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Showing 2 results for Urea Fertilizer
Hossein Mokhtari Karchegani, Seyedh Zahra Hosseini Cc, Seyed Abdolreza Kazemeini ,
Volume 1, Issue 2 (3-2015)
To evaluate the effects of nitrogen and water stress on allelopathic potential of sorghum (Sorghum bicolor) on the seed germination traits of safflower (Carthamus tinctorius), a factorial experiment was carried out in randomized complete design (CRD) with three replications in the greenhouse and laboratory, College of Agriculture, Shiraz University, Shiraz, Iran in 2012-13. Treatments included irrigation [Normal (I1) and water stress (I2)] and nitrogen [control (no nitrogen), Urea (200 kg N ha-1), Nitroxin (Azotobacter) and Nitrokara (Azospirillum and Azotobacter) inoculation per kg seeds]. Extracts were prepared from sorghum shoot resiude in 5, 10, 15 and 20 (W/V) and were applied to individual Petri dishes distilled water was used as control treatment. Also, foliar applications of extracts were applied in treatments under the greenhouse conditions and sorghum dried residues were also mixed with the soil in amounts of 0, 5, 10, 15, and 20 g after the first irrigation. Analysis of variance showed that interaction effects of sorghum extract type and its concentration had significant effects on all traits except relative water content. Safflower germination percentage reduced with increase in concentration. 5, 10 and 15% concentrations of Nitrokara under normal irrigation had 34, 22 and 12%, effects on allelopathy index of safflower respectively. Whereas concentration of 20% extract, decreased allelopathy index by 71%. The effects antagonist on length and dry weights of roots and shoots was observed when biofertilizer treatments (Nitroxin and Nitrokara) applied. In addition, more synergist effects were obtained when urea extract was appliedt under water stress. The results of foliar application revealed a decrease in CAT and POD activities in leaves of safflower when urea was usedunder water stress conditions. However, the lowest germination rate and primary growth of safflower was abserved when urea applied under water stress conditions.
Valiollah Rameeh, Mohammad Bagher Salimi,
Volume 2, Issue 1 (9-2015)
In order to evaluate the effect of different nitrogen fertilizer levels on physiological traits, plant height, yield components, and seed yield of rapeseed genotypes a split-plot experiment based on a randomized complete block design with three replications was carried out at the Baykola Agriculture Research Station, Mazaandaran during 2010-11. Four levels of nitrogen, as urea fertilizer, including of 0, 70, 140 and 210 kg ha-1 were considered as main plots and four rapeseed genotypes including of L7, Zafar, RGS003 and Hyola401 were considered as subplots. The result of analysis of variance revealed that the traits, including number of days to flowering, number of days to end of flowering, number of days to maturity, plant height, siliques pods per plant, seeds per silique, seed yield and oil yield were significantly affected by nitrogen levels. Genotype effect was significant effect on all the traits except seeds per silique. Hyloa401 and Zafar respectively with 3831.2 and 3893.7 kg ha-1 of seed yield, and also 1638 and 1591 kg ha-1 of oil yield were classified at the same statistical group. Non significant interaction effects of nitrogen fertilizer application and genotypes were achieved for all of the studied traits, indicated that the trend of variation of these traits due to nitrogen levels were similar in all genotypes. A significant positive correlation of seed yield with the other studied the traits, except days to flowering, indicated that increasing of nitrogen level application made increasing of the traits and finally seed yield.