M Katozi, F Rahimzadeh Khouee, H Sabori,
Volume 13, Issue 47 (4-2009)
Abstract
In order to study the relationship between grain filling rate, duration and leaf relative water content (RWC) and yield, an experiment was conducted at Rice Research Institute of Iran, as a randomized block design in Split Plot with 3 replications, in 2006. 5 irrigation levels as main factor (Continuously flooded, days after water banishment, 5, 8 and 11 day intervals immediately after 10 days of transplanting) and sub main factor were used with 3 rice cultivars, Bahar (hybrid), Dorfak (improved) and Ali kazemi (traditional).Bahar cultivar showed the highest (6710 km/h) yield in continuous conditions. And no significant difference was observed between continuous irrigation conditions and 5 day interval irrigation. In continuous irrigation condition (except 1 day after flowering), Dorfak cultivar in all sampling had the highest grain weight in grain filling duration, but in days after water banishment Bahar had the highest grain weight(2/41). Grain filling rate in Dorfak in all treatments was higher than Bahar, and in Ali kazemi in all treatment s it was higher than the other cultivars. In all sampling dates (8, 11, 14, 17, 20, 23, 26, 29 and 30day after heading), leaf relative water content of Ali kazemi was significantly less than Bahar and Dorfak. Dorfak produced the highest leaf relative water content. Results of the grain filling rate showed that Bahar with the longest grain filling duration and highest yield (6710 km/h) is more adaptable than Dorfak and Ali kazemi for different irrigation management conditions.
H. Sharifan, S. Jamali, F. Sajadi,
Volume 22, Issue 2 (9-2018)
Abstract
In order to study the effects of different irrigation regimes and different levels of salinity on the growth parameters of Quinoa (Chenopodium quinoa Willd.), this experiment was performed in the research green house of Water Engineering Department, at f Gorgan University of Agricultural Sciences and Natural Resources, during 2016. The experimental design was a factorial with n a randomized complete design in three replications. Treatments included three irrigation levels (100, 75 and 50 percent of water requirements calculated by the evaporation pan class A) and five salinity levels (0.5, 4.3, 8, 11.8, 16 dSm-1). The results showed that the effect of irrigation on the Leaf area index, chlorophylls and RWC (P<0.01) and Leaf length, and width (P<0.05) was significant. The effect of salinity levels on the Leaf area index, chlorophylls, Leaf length and width, RWC, Specific leaf weight (P<0.01) and Leaf petiole length (P<0.05) was significant too. The interaction between irrigation and salinity levels on chlorophylls and RWC (P<0.01) and Leaf width (P<0.05) was significant as well. According to the results, Quinoa had a good tolerance to the elevated levels of deficit irrigation. Decreasing the irrigation levels from 100 to 50 percent of pan evaporation resulted in the reduction of the Leaf area index and RWC to 24.6 and 7.3 percent, respectively. The result also showed that Quinoa had a good tolerance to the elevated levels of salinity, the mixing sea water, and tap water at rate of 30 percent, with control treatment having no significance for all of the parameters. It seems that good stand establishment in the saline soils and water conditions could be insured if proper management is applied in the farms.
