title: [Effects of phosphorus fertilization on yield of winter wheat and utilization of soil nitrogen].
abstract: In order to evaluate the threshold of phosphorus (P) application rate and improve the utilization efficiency of fertilizers in Baoding region of Hebei Province, a field experiment was conducted to examine the impacts of P fertilization on wheat yield, soil NO(3-)-N and nitrogen use efficiency. Results showed that, compared with the CK (P0), all treatments with P application (P1, 120 kg · hm(-2); P2, 240 kg · hm(-2) and P3, 480 kg · hm(-2)) increased the plant height, flag leaf areas and total leaf areas per plant of winter wheat, which was conducive to the accumulation of photosynthetic products. In addition, P application increased the spike number, kernels per spike and yield of winter wheat but slightly decreased the grain mass per 1000 seeds. Of the P-fertilized treatments, P2 had the highest wheat yield of 6102 kg · hm(-2), which was similar to P1 but significantly greater than those of P0 and P3. Furthermore, P fertilization reduced the NO(3-)-N content in top soil layer although the total accumulation of NO3- was still rather high. The N grain production efficiencies (GPE(N)) and N uptake efficiencies (UE(N)) of P1 and P2 were similar but greater than the other treatments. The use efficiency (UR(P)) , agronomic efficiency (AE(P)) and partial productivity of P fertilizer (PFP(P)) in P1 were significantly greater than P2 and P3. In conclusion, the P application rate of 120 kg · hm(-2) (P1) in this study could be an appropriate threshold in Baoding, Hebei, from the aspects of wheat yield, nitrogen and phosphate use efficiencies and accumulation of soil NO3-.
authors.forename: Dan
authors.initials: D
authors.lastname: Xing
authors.forename: Shu-wen
authors.initials: SW
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Xia
authors.forename: Hong-da
authors.initials: HD
authors.lastname: Wen
mesh_terms: D000383:Agriculture; D005308:Fertilizers; D009566:Nitrates / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis*; D010788:Photosynthesis; D018515:Plant Leaves / Q000254:growth & development; D012621:Seasons; D012639:Seeds; D012987:Soil; D014908:Triticum / Q000254:growth & development / Q000378:metabolism*
chemical_list: D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D010758:Phosphorus; D009584:Nitrogen