Daily based quantitative nutrient management in rockwool hydroponics: Growth and yield of tomato and nutrient use at elevated CO2
Daily based quantitative nutrient management in rockwool hydroponics: Growth and yield of tomato and nutrient use at elevated CO2
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DOI：
10.2480/agrmet.66.4.4
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发表时间：
2010-12-01
影响因子：
1.3
通讯作者：
Takaichi, Masuyuki
中科院分区：
文献类型：
--
作者：
Matsuda, Ryo;Suzuki, Katsumi;Takaichi, Masuyuki
研究了CO2增浓条件下番茄岩棉水培每日定量养分管理（QNM）的效果。三个水平的营养供应的基础上，每天的水分吸收进行了比较，与传统的电导率（EC）为基础的管理。一个新开发的自动QNM系统与服务器和客户端控制器原型被用来控制养分供应。从2009年10月到2010年2月，温室中的植物被提供了0.5（S），1.0（M）或1.5（L）倍于正常CO2条件下的最佳每日营养量。EC为基础的管理产生最高的累计总产量在16周的果实收获，其次是L，M和S处理，在该顺序。EC管理、L和M处理的累计商品果产量无显著差异，但这三个处理的商品果产量均显著高于S处理。QNM处理的果实干物质含量和可溶性固形物含量与EC管理的果实基本相同或高于EC管理的果实。试验期间，S、M和L处理的养分用量分别为EC管理用量的10%、24%和42%。养分利用效率（NUE），定义为每单位的养分使用量的商品果产量，在所有三个QNM处理高于EC为基础的管理。因此，每日QNM可以减少营养素的使用，而不会降低果实产量和质量在CO2富集的条件下。M或L处理提供了果实产量和NUE之间的最佳平衡。L处理商品产量略高于M处理，但氮肥利用率低于M处理。
The efficacy of daily quantitative nutrient management (QNM) in tomato rockwool hydroponics under CO2-enriched conditions was tested. Three levels of nutrient supply based on daily water uptake were compared with conventional electrical conductivity (EC)-based management. A newly developed automatic QNM system with server and client controller prototypes was used to control nutrient supply. Plants in a greenhouse were supplied with 0.5 (S), 1.0 (M) or 1.5 (L) times the optimal daily amount of nutrients for normal CO2 conditions from October 2009 to February 2010. EC-based management produced highest cumulative total fruit yield during 16 weeks of fruit harvest followed by L, M and S treatments, in that order. There was no significant difference in cumulative marketable fruit yields in EC-based management, L and M treatments, but marketable yields from these three treatments were significantly higher than S treatment. Fruit dry matter content and fruit soluble solid content in QNM treatments were almost the same or higher than fruit grown in EC-based management. The amount of nutrient used during the experiment in S, M and L treatments was 10, 24 and 42%, respectively, of the amount used for EC-based management. Nutrient use efficiency (NUE), defined as marketable fruit yield per unit of the amount of nutrient used, in all three QNM treatments was higher than in EC-based management. Thus, daily QNM can reduce nutrient use without lowering fruit yields and quality under CO2-enriched conditions. The M or L treatment provided optimal balance between fruit yield and NUE. The L treatment gave slightly higher marketable yield but lower NUE than M treatment.