The Study of Dry Matter Remobilization in Rice Cultivars due to Planting Density Variations

Lack, Shahram; Baymani, Mandana; Mombeni, Mehran
September 2011
Advances in Environmental Biology;Sep2011, Vol. 5 Issue 10, p3338
Academic Journal
In order to investigate the effect of planting density on remobilization of accumulated dry matter of three rice cultivars in north-eastern region of Khouzestan Province(south-west of Iran), this research was conducted as a split plot using a Randomized Complete Block Design (RCBD) with three replications in the 2010 cropping season in the research field of Khuzestan Agricultural Research and Natural Resources Center(Shavoor agricultural research station).In this study, planting density in three levels (30*30, 25*25 and 20*20 cm²) was regarded as the main factor in the main plots and rice cultivars (Hamar, RedAbarbou and Gherdeh Ramhormoz) were regarded as the secondary factors in the sub plots. Results indicated that planting density significantly affected grain yield, the number of fertile tillers, the harvest index, dry matter remobilization of flag leaf, all leaves, stem and total remobilization and current photosynthesis. The highest and lowest grain yields were respectively observed in densities of 20*20 and 30*30cm². The difference between cultivars was significant for all the abovementioned attributes. Red Anbarbou cultivar with an average of 5369 kgha-1 had the highest grain yield. The interaction effect of densities and differences of cultivars was significant on all attributes. The highest grain yield belonged to Gherdeh Ramhormoz cultivar with an average of 5936 kgha-1 in 20*20 cm² density and the lowest yield was seen for Hamar cultivar in 30*30cm² density. Among the cultivars, the highest and lowest rates of dry matter remobilization occurred for Red Anbarboucultivar in 20*20 cm² density and Hamar cultivar in 30*30 cm² density respectively. Considering the higher yield of Red Anbarboucultivar in 25*25 and 30*30 cm² densities, this cultivar must be selected for cropping in the Khouzestan province. Furthermore, because cropping history and background, semi dwarf and high compressibility of Gherdeh Ramhormoz cultivar, its replanting in the north-eastern of Khouzestan province is recommended.


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