net assimilation

Open Access Article

1 - Growth indices variations of wheat in response to various density and sowing dates of wild oat
farshad abrahimpour

To study the effect of sowing date and density of wild oat on growth and development of wheat an experiment was conducted in randomized complete block in four replications in forms of split-plot in frame of basic design in 2004-2005 and 2005-2006 at Farm Experimental-Re More

To study the effect of sowing date and density of wild oat on growth and development of wheat an experiment was conducted in randomized complete block in four replications in forms of split-plot in frame of basic design in 2004-2005 and 2005-2006 at Farm Experimental-Research Islamic Azad University of Shooshtar, Khouzestan. Treatments including sowing date of wild oat (16, 22, 26 November, 1, 6, 11, 16, 22, and 26 December) as main plot, and six densities (0, 20, 40, 60, 80 and 100 plants m-2) as subplot was conducted in competition with winter wheat on December 6th . The results analysis of growth indices of wheat indicated that with increase growth day degree (GDD), the best status of total dry matter (TDM), crop growth rate (CGR), relative growth rate (RGR), net assimilation rate (NAR), leaf area index (LAI), leaf area ratio (LAR), specific leaf area (SLA) and leaf weight ratio (LWR) belonged to free plots and the latest sowing date (26 December). In addition, by increasing of density or sowing date of wild oat before wheat decreased total dry matter 61 and 70%, crop growth rate 45 and 58%, relative growth rate 57 and 89%, net assimilation rate 92 and 100%, and leaf area index 97 and 100% than density 0 plant m-2 and the later sowing date Manuscript profile

Open Access Article

2 - Investigation Effect of Different Amount and Time of Apply a Bio-Regulator on Growth Indices of Vicia faba L.
Somayeh Ghalandari Tayeb Sakinejad

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Open Access Article

3 - Influence of Chemical and Biological Fertilizers on Agro-Physiological Characteristics of Corn (Zea mays L., S.C. 703)
Felora Shamoradi Seyed Keyvan Marashi

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Open Access Article

4 - Improvement of Physiological Growth Indices and Yield of Soybean (Glycine max L.) by Replacing some of Nitrogen with Phosphorus under Moisture Stress
Farasat Sadeghi Mohammad Ali Aboutalebian

10.30495/jcep.2019.666246

To study some growth indices of soybean under moisture stress by replacing nitrogen with phosphorus, a field experiment was conducted at the Research Station of Bu-Ali Sina University during the 2017-2018 growing season. The experiment was carried out in a split-factori More

To study some growth indices of soybean under moisture stress by replacing nitrogen with phosphorus, a field experiment was conducted at the Research Station of Bu-Ali Sina University during the 2017-2018 growing season. The experiment was carried out in a split-factorial arrangement of treatments based on randomized complete block design with three replications. The main plots consisted of three levels of irrigations (irrigating after 60, 90 and 120 mm evaporation from class A evaporation pan). Two levels of nitrogen replacement with phosphorus and without replacement and two levels of phosphorus replacement and without phosphorus replacement assigned to subplots. The results showed that simultaneous replacing of nitrogen and phosphorus in all irrigation levels increased physiological growth indices of leaf area index, dry matter accumulation, crop growth rate, relative growth rate and net assimilation rate. Moisture stress reduced growth rate of the crop significantly. Results also showed that crop growth rate increased 35 to 45 days after planting and reached to its maximum level after 65 days after planting date. After this period, the crop growth rate of soybean decreased and reached to zero about 95-100 days after planting. The highest dry matter accumulation and crop growth rate were obtained from irrigation after 60 mm evaporation and nitrogen-phosphorus simultaneous placement application. According to the results, simultaneous replacing nitrogen and phosphorus, reduced the negative effect of moisture stress on soybean growth indices. Nitrogen replacement with phosphorus increased grain yield by 11.4% as compared to non-replacement of nitrogen with phosphorus and yielded 3855.88 kg.ha-1. In this research, nitrogen replacement with phosphorus under irrigation after 90 mm evaporation prevented significant oil yield loss as compared to irrigation after 60 mm evaporation. Manuscript profile

Open Access Article

5 - Response of Some Physiological Parameters of Tomato (Lycopersicon esculentum Mill.) Varieties to Manure, Chemical Fertilizer and Their Combined Uses
Sajjad Nasiri Sohrab Mahmoudi Mohammad Ali Behdani Alireza Samadzadeh

To evaluate the effects of manure, chemical fertilizers and their combined uses on yield and some physiological parameters of tomato varieties, an experiment was conducted as split plot in a randomized complete block design with three replications at the Agricultural Fa More

To evaluate the effects of manure, chemical fertilizers and their combined uses on yield and some physiological parameters of tomato varieties, an experiment was conducted as split plot in a randomized complete block design with three replications at the Agricultural Faculty of the University of Birjand in 2014. In this experiment fertilizer with 3 levels (manure, chemical fertilizer and their combined uses) asseigned to main plots and three tomato varieties (Orbana, Super chief and Super majar) to sub plots. Physiological parameters under study were LAI, CGR, RGR and NAR which measured every 10 days after the seedling establishment. The results showed significant effects of fertilizer and varieties on these parameters. The highest leaf area index (3.56) was obtained by the used of chemical fertilizers and the lowest (3) by the application of manure. Orbana possessed the highest LAI (4) and Super chief the lowest LAI (2.78). In this experiment, the highest crop growth rate (CGR) belonged to Orbana by the use of combined application of fertilizers and the lowest to Super Chief by the use of manure. Plants treated with chemical fertilizer had the highest relative growth rate (RGR) and those treated with their combined application and manure stood in the lower categories. The highest total tomato yield was related to the use of chemical fertilizer and the lowest to the use of combined fertilizers. The results of this experiment can be used to emphasize the role of organic fertilizers to produce highest tomato yield, both in quantity and quality, in this region and other similar regions in the country. Manuscript profile

Open Access Article

6 - Yield Comparison of Sesame Cultivars and Their Physiological Growth Indices Under Chemical and Biological Potassium Fertilizer Applications
Hamid Madani Behzad Sani Hamid Golipour

To compare the yield and physiological growth indices of three Iranian sesame cultivars under the application of chemical and biological potassium fertilizers a pot experiment was conducted in the summer of 2015 in greenhouse. This study was performed as factorial arran More

To compare the yield and physiological growth indices of three Iranian sesame cultivars under the application of chemical and biological potassium fertilizers a pot experiment was conducted in the summer of 2015 in greenhouse. This study was performed as factorial arrangement based on a randomized complete block design with three replications. The potassium fertilizer application, based on soil test, was in four levels (K1:K2SO4 50%, K2: Bacillus circulans L., K3: Bacillus megatherium L. and K4: KSB1+KSB2 and three sesame cultivars used were Ultan, Yekta and Dashtestan 2. The plant samples were taken from 30 to 105 days after sowing with 15 days intervals. LAI, TDM, CGR, NAR and RGR were measured during the different growth stages. The results showed that the Yekta cultivar produced the highest seed yield (18.62 g.plant-1). Ultan produced highest growth rate as compared to the other cultivars. Furthermore, it responded differently to the application of biologic KSB1 fertilizer as compared to the other treatments and cultivars. KSB1 improved and accelerated plant growth rate at 90 days after sowing. While, the use of chemical potassium sulfate, KSB2 and combined application of Bacillus circulans L. with KSB1 and 2 improved growth 105 days after sowing. Manuscript profile

Open Access Article

7 - Interactive effect of planting date and variety on agronomical characterestics and incidence of blast disease in rice replanting (Oryza sativa L.)
Allahyar Fallah*1 Alireza Nabipour2 Abdulreaza Ranjber3

In recent years, two times cultiviation in year, or rice replanting, has gained popularity in Haraz watershed basin. In order to determine the interactive effect of planting date and variety on growth index, yield, yield components, and percent of blast desease in Tarom More

In recent years, two times cultiviation in year, or rice replanting, has gained popularity in Haraz watershed basin. In order to determine the interactive effect of planting date and variety on growth index, yield, yield components, and percent of blast desease in Tarom Mahali, Binam and Koohsar varieties in replanting cultivation, a field experiment was carried out at the Deputy of the Rice Research Institute of Iran, Mazadaran branch (Amol), in 2015 and 2017.Experiment was laid out as a split plot base complety random block design with three replications, where planting dates, as main plot, included 24 July, 2 and 12 AugustandTarom Mahali, Binam and Koohsar varietieswere put in sub-plots.Plot size was 3×4 m2 with a plant spacing of 20×20 cm2, and 2-3 seedlings per hill.Agronomical characterestics were measured at three growth stages, namely maximum tillering, flowering and physiological maturity. Results showed that tiller and panicle number per hill was higher in third planting date. SPAD value was affected by variety and Koohsar had highest SPAD value in all planting dates. Highest crop growth and net assimilation rate was obtained in Koohsar variety at flowering satge. The Highest yield was obtained in the second planting date for Koohsar and Binam varieties, though percent of blast disease incidence was higher as well. The higher yield of Koohsar variety could be attributed to having higher grain weight and harvest index compared to Tarom Mahali variety. Based on the results, best planting date would be from 2 to 12 August of in Haraz watershed basin. Manuscript profile

Open Access Article

8 - Evaluation of canola growth parameters under different residues management of rice in Izeh weather condition
Seyed Keyvan Marashi Hamid Amanipor

This experiment was performed to investigate the effect of different rice residue management on growth parameters of canola. This experiment was performed as a split plot experiment in the form of a randomized complete block design with three replications in the agricul More

This experiment was performed to investigate the effect of different rice residue management on growth parameters of canola. This experiment was performed as a split plot experiment in the form of a randomized complete block design with three replications in the agricultural lands of Izeh city. The studied treatments include rice residue management at four levels (including 1- conventional cultivation (stubble burning), 2- cultivation in plowed land with rice residues, 3- cultivation in rice residues with a height of 20 cm, 4 - cultivation in rice residues with a height of 40 cm) and the second factor was three canola cultivars (including 401, 4815 and okapi). The results showed that the effect of rice residue management on leaf area index, total dry matter, crop growth rate, relative growth rate and net assimilation rate were significant. The effect of cultivars were significant in all measurement traits. There was no significant difference interaction between rice residue management and cultivar type on all studied traits. The maximum and minimum values in the studied traits were observed in cultivation management in cultivation in plowed land with rice residues and conventional cultivation, respectively and among different canola cultivars, the maximum and minimum values in the traits were observed in cultivar 4815 . In general, the results of the experiment showed that the cultivation in plowed land with rice residues is superior to conventional cultivation and other managements and leads to the improvement of growth parameters. Also, 4815 cultivar is superior to 401 and okapi cultivars. Manuscript profile

Open Access Article

9 - Modification of some growth indices in wheat under water deficit conditions
Hamid Dehghanzadeh manouchehr jam negad

The experiment was conducted during 2004-2006 growing seasons at the Agricultural Research Station, Islamic Azad University, Naragh Branch, to evaluate the effects of water deficit on growth indices of three bread wheat (Triticum aestivum L.) cultivars. A split plot exp More

The experiment was conducted during 2004-2006 growing seasons at the Agricultural Research Station, Islamic Azad University, Naragh Branch, to evaluate the effects of water deficit on growth indices of three bread wheat (Triticum aestivum L.) cultivars. A split plot experiment based on a randomized complete block design with four replications was used in both years. Irrigation treatments (irrigation after 70 (I1), 90 (I2) and 110 (I3) mm of cumulative evaporation from class A evaporation pan) were considered as the main plot and wheat cultivars (Mahdavy, Sepahan and Roshan-back cross) as subplots. Irrigation after 70 and 90 mm cumulative evaporations did not modify growth indices, significantly. Delay in irrigation from 90 to 110 mm cumulative pan evaporation significantly reduced the growth indices. Pattren of changes in leaf area index (LAI), total dry matter (TDM), net assimilation rate (NAR), and crop growth rate (CGR) were similar in both 70 and 90 mm treatments. At samplings, delay in irrigation from 90 to 110 mm cumulative evaporation lowered the incraese of all growth indices. Pattern of changes in CGR was more similar to LAI but dissimilar to NAR. The results indicated that 22% water could be saved when wheat plants were irrigated after 90 mm of cumulative pan evaporation. However, a decrease of growth indices and grain yield under this water condition was not important. Manuscript profile

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