作物学报 ›› 2019, Vol. 45 ›› Issue (5): 764-776.doi: 10.3724/SP.J.1006.2019.84014
于显枫1,张绪成1,*(),方彦杰1,陈光荣1,王红丽1,侯慧芝1,马一凡1,赵记军2
Xian-Feng YU1,Xu-Cheng ZHANG1,*(),Yan-Jie FANG1,Guang-Rong CHEN1,Hong-Li WANG1,Hui-Zhi HOU1,Yi-Fan MA1,Ji-Jun ZHAO2
摘要:
优化垄沟配置方式、种植密度和施肥方式可显著提高降水利用效率、作物产量和水分利用效率。以西北半干旱区全膜覆盖垄上微沟种植马铃薯, 设置49,500株 hm -2(低密度)和64,500株 hm -2(高密度) 2个播种密度, 传统施肥(PM)、减量追施(PMN)、有机肥替代(PMO) 3个施肥模式, 随机区组设计。研究施肥和密度对马铃薯不同生育期土壤温度、阶段耗水量、产量及水分利用效率的影响。结果表明, 增密对土壤温度、叶绿素相对含量(SPAD)和产量无显著影响, 但降低了花前耗水量、单株地上生物量和水分利用效率, 提高了叶面积指数(LAI)和花后耗水量。在块茎膨大期, 高密度处理的LAI较低密度增加了3.64%~15.01%; 花后耗水量在2015—2016年较低密度增加了6.50%~ 48.52%。与PM 处理相比, PMN和PMO均能提高花前土壤温度、现蕾期-块茎膨大期的马铃薯叶片SPAD值和LAI, 其中LAI在花期增加了10.42%~44.26%。PMN和PMO降低了花前耗水量, 增加花后耗水量和地上生物量, 在块茎膨大期地上生物量较PM增加了6.95%~49.85%。PMN能提高低密度马铃薯的块茎产量和水分利用效率(WUE), 2015—2017年产量较PM和PMO分别提高了9.96%~20.87%和13.64%~17.61%, 水分利用效率提高了5.46%~20.81%和13.25%~45.24%。因此, 增加密度对产量和水分利用效率无显著影响, 但化肥减量追施或有机肥替代均可显著促进马铃薯花后耗水和提高LAI, 使马铃薯块茎产量和WUE显著增加, 是西北黄土高原半干旱区增产增效的养分管理模式。
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