Yield of cucumber (Cucumis sativus L. cv. Brunex F-1) fertilized with N, P& K

Cucumber (Cucumis sativus L. cv. Brunex F-1), were grown under controlled g reenhouse conditions at Almeria (southern Spain). The experimental design c onsisted of 27 plots. The N, P, and K treatments were applied as follows: f our doses of N (N1 = 5 g/m(2), N2 = 10 g/m(2), N3 = 20 g/m(2), N4 = 40 g/m( 2)) as NH4NO3, two levels of P (P1 = 8 g/m(2), P2 = 16 g/m(2)) as H3PO4, an d finally two levels of K (K1 = 20 g/m(2), K2 = 40 g/m(2)) as K2SO4. Compar ison of the yields obtained, showed that moderate N rates prompted positive and highly significant increases. Both P and K at high rates had negative effects. The best nutrient combination to promote cucumber yield under our experimental conditions proved to be N2, P1, K1.