جستجوی مقالات مرتبط با کلیدواژه « Planting date » در نشریات گروه « اکولوژی »

In this research the effect of planting date and Bentazon application on control of weeds, and soybean yield was investigated.

Methods and Materials:

 Experiment conducted as split plot in a randomized complete block design with 4 replicates. Mainfactor included five planting dates (20 April, 4 May, 18 May, 2 June and 16 June) and subfactor was herbicide application including without and with bentazone application.

Delay in planting date and herbicide application, wild melon, and black nightshade control increased both at 10 and 30 days after spraying. The late planting date reduced soybean economic (29.2%) and biological yield (41.1%). Delay in planting date reduced the biomass of wild melon (99%) and black nightshade (61%) and other weeds (82%). Herbicide application decreased the biomass of wild melon (51%) and black nightshade (92%) and other weeds (71%). Soybean yield in early planting date was higher (71%) than late planting date. In the late planting date, density of wild melon and black nightshade was lower than early planting date. Delay in planting date accelerated flowering, and reduced ripening period, seed production, and yield.

The early planting date of soybean along with the application of bentazone reduces weed growth, crop damage and increases soybean yield that can be recommended to farmers.

The aim of this study was to investigate the effects of planting date(13 May,10 June And 8 July) and corn cultivars(KSC400,KSC647 And KSC 704) on the yield and yield components in Karaj. An experiment was conducted as a split-plot design based on randomized complete blocks with four replications in the research farm of the University of Tehran. The results showed that the highest yield belonged to the second planting date (11.98 t.ha-1), the third planting date (11.56 t.ha-1), the first planting date (11.18 t.ha-1), respectively. The results revealed that in the first and third planting dates, corn grain yield was decreased due to the occurrence of the high daily temperatures in the reproductive stage. Furthermore, a coincidence of the decreasing temperatures with the grain filling period in autumn led to corn grain yield reduction. Due to the appropriateness of the reproductive stages in the second planting date, the length of seed abortion was decreased and the length and size of the ear, the weight of the ear, the number of seeds per ear, and grain yield were increased. The results revealed that the 400 cultivar (10.25 t.ha-1) in July, 647 (12.35 t.ha-1) in May and 704 (13.77 t.ha-1) in June had the highest yields in the study area. In addition, to reduce the frequency of irrigation and save water, it is recommended to cultivate medium and early maturing varieties of corn on 13 May and 8 July sowing dates, respectively.

To increase the quantitative yield of canola (Brassica napus L.),due to the interaction of zinc application in winter planting dates on spring canola cultivars.

The experiment was performed as a factorial split-plot in a randomized complete block design with three replications was conducted during two experimental years (2016-2017) in Alborz province (Karaj).Experimental factors including winter planting date in three levels (11.20, 11.30 and 12.10) and zinc factor in two levels (no application of zinc and application of zinc in stem elongation stage were considered as factorial in the main plots and factor cultivars were classified into four levels (Sarigol, Dalgan, Salsa and Solar) in the subplot.

The results showed that planting date has a great impact on yield, yield components and oil of canola cultivars.Delayed culture reduced leaf chlorophyll concentration.Also the yield components of canola were reduced due to delay in planting and non-application of zinc,which eventually reduced the yield of canola seed and oil.The tested genotypes had the highest yield on the date of normal cultivation.The highest oil yield was observed in the Dalgan cultivar (2066 kg/ha) due to zinc application on normal cultivation.Delay in planting caused an increase in glucosinolate.

In general, foliar application of zinc,reduced the negative effects of delay in planting in most of the studied traits of different rapeseed cultivars.Due to the effect of zinc application and adaptation of Dalgan cultivar to a certain range of planting date for canola production in this area and areas with similar climates is recommended

The aim of this study was to evaluate the effect of planting date and plant density on eco-physiological, agronomic, morphological traits and yield components of two fava bean genotypes in Dezfoul region.

The experiment was conducted in Safiabad-Dezful Research Center as a factorial split plot based on randomized complete block design with three replications during the two crop years of 2017 and 2018. In this study, the effect of two Fava bean genotypes (Saraziri and line 62), on three planting dates (11 October, 31 October and 20 November) and at three densities (10, 15 and 20 plants per square meter) on grain yield, Harvest Index, stem diameter, plant height, seed protein percentage, leaf chlorophyll content, photosynthesis rate and leaf stomatal conductance were evaluated. 

The results showed that the highest grain yield and harvest index were related to the Saraziri genotype Planted on October 11th with the density of 15 plants per square meter. Regarding the measured morphological and physiological traits, the highest plant height and chlorophyll content belonged to the Saraziri genotype cultivated on October 31th with the density of 20 plants per square meter and the highest percentage of protein, photosynthesis rate and stomatal conductivity was related to the Saraziri genotype cultivated on November 20th with the density of 20 plants per square meter. The highest stem diameter was related to the Saraziri genotype planted on the 20th of October with a density of 10 plants per square meter.

The results of this study showed that while reducing the growth period leads to a decrease in Seed yield along with increasing crop quality, to achieve the desired morphological characteristics and obtain good Seed yield in the Faba bean plant in Dezful region, Khuzestan province it is better to prolong growth period by planting on October 11th and the density of 15 plant per square meter is recommended.

This study was conducted to evaluate some qualitative traits (fatty acids, canopy temperature and stomatal resistance) of new rapeseed genotypes in response to irrigation cut-off and zinc application in Karaj. 

This experiment was performed as a factorial split-plot in a randomized complete block design with three replications for two cropping years (2014-2015 and 2015-2016) in Karaj. In this study, irrigation at three levels including normal or controlled irrigation, cessation of irrigation from flowering stage onwards and cessation of irrigation from pod stage onwards, zinc in two levels including normal water (no zinc application), and foliar application with zinc 30 g.L-1 zinc and rapeseed cultivars including Danob, HW113, KR2, L155, HL2012 were placed in sub-plots. 

The results of analysis of variance showed that the interaction effect of irrigation × genotype on 1000-seed weight, seed yield, seed oil percentage, stomata resistance, linoleic acid, linoleic acid, erotic acid was significant at the level of one percent. Also, the interaction effect of irrigation × on × genotype on grain yield, oleic acid, and linoleic acid at 1% level and canopy temperature, palmitic acid, and linoleic acid at 5% level were significant. Zinc reduced the adverse effects of dehydration stress on the tested genotypes so that under normal zinc application and irrigation conditions, L155 genotype with 6310 kg/ha grain yield and the highest percentage of oleic acid (67.3%). Besides, in terms of zinc application and irrigation interruption from the plowing stage onwards, HL2012 and L155 genotypes with grain yield of 5032 and 4826 kg.ha-1, respectively, and the highest percentage of oleic acid (65.8% and 65.7%, respectively) produced. Also, in case of cessation of irrigation from flowering stage onwards, HL2012 and L155 genotypes with 3679 and 3606 kg.ha-1 grain yield, respectively, had the highest percentage of oleic acid (64.3% and 64.2%, respectively). 

In general, the positive effect of zinc application on traits such as seed oil percentage (0.9 %) increased with increasing drought stress intensity and L155 genotype for all water conditions and HL2012 genotype for end-of-season drought stress conditions are recommended for planting in cold temperate regions with a semi-arid climate.

The aim of this study was to quantify the effect of managerial factors such as summer planting date on Heat Summation Unit (HSU), phenology and faba bean yield based on number of days and Aggregation Growth Degree Day (AGDD) and to introduce the most suitable genotypes adapted to Mediterranean climatic conditions in the Caspian sea was conducted.   Materials &

In order to investigate effect off-season planting date (Summer) on phenology and yield of faba bean var. Luzde otono using accumulation of thermal units conducted at the Gharakhil Agricultural Research Station in 2014 and 2015. Treatment included four summer sowing dates (July 23, August 7, August 23, September 7) by experiment based on randomized complete block design with three replications.  

The results showed that cultivar Luzde otono in the second planting date (August 7) with 9100 kg which has increased by 124% compared to the last planting date (September 7) had the highest yield (green pod). The unit of heliothermal was more in 2015 (from 0.800 to 1.320) compared to 2016 (from 0.576 to 0.983). On August 7, the efficiency of heliothermal consumption (1.320) increased compared to the first date of August 1 (1.200), which was due to the increase in average air temperature and the number of hours of sunshine. Also, among the studied indicators, the efficiency of heat consumption (HUE) and the efficiency of consumption of sunny hours (RUE) as well as estimated thermal requirement of faba bean Luzde otono cultivar in different cultivation dates and at different stages of development and in this direction, due to having a constant and logical trend, they have a relative superiority over other indicators such as GDD and PTI.  

According to the findings of this study, in order to prevent the coincidence of flowering period and seed filling with heat stress, The summer cultivation of faba bean Luzde otono cultivar has been avoided in June and July and recommended in order to obtain the highest yield (green pod) that cultivation be done in late August.

The present research was done in order to determine the optimum planting date, seed amount and to evaluate the grain and oil yields of spring rapeseed in saline and marginal areas around Urmia lake.

The RGS003 genotype was used for cultivation. The experiment was conducted as split plot based on a RCBD design in three replications with two factors including sowing date (30 March and 9 and 19 April) and seed amount (4, 6, 8 and 10 Kg seeds per hectare). The study was carried out in East Azarbaijan Agriculture and Natural Resources Research and Education Center (Khosrow Shah Station) during 2018 and 2019 cropping seasons.

The results indicated that the green field cover percent, Leaf chlorophyll index, plant height, pods per plant, 1000 seeds weight, grain oil percent and grain and oil yields were decreased significantly by delaying planting date from March 30 to April 19. Also this delay led to a significant decrease in grain and oil yields at all seed amounts. The highest amounts of grain and oil yields achieved from March 30 planting time and 6 Kg seeds per hectare. Correlations among the green field cover percent, Leaf chlorophyll in mid flowering stage with grain and oil yields were significantly positive. These indices had an important role in yield determining.

It is concluded that 30 March planting date and 6 Kg.ha-1 seeds amount can be suggested for spring rapeseed cultivation in saline and marginal areas around Urmia Lake and lands with similar climate.

The present study aimed to the effect of late and normal sowing date on agronomic characteristics of some spring and fall rapeseed cultivars was evaluated during two years.

A field experiment in a split plot based on a randomized complete block design was carried out with four replications at the research station of Islam abad-gharb. Main factor was planting date in two levels including September 27 and October 17 and sub factor was rapeseed cultivars including Okapi, Talaye, hyola 401, Zafar, RGS003 and sarigol.

The results of variance analysis showed that the effect of late planting was significant only on days to flowering and plant height. Grain yield decreased by 34.4% and 29.85%, due to the delay in planting date in the first and second year of the experiment, respectively. This decrease was due to the effect of late planting date on yield components, so that decrease in the number of pods per plant as the most important component of grain yield in rapeseed in the first and second years of the experiment was 32.7 and 30.2%, respectively. The results showed that the cultivars had significant differences for number of days to flowering, flowering duration, number of days to physiological maturity, plant height, number of pods per plant, grain yield and seed oil percentage. The mean of the data showed that Okapi and Talayeh as fall type cultivars had the highest grain yield with 5096 and 4906 kg ha-1 respectively.

Okapi and Talaie are suitable cultivars for the study area. Also, any delay in planting causes yields reduced compared to normal conditions. However, considering other existing issues can be ignored reduction in performance.

In order to investigate the response of grain yield, plant height and phenological traits of maize hybrids (Zea mays L.) to planting date, a factorial experiment was carried out based on complete randomized block design with four replications during two growing seasons (2013-2014) at Moghan Research Station. Treatments consisted of two planting dates (May 1 and June 25) and five maize hybrids (namely SC704 and SC720 from a late maturing group, TWC600 and SC647 from mid maturing group and SC301 from early maturing group). The results of statistical analysis showed a significant difference between years, planting dates and hybrids. The highest grain yield and plant height were related to SC704 and SC720. The results showed that the planting date on May 1 increased plant production compared to June 25. The highest average of days to physiological maturity related to planting date was May 1. SC704 and SC301 had the highest and lowest average of days to flowering and days to pollination in two different planting dates during two growing seasons (2013-2014) in Moghan region, respectively. Multiple regression analysis by stepwise method showed that in regards to days to pollination and days to physiological maturity with grain yield of maize hybrids there was a significant positive association (P<0.01) in two different planting dates (May 1 and June 25) during two growing seasons (2013-2014) in Moghan region. In conclusion, The phenological traits with grain yield can be used to select the best maize hybrids for different planting dates.

In this study، the effect of planting date and cropping systems were examined on the quantity and quality of ingredient materials and intercropping efficiency at isabgol- ajwain intercropping. The experiment was performed on split plot with two planting date; January 10 and February 9 comprising the main treatments، and six combinations of isabgol and ajwain (sole isabgol، sole ajwain، 25% isabgol + 100% ajwain، 50% isabgol + 100% ajwain، 75% isabgol + 100% isabgol and 100% isabgol + 100% isabgol) as sub-treatments that were applied with three replications. The experiment was conducted at the Zabol University research farm in Zabol، south Iran during 2013. Chemical analysis was performed using combination of capillary GC، GC-MS after fractionation on column chromatography and detected 33 compounds. p-Cymene and Gamma terpinene was the major oils compounds. The percentage، yield and chemical composition of oil differed between planting date. Delay in planting increased thymol and percentage of oil، while the greatest yield of oil and p-CymeneandGamma terpinene was achieved in January 10. The maximum percentage and yield of essential oil was obtained at sole ajwain، and increasing of plant population decreasedthymol and p-Cymenewhile increased Gamma terpinene. Sole isabgol had the greatest yield of mucilage and decreasing of population has significant impact on this parameter. Treatment of 50% isabgol + 100% ajwain had the greatest Land Equivalent Ration (LER=2. 53)، indicated yield advantage in intercropping over monocropping.