1. Dep. of Crop; Soil, and Environmental Sciences, Univ. of Arkansas; Fayetteville AR 72701
2. Syngenta Seeds; 2369 330th St. Slater IA 50224
3. College of Agriculture; Northwest Univ. of Agriculture and Forestry; Yangling Shaanxi 712100
4. Institute of Crop and Nuclear Technology Utilization; Zhejiang Academy of Agricultural Science; Hangzhou Zhejiang 310021 P.R. China