Vajiheh Amini Mandi; Ali Nakhzari Moghaddam; ali Rahemi karizaki; Masoumeh Naeemi
Abstract
This study is conducted to investigate the influential factors on rice yield gap in the Joibar Region, located in Mazandaran Province, by means of two methods of boundary line analysis and comparative performance analysis, in the cropping years of 2017-18 and 2018-19. It is carried out through fieldwork ...
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This study is conducted to investigate the influential factors on rice yield gap in the Joibar Region, located in Mazandaran Province, by means of two methods of boundary line analysis and comparative performance analysis, in the cropping years of 2017-18 and 2018-19. It is carried out through fieldwork and face-to-face interviews with farmers, for which purpose, totally 120 rice fields located in the studied geographical area in each crop year have been selected in such a way that they had sufficient diversity in terms of location and time. In the comparative performance analysis method, the relation between yield and all measured quantitative and qualitative variables are examined, using multiple regression method. According to the suggested protocol in the boundary line analysis method, a boundary line is fitted to the data in the data distribution diagram. Results show that according to the yield comparative performance analysis model, the yield gap of Joibar rice fields has been 1842 kg/ha, and the harvest date has played the most important role in rice yield gap. Also, according to the findings of border line analysis, the yield gap of rice fields in this region has been 874 kg/ha with the biological control being the most important factor in rice yield gap. Therefore, continuous monitoring and evaluation of crop management on farmers' fields and its identification is essential to eliminate yield gaps along with the management factors causing them.
Atefeh Sadat Mousavi; Masoumeh Naeemi; ali Rahemi karizaki; Abdolatif Gholizadeh
Abstract
In order to investigate the effect of chitosan and salicylic acid elicitors on osmotic adjustment and some physiological traits of Hyssop under experimental drought conditions, an experiment has been carried out as a split plot design with randomized complete block design with three replications at research ...
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In order to investigate the effect of chitosan and salicylic acid elicitors on osmotic adjustment and some physiological traits of Hyssop under experimental drought conditions, an experiment has been carried out as a split plot design with randomized complete block design with three replications at research farm of Gonbad Kavous University during 2018-2019. Irrigation factor at three levels include 7, 14, and 21 days irrigation interval as main factor and four levels of spraying including no elicitor (control treatment, spraying), salicylic acid (300 mg. l-1), Chitosan spraying (5 g. l-1), and combination of salicylic acid and chitosan, considered as auxiliary agents. Results of analysis of variance show that the interaction between spraying and irrigation has had significant effects on ion leakage, chlorophyll a content, soluble sugar, and malondialdehyde content but insignificant impacts on carotenoid and essential oil yield. Spraying of salicylic acid, with 17% reduction in ion leakage and 40% reduction in plant malondialdehyde, compared to the control, increase the stability of cell membranes under 21-day irrigation stress. In the same treatment, chitosan has increased the amount of photosynthetic pigments and total chlorophyll by 51%, compared to the control. According to the results, salicylic acid and Chitosan have been able to increase the ability of hyssop in response to water deficit stress by activating different tolerance mechanisms.
Mahdieh Amirinejad; Gholamali Akbari; Amin Baghizadeh; Iraj allahdadi; Maryam Shahbazi; Masoomeh Naimi
Abstract
To determine the effects of drought stress and foliar application of zinc and iron on some biochemical parameters of cumin (Cuminum cyminum L.), a greenhouse experiment was carried out at Graduate University of Advanced Technology of Kerman, Iran during 2011-2012. The experiment was conducted in factoriel ...
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To determine the effects of drought stress and foliar application of zinc and iron on some biochemical parameters of cumin (Cuminum cyminum L.), a greenhouse experiment was carried out at Graduate University of Advanced Technology of Kerman, Iran during 2011-2012. The experiment was conducted in factoriel design based on randomized completely block with three replications. Three levels of water deficit 70 (well- watered), 50 and 30 (moderate and severe stress) percent of field capacity with treatments of Zn, Fe, Zn+Fe (5/1000) and non-foliar application (water) were used. Results show positive effects of iron and zinc foliar application under drouth stress on some biochemical parameters of cumin. Maximum quantities of total protein and proline (4.12 and 364.52 mg/gr Fw) and maximum quantities of soluble sugar (5.62 mg/gr Dw) were observed in severe stress with Zn+Fe treatment. Also zinc and iron foliar application decresed malondealdohide (9.16 and 5.06 µM/gr Fw) in moderate and severe stress conditions in cumin leaf, respectively. Drought stress and foliar application increased enzymes activities. Maximum quantities of enzymes activities (catalase: 28.51, gayacol peroxidase: 284.75 and superoxid dismutase: 50.99 U/mg protein) in leaves were observed in severe stress with Zn+Fe treatment too. According to our results, iron and zinc foliar application improves biochemical parameters in cumin under drouth stress.
Masoumeh Naeemi; Gholam Ali Akbari; Amir Hosein Shirani Rad; Tahere Hasanloo; Gholam Abbas Akbari; Mahdieh Amirinejad
Abstract
In order to evaluate the effect of zeolite application and selenium spraying on some physiological traits and grain yield in medicinal pumpkin (Cucurbita pepo L.) under different moisture regimes, a study was conducted in a factorial experiment based on randomized complete block design with three replications ...
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In order to evaluate the effect of zeolite application and selenium spraying on some physiological traits and grain yield in medicinal pumpkin (Cucurbita pepo L.) under different moisture regimes, a study was conducted in a factorial experiment based on randomized complete block design with three replications during 2010 in Takestan at Gazvin province, Iran. The three levels of irrigation factors including normal irrigation based on 60mm evaporation from class A pan (control), withhold irrigation at the flowering and fruit formation stages, zeolite factors including two levels of non-application and use of 10 tons per hectare and selenium was sprayed at two concentration in zero and 30 grams per liter per hectare. The results showed that water deficit stress decreased stomatal conductivity, carotenoid content, chlorophyll a, total chlorophyll, grain yield and increased proline concentration and chlorophyll b content. Zeolite application of 10 tons per hectare under water deficit stress conditions had desirable effect on chlorophyll a and chlorophyll b content and grain yield, also improved traits as stomatal conductivity and reduced proline concentration. The highest grain yield (1329 kg.ha-1) was obtained with zeolite and selenium application together at normal irrigation conditions. According to the results, it seems that application of zeoilite and selenium in areas that are subjected to water deficit stress can be useful in improving plant growth and production.
Masoomeh Naeemi; Gholam Ali Akbari; Amir Hossein Shirani Rad; Tahereh Hassanlou; Gholam Abbas Akbari
Abstract
In order to evaluation the effect of zeolite application and selenium spraying on water relations traits and antioxidant enzymes in medicinal pumpkin (Cucurbita pepo L.) at water deficit stress conditions, an experiment was conducted in factorial based on randomized complete block design with three replications ...
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In order to evaluation the effect of zeolite application and selenium spraying on water relations traits and antioxidant enzymes in medicinal pumpkin (Cucurbita pepo L.) at water deficit stress conditions, an experiment was conducted in factorial based on randomized complete block design with three replications during 2010 in Takestan, Iran. The three levels of irrigation factor include normal irrigation (control), withhold irrigation at the flowering and fruit formation stages, zeolite factors include two levels of non application and use of 10 tons per hectare and selenium was sprayed at two concentration in zero and 30 grams per liter per hectare. Water deficit increased antioxidant enzymes activity, so that the increase in stressed plants at flowering stage was among the most prominent. Selenium spraying increased the anti-oxidative activity. Zeolite application of 10 tons per hectare, reduced stress effects and improved traits as RWC, WSD, soluble protein content, number of seeds, 100 seed weight and oil yield. According to the results, application of zeoilite under drought stress condition retain the moisture during stress and can be useful in improving plant growth and production.
Masoumeh Naeimi; Gholam Ali Akbari; Amir Hossein Shirani rad; Seyed Ali Mohammad Modarres-Sanavy; Seyed Ahmad Sadat nouri
Volume 12, Issue 2 , November 2010, , Pages 63-71
Abstract
To evaluate the drought stress effect at terminal growth stage on yield of 12 rapeseed cultivars, an experiment was conducted with split-plot arrangement based on randomized complete block design with four replications at experimental field of Seed and Plant Improvement Institute, Karaj-Iran during 2005-06. ...
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To evaluate the drought stress effect at terminal growth stage on yield of 12 rapeseed cultivars, an experiment was conducted with split-plot arrangement based on randomized complete block design with four replications at experimental field of Seed and Plant Improvement Institute, Karaj-Iran during 2005-06. Irrigation at two levels (irrigation after 80 mm evaporation from class A pan, as control and withholding irrigation from silique formation until crop maturing time, as stress conditins allowcated to main plots and twelve rapeseed cultivars were used in sub plots. The number of silique in main stem, number of silique in lateral branches, silique fertility ratio and grain yield were low in drought stress conditions (p< 0.05). There were significant variations in all studied traits between evaluated cultivars. Grain yield in drought stress treatment was decreased (30%), when silique abortion was occurred due to water stress. In full irrigation treatment (control), the grain yield of Orient cultivar (2817 kg.ha-1) and at drought conditions, the grain yield of Opera cultivar (2058 kg.ha-1) were the highest amounts. The lowest oil percentage (39.8) and the highest protein percentage (23.3) were for Talaye cultivar, while the highest oil percentage (42.6) was for Option500 cultivar.