Assessing the effect of zeolite levels on grain yield, yield components and re-transfer of dry matter of rice) Oryza sativa L.) cultivars in Miyaneh region

A test was conducted in Achachi village by a split-plot factorial design in form of a completely randomized design model with three replications in 2017-2018. The treatments include three stress levels (a1: without stress (flooding), a2: irrigation interval per 10 days (from the beginning of clawing step), a3: irrigation interval of 20 days (since the clawing step), zeolite in two levels (b1: non-use (control), b2: 10 ton/ha), and cultivars in 4 levels (c1: Shahpasand, c2: local Tarom, c3: CT13382-8-3-M, c4: Sangjoo). The maximum yield was in a combination of flooding and zeolite use in cultivar of CT13382-8-3-M with an average of 5.9 ton/ha, and the minimum yield was in a combination of once every 20 days’ irrigation and non-use of zeolite in a cultivar of Shahpasand with the average of 1.06 ton/ha. The maximum transfer of the dry matter from the aerial parts was obtained when Sangjoo cultivar was irrigated once every 10 days in non-use of zeolite (816 kg/ha), and the share of grain re-transfer was reduced by increasing zeolite use. The other leaves have the main role of the dry matter re-transfer to the gain than the other parts (stem and flag leaf). In addition, its amount depends on the genotype and the environmental conditions and varied from -3.45 to 14.63%. The role of stems to transfer the dry matter to the grain was lower than the other aerial parts and in range of 2.5-16.7%. Totally, it seems that the re-transfer of the dry matter from the aerial parts of rice genotypes has an important role in filling the grains.