Effects Of Silicon On The Strength Of Rice Stem

Dense high-yield has become the consensus of scientific research in the rice field. The lodging caused by dense which serious impact on rice yield enhancement and quality improvement is a common concern. Silicon is a useful element in plants which can change the plant type and the promotion of photosynthesis, enhance lodging resistance and raise the level of rice yield. Therefore, the two rice varieties, Liangyoupeijiu and 9311,was as the tested material. The experiment set up three density and four silicon concentrations to explore the silicon on rice stem strength and related traits.The results are as follows.1.The rice yield of Liangyoupeijiu and 9311 in high-density level was maximum, respectively 9371.10kg/hm2 and 9279.15kg/hm2,were more than the low-density, which increased respectively 36%,29.9%.The average yield of Liangyoupeijiu and 9311 in silicon treatments were respectively 8412.45kg/hm2,8335.50kg/hm2,and the yield increasd 27.95%,18.71%,the rice yield was the significant difference. Namely, silicon has the role on rice with increase yield.2. The effect of silicon on rice plant height and elongation internonde lengths both were not significant.The internodes length size of stem was the second elongate section>the third elongate section>the first elongate section. The size of stem diameter, stem wall thickness were increased with SiO2 increased. The largest stem diameter, stem wall thickness of Liangyoupeijiu increased respectively 18.13% and 36%,9311 are increased respectively 12.37% and 20% compared with the control. So silicon could significantly increase the rice stem diameter, stem wall thickness.3.Unit fresh weight, dry weight, water content of rice stem sections were all the base of the first elongate section>the second elongate section>the third elongate section.In silicon treatment, unit fresh weight and water content of rice stem sections both are not significant difference at full heading. But the unit fresh weight and water content increased when the silicon concentration increased 15 d and 30 d after the full heading.With silicon increased, unit dry weight of rice stem increased. The maximum value were higher than the control, respectively 19.41%,19.64% and 17.9%,at full heading,full heading 15 d,30 d.4. The SiO2 content of rice stem was the first elongate sectionthe second elongate section>the third elongate section. Silicon could increase the breaking-resistant strength of Liangyoupeijiu and 9311,and it reached the maximum in content 135kg/hm2 or 90kg/hm2 of SiO2. At full heading, full heading 15 d,30 d, the stem breaking-resistant strength compared with the control increased 19.61%, 20.61%,40.89%.The breaking-resistant strength and SiO2 content were significant or highly significant positive correlation.