在兰州二阴地区明确紫叶莴笋适宜的施磷量，为紫叶莴笋的优质高效生产和土壤健康发展提供科学依据。试验共设4个施磷量处理，低磷水平(144 kg/hm2)、中磷水平(180 kg/hm2)、高磷水平(216 kg/hm2)、对照(CK，不施磷)，研究了对紫叶莴笋产量和品质的影响。结果表明，与不施磷处理相比，不同施磷处理的紫叶莴笋株高提高5.34 %～11.48%、茎粗提高18.07%～34.92 %，产量增加37.80%～52.44%，茎部游离态氨基酸含量提高8.01%～39.50%，Vc含量提高4.08%～12.91%，其中以施磷量为180 kg/hm2(中磷水平)处理的株高、茎粗、单株重、产量、茎部游离态氨基酸和Vc含量最高，施磷量为216 kg/hm2(高磷水平)处理次之。施磷量为144 kg/hm2(低磷水平)的硝酸盐含量较不施磷处理降低了4.95%，而施磷量为180、216 kg/hm2处理较不施磷处理分别提高78.22%、103.96%。综合评价，中磷水平处理在兰州二阴地区紫叶莴笋的主要性状、产量及品质最优，即在施N 525 kg/hm2、K2O 375 kg/hm2的条件下，适宜的施P2O5量为180 kg/hm2，建议在当地推广。

This study investigates the impact of mulched ridge cultivation on soil nutrient contents and potato production performance, aiming to provide a theoretical basis for soil fertility improvement, fertilizer use rates, and the development of rainwater harvesting cultivation techniques in drylands to support high-quality, high-yield potato production. With conventional ridging as control(CK), three treatments were established: full-film double ridge farming(FRF), spring film ridge with micro-furrow rainwater harvesting (SRF), and autumn film ridge with micro-furrow rainwater harvesting (ARF), to assess effects on soil available soil nitrogen (N), phosphorus (P), and potassium (K) contents, potato yield, and N, P and K fertilizer use rates. Results showed that compared with CK, all mulched treatments significantly increased available N, P and K contents in the 0 to 60 cm soil layer. ARF treatment achieved the highest 3-year average potato yield at 48 210.9 kg/ha, significantly higher than CK. Mulched ridge cultivation significantly improved partial factor productivity (PFP) of N, P and K fertilizers, with ARF being the most effective. Compared to CK, the average 3-year increases in PFP for N, P, and K fertilizers were 48.1%, 43.2%, and 27.7%, respectively. Agronomic efficiency (AE) was highest under ARF in all years, and the average AE over three years followed the order as P > K > N. In conclusion, ARF has a clear advantage in improving soil fertility, fertilizer utilization, and potato yield, making it one of the preferred high-yield, efficient potato cultivation techniques in dryland regions.

S147.22