Published in Scientific Papers. Series B, Horticulture, Vol. LXIII, Issue 1
Written by Vanya AKOVA, Marieta NESHEVA, Irina STANEVA, Svetoslav MALCHEV, Viktorija NIKOLOVA, Valentina BOZHKOVA, Nesho NESHEV
Objects of the present study were two plum cultivars – 'Jojo’ and 'Topgigant Plus’, grafted on the new clonal rootstock 'Docera 6’and the seedling rootstock P. cerasifera. The trees were planted in 2016 at the Fruit Growing Institute of Plovdiv, Bulgaria. Increasing amounts of ammonium nitrate (NH4NO3) - 260 kg hа-1, 330 kg hа-1, 400 kg hа-1 were applied twice during the vegetation periods in 2017 and 2018. The aim of the study was to investigate the dependence between the level of mineral nutrients content (N, P, K, Ca, Mg and Fe) in the leaves of the tested plum/rootstock combinations. The obtained results showed that the nutrient content in the leaves was affected by the rootstock but by the fertilizer rates. The values for the nitrogen content varied in range - 1.95%-2.49%. The content of K in the leaves was approximately twice higher for the trees grafted on 'Docera 6’. A reverse trend was observed for the elements Mg and Fe.
[Read full article] [Citation]
