CHANGES OF RNase AND ACID PH0SPHATASE IN COMMON WHEAT UNDER PHOSPHORUS DEFICIENCY STRESS Comparison of soil acid phosphatase activity determined by different methods Comparative genetic analysis of Arabidopsis purple acid phosphatases AtPAP10, AtPAP12, and AtPAP26 provides new insights into their roles in plant adaptation to phosphate deprivation Interactive influence of nitrogen and phosphorus application rate on wheat yield in North Henan, China THE EFFECT OF PHOSPHORUS DEFICIENCY STRESS ON ACTIVITIES OF ACID PHOSPHATASE IN DIFFERENT CLONES OF CHINESE FIR Effects of nitrogen and phosphorus addition on soil phosphatase activity in different forest types