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Mossoró, Brazil

Neto P.A.,IFCE | Grangeiro L.C.,DCV UFERSA | Mendes A.M.S.,Embrapa Semiarido | Costa N.D.,Embrapa Semiarido | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

With the objective to evaluate the growth and nutrient accumulation by onion cultivars, experiments were conducted at the experimental station of Bebedouro (Petrolina, PE) of Embrapa Semiarid, during May to October 2009, and in Baraúna, RN, in commercial area, from June to October 2009. The statistical design utilized in the experiment was a randomized complete block design, RBD with four replications in a 2 × 6 factorial. Treatments were the combinations of two cultivars of onion (IPA 11 and Texas Grano 502) and six sampling times (15, 30, 45, 60, 75 and 90 days after transplanting - DAT). In each collection six plants per replication were used. The onion cultivars IPA11 and Texas Grano presented initially slow growth, increasing from 30 DAT. Greater increases in total dry mass, shoot and bulb occurred at 60-75 DAT. The nutrients were absorbed by the onion in the following order: Ca > K > N > Mg > P and Ca > N > K > Mg > P for 'Texas Grano 502" and "IPA11" in Petrolina and K > Ca > N > Mg > P and N > K > Ca > Mg > P for 'Texas Grano 502" and "IPA 11" in Baraúna. Cultivars Texas Grano 502 and 11 IPA exported more nutrients in Baraúna. Source

Henriques G.P.S.A.,PPGF UFERSA | Grangeiro L.C.,DCV UFERSA | Paulino R.C.,PPGF UFERSA | Marrocos S.T.P.,PPGF UFERSA | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The aim of this study was to evaluate the agronomic performance of onions in different planting densities in Mossoró, RN. The experimental design used was a complete randomized blocks in factorial scheme 2 × 5, with four replications. The treatments consisted of the combination of two onion cultivars (Vale Ouro IPA 11 and Bella Dura) and five planting densities (80, 120, 160, 200 and 240 plants m-2). The evaluated characteristics were: classification of bulbs according to the transverse diameter; total, commercial and noncommercial productivity; mean mass of bulb, dry mass of bulb and relative format of bulbs. The most productive cultivar was IPA 11, with total productivity of 26.76 t ha-1. The density that provided the greatest total productivity (30.48 t ha-1) was the 204 plants m-2 and commercial (24.74 t ha-1) was the 161 plants m-2. The increase in density reduced the average of medium and dry bulb mass, bulbs percentage of classes 2 and 3 as well as increased non-commercial yield, percentage of bulbs class 1 (waste) and relation of bulb shape. The cultivar Vale Ouro IPA 11 was superior to the hybrid Bella Dura regarding total bulb yield, average weight of commercial bulbs and format relations, regardless of plant density. Source

Costa E.M.,Rural University | Godoy M.S.,DCV UFERSA | Araujo E.L.,DCV UFERSA | Silva R.I.R.,Instituto Federal Of Educacao | Wolff V.R.S.,Fundacao Estadual de Pesquisa Agropecuaria FEPAGRO
Bioscience Journal | Year: 2013

The infestation of Azadirachta indica A. Juss. (Meliaceae) by scale insects of the species Aonidiella orientalis (Newstead) (Hemiptera: Diaspididae) is reported for the first time. Leaves and twigs exhibiting signs of wilting were collected from the basal-interior parts of the canopy of neem trees that had been planted in the city of Limoeiro do Norte, located in the northeastern state of Ceará, Brazil. The identity of the oriental scale insect A. orientalis was confirmed by microscopic examination. The insect pest has not been observed previously in the northern states of Brazil, hence the present report is significant in that it focuses attention on the mobility of A. orientalis and on its potential to infest other plant species in that region. © 2013 Universidade Federal de Uberlandia. All rights reserved. Source

de Sousa R.P.,DCV UFERSA | E Silva P.S.L.,DCV UFERSA | de Assis J.P.,DCV UFERSA | de Oliveira V.R.,DCV UFERSA | Oliveira A.M.P.,Mestre em Irrigacao e Drenagem
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2015

The aim of this study was to determine the appropriate size of plot for evaluation of grain yield of sunflower. An experiment in randomized complete block design with 14 cultivars of sunflower and 10 replications was conducted in the period of May to July 2011. The plots consisted of four rows of 6 m in length, spaced 0.7 m and 0.3 m between plants. The useful area of the plot, consisting of the two central rows was divided into 12 basic units (UBs), each consisting of three plants in the row, the yield of sunflower per basic unit was determined. Grain yield of adjacent UBs were grouped to form 7 types of plots of five different pre-established sizes. The optimum plot size was estimated by the methods of modified maximum curvature (3.74 m2) and the segmented linear model with plateau (2.48 m2), with the size of 3.74 m2of floor area considered suitable for assessment of grain yield of sunflower and less than the size generally used in research with sunflower. © 2015, Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved. Source

de Lima M.F.P.,DCV UFERSA | Porto M.A.F.,DCV UFERSA | Torres S.B.,DCV UFERSA | De Freitas R.M.O.,DCV UFERSA | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2015

In order to evaluate the effect of different concentrations of salts in irrigation water on emergence and growth of albízia seedling (Albizia lebbeck (L.) Benth.) an experiment was conducted in the greenhouse of the Department of Plant Sciences, Federal Rural University of Semi-arid, Mossoró, RN, in a completely randomized design with six treatments and four replications with 24 seeds in each plot. The treatments consisted of saline concentrations (EC) of 0.68 (supply water), 1.5, 3.0, 4.5, 6.0 and 7.5 dS m-1, which were obtained by the addition of NaCl in water. The evaluated variables were: percentage of emergence of seedling, speed of emergence index, shoot length, root length, number of leaves, accumulated electrical conductivity of the substrate index, chlorophyll content, dry mass of root, stem, leaves and total. The salinity negatively interferes in all parameters assessed in proportion to its increase in irrigation water. With major damage at concentrations above 1.5 dS m-1, characterizing this species considered as a glycophyte little tolerant to salinity. © 2014, Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved. Source

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