Original research article
Physiological Aspects, Leaf-nutrient Content and Growth Parameters of some Grafted-pear Rootstocks Grown under Different Soil Types
2018, 83 (3) p. 243-250
Abstract
Low average production is an important problem in pear trees in calcareous soils of Iran, which make over 60% of Iranian soils. Therefore, the objective of this study was to study the effects of three soil types with different levels of soil lime on physiological aspects, leaf-nutrient content, and growth parameters of some grafted-pear rootstocks. The field experiment was based on a split factorial layout in a randomized complete block design with three replications and was carried out in Horticulture Research Station during the two growing seasons, 2015 and 2016. Three field-collected soil types were used as the main plots: less lime silt-loamy, fairly lime silt-loamy and lime rich clay loamy and three grafted-pear rootstocks (OHF69, Pyrodwarf and seedling rootstock) grafted with 'Daregazi', 'Louise Bonne' and 'William Duchess' scions were assigned in sub-plots. Based on the combined analysis, all interactions among soil types and grafted-pear rootstocks were significant for all studied parameters (except of SPAD-Value and leaf area in 2015 study and chlorophyll fluorescence parameters including FO and FV/FM in 2016 study). The results of this research showed different responses according to studied various scion/rootstocks combinations in soil type treatments. In the present work, the best graft combination for lime rich clay loamy (silt 30%, sand 40%, clay 28% and lime 14.6%) soils is OHF69 rootstock grafted with 'Louise Bonne' in each two years of study (2015 and 2016).
Keywords
soil type, levels of soil lime, grafted-pear rootstocks
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