Z. Taghizadeh Tabari; H.R. Asghri; H. Abbasdokht; E. Babakhanzadeh sajirani
Abstract
Water deficit has been the major contributor to the decline in plant yield. Soil amendment and certain hormonal agents are some strategies applied to mitigate the adverse effects of drought stress. The purpose of this study was to investigate the effects of one soil modifier and one growth regulator ...
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Water deficit has been the major contributor to the decline in plant yield. Soil amendment and certain hormonal agents are some strategies applied to mitigate the adverse effects of drought stress. The purpose of this study was to investigate the effects of one soil modifier and one growth regulator on some physiological and morphological characteristics of Borago officinalis L. under water deficit conditions. The experiment was implemented as a split-factorial in a randomized complete block design with four replications at the research farm of Agriculture Faculty of Shahroud University of Technology, Iran during 2017- 2018. The main plots consisted of three levels of irrigation (usual irrigation every five days, irrigation every 10 and 15 days) and sub-plots consisted of biochar at three levels (0, 5 and 10 t ha-1) and salicylic acid at two levels (0 and 0.5 mM). Based on the results, biochar, salicylic acid, and water deficit factors affected the number of flowering stems, number of stems, stem height, the amount of chlorophylls a and b, total chlorophyll, and carotenoids significantly. Interactions between salicylic acid and water deficit levels had the most effects on carotenoids and chlorophyll b. Triple interaction of factors also affected the total dry weight, number of flowering stems, the number of stems, stem height, and chlorophyll b. Generally, water deficit stress decreased the amount of photosynthetic pigments and leaf growth indices of European borage compared to control, and salicylic acid and biochar reduced the negative effects on the amount of photosynthetic pigments. Therefore, the use of biochar as a soil modifier and salicylic acid as a growth regulator seems to be useful in ameliorating some of the negative effects of water stress on Borago officinalis.
Z. Bitarafan; H.R. Asghari; T. Hasanloo; A. Gholami; F. Moradi
Abstract
High demand for herbal medicines and the limited plant sources necessitates more research on these plants to increase their yield and effective compounds. The present study assessed the effect of biochar on yield and seed trigonelline content of fenugreek (Trigonella foenum-graceum L.) ecotypes under ...
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High demand for herbal medicines and the limited plant sources necessitates more research on these plants to increase their yield and effective compounds. The present study assessed the effect of biochar on yield and seed trigonelline content of fenugreek (Trigonella foenum-graceum L.) ecotypes under different irrigation regimes. Six branched fenugreek ecotypes including Dezful, Shushtar, Ardestan, Rehnan, Yazd and Khomeyni Shahr were treated by biochar application (at a rate of 7-8% of soil v/v) and non-application under two irrigation intervals of 4 (normal irrigation) and 8 (deficit irrigation) days using a split plot factorial experiment in a randomized complete block design with three replications. The study was conducted in the research field of Agricultural Biotechnology Research Institute of Iran in 2015. According to the results, biochar application increased the seed yield and biological yield under both irrigation intervals. The decreasing effect of increasing water intervals on seed yield, biological yield and trigonelline yield was observed in all ecotypes. Changes in seed trigonelline content did not follow a similar trend in different ecotypes. In summary, although biochar prevented the growth and yield reduction by decreasing water deficiency effects, itdid not have any significant effect on seed trigonelline content.
F. Abbaspour; H.R. Asghri; P. Rezvani Moghaddam; H. Abbasdokht; J. Shabahang; A. Baig Babaei
Abstract
A field experiment was conducted focusing on the effects of biochar on quantity characteristics of Black Seed (Nigella sativa L.) under water deficit conditions. The experimental design was split plot factorial in a randomized complete block design with three replications. Three levels of irrigation ...
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A field experiment was conducted focusing on the effects of biochar on quantity characteristics of Black Seed (Nigella sativa L.) under water deficit conditions. The experimental design was split plot factorial in a randomized complete block design with three replications. Three levels of irrigation (I1: 100%, I2: 70% and I3: 40% of water irrigation requirement) were assigned as main plots and the combination of three levels of biochar (B1: 0, B2: 10 and B3:20 t.ha-1) and two levels of chemical fertilizers (F1: without and F2: with chemical fertilizer) were allocated as sub plots. Results were shown that seed number per plant and seed weight per plant significantly increased by 10 t.ha-1 biochar application compared with 20 t.ha-1. Chemical fertilizer significantly affected the yield components of black seed except 1000-seed weight. The interaction between biochar, chemical fertilizer and water requirements significantly affected the seed yield and biological yield. The result revealed that the application of 10 t.ha-1 biochar plus 70% water irrigation requirement and using chemical fertilizer (I2B2F2) produced the highest seed yield and biological yield (1365 and 5776 kg.ha-1, respectively). Application of biochar combined with chemical fertilizers could improve soil nutrient and water availability conditions and increased the yield of black seed.
