Abstract:

Reducing fertilizer application and increasing efficiency is of great significance to ensuring the sustainable development of agriculture.Research on the impact of new-type synergistic compound fertilizers on rice nutrient absorption and yield will help ensure the food security.Four treatments which were conventional compound fertilizer(CG),synergistic compound fertilizer(ZZ),conventional compound fertilizer reduction by 20%(80% CG),and synergistic compound fertilizer by 20%(80%ZZ)was set.The results showed that:Compared with the conventional compound fertilizer treatment,the synergistic compound fertilizer treatment could increase the fresh weight,plant height,SPAD value and root volume of rice at tillering stage,jointing stage,heading stage,filling stage and maturity stage.At the maturity stage,the fresh weight,plant height,SPAD value and root volume of rice plants treated with the synergistic compound fertilizer increased by 11.71%,1.29%,8.02% and 46.48%,respectively.The rice plant treated by the synergistic compound fertilizer reduced by 20% treatment increased by 2.29%,0.31%,3.70% and 4.09%,respectively.Compared with the conventional compound fertilizer treatment,the synergistic compound fertilizer treatment could increase the dry matter weight of stems and leaves and the dry matter weight of grains by 24.46% and 21.39%,respectively.The synergistic compound fertilizer treatment to increase the dry matter weight of rice stems and leaves and the dry matter weight of grain was 6.07% and 8.15%,respectively.Compared with the conventional compound fertilizer treatment,the nitrogen content of rice stems and leaves and the nitrogen content of grains under the treatment of synergistic compound fertilizer increased by 10.68% and 36.96%,respectively.The phosphorus content of rice stems and leaves increased by 26.51% and 11.24%,respectively.The phosphorus content of rice grains treated with synergistic compound fertilizer increased by 10.39%,and the phosphorus content of rice grains treated with synergistic compound fertilizer reduced by 20% decreased by 5.41%.Compared with the conventional compound fertilizer treatment,the potassium content in the stems and leaves of rice treated with the synergistic compound fertilizer increased by 19.91%,the potassium content in the rice grains decreased by 15.83%,and the potassium content in the stems and leaves of the synergistic compound fertilizer reduced by 20% treatment decreased 6.56%,the potassium content of grains increased by 0.62%.Compared with conventional compound fertilizer treatment,the yield of rice treated with synergistic compound fertilizer increased by 22.02% and the difference was significant.The yield of rice treated with synergistic compound fertilizer reduced by 20% increased by 1.12%.The rice panicle length,panicle number,grain number per panicle,1 000-grain weight and seed setting rate of rice of synergistic compound fertilizer were the highest among all the treatments.In summary,the synergistic compound fertilizer can improve the growth index of rice in each growth period,improve the nitrogen absorption,phosphorus absorption and potassium absorption of rice,and increase crop yield.Compared with conventional compound fertilizer,the 20% reduction treatment of synergistic compound fertilizer can realize the reduction of chemical fertilizer without reducing production,and it is worthy of further popularization and application.

Key words: Rice, Yield, Growth index, Nutrient absorption, New type synergistic compound fertilizer