江淮丘陵区大蒜钾氮配施增产效应研究

通过多年田间试验，研究了江淮丘陵区大蒜钾氮配施的增产效应，结果表明：增施钾肥具有显著的增产效果，蒜苔增产28.7%~39.7%，蒜头相应产量提高19.5%~28.2%，平均增产率为36.4%和24.1%。钾肥的增产效率在两种氮肥水平下都较高，单位钾肥的增产量与土壤有效钾含量及施钾量呈极显著负相关；氮肥的增产效率除与土壤有效N含量有关外，还受施钾量和土壤有效钾含量的影响。应用逐步回归分析方法，建立了蒜苔和蒜头单位钾和N肥的增产数量与土壤有效钾、氮含量和施钾、施氮量的回归方程。

Effect of Potassium Application on Garlic Yield Response in Yellow-drab Soil Jianghuai Hilly Land

Six field experiments of response of garlic yield to K application combined with N were conducted from 1998 to 2001 in Yellow-drab soil Jianghuai hilly land. The results shown that there was a remarkable response of garlic yield to potassium application, the increases of garlic bolt and clove yield was 28.7%~39.7% and 19.5%~28.2% with the average of 36.4% and 24.1% respectively compared with the control. The yield increase of K fertilizer was quite high at two rates of nitrogen application, and it closely relative to the content of available K in soil and potassium application rate. The yield increase of N fertilizer was affected by the content of soil available N as well as potassium application and the content of available K in soil. The liner regression equations were developed with the method of stepwise regression analysis between the variables of the yield increase per K or N fertilizer of garlic bolt or clove (y) with that of the content of available K (x1) or N (x2) in soils and potassium or nitrogen application (x3) and (x4) respectively.