The influence of nitrogen fertilizers on nitrate accumulation in leaves of orange Washington Navel

The goal of the present work was to find out the influence of norms and forms of nitrogen fertilizers on the accumulation of nitrates in young and old leaves of Washington -Navel plants. The researches took place of the experimental plot of scientific industrial union of tea, subtropical cultures and tea industry in Anaseuli. In order to determine the influence of the norms of nitrogen fertilizers on the accumulation of nitrates, we used ammonium sulfate and ammonium nitrate on the background of P, K, Ca, Mg with the dozes - 75, 150, 300, 450 g per tree, following all the agricultural rules. And from the forms of nitrogen fertilizers on the accumulation of nitrates, on the background of P, K, Ca, Mg we used ammonium sulfate, ammonium nitrate, ammonium carbonate, Montanus nitrate and sodium nitrate. In one of the tests we took 3 full productive plants and 48 plants - in the entire experiment. As a result of the research we confirm that during the vegetation period in the leaves of Washington-Navel, the norms of nitrogen fertilizers are not in direct connection with the accumulation of nitrates and during using the forms of nitrogen fertilizers we can observe some peculiarities: the maximum accumulation of nitrates takes place in the first year of the second vegetation period while using ammonium nitrates in old and young leaves. In the first year of using ammonium carbonate and Sodium nitrate, the nitrates are accumulates only in young leaves in the second vegetative period and in the second year - while using ammonium nitrates in old and young leaves.