豇豆的配方施肥模型

FERTILIZING MODELS OF ASPARAGUS BEAN

根据肥料效应函数法，采用三因素天水平回归设计的配方施肥研究表明，在灰棕紫泥土上每生产1000Kg豇豆需吸收N5．32Kg，P2O51．44Kg，K2O3．35Kg。据差减法计算，豇豆吸收N的46．8％、P2O5的21．7％、K2O的28％来自于土壤，其余养分则由施肥及根瘤菌作用补充。在配肥模式中，灰棕紫泥土壤氮∶磷∶钾施肥比例为1∶2∶2，黄色石灰土施肥比例为1∶2．5∶2，而单施氨、磷、钾肥，每公顷分别达到N45kg，P2O567．5kg，K2O60Kg后，豇豆产量明显下降。表明氮、磷、钾的用量都应控制在一定范围内。

Fertilizing trials were conducted with regression design of 3 fators and 5 levels in the gray-brown purple clay soil and yellow limestone soil of Chongqing. Results indicated that 5. 23kg N, 1. 44kgP2O5, and 3. 35K2O were needed for yielding 1000kg of beans. Asparagus bean absorbed 48. 6% of P2O5, 21. 7% of N and 28. 0% of K2O from soil, others were supplemented by fertilizing and root nodule bacterium. In the balanced fertiiizing model ratio of N: P2O5: K2O was 1: 2:2 for the gray-brown purple soil and 1: 2. 5 : 2 for the yellow limestone soil. Asparagus bean yield decreased significantly when 4 5kg N or 65kg P2O5 or 60Kg K2O per hectare were applied, respectively. The results indicated that applied nitrogen,phosphate and potassium should be controlled in a certain range.