The effect of "N" "P" "K" Fertilizers on Hand Planting Pinus pinea in Coastal Areas of Caspian Sea

In the coastal area of Jafroud, a region in the North East of Khomamcity, Pinus pinea trees are grown. Early experiments (spraying field studies) indicated that Pinus pinea was faced with a high lacking of "N", "P", and "K" elements in this region. A factorial fertilizer study in the form of randomized complete design with four replications was carried out in the region. Factor 1 consisted of 3 levels of nitrogen fertilizer (a1=112, a2=224, and a3=336 kgN/ha), factor 2 of 3 levels of super phosphate fertilizer (b1=56, b2= 112, and b3=168 kgP2O¬5¬/ha) and factor 3 was consistent of 3 levels of potassium chloride fertilizer (c1= 22.8, c2=45.6, and c3=68.2 kgK2O/ha). Fertilizing had been carried out in two times, one in August 1999 and the other in March 2000. The purpose was to identify the effect of fertilizers on height, diameter, and tree needles as well as on the concentration of "N", "P" and "K" elements in the trees. The results in dictated that the effect of the mixture of "N.P.K" fertilizers on the tree height and growth of tree needles was significant. The highest needle growth and tree height was observed in the a3b¬2c2 treatment. There was a high and significant correlation observed between tree needle growth and height. The results also indicated that the main growth limiting element was N