List of Articles corn yield

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  1 - Interaction between Nicosulfuron dose and timing on Johnson grass and maize competition indices
  Fatemeh Eynollahi Mostafa Oveisi Hamid Rahimian Mashhadi
  Chemical weed control is a main component of management programs of crop productions. Timely herbicide application significantly increases herbicide efficiency. A field experiment was conducted to study the effect of Nicosulfuron timing and dose on S. halepense competit More

  Chemical weed control is a main component of management programs of crop productions. Timely herbicide application significantly increases herbicide efficiency. A field experiment was conducted to study the effect of Nicosulfuron timing and dose on S. halepense competition with maize. Experiment was split-plot in three replications. Main plots were herbicide dose of 0, 1, 1.5, 2, 2.5 kg/ha and sub plots were herbicide timings of 2-4 l, 4-6 l, 6-8 l of maize growth. Growth parameters of maize including height, leaf area (LA) and total biomass (TB) were measured. Results showed, the highest height, LA and TB were obtained from Nicosulfuron application at 1.5 Kg/ha in 2-4 l of maize and no significant difference was shown to herbicide recommended dose or higher. With delay in herbicide application, the height and TB of S. halepense increased and its competition with maize got raised. It caused decrease in maize growth indices. Current study showed main effect of herbicide dose in changing weed-crop interactions. Successful management would change competition in advantage to crops using lower herbicide doses to achieve both economic and environmental purposes in sustainable crop protection. Manuscript profile
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  2 - مروری بر تأثیر بیوچار در جذب و آبشوئی علف کش‌ها
  Omid Alasti Javid Gharakhlou
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  3 - Evaluating Yield Variations of Corn (single cross 260) at Different Water Regimes and Nitrogen Rates by Using of Growth Indices
  مهتا Haghjoo A. Bahrani
  To evaluate the effects of different irrigation and nitrogen levels on variations of growth indices and corn (Single cross 260) seed yield, an experiment was conducted in a semi-arid area in Fars Province, Iran, during 2011 and 2012 growing seasons. The experiment was s More

  To evaluate the effects of different irrigation and nitrogen levels on variations of growth indices and corn (Single cross 260) seed yield, an experiment was conducted in a semi-arid area in Fars Province, Iran, during 2011 and 2012 growing seasons. The experiment was split-plot, based on a complete randomized block design with four replications. The main plots consisted of four moisture levels: (20% FC), (40% FC), (60% FC) and (80%FC) and sub-plot of four rates of nitrogen fertilizer applications: 150, 200, 250 and 300 kg.ha-1. Results showed that with increasing nitrogen fertilizer levels, LAI, NAR, SLA and RGR were also increased, but under lower moisture regimes they were decreased. The lowest and highest growth indices belonged to 80% and 20% water depletion, respectively. The lowest CGR index was obtained at 80% water depletion and 150 and 300 kg nitrogen ha-1. LAR increased at the intial growth period and then decreased. Positive relationships between seed yield and growth indices were also observed. At FC 20% and 300 kg N ha-1 treatment highest grain yield was obtained and growth indices were also in the highest values. In general, nitrogen application increased all traits. However, there were not significant differences between 250 and 300 kg N ha-1on the traits under study. It seems that nitrogen fertilizer mitigates the negative effects of water deficiency. Application of 250 kg of nitrogen fertilizer had the highest effect on all levels of moisture content. Manuscript profile
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  4 - Evaluation of AquaCrop and WOFOST in simulating of corn yield under deficit irrigation
  Aslan Egdernezhad1 Ali Reza Masjedi 2 Ali Reza Shokouhfar 3 Mojtaba Alavifazel 4
  This study was conducted to evaluate two crop growth models (AquaCrop and WOFOST) in simulating corn yield under different irrigation water (T1:50, T2:75, T3:100 and T4: 150 mm evaporation from pan A) using data collected from a research farm station in Ahwaz during one More

  This study was conducted to evaluate two crop growth models (AquaCrop and WOFOST) in simulating corn yield under different irrigation water (T1:50, T2:75, T3:100 and T4: 150 mm evaporation from pan A) using data collected from a research farm station in Ahwaz during one season crop. Results showed that the highest and the lowest different between collected and simulated yield values using AquaCrop were obtained in T3 (0.45 ton.ha-1) and T2 (0.10 ton.ha-1), respectively. Using WOFOST were obtained in T4 (0.15 ton.ha-1) and T1 (0.01 ton.ha-1), respectively. The lowest and the highest different for biomass values using AquaCrop were obtained in T4 (1.1 ton.ha-1) and T3 (2.03 ton.ha-1), respectively. Results for WOFOST were obtained in T2 (0.65 ton.ha-1) and T1 (1.95 ton.ha-1), respectively. RSME values for corn yield using AquaCrop and WOFOST were 0.16 and 0.15 ton.ha-1, respectively. RMSE values for corn biomass using AquaCrop and WOFOST were 0.92 and 0.88 ton.ha-1, respectively. Values for MBE using AquaCrop and WOFOST were 0.04 and -0.05 ton.ha-1 for corn yield, respectively, and -0.52 and -0.47 ton.ha-1 for corn biomass, respectively. In general, WOFOST had a better accuracy to simulate corn yield. Manuscript profile
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  5 - Project Title: Study of possibility of changing corn planting pattern (by using narrower rows and eliminating some planting furrows) to increase the yield and to decrease water use in Jiroft and Kahnooj
  GH. Afsharmanesh P. Rahbarian S. A. Farshadmehr
  In order to study the possibility of changing corn planting pattern by using narrower rows and eliminating some furrows, an experiment was conducted in the fields of Agriculture Training Center of Shahid Dehghanpur of Jiroft, Iran in 2001 on the basis of a Randomized Co More

  In order to study the possibility of changing corn planting pattern by using narrower rows and eliminating some furrows, an experiment was conducted in the fields of Agriculture Training Center of Shahid Dehghanpur of Jiroft, Iran in 2001 on the basis of a Randomized Complete Block Design with three replications. The studied was composed of 18 treatments including inter-row spacing of 35 cm with the densities of 75000, 85000 and 95000 plants.ha-1 (T1, T2 and T3, respectively), inter-row spacing of 35 cm with the elimination of four unplanted furrows with the densities of 75000, 85000 and 95000 plants.ha-1 (T4, T5 and T6, respectively), inter-row spacing of 75 cm with the densities of 75000, 85000 and 95000 plants.ha-1 (T7, T8 and T9, respectively), inter-row spacing of 75 cm with the elimination of one planting row with the density of 75000, the elimination of two unplanted rows with the density of 85000 and the elimination of two unplanted rows with the density of 95000 plants.ha-1 (T10, T11 and T12, respectively), inter-row spacing of 55 cm with the densities of 75000, 85000 and 95000 plants.ha-1 (T13, T14 and T15, respectively) and inter-row spacing of 55 cm with three unplanted rows and the densities of 75000, 85000 and 95000 plants.ha-1 (T16, T17 and T18, respectively). Measured traits included grain yield, row number per ear, grain number per row, 1000-grain weight, grain ratio to total, plant height, biomass, mean ear weight and harvest index.  Results showed that the effect of treatments was significant on grain yield, 1000-grain weight, plant height and biomass at 5% statistical level and on grain number per row, ear length and mean ear weight at 1% probability level. But, their effect was not significant on other traits. The highest grain yields were obtained from treatments T1, T12, T5, T7, T4 and T14 which resulted in the production of 17.51, 16.81, 15.99, 15.66, 15.26 and 15.25 t grains per hectare, respectively. Finally, treatments T12, T4 and T5 can be recommended for studied region given the results of all measurements and the decrease in applied water level (lower area of land was irrigated). Manuscript profile