Vitória Ediclécia Borges

Beet Crop under Different Fertilization and Nitrogen Fertigation in Protected Environment

Chemical fertilizers have been increasingly used in agriculture. The application of these nutrients via irrigation water has been evaluated in order to obtain productive results in agricultural yield. The objective of this research was to evaluate the effect of nitrogen (N) doses, applied by fertigation and associated with different types of basal fertilization, on the growth and production of beet. The experiment was conducted at the Federal University of Campina Grande (UFCG), in a protected environment belonging to the Academic Unit of Agricultural Engineering (UAEA). The adopted statistical design was completely randomized blocks, with three replicates, and the factors were arranged in a 5 × 3 factorial scheme, corresponding to five N doses (0, 50, 100, 150 and 200 mg dm-3 of soil), and three types basal fertilization (soil without fertilizer, earthworm humus, earthworm humus + NPK). At 45 days after transplanting, the number of leaves per plant, plant height, stem diameter, leaf area, green intensity, bulb diameter, stem length, bulb fresh weight, bulb dry weight and total soluble solids (°Brix) were quantified. Both Soil basal fertilization significantly influenced beet growth and production, and the treatment with earthworm humus and earthworm humus + NPK led to the best results for the analyzed variables. The highest N dose promoted the best performance for stem diameter and content of total soluble solids (°Brix).

Erosividade da chuva no período de 1973 a 2013 no município de Barbalha – CE (Rainfall erosivity in period from 1973 to 2013 in the Barbalha - CE municipality)

Objetivou-se determinar a taxa de erosividade da chuva (R) por EI30, visando o planejamento e tomada de decisao no setor agricola. Foram utilizados dados historicos de precipitacao periodo de 1973-2013, para o municipio de Barbalha - CE adquiridos da estacao meteorologica convencional pertencente ao Instituto Nacional de Meteorologia (INMET). O municipio de Barbalha – CE enquadra-se como de erosividade Forte com fator erosividade (R) de 7.849,0 MJ mm ha-1 h-1, necessitando de planejamento das atividades agricolas para que se obtenha maior rentabilidade dos cultivos. Os maiores indices de erosividade foram obtidos nos meses de Janeiro (6.877,6 MJ mm ha-1 h-1) e Abril (7.394,6 MJ mm ha-1 h-1) coincidindo com os meses mais chuvosos (593,8 e 533,8 mm, respectivamente). A correlacao do indice de erosividade EI30 com o coeficiente de chuva (Rc) foi alta, assim as equacoes obtidas podem ser utilizadas para estimar o fator R da equacao universal de perda de solo. A B S T R A C T The objective of this study was to determine the rain rate erosivity (R) for EI 30 , aiming at planning and decision making in agriculture. We used historical rainfall data 1973-2013, for the municipality of Barbalha - CE obtained from conventional weather station belonging to the National Institute of Meteorology (INMET). The county of Barbalha presents strong erosivity with erosivity factor (R) 7849.0 MJ mm ha -1 h -1 , requiring planning of agricultural activities in order to obtain higher profitability of crops. The highest rates of erosivity were obtained in January (6877.6 MJ mm ha -1 h -1 ) and April (7394.6 MJ mm ha -1 h -1 ) matching with the rainy months, 593.8 and 533.8 mm, respectively. The correlation between the erosivity index EI30 with the rainfall coefficient (Rc) was high, so the equations obtained can be used to estimate the R factor Universal equation of soil loss. Keywords: Erosion, EI 30 index, Factor R.

Vigor and tolerance of cowpea (Vigna unguiculata) genotypes under salt stress

Saline stress is a frequent phenomenon in the arid and semi-arid regions of the globe, affecting the agricultural production of these regions, and it is necessary to use strategies that minimize the impacts of saline stress under agriculture. This requires the incorporation of species, variety and genotypes tolerant to increase agricultural production in those regions. This study aimed to evaluate germination and initial growth of cowpea genotypes under salt stress. The experimental design was completely randomized in 19 x 3 factorial scheme, composed of nineteen cowpea cultivars and three osmotic potentials, with four replicates of 50 seeds each. The germination test lasted for eight days, when the seeds were evaluated for germination percentage, germination speed index, length of shoot and root, accumulation of dry mass of shoot and root. The increase in salinity affected germination and initial growth of the cowpea genotypes. The genotypes 6 MNCO2-689F-2-8, 10 MNCO2-675F-4-10, 12 MNCO3-737F-5-9, 16 MNCO2-677F-2, 18 BRS-Pajeú and 19 – Paulistinha exhibited higher tolerance to salt stress in the stage of germination and initial growth. The genotypes 11 MNCO2-675F-9-5, 13 BRS-Tumucumaque, 15 MNCO3-736F-7 and 17 BR17-Gurgueia were more susceptible to the effects of salt stress in the stage of germination and initial growth.

Growth and plant mass of radish fertirrigated with different doses nitrogen

The objective of the present study was to evaluate the effect of nitrogen doses applied via fertigation and associated with different types of crop establishment fertilization on growth and biomass of radish. The experiment was conducted in a greenhouse of the Academic Unit of Agricultural Engineering, Federal University of Campina Grande, from April to May 2014. Treatments consisted of five doses of nitrogen fertilizer applied by fertigation (0, 0.7, 1.4, 2.1 and 2.8g per pot) and three types of crop establishment fertilization (humus 2:2; NPK and control), arranged in a 5 x 3 factor design with four repetitions. The 15 treatments were arranged in 60 plots. The nitrogen source used in the study was urea, divided in three applications: the first application was carried out eight days after transplanting, the second, on day 15, and the third, on day 22. The crop establishment fertilization significantly influenced the growth variables and plant mass of the radish on day 35 after transplanting. The highest values of the variables (number of leaves, plant height, bulb diameter, leaf area, fresh mass of the aerial part, dry mass of the aerial part and root/aerial part were observed in the treatment with humus on day 35 after transplanting. The dose of 2.8g nitrogen per pot corresponding to 6.22g of urea per plant provided the highest yield for the variable number of leafs, leaf area and root length on day 35 after transplanting.