7Riethoven J J M, Ten Berge H F M, Drenth H. SARP Research Proceedings-Software Developments in the SARP Project: A Guide to Applications and Tools. Wageningen: Grafisch Service Centrum van gils B V, 1995. 75 - 144.
8Ten Berge H F M, Thiyagarajan T M, Shi Q H. Numerical optimization of nitrogen application to rice. Part I. Description of MANAGE-N. Field Crops Research, 1997, 51:29 - 42.
二级参考文献6
1娄尔行（译）.论财务会计概念[M].北京:中国财政经济出版社,1992..
2秦祖升，生态学报，1988年，8卷，1期，10页
3严昶升，燕辽易旱区生态农业的雏型，1988年
4郭俊尧，生态学报，1987年，7卷，1期，12页
5N. C. Stutterheim,JM Barbier,B Nougaredes. The efficiency of fertilizer nitrogen in irrigated, direct seeded rice (O. sativa L.) in Europe[J] 1994,Fertilizer Research(3):235～244
