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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Bannayan (검색결과 4 건)
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Rezaei, Ehsan Eyshi,Kafi, Mohammad,Bannayan, Mohammad 한국작물학회 2013 Journal of crop science and biotechnology Vol.16 No.3
Persian shallot (Allium altissimum Regel.) was grown under fully irrigated conditions in a 2-year-field experiment (2010 - 2012) in the northeast of Iran to study and determine (i) radiation and nitrogen-use efficiency, (ii) growth analysis, (iii) carbon partitioning, and (iv) biomass production under different rates of nitrogen and cultivated bulb weights. The field experiment was performed as a randomized complete block design with a factorial arrangement of four nitrogen levels (control (100), 200, 250, and 300 kg $ha^{-1}$) and two levels of cultivated bulb weight (10 - 20 and 20 - 30 g) with three replications in both years of the experiment. Our results showed that increasing the nitrogen rate and bulb weight significantly enhanced Persian shallot production. Radiation-use efficiency (1.06 to 1.27 g $MJ^{-1}$), maximum crop growth rate (8.3 to 11.2 g $m^{-2}\;d^{-1}$), and maximum leaf area index (1.3 to 2.6) showed a positive correlation with nitrogen rate and bulb weight. Nevertheless, nitrogen-use efficiency (0.87 to 2.38 g bulb per g nitrogen) indicated a negative relationship with applied nitrogen rate. Moreover, increasing the nitrogen application rate increased the carbon allocation to above-ground organs. On the other hand, nitrogen limited conditions increased the carbon allocation to underground organs and carbon remobilization from stem and leaves to bulbs during the late growth season. Increasing the nitrogen application rate and bulb weight may be appropriate practices for enhancing Persian shallot production; however, evaluation of the impact of nitrogen on the quality of bulbs needs to be investigated.
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Ehsan Eyshi Rezaei,Mohammad Kafi,Mohammad Bannayan 한국작물학회 2013 Journal of crop science and biotechnology Vol.16 No.3
Persian shallot (Allium altissimum Regel.) was grown under fully irrigated conditions in a 2-year-field experiment (2010 - 2012)in the northeast of Iran to study and determine (i) radiation and nitrogen-use efficiency, (ii) growth analysis, (iii) carbon partitioning,and (iv) biomass production under different rates of nitrogen and cultivated bulb weights. The field experiment was performed as a randomized complete block design with a factorial arrangement of four nitrogen levels (control (100), 200, 250, and 300 kg ha-1) and two levels of cultivated bulb weight (10 - 20 and 20 - 30 g) with three replications in both years of the experiment. Our results showed that increasing the nitrogen rate and bulb weight significantly enhanced Persian shallot production. Radiation-use efficiency (1.06 to 1.27 g MJ-1), maximum crop growth rate (8.3 to 11.2 g m-2 d-1), and maximum leaf area index (1.3 to 2.6) showed a positive correlation with nitrogen rate and bulb weight. Nevertheless, nitrogen-use efficiency (0.87 to 2.38 g bulb per g nitrogen) indicated a negative relationship with applied nitrogen rate. Moreover, increasing the nitrogen application rate increased the carbon allocation to above-ground organs. On the other hand, nitrogen limited conditions increased the carbon allocation to underground organs and carbon remobilization from stem and leaves to bulbs during the late growth season. Increasing the nitrogen application rate and bulb weight may be appropriate practices for enhancing Persian shallot production; however, evaluation of the impact of nitrogen on the quality of bulbs needs to be investigated.
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Growth Analysis of Rhizomania Infected and Healthy Sugar Beet
Javad Rezaei,Ahmad Nezami,Mohsen Mehrvar,Bagher Mahmoodi,Mohammad Bannayan 한국작물학회 2014 Journal of crop science and biotechnology Vol.17 No.2
Viral disease of rhizomania is one of the most important diseases of sugar beet all over the world. The disease significantly hasreduced the yield and quality of sugar beet, and has imposed high economic loss to farmers. Long-term breeding programs to introducetolerant cultivars are the only chance of avoiding further yield losses. This study tried to measure and analyze the growth of shoots androots of rhizomania-tolerant and -susceptible sugar beet with the aim of providing information for modeling of the rhizomania effectson the growth of sugar beet. Growth indices were used for analyzing, quantification, and time-course of sugar beet growth underinfested and non-infested soils conditions. A 2-year experiment was conducted using four sugar beet cultivars in 2010 and 2011 inMashhad, Iran. The results of this study showed that under infested soils, root dry matter and leaf area index of the susceptible cultivarsin comparison to tolerant cultivars were lower by 57 and 24%, respectively. In addition, crop growth rate and net assimilation rateof susceptible cultivars were affected by rhizomania and were lower than in tolerant cultivars. On non-infested soil, the differencebetween dry matter and growth indices of susceptible and tolerant sugar beet cultivars was not significant. Rhizomania decreasedgreen area and photosynthesis capacity and led to lower growth rate and dry matter production. Our study quantified the growth of rhizomania-infested sugar beet plants in comparison with non-infested plants and provided information to be used for modeling of therhizomania effects on the growth of sugar beet
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