Comparison of Two Genetic Maps of Soybean constructed by RIL Populations Derived from Combinations of Peking×7605 under Two Ecological Sites Regional yield variations and optimized application amounts of nitrogen of mid-season hybrid rice in Southwest China Characteristics of Nutrient Uptake and Utilization of Mid-Season Hybrid Rice under Different Nitrogen Application Rates in Different Locations of Southwest China Relationships between ecological site quality and site index of lodgepole pine and white spruce in Northern British Columbia