摘要
以炸条型马铃薯品种‘抗疫白’(Kennebec)为供试材料,设计6个施氮水平,通过田间小区试验,研究不同施氮量对马铃薯产量和叶面积指数的影响。施氮量与马铃薯产量的关系用二次函数拟合效果良好,方程为y=-0.0012x^2+0.3717x+18.6720,对方程求导,当施氮量达到154.8 kg/hm^2时产量达到了最大值47.5 t/hm^2。不同时期的叶面积指数与产量的关系用二次方程拟合效果良好,对方程求导,获得的叶面积指数适宜的范围,出苗后20,30,40,50,60,70,80和90 d的叶面积指数依次为2.35-2.62,2.84-3.20,4.19-4.66,5.23-5.60,4.31-5.04,4.29-4.96,3.53-4.10和2.78-3.42。
French fry potato 'Kennebec' was fertilized at six nitrogen rates in a plot experiment, and the effects of different nitrogen rates on potato yield and leaf area index were studied. With the increase of nitrogen rate, the yield of 'Kennebec' increased at first and then decreased, and the relation of nitrogen rate and potato tuber yield could be described by a quadratic function, y=-0.0012x^2+0.3717x+18.6720. The yield of 'Kennebec' reached 47.5 t/ha of maximum value, when the nitrogen rate was at 154.8 kg/ha. The relation of leaf area index and potato tuber yield could also be described by quadratic function, with the optimal ranges of leaf area index were 2.35-2.62, 2.84-3.20, 4.19-4.66, 5.23-5.60, 4.31-5.04, 4.29-4.96, 3.53-4.10 and 2.78-3.42 for 20, 30, 40, 50, 60, 70, 80 and 90 days after the emergence, respectively.
出处
《中国马铃薯》
2014年第4期212-216,共5页
Chinese Potato Journal
基金
"十二五"农村领域国家科技计划课题(2012BAD06B02-05B)
黑龙江八一农垦大学省作物学重点学科学术骨干科研启动基金项目(ZWXQDJ-9)