采用“3414”试验设计，研究了制种紫花苜蓿氮、磷、钾肥料效应及推荐施肥量。结果表明，在干旱盐碱条件下，随着施肥量的增加，紫花苜蓿种子产量亦逐渐提高，施氮增产0.84%～17.37%，施磷增产51.38%～59.63%，施钾增产-0.58%～1.3%。与无肥处理相比，所有处理均增产，增产率在11%～79%。氮钾和磷钾互作效应降低紫花苜蓿种子产量，而氮、磷互作效应提高紫花苜蓿种子产量。与产量最高的中磷处理相比，缺氮、缺磷和缺钾处理的相对产量分别为85.2%、62.64%和98.56%。结合肥料效应函数法和养分丰缺指标法，得出河西走廊干旱盐碱条件下制种紫花苜蓿推荐年施氮(N)、磷(P2O5)和钾(K2O)的量分别为100、190、60 kg/hm2。

The field experiment which used 3414 balance application design was carried out to study the effects of alfalfa seed production on N， P and K fertilizer and recommended fertilizer amount. The results showed that under the conditions of drought and salinity， nitrogen application the seed yield of alfalfa by 0.84%～17.37%， phosphorus application increased the yield by 51.38%～59.63%， and potassium application increased the seed yield of alfalfa by -0.58%～1.3%. Compared with no-fertilizer treatment， the yield of all treatments was increased， and the seed yield increased rate was between 11% and 79%.The interaction between N-K k and P-K decreased the seed yield of alfalfa， while the interaction between N and P increased the seed yield of alfalfa. Compared to the highest yield medium phosphorus treatment， the relative yields of nitrogen， phosphorus and potassium deficiency treatments were 85.2%， 62.64% and 98.56%， respectively.Combined with fertilizer effect function method and nutrient abundance index method， It concluded that the recommended annual application of nitrogen (N)， phosphorus (P2O5) and potassium (K2O) is 100， 190 and 60 kg/hm2 respectively.

S565.4

国家农业部科学技术推广项目。