LIMA, G. S.; http://lattes.cnpq.br/0683441338403298; LIMA, Geovani Soares de.
Résumé:
The castor bean (R/c/nus commt/n/s L.) is a plant of the Euphorbiaceae family, which has
great adaptation capacity to varied climatic conditions, beyond of resistance to water
deficit and possibility of cultivation in severas sons. In this sense, aimed at with this
research, to evaluate the effect of different salinity leveis of irrigation water associated to
dose of manuring nitrogen, on growth and components of production of castor bean cv.
BRS Energia, cultivated in lysimeters under field conditions. The treatments consisted of
the combination of ave leveis of electric conductivity of the irrigation water (0.4; 1 .4; 2.41
3.4 and 4.4 dS m'l) and ave doses of nitrogen (501 75; 1001 125 and 150% of the dose
recommended for pot experiment). A blocks randomized design was adopted in factorial
5 x 5, with three replications, totaling seventy ave experimental units. Salinity of irrigation
water reduce growth of pastor bean cv. BRS Energia, observed by decrease of plant
height, stem diameter, number of leaves and leaf área. Mass of one hundred seeds, oil
content and number of fruits of the primary raceme are affected negatively by salinity of
irrigation water larger than 0.4 dS m'l, being the number of fruits the most sensitive
variable. Salinity of irrigation water up to 1 .37 dS m'l provides content of seeds oil of 47%
for castor bean cv. BRS Energia. The increase of doses of manuring nitrogen reduced
the effect of the salinity on leaf área of castor bean cv. BRS Energia. Castor bean
answers significantly to interaction between the factors water salinity and doses of
nitrogen to stem diameter and length of the primary raceme.