犍为县农田养分平衡研究
杨玉国, 张锡洲, 陈光辉
Study on the Farmland Nutrients Balance and the Dynamic Variation Tendency of Soil Nutrients in Qianwei County
YANG Yu-guo, ZHANG Xi-zhou, CHEN Guang-hui
四川农业大学学报 . 2002, (03): 249 -252 .  DOI: 10.16036/j.issn.1000-2650.2002.03.017