Abstract: The objective of this work was to evaluate the growth and photosynthetic characteristics of ‘Sharpblue’ blueberry under different treatments of moistube irrigation and fertilization. The experiment followed a randomized block design, with three moistube patterns (LM: level setting of moistube, UM: upright setting of moistube, RM: round setting of moistube) and four fertilization levels (F₀: 0 g·plant^-1, F₁: 10 g·plant^-1, F₂: 20 g·plant^-1 and F₃: 30 g·plant^-1). We examined the effects of different moistube patterns and fertilization levels on the growth, chlorophyll content, net photosynthetic (P_n), transpiration rate (T_r), dry matter accumulation, and water use efficiency of blueberry. The results showed that compared with LM treatment, UM increased P_n, T_r, dry matter accumulation, and water use efficiency by 21.47%, 16.67%, 16.90% and 27.35%, while RM increased those variables by 24.82%, 38.66%, 39.66% and 44.35%, respectively. RM treatment significantly increased plant height, stem diameter, new shoot length, and chlorophyll content of blueberry. With increasing fertilization levels, plant height, stem diameter, new shoot length and chlorophyll content of blueberry first increased and then decreased. Compared with F₀ treatment, F₂ increased P_n, T_r, dry matter accumulation and water use efficiency by 14.74%, 13.49%, 22.62% and 21.09%, respectively. Compared with LMF₀ treatment, the dry matter accumulation of LMF₂, UMF₂ and RMF₂ was increased by17.53%, 40.58% and 61.14%, and water use efficiency was increased by 17.53%, 53.14% and 66.55%, respectively. From the perspective of high efficiency and water saving, RMF₂ was the best combination of moistube irrigation and fertilization.

Key words: Chestnut, Soil fertility, Stem diseases, Regression analysis