In order to evaluate the effect of foliar application of humic acid on yield and yield components of red bean cultivars this experiment was conducted at Agricultural Research Station of Arak in 2014. The experiment was in split plots Completely Randomized Block Design (CRBD) with three replications. Three level of humic acid i.e. 0, 1.5 and 3 liters per hectare in main plots and three cultivars of red bean i.e. Derakhshan, Goli and D81083 were in sub plots used as treatments. Results of study revealed that line D81083 along with 3.0 liters per hectare of humic acid application shows superiority over the other treatments and showing 13622 kg per hectare final biomass yield. Among various tested cultivars, the lowest biomass yield (10311.1 kg/hectare) was obtained from Derakhshan cultivar without humic acid application. Further, amongst various tested doses of humic acid, highest seed yield (4253.7 kg/hectare) was reported from the cultivar line D81083 at 1.5 liter per hectare of humic acid application while the lowest yield obtained in Derakhshan without humic acid. Results of current study revealed relationship between bean cultivars and humic acid application and interaction of these two affect the yield and yield attributes of red bean.
This experiment was carried out to evaluate the effect of halt irrigation and bio fertilizer on plant yield, seed nutrients content, relative water content (RWC) and chlorophyll index (SPAD) of Goli genotype of red bean (Phaseolus vulgaris L.), based on split plot design with three replications during two years of 2014-2015 at Arak, Iran. Halt irrigation was in main plots by four levels of control (full irrigation), halt irrigation in vegetative stage, at flowering stage and pod filling stage and four bio fertilizer were in sub plots, including: control (no bacteria), Phosphorus Solublizing bacteria (PSB), potassium solublizing bacteria (KSB) and concurrent use both of PSB and KSB. Analysis of variance showed that no significant effect of years but the effect of halt irrigation treatments was significant on plant yield, N, P, K and Zn percentage of seed, relative water content (RWC) and chlorophyll index (SPAD). Halt irrigation reduced plant yield by 67.81% in comparison to full irrigation during flowering stage. In the study, physiological characteristics such as RWC, N, P, K and Zn contents were also reduced significantly with halt irrigation at flowering stage than its effects on other stages of the crop. Also other characteristics was significantly reduced in this study with halt irrigation that this reduction in flowering stage was more than other stages.
Drought stress and oxidative damage are among the most important factors that limit the growth and yield of drought crop plants. The global climate change has led us to adapting planting dates and select tolerant cultivars to encounter the new climatic conditions. To evaluate the effect of late-season drought stress under different planting dates on rapeseed cultivars, a 2- year field experiment was conducted as a factorial split-plot based on randomized complete block design (RCBD) in Karaj - Iran, from 2015 to 2017. Irrigation treatments were considered in the main plots and planting dates and cultivars as factorial were placed in subplots. Two planting dates were regular date (September, 26) (PD1) and late planting date (October, 26) (PD2). Irrigation was also carried out at two levels of normal irrigation (NI) and irrigation cut-off (II) from the pod formation stage onwards. Rapeseed cultivars included Tassilo, Elvise, Neptune and Okapi. Late-season drought stress and delayed planting date reduced anthocyanin (AN), guaiacol peroxidase (GPX) activity, and grain yield (GY), but increased malondialdehyde (MAD), in all rapeseed cultivars. The highest GY (3346.6 kg ha-1) was obtained in NI conditions and PD1. According to the results of stepwise regression, AN, GPX, and MAD with a coefficient of determination (R²=0.774) explained about 78% of the changes in the GY, among which MAD with a value of (-0.72) showed the greatest negative and significant impact on the GY. Therefore, Elvise can be introduced as a superior cultivar to be selected as a genotype that presents acceptable resistance under drought stress and late sowing in arid and semi-arid regions.
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