摘要
针对无土栽培营养液循环系统中离子供应和吸收不平衡形成的营养液浓度增高、盐分增加 ,对产量和品质的影响 ,该文就不同蒸腾条件下 ,番茄对高盐分的反应进行了试验和分析。结果表明 :当营养液电导度 EC ( m S/cm)超过 2时 ,每增加一个 EC单位 ,上市的鲜重生产效率降低 5 .1% ,而收获的果数未受到影响 ,因此产量的降低主要是由于单果重的降低 ( 3 .8% )和非上市果数 (主要是蒂腐果 )的增加所致 ;控制环境 ,抑制蒸腾 ,上市的鲜重生产效率仅降低 3 .4 % ,与单果重的降低一致。根部高盐分没有影响单果干重的积累 ,温室内蒸腾控制对果实干重积累的影响也甚微。这一结果表明 :温室内蒸腾控制与根部盐分控制对产量有同样的重要性 。
For the reason of high concentration or high salinity in closed growing system, due to unbalance of supply and absorption of ions in nutrient solution, the response of tomato plants to high salinity was analyzed under normal and controlled climate (potential transpiration) in greenhouses. Two climate treatments, a reference (high transpiration, HET 0) and a “depressed” transpiration (low transpiration, LET 0), were combined with two salinity treatments in 4 pairs: salinity EC (electrical conductivity, mS/cm ) 6.5 , 8.0, 9.5 always coupled with a reference EC 2, and both EC 9 but a comparison of concentrated nutrients and nutrients with sodium chloride. It was shown that marketable fresh yield production efficiency decreased by 5.1% for each EC unit in excess of EC 2. The yield loss resulted from reduced fruit weight (3.8% per EC unit) and an increased fraction of unmarketable harvest because the number of harvested fruits was not affected. At the LET 0 treatment, yield loss was only 3.4% per EC unit in accordance with the reduction in fruit weight. Neither EC nor climate treatments affected individual fruit dry weight. It is concluded that transpiration control in a greenhouse have the same importance for tomato production as salinity control in root environment. And depressed transpiration may reduce the negative effect of high salinity on tomato yield.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2001年第6期85-89,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
荷兰农业部
荷兰与以色列合作研究项目资助
山西省政府和世界实验室奖学金 (瑞士
日内瓦 )
关键词
温室
盐分胁迫
蒸腾控制
番茄
产量
greenhouse
salinity stress
transpiration control
tomato (Lycopersicon esculentum)
yield
