Effect of foliar application of zinc nano oxide on agronomic traits of two varieties of rice (Oryza sativa L.)

In order to investigate-the effects of foliar application of nano zinc oxide on agronomic characteristics of two rice varieties, an experiment was conducted in personal research farm located in the Amol city in 2014. The experiment was conducted as a split plot in a randomized complete block design with three replications. The treatments included main factor cultivars in two levels (Tarom and Shiroodi) and sub-factor was foliar application of zinc nano oxide in five levels (S1: Non-sprayed, S2: Spraying 20 ppm in mid-tillering and panicle initiation, S3: spraying 20 ppm in panicle initiation and full heading, S4: Spraying 40 ppm in mid-tillering and panicle initiation and S5: Spraying 40 ppm in panicle initiation and full heading). The results showed that Tarom compared with the Shiroodi was successful only in plant height (147.63 cm) and the percentage of spikelets per panicle (88.99). The highest height, number of spikelets per spike, biological yield, grain yield and straw yield were achieved with treatments S3 and S5. The highest number of tillers per hill belonged to treatments S2, S4 and S5, respectively. Also, the maximum 1000-grain weight (27.58 g) and longest clusters (28.98 cm) were achieved under treatments S5 and S4, respectively. Finally, the highest height was 151.9 and 154.5 cm under interactions of S2 × V1 and S4 × V1, respectively. While the highest 1000-grain weight was 28.16 and 28.80 g under interactions of S3 × V2 and S5 × V2, respectively.