Efeitos de níveis de água e adubação potássica no desenvolvimento do cajueiro anão-precoce, clone BRS -189

Abstract

The main goal of this work was to analyze the effect of water and potassium and interaction between these factors parameters which are related with vegetative growth (height of the plant, diameter of trunk below of the coastal and the diameter of trunk above of the coastal) and the parameters related with nutritional situation (potassium, iron and sodium) of the precocious dwarfish cashew tree (Anacardium occidentale L.) variety BRS 189. A field experiment was carried out in the parcel of ground D in at Curu-Pentecoste Irrigation District, Ceará, Brazil, from september/2005 to february/2007. The statistical design was completely randomized blocks in split-plots, with four primary treatments, four secondary and four blocks. The main treatments corresponded to four water depths (W1 = 25% ETc; W2 = 50% ETc; W3 = 100% ETc; W4 = 150% ETc) with four levels of potassium (K0 = 0 g; K1 = 30 g; K2 = 60 g; K3 = 120 g de K2O. plant-1.year-1). The crop was installed at 7.0m 7.0 m spacing, irrigated by a microsprinkle irrigation system with 50 L.h-1 emitters. The results showed that the water and interaction water and potassium were significant to none parameters analyzed. Potassium influenced significantly height of the plant and diameter of trunk below of the coastal. The height of plant presented significant influence on water level only on the treatment were none potassium was applied. As to total nutrients in the plants: potassium, iron and sodium in a plant, only potassium presented compatible significant (8.1%) to water. To crop in studies water deficit didn’t limited growing of dwarfish cashew tree.