25 research outputs found
Evaluation of yield and some of physiological indices of potato cultivars in relation to chemical, biologic and manure fertilizers
In order to evaluate yield and
some of physiological indices of potato
cultivars in relation to different kinds of
manures, strip plot layout within a
randomized complete block design with
three replications was used. Three levels of
fertilizer were included manure (t/ha) (20,
40 and 60 t/ha), biologic fertilizer (ml/ha)
(0, 100 and 200 ml/ha), and chemical
fertilizer (kg/ha) (175, 350, and 525 kg/ha).
Cultivars were Marfona, Maradona and
Ramus. Marfona had obtained the maximum
plant height, total dry matter, LAI, tuber
yield, dry matter of tuber, the number of
tuber and tuber weight. Application of
60 t/ha manure fertilizer together with
Marfona produced the highest yield. In this
experiment, fertilizer showed significant
effects on potato cultivars yield and
physiological indices. Marfona and Ramus
had obtained the highest and the lowest total
dry matter, respectively. The maximum LAI
was related to application of 60 t/ha manure
fertilizer, and the minimum one was
obtained for application of 40 t/ha manure
fertilizer. In cultivar treatments, the highest
LAI was obtained for Marfona, followed by
Maradona and Ramus. The maximum and
the minimum crop growth rate (CGR) was
related to chemical and biological fertilizer,
respectively. The maximum CGR was
related to Marfona, than those of other
cultivars. There were not any significant
differences among different fertilizers in net
assimilation ratio (NAR), fertilizer levels
and various cultivars. Thus, it can ve
suggested that in order to increasing yield,
total dry matter, crop growth rate and other
physiological indices should be applied
60 t/ha manure fertilizer with Marfona
cultivar in Fereydan region of Esfahan, Iran
Evaluate germination and seedling growth of three cultivars of fennel under diatomite and soil management
Fennel is a plant belonging to the Apiacea (Umbelliferae) family, and used by humans for a long time for medicinal purposes. In order to evaluate the influence of different materials on germination and seedling growth of three cultivars of fennel, an experiment was
conducted in 2018. The cultivars of fennel were Isfahan, Yazd, and Shiraz in main
plots, and three materials including 100% soil, 50% diatomite + 50% soil, and 100% diatomite in subplots, were analyzed in a split plot experiment based on a randomized complete block design (CRBD) with three replications. The highest total germination percentage, coefficient of velocity of germination, epicotile length, fresh epicotile weight
and dry epicotile weight was related to Isfahan. The maximum speed of germination, mean germination time, fresh length and dry leaf weight was achieved in Shiraz cultivar. The higher values of total germination percentage, speed of germination and mean
germination time were related to 100% soil, while application of 50% of soil + 50% of diatomite had obtained the maximum values of radicle length, epicotile length, fresh epicotile weight, dry leaf weight and dry epicotile weight. The maximum values of coefficient of velocity of germination and fresh leaf weight was achieved in application of
100% diatomite. It seems that application of 50% soil + 50% diatomite and Isfahan
and Shiraz cultivars have a great potential of seed germination of seedling growth
The impact of soil amendment of super absorbent polymer on grain yield and yield components of corn in center of Iran
Corn is one of the most important cereal crop grown in Iran. A complete randomized design with four replications was used to analysis the influence of soil amendment of super absorbent polymer on grain yield and yield components of corn in center of Iran
in 2016 and 2017. Treatments with super absorbent polymer were 0 kg/ha (S1), 15 kg/ha (S2), 30 kg/ha (S3), and treatments with fertilizers were 50% (F1), 75% (F2), 100% (F3), which could be combined into nine pots. The influence of super absorbent polymer was significant on spike weight in 2017, above-ground biomass in 2016, one hundred seed
weight in 2016, and grain yield in 2017. There was no meaningful influence of super absorbent polymer on spike weight in 2016, above-ground biomass in 2017, 100 seed weight in 2017 and grain yield in 2016. Fertilizer treatments had significant influence on spike weight, above-ground biomass, 100 seed weight, and grain yield in both 2016 and 2017. The interaction between SAP and fertilizers had significant effect on above ground biomass in 2017. In both years, the highest spike weight, above ground biomass, 100 seed weight and grain yield was related to S3 (30 kg/ha), followed by S2 (15 kg/ha) and S1 (0 kg/ha), respectively. 100% application of fertilizer (F3) had obtained the maximum spike weight, above ground biomass, 100 seed weight and grain in both 2016 and 2017.
Our data have shown that the applied SAP had a remarkable effect on corn growth and yield under different fertilization treatments, and its application of 30 kg/ha gave the best corn production index
Survey the allelopathic effects of tobacco (Nicotiana Tabacum L.) on corn (Zea Mays L.) growth and germination
Allelopathy is the direct
influence of chemical released from one
plant on the development and growth of
another plant. The trial accomplished in
seed technology laboratory of Faculty of
Agriculture, Islamic Azad University of
Isfahan, in 2018. A factorial layout within
completely randomized design with four
replications was used. Treatments
included plant organs extract (leaf, stem,
root and total plant), and different tobacco
extract densities includes four levels of
0%, 25%, 50% and 100%. Control
treatment (0% of tobacco extract) had
obtained the highest value of germination
rate, germination percentage, coleoptile
weight, radicle weight, radicle length and
coleoptile length. The maximum
germination rate, germination percentage,
coleoptiles weight, radicle weight, radicle
length and coleoptiles length was related
to extract of stem extract which had
meaningful differences with other
treatments. Both radicle and coleoptile
length decreased with increase in
concentration of tobacco extract. Tobacco
extract has negatively effects on corn
seeds by decreasing the germination rate.
Tobacco may increase the presence of
secondary metabolites, such as alkaloids,
all of which may have different effects on
seed germination percentage. The highest
germination percentage (91.91%),
coleoptile weight (0.046 mg), radicle
weight (0.0161 mg), radicle length (7.24
mm), and coleoptiles length (6.45 mm)
was related to interaction between control
treatment (0% of extract) and stem
extract. It is concluded that the extract of
Nicotiana tabacum had both inhibitory
and stimulatory effects on seedling
growth of Zea mays
The role of pretreatment parameters on seed germination and seedling growth of two fennel cultivars
Fennel is one of the most important medicinal and spice plants and has become one of the most important economical medicinal plants in Mediterranean, and the Middle East. The germination ability and percentage are fundamental characteristics which
influence the viability of the plants. Prechilling has meaningful influence on coleoptile length, radicle length, seedling length, germination percentage, mean time for germination and germination rate, but uniformity of seed germination did not significantly influenced by it. The cultivar effect was significant on coleoptile length, radicle length, seedling
length, germination percentage and germination rate. However, mean time for germination and uniformity of seed germination did not significantly affected by cultivar. All experimental characteristics, except uniformity of seed germination, significantly influenced by hormone. The maximum coleoptile length, radicle length, seedling length,
germination percentage and germination ratio was related to 45 days moist prechilling treatment. Isfahan cultivar also had obtained the highest coleoptile and radicle length, seedling length, germination percentage and germination ratio compare to Shiraz cultivar. It seems that application of endogenous GA3+KI and BA+KI concentration, which is
provided mostly by chilling treatment, is the most effective factor for breaking the seed dormancy. On the basis of the results, usage of 45 days moist prechilling accompanied with application of GA3+KI and BA+KI in Isfahan cultivar was appropriate
Cultivation of cotton in China and Iran with considering biological activities and its health benefits
Cotton (Gossypium L.) is one of the most important commercial crops and it is famous as white gold. Cotton has a diversity of applications, principally medicinal and many other
usages, such as pigments, derivatives for cattle feed, different uses of the oil extracts and etc. Cottonseed oil has a ration of 2:1 of polyunsaturated to saturated fatty acids and generally consists of 65-70% unsaturated fatty acids, including 18-24% monounsaturated
(oleic) and 42-52% polyunsaturated (linoleic), and 26-35% saturated (palmitic and stearic). The most important health benefits of cotton is treat respiratory diseases, treat skin problems, treat wounds, beneficial for breastfeeding mothers, a good cure for rat bite, an
appropriate cure for scorpion bite, for joint and eye pains, for swollen legs, for removing bacteria in teeth, and alternative medicine for various diseases such as cancer, HIV and etc. Cotton seed oil mostly extracted from Gossypium hirsutum and Gossypium herbaceum, that are also grown for cotton fiber and animal feed. Gossypol is one of the most effective ingredients, both in traditional pharmaceutical practices and alternative
modern medicinal preparations. It is a toxic polyphenolic bisesquiterpene, which may have antifertility and antiviral properties. The obtained findings suggest potential of cotton as a natural resource in pharmaceutical industries
Considering soil water content, nutrients movement, phenology and plant growth with reference to development of functional foods in a lysimeter study
Lysimeter is equipped with mechanisms for weighing by load cells enable automated measurements, and the signals resulting from weight changes in the system due to evaporation that are generally recorded in a data acquisition system. According to methods of measuring water content, lysimeters may be divided into weighing lysimeter and non-weighing lysimeter. The weighing lysimeters provide scientists the basic
information for research related to evapotranspiration, and they are commonly divided into two types, continuous weighing and intermittent weighing. Weighing lysimeters have been
used to quantify precipitation (P) not only in the form of rain or snow, but also dew, fog and rime, and also to determine actual evapotranspiration (ET). Compared to laboratory experiments, out-door lysimeter studies have advantages, like being closer to field environment conditions, it is possible to grow plants and therefore to study the fate of chemicals in soil/plant systems, transformations and leaching. The limitations are costy, which depend on design, variable experimental conditions, such as environmental/
climatic parameters, which are normally not controlled, the soil spatial variability is normally less, they are not suitable for every plant species and even every soil type. The objective of lysimeter is defining the crop coefficient (Kc), which used to convert ETr into equivalent crop evapotranpiration (ETc) values, and determing agronomical characteristics of crops, which are planted in the field of lysimeter. The duration of a lysimeter study is determined by the objective of the study, but for different crops, it should normally be at least two years. Weighing lysimeters using load cells have the advantage of measuring the water balance in the soil over a short time and with good accuracy. Precipitation should be recorded daily at the lysimeter site. All weather data like air temperature, solar
radiation, humidity and potential evporation should be obtained onsite, and the frequency and time of measurements should be at least daily
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Psychological impacts of returning home during the COVID-19 pandemic: a cross-sectional survey among Iranian students
Background: In addition to its potentially harmful physical consequences, coronavirus disease 2019 (COVID-19) can cause various negative psychological consequences for individuals. One cohort likely to have been affected is university students who have had to return and study from their home cities due to the physical closures of universities.
Objectives: The present study was conducted on students to assess psychological impacts (i.e., anxiety, depression, and stress) on predicting COVID-19 anxiety resulting from returning home and quarantining due to university closure.
Methods: The study sample comprised 715 Iranian students who were asked to complete the Depression, Anxiety, and Stress Scale-21 Items (DASS-21) and the Corona Disease Anxiety Scale.
Results: The mean scale scores for COVID-19 anxiety, stress, depression, and anxiety were 13.75 (out of 54), 6.68 (out of 21), 5.54 (out of 21), and 4.74 (out of 21), respectively. Significantly higher levels of COVID-19 anxiety were observed among students who had been infected with the virus or had family/friends infected with the virus (compared to individuals who had not). Moreover, students who lived with their friends reported significantly higher COVID-19 anxiety than those who lived with their families.
Conclusions: The study also showed a positive association between psychological distress and COVID-19 anxiety among students who returned to their homes during the pandemic. The findings suggest that mental health interventions are needed for students and should be implemented in the early stages of future pandemics
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Effects of emotional working memory training on problematic internet use, inhibition, attention, and working memory among young problematic internet users: a randomized control study
Problematic internet use (PIU) has been defined as an inability to control impulses to use the internet, and is associated with psychological, social, educational, and/or occupational problems. Considering the harmful effects of PIU, the present study evaluated a treatment intervention aimed at controlling PIU. A randomized control study investigated the effectiveness of emotional working memory training (eWMT) in improving inhibition, attention, and working memory among individuals with PIU in comparison with a placebo group. Young adults (N = 36) with PIU were either trained for 20 sessions in an n-back dual emotional task (eWMT; n = 18) or a feature matching task (placebo; n = 18). Results showed that 20 continuous sessions of eWMT significantly reduced the symptoms of PIU and improved participants’ working memory, attention, and inhibition (compared to the placebo group). These preliminary findings suggest that eWMT can be considered a promising treatment to reduce PIU by improving individuals’ cognitive and emotional functioning