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.
F. Helali Soltanahmadi; M.R. Amerian; M. Ghiyasi; H. Abasdokht
Abstract
The use of organic materials and nano-fertilizers to control the release of nutrients could be an effective step towards achieving sustainable agriculture. Drought stress is the most important factor limiting the growth and yield of medicinal plants including marigold (Calendula officinalis L.). This ...
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The use of organic materials and nano-fertilizers to control the release of nutrients could be an effective step towards achieving sustainable agriculture. Drought stress is the most important factor limiting the growth and yield of medicinal plants including marigold (Calendula officinalis L.). This experiment was conducted under field conditions in a factorial arrangement in a randomized complete block design with three replications (replication in place) in the Research Farm of the Urmia and Salmas Agricultural Research Center. The first factor was irrigation method at two levels including normal irrigation and irrigation cut in the beginning of flowering, and the second factor was priming treatments in seven levels including the seeds primed with nano fertilizers (iron oxide, zinc oxide and oxide with concentrations of two in thousands) and the seeds primed with organic material (humic acid, 72 mg/L, salicylic acid 2000 micromole and ascorbic acid 200ppm) and control. The results indicated that the priming of seeds with nano materials and priming with organic materials caused an increased plant height, number of capitol, fresh and dry weight of the plant, fresh and dry weight of root, grain yield, harvest index, essential oil percentage, and mineral phosphorus percentage as well as increased quantitative and qualitative yield of marigold, especially in drought stress conditions. Therefore, its application could be recommended for sustainable and organic agriculture.
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.
