Project supported by the National Basic Research Program of China (Nos. 2005CB121101 and 2003CCB001);the Basic Research Program of Heilongjiang Province (Nos. GB05C201-01 and CC055303);the Field Station Foundation of the Chinese Academy of Sciences.
Phosphorus (P) is necessary for growth and nitrogen fixation, and thus its deficiency is a major factor limiting legume production in most agricultural soils. The effect of phosphorus supply on nodule development and ...