Effects of Irrigation Height on Growth and Fertilizer Utilization of Cucumber Plug Seedlings under Ebb-and-flow Irrigation System
LI Qian1，DONG Chun-juan1，TIAN Ya-nan2，CAO Ling-ling2，SHANG Qing-mao1*
1Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Key Laboratory of Biology and Genetic Improvement of Horticultural Crops，Ministry of Agriculture and Rural Affairs，Beijing 100081，China；2Beijing Agricultural Technology Extension Station，Beijing 100029，China
在潮汐灌溉条件下，以黄瓜品种中农18 号为材料，分别在夏季和冬季进行穴盘育苗，比较1、2、3 cm 供液高度对基质的吸水速率、黄瓜穴盘苗表观生长指标、根系活力、水分及氮素利用率的影响。结果表明：随着供液高度增加，基质吸水速率逐渐加快；夏季和冬季育苗供液高度为2 cm 和3 cm 时，穴盘苗的株高、叶面积、茎叶鲜质量和干质量均高于1 cm供液高度，3 个供液高度间的根体积、根系鲜质量和干质量、根冠比、壮苗指数无显著差异，但3 cm 供液高度的穴盘苗根系活力显著降低，供液和回液体积以及肥料施用量最大；而夏季育苗2 cm 供液高度时，穴盘苗的水分利用率较高，且氮素利用率最大。基于穴盘苗表观生长指标与水肥利用率，夏季和冬季黄瓜潮汐穴盘育苗的适宜灌溉高度均为2 cm。
Under ebb-and-flow irrigation system，taking cucumber variety ‘Zhongnong No.18’ as material，this study carried out plug seedling culture in summer and winter，and compared the effects of different irrigation height（1 cm，2 cm and 3 cm）on water absorption rate of substrate，growth indexes of cucumber plug seedlings，root system vigor，and water and nitrogen use efficiency．The results showed that the water absorption rate of substrate accelerated gradually along with the irrigation height increasing．In summer and winter，when irrigation heights were 2 cm and 3 cm，the plug seedling height，leaf area，shoot fresh weight and dry mass were all higher than the 1 cm irrigation height，while the indexes of root volume，root system fresh weight and dry mass，root-shoot ratio and strong seedling index showed no significant differences among the 3 irrigation heights．However，the root system activity of plug seedlings at 3 cm irrigation height was significantly decreased，and the volume of feed and return liquid and application amount of fertilizer were the largest．In summer，the water and nitrogen use efficiency of plug seedlings was the highest under 2 cm irrigation height．Based on the growth indexes and water/fertilizer use efficiency of plug seedlings，in summer and winter，the suitable irrigation height was 2 cm for cucumber plug seedlings under ebb-and-flow irrigation．
李倩，董春娟，田雅楠，曹玲玲，尚庆茂. 潮汐灌溉供液高度对黄瓜穴盘苗生长发育与水肥利用的影响[J]. 中国蔬菜, 2020, 1(1): 56-62.
LI Qian，DONG Chun-juan，TIAN Ya-nan，CAO Ling-ling，SHANG Qing-mao. Effects of Irrigation Height on Growth and Fertilizer Utilization of Cucumber Plug Seedlings under Ebb-and-flow Irrigation System. China Vegetables, 2020, 1(1): 56-62.
