Changes of growth and phosphorus utilization of highland barley under excessive phosphorus application
To explore the upper limit of phosphorus fertilizer application for the main highland barley varieties and new highland bar-ley strains,and find out the characteristics of growth,development,and nutrient absorption and utilization of new highland barley va-rieties(lines)under excessive phosphorus application,five treatments were set up,including control without phosphorus application(CK),conventional phosphorus application treatment(P1),and excessive phosphorus application treatments(P2,P3,P4),to study the changes in growth and phosphorus absorption and utilization of highland barley under excessive phosphorus application.The appli-cation rates of P2O5 in the five treatments were 0,56.2,138.5,220.8 and 277.0 kg/hm2,respectively.The results showed that the highest tillering number of highland barley increased with the increase of phosphorus fertilizer application amount.Applying phospho-rus could increase the number of mature ears of highland barley,but excessive phosphorus application could reduce the number of ma-ture ears of highland barley.Applying phosphorus fertilizer could increase the plant height of highland barley,but when the amount of phosphorus fertilizer increased to a certain extent,the increase in plant height of highland barley was not significant.Applying phos-phorus fertilizer could increase the average and maximum filling rates of highland barley,and with the increase of phosphorus applica-tion rate,they first increased and then decreased.The phosphorus fertilizer utilization efficiency,phosphorus fertilizer agronomic utili-zation efficiency,phosphorus fertilizer partial productivity,and yield of the two highland barley varieties(lines)showed a decreasing trend with the increase of phosphorus application amount.The above analysis showed that excessive application of phosphorus fertilizer would lead to a decrease in the number of ears of highland barley and a significant decrease in phosphorus fertilizer utilization efficiency.
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