Effects Of Combined Application Of Phosphorus Fertilizer And Humic Acid On Growth,Yield And Phosphorus Fertilizer Utilization Of Quinoa

In order to provide the theoretical basis for quinoa yield increase and rational fertilization process,pot experiments were conducted with quinoa as experimental materials.Four levels of phosphorus?P 0,P 1,P 2,P 3,P ₂O₅:0,0.1,0.2,0.3 g/kg,respectively?and two levels of humic acid?HA0,HA1,0,1.0 g/kg?were set up to completely random combination.The effects of phosphorus fertilizer and humic acid on quinoa seedling growth,yield and apparent sequence were studied.The main results are as follows:In different growth stages and under the same humic acid treatment conditions,the results showed that the plant height,plant stem,leaf area,biomass,root surface area,average root diameter,root volume and main root length of quinoa increased first and then decreased with the increase of phosphorus application amount,reaching the maximum when phosphorus application amount was P2;under the same phosphorus application condition,applying humic acid to promote the growth of quinoa above ground and the root system,the effect of combined application of P2 and humic acid was the best.In different growth stages and under the same humic acid treatment conditions,the results showed that phosphorus application increased the root activity,the SOD activity,POD activity,CAT activity and soluble protein content of quinoa,and decreased MDA content,soluble sugar,proline and acid phosphatase.Under the same phosphorus application condition,humic acid application could effectively improve the root activity,antioxidant enzyme,soluble protein content of quinoa,and decreased the content of osmotic regulators.The effect of combined application of P1 and humic acid was the best.In different growth stages and under the same humic acid treatment conditions,the results showed that phosphorus application increased the plant P content,plant P uptake and plant P uptake efficiency of quinoa plants;Under the same phosphorus application conditions,application of humic acid effectively improved utilization of quinoa phosphorus;Under the condition of combined application of humic acid with P2,the plant P content,plant P uptake of quinoa reached the maximum,while phosphorus uptake efficiency was the highest under the condition of combined application of P1 and humic acid.Phosphorus application promoted quinoa yield under the same humic acid treatment conditions,and humic acid application increased quinoa yield,which significantly promoted the harvest index of quinoa,phosphorus fertilizer agronomic efficiency and partial productivity of phosphorus fertilizer.Under the condition of P1 combined with humic acid application,the agronomic efficiency and partial productivity of phosphorus fertilizer reached the maximum,which significantly improved the absorption of phosphorus fertilizer by quinoa and the utilization efficiency of phosphorus fertilizer.Phosphorus application can effectively improve soil nutrients and reduce soil pH value under the same humic acid treatment conditions,the combined application of phosphorus fertilizer and humic acid can significantly increase the content of soil alkali-hydrolyzed nitrogen,available phosphorus,available potassium and organic matter,and reduce soil pH value.The effect of humic acid combined with P1 on soil improvement was the best.Considering the effects of combined application of phosphorus fertilizer and humic acid on quinoa morphology,physiological index,yield and phosphorus absorption efficiency,quinoa was planted under the condition of P1?0.1 g/kg P2O5?combined with HA1?1.0 g/kg?could increase quinoa yield,promote the absorption of phosphorus fertilizer by quinoa,and improve the utilization efficiency of phosphorus fertilizer.