Split nitrogen doses and their efficiency in poppy (Papaver somniferum L.) nutrition
Losak, T.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))E-mail:losak@mendelu.cz | Richter, R.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
The efficiency of partial doses of nitrogen applied to poppy plants, cv. Opal, was assessed in a pot experiment. The ammonium nitrate was applied either in a single dose at the beginning of growing season or in two split doses with the second application at the stage of flowering. With the increasing dose of N, the number of capsules per plant during the harvest and their volume increased irregularly. The separated application of an optimum dose of N (i.e. 0.9 g N/pot) showed a statistically highly significant positive effect on the yield of poppy seeds in comparison with the same single dose of N (the increase was by 25.6%). The morphine concentration in the capsules increased with the increasing supply of N from 0.85 to 1.01%. The term of N application influenced the number of capsules per plant and their volume and morphine concentration irregularly.
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