北京市冬小麦氮肥适宜用量评价方法的研究_贾良良.pdfVIP

　 2001, 6( 3): 67～ 73 Journal of China Agricultural University ① ② 贾良良 　 陈新平　 张福锁 刘宏斌　 吴健繁 () 　　 () 　　 199 — 1999 10 6 , , 1 0 - 2, kg hm 。 、 、 4, , 2, 50% , 20% , 10% ; , 10 2, 2 1～ 90 - 2 , 4 91～ 200 - 2 , 2 201～ 242 kg h m kg h m kg - 2 - 2 hm ; 10 119 kg hm 。 , , 0% 200 - 2 , 201～ 242 - 2。 kg hm kg h m 。 　 ; ; 　 S143. 1 Study of Optimum N Supplying Rate in Winter Wheat in Beijing Area Jia Liangliang　 Chen Xinping　 Zhang Fusuo ( College of Natural Resources and Environmental Sciences, CAU) Liu Hongbin　 Wu Jianfan ( Station of Soil and Fertilizer, Beijing) 　 6 Abstract Ten experiments with fertilizer N in levels were conducted in Beijing area in 199— 1999. The yield in most sites did not decrease with N fertilizer rate increase w hen N - 2 fertilizer rate exceeded 1 0～ 270 kg hm , but kept as a plateau. In all of ten sites, the effect of N fertilizer on wheat yield could be simulated by linear plus plateau model in six sites, by quadratic model in one site, by quadratic plus plateau model in one site, and could not be fitted into any models in another two sites. The average rate of optimum N 119 - 2 . , 20% fertilization w as kg hm in the ten experiments Of all of