摘要
为了阐明沼液替换营养液比例与水培生菜生育阶段、产量、品质及光合特性之间的关系,筛选出最佳沼液替换比例,采用深液流水培法,以生菜为材料,研究了不同生育阶段沼液替换比例对生菜产量、品质及光合特性的影响,并分析了叶绿素a与光合参数的关系。结果表明,沼液替换部分营养液显著提高了生菜产量(P<0.05),且不同生育时期沼液对生菜产量的影响规律一致,当生菜生长中期(第2个生育阶段)沼液替换比例为20%,末期替换比例为40%时生菜生物量最高,高出CK(以原山崎配方配制营养液水培生菜)66.97%;沼液替换部分营养液的各处理的生菜可溶性糖与CK相比显著提高,且差异极显著(P<0.01);可溶性蛋白有一定程度提高,但差异不显著;生菜的硝酸盐量显著降低,同时生菜VC量随着沼液置换比例的增加而降低。沼液替换部分营养液提高了生菜叶片叶绿素a,促进生菜光合作用的进行。故生菜第2个生育阶段沼液替换营养液对生菜产量、光合特性及品质调控效应较好,且以40%沼液替换比例效果最佳。
We developed two gravel filters to resolve the difficulties associated with pipe-drain used to drain farm- land under drip irrigation when soil is under unsaturated condition. Soil tank experiment was conducted to test their efficacy in comparison with conventional filter in which fine sands were laid around the drain pipe. In the proposed filters, fine sands were either laid on the top of the drain pipe （T2）, or obliquely connected tothe pipe. The results showed that in contrast to the control in which there was a significant delay or failure in drainage and- water and salt accumulated on the bottom of the pipe, the proposed two filters produced a local saturated zone above the pipe, facilitating water movement and drainage. The T3 filter took less time to drain the water than T2 and was hence more efficient to drain water and salt out of the soil.
出处
《灌溉排水学报》
CSCD
北大核心
2017年第7期55-59,85,共6页
Journal of Irrigation and Drainage
基金
国家863计划项目(2013AA103004)
关键词
沼液
生菜
生育阶段
产量
品质
光合特性
drip irrigation
buried pipe drainage
salt leaching
gravel envelope structure
