List of Articles Leaf color

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  1 - پیش‌بینی مراحل نمو گل رز شاخه بریده و تنوع رنگ برگ به کمک روش آنالیز تصویر
  Mansour Matloobi سپیده طهماسبی محمد رضا دادپور
  پیش­بینی مراحل رشد محصول، به­خصوص زمان برداشت آن نقش بسیار  مهمی در برنامه­ریزی تولیدات گلخانه­ای دارد. مطالعات فراوانی از کاربرد  فن­آوری تجزیه و تحلیل تصاویر دیجیتال برای تخمین رفتار رشدی محصول در گلخانه وجود دارد. در مطالعه حاضر تغییرات More

  پیش­بینی مراحل رشد محصول، به­خصوص زمان برداشت آن نقش بسیار  مهمی در برنامه­ریزی تولیدات گلخانه­ای دارد. مطالعات فراوانی از کاربرد  فن­آوری تجزیه و تحلیل تصاویر دیجیتال برای تخمین رفتار رشدی محصول در گلخانه وجود دارد. در مطالعه حاضر تغییرات مشخصات رنگی برگ  چهار رقم  تجاری گل رز در طول زمان با استفاده از پردازش تصاویر رنگی توسط نرم­افزار image j و فضای رنگ RGB مورد بررسی قرار گرفت. نتایج حاصل  نشان داد که ارتباط بالایی بین اجزای رنگ برگ و مرحله رشد ساقه در ارقام دارای گل­های سفید رنگ (R2 = 0.986) و ارقام گل رنگی (R2 = 0.94) وجود دارد و همچنین تفاوت معنی­داری بین اجزای رنگ در برگ­های لایه­های مختلف ساقه مشاهده شد. همچنین همبستگی خوبی بین اندازه­گیری مستقیم کلروفیل کل توسط روش اسپکتروفتومتری و شاخص کلروفیل به وسیله SPAD بدست آمد. در بین مدل­های بررسی شده معلوم شد مدل خطی و مدل نمایی عملکرد بهتری در ایجاد رابطه منطقی بین داده­های حاصل از ارتفاع ساقه و تغیرات رنگ برگ دارند، هرچند تفاوت­هایی در این زمینه بین ارقام مشاهده شد. توانایی روش آنالیز تصویری در تشخیص غیر مخرب تغییرات رنگی در بین لایه­های برگی و برقراری یک پیوند معنی­دار و منطقی بین تغییرات رشد ساقه ارزشمند و در خور توجه تشخیص داده شد. توسعه این مدل برای سایر ارقام رز گلخانه­ای مهم می­تواند ابزار قوی و قابل اطمینانی در اختیار تولید کنندگان رزهای گلخانه­ای قرار دهد تا بتوانند به کمک آن برنامه­های تولید را تنظیم و زمان برداشت محصول و بازاررسانی را پیش­بینی کنند.  Manuscript profile
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  2 - Evaluation effects of different temperature levels and duration on seedling growth of five rice varieties
  A. Fallah M. Abdi Najad Kshtly H. Elyasi
  The main cold damage occurs in germination and seedling growth stages. To examine the effect of cold stress effects on rice seedling growth was carried out a greenhouse experiments in Deputy of Rice Research Institute in Mazandaran (Amol) since 2010. The basic design wa More

  The main cold damage occurs in germination and seedling growth stages. To examine the effect of cold stress effects on rice seedling growth was carried out a greenhouse experiments in Deputy of Rice Research Institute in Mazandaran (Amol) since 2010. The basic design was conducted a completely randomized with split plot factorial experiment in 3 replicates with different temperature levels (10, 13, 16, 32 ° C) and its duration (1, 2, 3, 4, 5 days) on five varieties of rice (Dialam, line 843, Tarom, Fajr, Shiroudi). The varieties were designed as main plot and and temperature levels  and duration of thermal treatment in sub-plot. The seedlings were placed in normal growth conditions until the 3-2 leaf stage seedlings age (12-8 days) and then transferred to a growth chamber and were treated at 10, 13, 16 ° C for 1, 2, 3, 4 and 5 day. After the treatment, four seedlings from each replicate were selected and growth characters such as height, seedling dry weight (dry weight of shoot + root), sensitivity index, leaf area and color were measured. Results showed that among the varieties, the stress intensity, stress duration and their interaction effects were a significant probability of 1% for all traits in the seedling stage in which reflects the severity and duration of cold stress on the varieties is discussed. Low temperatures were reduced, the growth rate of seedlings up to 10 -50% compared with control treatment. Low temperatures (10 oc) were decreased new roots production and seedling dry weight in which 60% reduction compared to 32oc treatment. Temperature was caused discoloration of lamina and the color of the leaves of rice seedlings after exposure to cold stress conditions could be concluded, each variety is greener leaf color of seedlings with less damage and is more tolerant to cold. Tarom and Shiroudi varieties compared to other varieties more tolerant to cold stress, however, Fajr variety was more sensitive.  Manuscript profile
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  3 - Evaluation effects of different temperature levels and duration on seedling growth of five rice varieties
  A. Fallah M. Abdi Najad Kshtly H. Elyasi
  The main cold damage occurs in germination and seedling growth stages. To examine the effect of cold stress effects on rice seedling growth was carried out a greenhouse experiments in Deputy of Rice Research Institute in Mazandaran (Amol) since 2010. The basic design wa More

  The main cold damage occurs in germination and seedling growth stages. To examine the effect of cold stress effects on rice seedling growth was carried out a greenhouse experiments in Deputy of Rice Research Institute in Mazandaran (Amol) since 2010. The basic design was conducted a completely randomized with split plot factorial experiment in 3 replicates with different temperature levels (10, 13, 16, 32 ° C) and its duration (1, 2, 3, 4, 5 days) on five varieties of rice (Dialam, line 843, Tarom, Fajr, Shiroudi). The varieties were designed as main plot and and temperature levels  and duration of thermal treatment in sub-plot. The seedlings were placed in normal growth conditions until the 3-2 leaf stage seedlings age (12-8 days) and then transferred to a growth chamber and were treated at 10, 13, 16 ° C for 1, 2, 3, 4 and 5 day. After the treatment, four seedlings from each replicate were selected and growth characters such as height, seedling dry weight (dry weight of shoot + root), sensitivity index, leaf area and color were measured. Results showed that among the varieties, the stress intensity, stress duration and their interaction effects were a significant probability of 1% for all traits in the seedling stage in which reflects the severity and duration of cold stress on the varieties is discussed. Low temperatures were reduced, the growth rate of seedlings up to 10 -50% compared with control treatment. Low temperatures (10 oc) were decreased new roots production and seedling dry weight in which 60% reduction compared to 32oc treatment. Temperature was caused discoloration of lamina and the color of the leaves of rice seedlings after exposure to cold stress conditions could be concluded, each variety is greener leaf color of seedlings with less damage and is more tolerant to cold. Tarom and Shiroudi varieties compared to other varieties moretolerant to cold stress, however, Fajr variety was more sensitive. Manuscript profile
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  4 - Determination of nitrogen fertilizer requirement on sorghum based on leaf color chart
  Ali Izi Mohammad Armin Esmaiel Filekesh
  Nowadays, implementation of simple and efficient methods for determining nitrogen needs has been considered in various plants. The simplest and most efficient methods for appreciate nitrogen requirement determination is leaf color chart (LCC). To determine of nitrogen f More

  Nowadays, implementation of simple and efficient methods for determining nitrogen needs has been considered in various plants. The simplest and most efficient methods for appreciate nitrogen requirement determination is leaf color chart (LCC). To determine of nitrogen fertilizer requirement in forage sorghum using leaf color chart, an experiment was conducted as factorial arrangement based on complete randomized block design with three replications at Agriculture and Natural Resources Research Station of Sabzevar in 2012 growing season. The factors were nitrogen rate in four levels including conventional (150), 25, 50, and 75 kg.ha-1 N and LCC scores was less than 4 and 5. The highest plant height, leaf dry weight, number of leaves per plant, biological yield and protein percentage were obtained in 75 and 50 kg.ha-1 nitrogen application. Using different amounts of nitrogen with reduction of LCC to 5 led to higher plants, more leaf dry weight, leaf numbers per plant, biological yield and protein content than using nitrogen with reduction of LCC to 4. On the whole, 50 kg.ha1 nitrogen with reduction of LCC to 5 was the best treatment for the highest quantity and quality yield achievement for forage sorghum. Also, LCC can be applied easily to determine sorghum nitrogen equipment. Manuscript profile
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  5 - Effect of aeration and topdressing on quantitative and qualitative traits of Lolium grass
  Mahboubeh Ghazali Mohammad Reza Nouri Abouzar Rahmati
  Traffic and over irrigation cause to compress soil in lawn area. Soil compaction considered is undesirable because it reduces hydraulic conductivity and water infiltration and increase evaporation in soil surface. The foctorial experiment was conducted to evaluate effec More

  Traffic and over irrigation cause to compress soil in lawn area. Soil compaction considered is undesirable because it reduces hydraulic conductivity and water infiltration and increase evaporation in soil surface. The foctorial experiment was conducted to evaluate effect of aereation (punching 1 cm diameter holles on the surface in a regular grid pattern) and topdressing techniques on lolium grass.We initialed aeration in 3 level (5×5, 10×5 cm spacing and no aeration) and 2 level topdressing (with topdressing and without topdressing) with sand and compost were performed to investigate their influence on grow of luliom lawn in the city of Isfahan in june 2010. Height and weight of grass, rate of leaf color and leaf density were measured in 3 times 10, 70 and 130 days after aeration and topdressing. Results show that weight, height and color of lawn leaf significantly greater with topdressing. The aeration with 10×5 cm spacing with topdressing was highest infiltration, in addition, weight, height and color of the lawn leaves rate increased compared to control treatment. The results can be advised for maintaining acceptable weight, height and color grass leaves is sufficient. lawn Aeration only, recommended in flood area to control runoff and further intake to soil. Manuscript profile