Abstract The combined effects of four nitrogen (N) levels (0, 50, 100, and 150 μg/g soil) and six boron (B) rates (0, 20, 40, 60, 80, and 100 μg/g soil) on the growth and chemical composition of Kale‐ghoochi, a cultivar of pistachio (Pistacia vera L.) semi‐tolerant to B toxicity, and Badami, a cultivar very sensitive to B toxicity, were studied in a calcareous soil under greenhouse conditions. The application of 20 μg/g B has beneficial effects on leaf growth of the Kale‐ghoochi cultivar. The toxic effect of B application greater than 40 μg/g on pistachio growth was alleviated by application of 50 and 100 μg N/g for Kale‐ghoochi and Badami cultivars, respectively. The rate of B accumulation in pistachio shoots was reduced about 39 % by N additions of 50 to 150 μg/g for Badami, and 24, 52, and 69% with N rates of 50, 100, and 150 μg/g for Kale‐ghoochi, respectively. Therefore, when pistachio is grown in B‐enriched soils and/or is irrigated with water of relatively high B content, it is recommended that the plants be supplied with adequate N.

Pistacia

10.1080/01904169409364716

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Determination of the potential evapotranspiration and crop coefficient for saffron using a water-balance lysimeter

Archives of Agronomy and Soil Science (2011)

Najmeh Yarami Ali Akbar Kamgar‐Haghighi Ali Reza Sepaskhah Shahrokh Zand‐Parsa

Agriculture is the major consumer of water and it is possible to decrease water consumption in this sector by proper irrigation scheduling. Irrigation scheduling is based on crop water requirements. Saffron is an important crop in Iran. The main purpose of this study was to determine the potential evapotranspiration and crop coefficient for saffron using single and dual crop coefficients, in Badjgah region, College of Agriculture, Shiraz University, Shiraz, Iran. Three water-balance lysimeters were used for this experiment in a two-year study. Total saffron potential evapotranspiration values were 523 and 640 mm in the first and second growing seasons, respectively. The maximum evapotranspiration rates for saffron were 4.5 and 6.1 mm d−1 in the first and second growing seasons, respectively. Based on the results of this study, different saffron growing stages for evapotranspiration were 30, 40, 70 and 60 days. Crop coefficient (K c) values for the initial, mid- and late-season growth stages were 0.41–0.45, 0.93–1.05 and 0.29–0.31 in both years, respectively. Basal crop coefficient (K cb) values for the initial, mid- and late-season growth stages were 0.15–0.16, 0.41–0.65 and 0.15–0.17 in both years, respectively.

Crop coefficient

Lysimeter

Water balance

Irrigation scheduling

Growing season

Water use

10.1080/03650340.2010.485985

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Citations (39)

Estimation of zeolite application effect on solute transport parameters at different soils using HYDRUS-1D model

Iran agricultural research (2017)

M. Fooladi Dorhani Ali Reza Sepaskhah

10.22099/iar.2017.4107

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Citations (2)

Development and Evaluation of a Model for Yield Production of Wheat, Maize and Sugarbeet under Water and Salt Stresses

Biosystems Engineering (2006)

Ali Reza Sepaskhah A.R. Bazrafshan-Jahromi Zahra Shirmohammadi-Aliakbarkhani

Simulation Modeling

Water balance

10.1016/j.biosystemseng.2005.11.005

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Citations (32)

Interaction effects of irrigation regime and salinity on flower yield and growth of saffron

The Journal of Horticultural Science and Biotechnology (2009)

Ali Reza Sepaskhah Najmeh Yarami

SummarySaffron (Crocus sativus L.) is the most important export crop in the Islamic Republic of Iran. Water scarcity and salinity are important limitations for saffron production in arid and semi-arid regions. The objective of the present study was to determine the interaction effects of salinity and irrigation regime on flower yield and growth of saffron in a pot experiment under a transparent shelter. Irrigation treatments consisted of four irrigation intervals (i.e., 2, 4, 6, and 8 d between successive irrigation events). Salinity treatments in the irrigation water had EC values of 0.5 (tap water), 1.7, 2.9, and 4.0 dS m–1. The results indicated that saffron flower and corm yields were the most and the least sensitive to soil water depletion, respectively; and that leaf and root sensitivities lay between those of flowers and corms. Furthermore, we concluded that corm and root growth were inhibited at field-capacity soil water content and that deficit irrigation was necessary for optimum growth. Dry weight (DW) reductions per unit increase in the salinity of the drainage water were 14.2, 10.8, 9.1, and 2.9% for saffron flowers, corms, roots, and leaves, respectively. Threshold values for the EC of the drainage water ranged between 0.08 and 0.67 dS m–1 for flowers and roots, respectively. Furthermore, DW reductions per unit increase in salinity of the irrigation water for saffron flowers, corms, roots, and leaves were 28.3, 25.0, 21.1, and 7.0%, respectively. The threshold EC values of the irrigation water ranged between 0.13 and 0.48 dS m–1 for flowers and roots, respectively. When saline water was used to irrigate saffron, the irrigation interval needed to be more frequent (i.e., at 2-d intervals) to avoid severe water stress.

Corm

10.1080/14620316.2009.11512507

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Citations (37)