Calcium superphosphate is a major resource of phosphorus(P)used in China agriculture,but its P utilization efficiency is......

油菜施用氮、磷、钾＂3414＂肥效试验结果表明：在黄州区当地试验条件下,合理的氮、磷、钾肥施用量可显著提高油菜产量,施肥不足或过量会......