| Rice, as one of world’s staple food, its production ranks second in the world. Although theapplication of fertilizer could increase the production, but excess fertilizer would cause environmentalpollution.. In order to improve the utilization of silicon fertilizer and phosphate fertilizer, three differentlevels of silicon and phosphate fertilizer treatments were carried out, i.e., a total of nine treatments:Si0P0, Si0Pm, Si0Ph, SimP0, SimPm, SimPh, SihP0, SihPm, SihPhwith pot experikment. The contents ofdifferent fraction of silicon and phosphorus, total content of Si and P in rice plant as well as the yieldwere determined in our study,The results showed that available silicon content increased with the improvement of the level ofphosphorus.The content of available silicon reached a maximum at high silicon and high phosphorusfertilization (SihPh), indicated that the silicon-phosphorus fertilizer could increase the effectiveness ofavailable silicon. Amorphous silicon occupy a large proportion of paddy soil. Phosphorus fertilizer didnot have significant effect on the organic combination of silicon, Fe-Mn oxides of silicon andamorphous silicon in paddy soil.Silicon and phosphorus fertilizer could increased the effectiveness of available phosphorus,promotes the rice plants absorb phosphorus from the soil, improve the availability of phosphatefertilizers, and achieve the strongest bioavailability under middle phosphorus and middle siliconfertilizer (SimPm).Silicon and phosphorus fertilizer had significant effects on the contents of the organiccombination of silicon, Fe-Mn oxides of silicon and amorphous silicon in paddy soil. However, highsilicon with high phosphorus fertilizer might inhibit the availability of phosphorus, decrease theavailable phosphorus content in paddy soil and inhibit the absorption in rice plants, reduce theconversion between different silicon and phosphorus fractions.In rice plants，the remaining leaves gained the highest silicon content, which varied from15.37g/kg to30.00g/kg among the nine treatments, while the highest accumulating percentage of siliconwere found in stems and sheaths which varied from39.37%to44.26%; The brown rice gained thehighest phosphorus content which varied from24.62g/kg to33.00g/kg,the highest accumulatedpercentage of phosphorus was also found in brown rice whcich varied from55.88%to71.87%.Silicon-phosphorus fertilizer could promote the transfer of silicon to the sheath and stem leaves;improved phosphorus fertilizer level could contribute to the transport of silicon and the utilization ofsilicon fertilizer, but an excess of phosphorus application would bring the opposite effect. Meanwhile,the silicon-phosphorus fertilizer could also promote the transfer of phosphorus to brown rice, but anexcess of silicon fertilizer and phosphate fertilizer would inhibit the absorption and utilization ofphosphorus.Silicon-phosphorus fertilizer application could bring well growth in rice, but restrain the plantheight. The SimPmtreatment gained the highest total dry matter mass i.e.212.98g/pot, while theSimPhtreatment gained the highest brown rice mass which was105.20g/pot The total dry matter mass was increased with the increased fertilizer levels, but excess phosphorus application would reducethe yield of rice.Therefore, the study concluded that, the middle level of phosphorus and the middle level of silicon(SimPm, i.e., SiO20.25g/kg soil, P2O50.2g/kg soil) could have the best effect on the availablity ofsilicon and phosphorus in paddy soil. |
