جستجوی مقالات مرتبط با کلیدواژه « flooded » در نشریات گروه « آب و خاک »

In this research، the effects of variety، water regimes، nitrogen and phosphorus on the concentration، content، and translocation factor of iron، zinc، and manganese in rice was studied in greenhouse conditions in a calcareous soil. This factorial experiment was done in a randomized complete blocks design with three replicates. The factors included two varieties of rice (Hashemi and Ali Kazemi)، water regimes at two levels (continuous submergence and intermittent saturation)، N at three levels (0، 75، 150 mg kg-1) as urea، and P at three levels (0، 25، 50 mg kg-1) as mono calcium phosphate. Having completed 90 days، plants were harvested and total content and concentrations of Fe، Mn and Zn in shoot and root were measured. According to the results، N application caused an increase in Fe concentration of shoot (the above-ground parts)، but caused a decrease in Zn and Mn concentration. However، N application caused an increase in Fe، Zn، and Mn content of shoot. P application caused a decrease in Fe and Zn concentration of shoot، but caused no significant change in Mn concentration of shoot. Also، P application caused a decrease in Fe، Zn، and Mn content of shoot. The result showed that Zn concentration in root and Fe concentration in shoot of Hashemi variety was greater than in Ali Kazemi variety. Fe، Mn، and Zn concentrations in shoot and root in flooded conditions were greater than in periodic saturation. In this research conditions، the content of Fe in shoot and root of both cultivars were not significantly different، but the content of Fe in the shoot and roots of the continuous flooded conditions were greater than the intermittent saturation. In the case of Zn content in shoot and root، there were no significant difference between the two varieties، but the Zn content of shoot was greater under the continuous submergence than in intermittent saturation. Interactions between nitrogen and phosphorus had significant effect on Zn، Fe، and Mn concentrations of shoot and root. Translocation factor of Zn in Hashemi variety was greater than Ali Kazemi variety، but، in the case of Fe and Mn، difference in the translocation factor between the two varieties was not significant. In this experimental condition، translocation factor of Mn was greater than that of Zn and Fe.

Rice (Oryza sativa L.) is one of the strategic crops in Iran and water shortage is the most important abiotic stresses limiting its yield. In this research the effect of variety، water regime، nitrogen (N) and phosphorus (P) levels on N، P and K uptake was studied under greenhouse conditions. The experiment design was factorial based on randomized complete blocks with three replications. The factors included two varieties of rice (Hashemi and Ali Kazemi)، two water regimes (flooded and periodic saturation)، three nitrogen levels as urea (0، 75، 150 mg kg-1) and three P levels as mono calcium phosphate (0، 25، 50 mg kg-1). After 90 day growth period، plants were harvested and total content and concentration of N، P and K in shoot and root were determined. The results showed that K concentrations in shoot and root، K content in shoot and N translocation factor in Ali Kazemi were greater than Hashemi variety. But P concentration in root، P translocation factor and P content of the root in Hashemi became higher in Ali Kazemi variety. P concentration of shoot and root، K concentration of shoot، N content of shoot، P and K contents of the shoot and root under flooded conditions were significantly (P<0. 01) higher under periodic saturation conditions. Interaction between N and P produced significant effect on N and K concentrations of shoot and root، P concentration of root، N and P translocation factors، N، P and K contents of the shoot and root.