HOLANDA FILHO, R. S. F.; http://lattes.cnpq.br/5140378435548742; HOLANDA FILHO, Roberto Silvio Frota de.
Résumé:
The purpose of this study was to assess the influence of saline water was
applied in increasing irrigation water depths in the chemical properties of the soil and
leachate as in the nutritional status, physiological attributes and yield of cassava. The
work was conducted in the area of Irrigation and Drainage of IF Baiano, Campus de
Senhor do Bonfim, BA (10° 28'S, 40° ll'W and 550 m). The culture installed in the
experimental area was cassava. To determine the soil chemical properties and
nutritional status of cassava, but also the productivity of the same, the experimental
design was completely randomized consisting of seven treatments and three
replications, totaling 21 units. To determine the chemical characteristics of the leachate
and physiological characteristics of culture, the experimental design was completely
randomized consisting of six treatments and three replications, totaling 18 units. The
treatments consisted of control (rainfed), a treatment irrigated with drinking water
(100% of ETc) and five treatments irrigated with saline water of 3 dS m"1 varying water
depths: 110% 120% 130%, 140% and 150% of ETc. The experiments with six
treatments did not possess the treatment control. The use of saline water increased the
concentration of magnesium and sodium in the soil at a depth of 0,2 m and also the
percentage of exchangeable sodium, the ratio of sodium adsorption and electrical
conductivity of soil at both 0,2 and 0,4 m; irrigation independently of water quality,
decreased the levei of potassium in the soil at both depths studied. In the first six
months of cultivation, nitrogen was the nutrient with higher content in cassava leaf
regardless of treatment, among the micronutrients, manganese foliar presented higher
content. The drainage water coming from irrigation with saline water showed higher
leveis of calcium, magnesium, sodium, chlorine, the ratio of sodium adsorption and
electrical conductivity. The use of saline water did not interfere with the physiological
attributes of mandioqueira. The use of drinking water increased the productivity of
mandioqueira.