Farhad Azizi; Ali Mahrokh; Vida Ghotbi; Farid Golzardi; Seyed Mohammad Ali Mofidian; Mohammad Zamanian; Vahid Rahjoo; Masoud Torabi; Elias Soltani
Abstract
To identify the limiting factors in forage maize production in Iran, this study has been carried out in order to separate the effective and influential management factors in forage maize production in the country with data. It is obtained from 43 final reports or their derived extracted articles in Agricultural ...
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To identify the limiting factors in forage maize production in Iran, this study has been carried out in order to separate the effective and influential management factors in forage maize production in the country with data. It is obtained from 43 final reports or their derived extracted articles in Agricultural Research, Education and Extension Organization (AREEO) with meta-analysis method. According to the results, plant density (5.65%), drought stress (-13.44%), cultivar (0.31%), planting date (2.54%), and nitrogen fertilizer (24%) justify the amount of forage maize variation. Based on the results of this study, forage yield has increased by about 9.49%, increasing plant density between 80 to 100 thousand plants per hectare. Maize forage yield has decreased significantly under mild stress, severe stress, and very severe drought stress by 25.30%, 14.38% and 8.99%, respectively. Also, for different cultivars and different groups of maturity, group-700 has had a significant increase of 3.83% compared to other groups. For the planting dates of forage maize compared to the control, which is the first half of June, a decrease in forage yield is observed. Finally, the highest percentage of increase in maize forage yield has been obtained from the use of 450 kg ha-1 of urea fertilizer. Overall, nitrogen fertilizer, drought stress, and planting density are recognized as the most important factors affecting corn forage yield in Iran, respectively.
mohsen zafaranieh
Abstract
In order to evaluate the effects of planting date and plant density on phenology, seed yield, and essential oil quality of Guar, an experiment has been conducted during 2018-2019 and 2019-2020 growing seasons. It is a split plot layout based on a randomized complete block design with three replications. ...
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In order to evaluate the effects of planting date and plant density on phenology, seed yield, and essential oil quality of Guar, an experiment has been conducted during 2018-2019 and 2019-2020 growing seasons. It is a split plot layout based on a randomized complete block design with three replications. Different planting dates are considered as the main factor, including September 5th to February 5th as monthly. Three plant densities are considered as sub-factor (20, 40, and 60 plants in a square meter). The required growing degree- day (GDD) from sowing to physiological maturity ranges between 1802.3 and 2347.9 °d on different planting dates. The highest GDD from sowing to physiological maturity is observed on May 5th. The highest seed yield (3780 kg / ha) and galactomannan yield (1050 kg / ha), 100- seed weight (3.5 g), and oil percentage (17.9%) belong to May 5th + 40 plants per m2. by delaying planting time, 100- seed weight causes oil percentage to drop and the seed yield (40%), galactomannan (68%) and the oil percentage (15%) are observed in September. Therefore, it seems that the best time and density for planting Alyssum is May 5th with a density of 40 plants per m2.
Ali Mahrokh; Farid Golzardi; Farhad Azizi; seid mohammad ali mofidian; Mohammad Zamanian; Vahid Rahjoo; Masoud Torabi; Elias soltani
Abstract
To identify the limiting factors in grain maize production in Iran, a study has been carried out to particulate effective and influential management factors of this crop’s production in the country. The data come from 95 final reports or extracted articles in Agricultural Research, Education, and ...
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To identify the limiting factors in grain maize production in Iran, a study has been carried out to particulate effective and influential management factors of this crop’s production in the country. The data come from 95 final reports or extracted articles in Agricultural Research, Education, and Extension Organization (AREEO), undergoing meta-analysis. Based on this study, of all grain maize variation, 2.93% is justified by plant density, 6.81% by planting structure, 11.12% by planting rotation, 2.28% by conservation agriculture, 25.28% by drought stress, 4.99% by cultivar, 4.46% by planting date, and 25.84% by nitrogen fertilizer. Accordingly, 100 thousand plants per hectare, zigzag double rows planting structure, maize-leguminous crops planting pattern, cultivating in residue, optimum irrigation without drought stress (in case of water availability), 700 maturity group cultivar (in case of adequate growing season), planting in May and early August in temperate and tropical climate, and using maximum 100-300 kg urea fertilizer per hectare are recommended to decrease yield gap in grain maize production.
Nabi Hadavand; Ahmad Ershadi; Rohollah Karimi; Alireza Talaei; Mohammad Ali Askari Sarcheshmeh
Abstract
High-density planting system is one of the effective methods for improving production and profitability of tree orchards. In this research, the effects of four planting densities (1904, 2666, 3137 and 4800 tree/ha) on annual shoot growth, Physicochemical properties of fruit and leaf mineral contents ...
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High-density planting system is one of the effective methods for improving production and profitability of tree orchards. In this research, the effects of four planting densities (1904, 2666, 3137 and 4800 tree/ha) on annual shoot growth, Physicochemical properties of fruit and leaf mineral contents of apple (Malus domestica Borkh cv ‘Granny Smith’) tree grafted on M26 clonal rootstock were studied in randomized complete block design with four treatments and four replications in College of Agriculture and Natural Resources, University of Tehran, during 2009-2010. Based on results, planting density significantly affected some qualitative characteristics such as fruit length, fruit diameter, total soluble solid, fruit dry matter, fruit ash and sun scald, but no significant effect on fruit weight, fruit L/D ratio, TA and tenacity were observed. Planting density significantly affected the leaf N and Fe concentrations. The highest N (1.81 percent) and Cu (39 µg/kg) the lowest Fe of leaves (237 µg/kg) was observed with 1904 tree/ha. Although, planting density had no significant effect on other mineral elements, but with increasing the planting density, leaf P, K, Mg and Mn content increased, but, Ca and Cu decreased. Increasing in N and Fe was associated with a decrease and increase of current seasonal shoot growth, respectively. Likewise, trees with higher crop tend to have more N and less Fe. These results showed that, under Iran climatic condition, with increasing in planting density of apple orchardit can be produced higher fruit crop without decrease in its quality parameters.