Nitrogen retention within a watershed reduces the amount of N exported to the ocean;however,it worsens environmental pro......

Alpine meadow,with limited plant-available nitrogen (N) by decomposition constraints,may be quite capable of retaining a......

将２５０只１日龄健康肉用雏鸡随机分为五组，分别饲喂赖氨酸，精氨酸比例为１．４８：１，１．２２：１，１．１８，１：１．１４５和１：１．７５的玉米－豆粕型日粮。试验结果表明，不同Ｌ／Ａ比例对肉鸡的生产性能有显著......