EFFECT OF FERTILIZATION NORMS ON THE GRAFT-TAKE RATE AND QUALITY INDICATORS OF PROMISING APPLE SEEDLINGS
Keywords:
apple tree, cultivar, graft, rootstock, clone, fertilizer, application rate, seedling, standard.Abstract
This article presents the results of research dedicated to studying the effects of different mineral fertilizer application rates on the survival and quality of apple seedlings grafted onto clonal rootstocks with varying vigor levels under the conditions of the Pastdargom district in the Samarkand region. The research focused on the Golden Delicious apple cultivar grafted onto the vegetatively propagated dwarf rootstock MIX. A comparative analysis was conducted in the second field of the nursery to evaluate the influence of various mineral fertilizer rates on the survival of grafted plants, their development, and the yield and quality of standard seedlings. The following fertilizer application rates were studied: a) without fertilizers (control); b) N90P60K45; c) N120P80K60; d) N140P100K70; e) N160P120K80; f) N180P140K90. The best results for survival rate (85.5% - 59,773 thousand pieces/ha) and the yield of high-quality seedlings (87% of grade I – 52,062 standard seedlings per hectare) were observed with the application of fertilizers at the rate of N140P100K70.
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