Nitrogen doses on adubation in clonal mini garden of surinam cherry

The minicutting is an effective and quick method of vegetative propagation, dedicated to spread of forest and fruit trees, providing the formation of homogeneous orchards. In order to determine the adubation management in multiplication of Surinam cherry trees by minicutting in clonal gardens, we tested increased nitrogen (N) doses in fertilizer formulation, in two stages, over a period of 260 days. The solutions adopted in the first stage were: solution A: 10 g [L.sup.-1] Kristalon[R] (NPK 4,5-9,6-28,8), solution B: 10 g [L.sup.-1] Kristalon[R] + 3.5 g of urea (NPK 18 -9,6-28,8) and solution c: 10 g [L.sup.-1] Kristalon[R] + 7.0 g of urea (NPK 36-9,6-28,8). In the second step we used half of the fertilizer Kristalon[R] doses (5 g [L.sup.-1]) and the same additions of urea. We evaluated the production and rooting of minicuttings and we monitored the pH and electrical conductivity (EC) of each solution and of the substrate. The experimental design was the completely randomized design, with seven vessels with five stock plants each per treatment. The first collect of minicuttings occurred seven days after we started the treatment. The solutions A and B promoted greater production of mini cuttings. The reduction of commercial fertilizer increased the rooting and reduced the flutuations in pH and EC values. The production in large scale of cuttings of this species by using this technique is possible particularly when low doses of nitrogen in the fertilizer. Index-terms: asexual propagation, clonal multiplication, Myrtaceae El miniestaquillado es un metodo eficaz y rapido de propagacion vegetativa, empleado en plantas forestales y frutiferas, generando la formacion de huertos homogeneos. Con el objetivo de determinar el manejo del abonado en la multiplicacion de pitanguera bajo miniestaquillado en jardines clonales se probaron dosis crecientes de Nitrogeno (N), tras dos etapas, en periodo de 260 dias. Em la primera etapa se testaron las siguientes solucoes: solucion A: 10 g [L.sup.-1] Kristalon[R] (NPK 4,5-9,6-28,8), B: 10 g [L.sup.-1] Kristalon[R] + 3,5g de urea (NPK 18-9,6-28,8) y c: 10 g [L.sup.-1] Kristalon[R] + 7,0g de urea (NPK 36-9,6-28,8). En la segunda etapa se utilizo la mitad de las dosis del Kristalon[R] (5g [L.sup.-1]) y las mismas de urea. Se evaluaron la produccion y enraizamiento de las miniestaquillas y se monitoro los valores del pH y de la conductividad electrica (CE) de cada solucion, ademas del sustrato. El diseno experimental fue completam