônicos não promoveram mudanças significativas nas variáveis de crescimento e produção das alfaces. Para o Experimento II, foi viável adotar intervalos de recirculações das soluções de até 2 h (cultivar ‘Robusta’) e 4 h (cultivares ‘Gloriosa’ e ‘Tainá’) no sistema DFT em tubos. De modo geral, apesar das reduções no crescimento e produção da alface utilizando-se água salobra (CEa 5,3 dS m–1), não houve depreciação da qualidade visual do produto para comercialização.   Palavras-chave: Lactuca sativa L., cultivo sem solo, oxigênio dissolvido, salinidade, temperatura da solução nutritiva.     FREITAS, F. T. O.; SOARES, T. M.; SILVA, M. G.; RAFAEL, M. R. S. LETTUCE CULTIVATION UNDER DIFFERENT RECIRCULATION INTERVALS OF THE NUTRIENT SOLUTION IN HYDROPONIC SYSTEMS USING BRACKISH WATER     2 ABSTRACT   This study aimed to evaluate the growth and production of lettuce using brackish water under different recirculation intervals of the nutrient solution in hydroponic systems. Two experiments were conducted concomitantly, in a randomized block design with five replicates. Three lettuce cultivars (Gloriosa, Robusta and Tainá) were grown in the same hydroponic channel, under the following interactions: between two hydroponic systems (NFT – Nutrient Film Technique and DFT – Deep Flow Technique, both in PVC tubes) and two levels of electrical conductivity of water – ECw (0.3 and 5.3 dS m–1), in Experiment I; in Experiment II, between the same two levels of ECw (0.3 and 5.3 dS m–1) and three recirculation intervals of the nutrient solution (0.25, 2 and 4 h), only in the DFT system. In Experiment I, in general, hydroponic systems caused no significant changes in the growth and production variables of lettuce. For Experiment II, it was viable to adopt recirculation intervals of the nutrient solution of up to 2 h (cultivar Robusta) and 4 h (cultivars Gloriosa and Tainá) in the DFT system in tubes. Generally, despite the reductions in growth and production of lettuce using brackish water (ECw 5.3 dS m–1), but without deleterious effects on the visual quality of the product for commercialization.   Keywords: Lactuca sativa L., soilless cultivation, dissolved oxygen, salinity, nutrient solution temperature.

scholarly journals Respon Pertumbuhan Dan Hasil Tanaman Padi (Oryza sativa L.) Varietas IPB 3S Pada Beberapa Sistem Jajar Legowo

Jurnal Agrium ◽  
2020 ◽  
Vol 17 (1) ◽  
Author(s):  
Maisura Maisura ◽  
Jamidi Jamidi ◽  
Asmaul Husna
Keyword(s):  
Harvest Index ◽  
Oryza Sativa L ◽  
Block Design ◽  
Staple Food ◽  
Plant Spacing ◽  
Randomized Block Design ◽  
Weight Yield ◽  
The Impact ◽  
Planting System ◽  
Growing Population

Rice is the main staple food for Indonesian people where it is cultivated in the paddy field. Considering the population growth in Indonesia is increasing, it requires an effort to increase rice production to meet the needs of the growing population. One of the efforts is through planting superior varieties such as IPB 3S with a planting system which is known as “Jajar Legowo”. This research was conducted from January to April 2018 in Puloe Iboih Village, Kuta Makmur Sub-district, North Aceh and Agroecotechnology Laboratory, Malikussaleh University. The purpose of this research is to discover the impact of the “Jajar Legowo” planting system on the growth and production of IPB 3S variety. This research used  Randomized Block Design (RBD) Non-Factorial with planting system Jajar Legowo (3:1 and 4:1) which have plant spacing 25cmx25 cm with space between plants 40 cm. These treatments had 3 replications. The results revealed that planting system Jajar Legowo significantly increased the number of tillers at 50 and 60 days after planting, plant height at 30 days after planting, the amount of chlorophyll at 60 days after planting, grain weight, yield, and harvest index. From this research, it is found that the best plant spacing in the Jajar Legowo planting system was 3:1.

scholarly journals The effect of combination of AB-mix nutrition with liquid organic fertilizer of tofu liquid waste on hydroponical growth and production of lettage (Lactuca sativa L.)

2021 ◽  
Vol 4 (1) ◽  
pp. 165-170
Author(s):  
Arnis En Yulia ◽  
Murniati ◽  
Isna Rahma Dini ◽  
Laila Manja
Keyword(s):  
Block Design ◽  
Organic Fertilizer ◽  
Liquid Waste ◽  
Leaf Length ◽  
Growth And Yield ◽  
Fresh Weight ◽  
Root Volume ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Number Of Leaves

This study aims to determine the effect of the combination of AB mix nutrients with liquid organic fertilizer (LOF) of tofu liquid waste on the growth and yield of lettuce plants and to obtain the best combination for the growth and yield of lettuce hydroponically. This study used a non-factorial Randomized Block Design (RBD), consisting of a comparison of nutritional treatments, namely: N1 = 100% AB mix + 0% LOF of liquid waste tofu, N2= 75% AB mix + 25% LOF of tofu liquid waste, N3= 50% AB mix + 50% LOF of tofu liquid waste, N4= 25% AB mix + 75 % LOF of tofu liquid waste, N5= 100% LOF of waste liquid tofu which consists of 4 replications. Parameters observed were plant height, number of leaves, leaf length, leaf width, root length, fresh weight, root volume and weight fit for consumption. The results showed that the administration of 50% AB mix + 50% LOF of tofu liquid waste and 25% AB mix + 75% LOF of tofu liquid waste showed results that tended to be the same but the results of the combination of 75% AB mix + 25% LOF of tofu liquid waste were higher. On the parameters of the number of leaves is 11.12 strands, fresh weight is 66.40 g and suitable weight for consumption is 58.31 g.

scholarly journals Preparation Protein Hydrolysates from Fish by-product and Study Effected on Lettuce (Lactuca sativa L.) Growth, Yield, Quality and Enhanced Salt Tolerance

2019 ◽  
Vol 32 ◽  
pp. 246-255
Author(s):  
Haider M.H. Al-Malieky ◽  
Awatif N. Jerry
Keyword(s):  
Lactuca Sativa ◽  
Foliar Application ◽  
Block Design ◽  
Total Yield ◽  
Winter Season ◽  
Protein Hydrolysates ◽  
Control Treatment ◽  
Fresh Weight ◽  
Shoot Fresh Weight ◽  
Lactuca Sativa L

The experiment was carried out during the winter season 2019-2018 in Al-Hartha district, Basrah Governorate to study the effects of fish by-product prepared by Alcalase and Flavourzyme enzyme as a foliar application on lettuce (Lactuca sativa L.) yield and quality grown under salinity conditions. Fish by-product protein hydrolysate was spray-applied (3 and 6ml. L-1) additional to control treatment (spraying with water) referred to (T0-T4) at four (S4), six(S6) times after 20 days transplanting at10-day intervals. Randomized Complete Block Design (R.C.B.D.) was used as factorial experiment. Treatment means were compared by using Least Significant Differences (L.S.D.) at a probability of 0.05. The results showed that spraying with protein hydrolysates had a significant effect on most studied characters compared to control treatment. Results showed that foliar application with (T2) significantly increased the total leaves number, leaves area, carbohydrate ,proline, shoot fresh weight of plant, dry matter, total soluble solids (TSS %) and total yield additional to significantly decreased in nitrate contents, while foliar application with (T4) significantly increased in the plant height and stem height. The results showed that spraying six times (S6) were significant increases in these growth characters comparing with four sprays (S4). The interaction between treatments and spraying number show significantly increased in some characters, the (T2 S6) had the highest value shoot fresh weight 762.5g and total yield 17.899 tone.donum-1.

scholarly journals DOSES E MODOS DE APLICAÇÃO DE UREIA REVESTIDA COM POLÍMERO NO CULTIVO DE ALFACE AMERICANA

Nativa ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 579-584
Author(s):  
Hamilton César de Oliveira Charlo ◽  
Juliano da Silva Martins de Almeida ◽  
Valdeci Orioli Júnior ◽  
Regina Maria Quintão Lana
Keyword(s):  
Lactuca Sativa ◽  
Block Design ◽  
N Fertilization ◽  
Additional Treatment ◽  
Lactuca Sativa L ◽  
Randomized Block Design ◽  
Coated Urea ◽  
Commercial Yield ◽  
Polymer Coated Urea ◽  
N Rates

O objetivo deste estudo foi avaliar o efeito de doses e modos de aplicação de N, fornecido por meio de ureia revestida, no estado nutricional e produção de alface americana. Utilizou-se o delineamento em blocos ao acaso em arranjo fatorial 6x4 + 1, sendo seis doses de N (28,75; 57,50; 115,00; 172,50; 230,00; 287,50 kg ha-1 de N), como fonte a ureia revestida, e quatro modos de aplicação do nutriente (100% da dose no transplante; 50% no transplante + 50% aos 10 dias após o transplante (DAT); 25% no transplante + 75% aos 10 dias DAT; 25% no transplante + 25% a cada cobertura, aos 10, 20 e 30 DAT). No tratamento adicional utilizou-se a ureia convencional. Foram determinados os teores foliares de N, P, K, Ca e Mg, a massa fresca total e comercial da cabeça, o diâmetro do caule, a altura da planta e o diâmetro da cabeça aos 30 e 60 dias após o transplante. Verificou-se que a adubação nitrogenada aumentou os teores foliares de N, Ca e Mg, e reduziu os teores foliares de K e P. Não houve influência das doses de N proveniente de ureia revestida com polímero e dos modos de aplicação nos atributos morfológicos e produtivos da cultura. Palavras-chave: Lactuca sativa L.; nitrogênio; fertilizante de liberação lenta; fertilizante de liberação controlada.   RATES AND APPLICATIONS WAYS OF POLYMER-COATED UREA IN CRISPHEAD LETTUCE CULTIVATION   ABSTRACT: The aim of this study was to evaluate the effect of N rates (using a polymer-coated urea) and N application ways in nutritional status and yield of crisphead lettuce. The randomized block design in a 6 x 4 + 1 factorial arrangement was used, with six N rates (28.75, 57.50, 115.00, 172.50, 230.00, 287.50 kg ha-1 of N), with the use of polymer-coated urea, and four nutrient application ways (100% of the transplant rate, 50% at the transplant + 50% at the 10 days after the transplant (DAT), 25% at the transplant + 75% at 10 days DAT, 25% at transplant + 25% at each side dressing fertilization at 10, 20 and 30 DAT). The additional treatment was related to the recommended N fertilization using conventional urea. N, P, K, Ca and Mg, total and commercial yield, stem diameter, plant height and head diameter were determined at 30 and 60 days after transplant. Nitrogen fertilization increased the N, Ca and Mg foliar levels, independently of the application way. However, in general, it reduced the leaf levels of K and P. There was no influence of N rates from polymer-coated urea and application way on the morphological attributes and yield of the crop. Keywords: Lactuca sativa L.; nitrogen; slow-release fertilizer; controlled-release fertilizer.

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