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首页> 外文期刊>Journal of the American Society for Horticultural Science >Model-based control of nutrient solution concentration influences tomatogrowth and fruit quality
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Model-based control of nutrient solution concentration influences tomatogrowth and fruit quality

机译：基于模型的营养液浓度控制影响番茄的生长和果实品质

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Diurnal changes in microclimate in a greenhouse are often greater than changes in daily averages over weeks or months. Thus, one may hypothesize that changing the nutrient solution concentration supplied to plants at intervals less than one day would improve tomato yield and quality. To test this hypothesis research was conducted to compare four nutrient control strategies for their effects on plant growth, fruit yield, fruit quality, and root characteristics of 'Counter' tomato [Lycopersicon esculentum (L.) Mill.]. The four strategies were 1) ECvariable, adjustment of nutrient solution electrical conductivity (EC) at 15-min intervals according to greenhouse microclimate over the previous 15-min and empirical models of photosynthesis and transpiration; 2) ECdaily, daily adjustment of nutrient solution EC based on each morning's 24-hour weather forecast; 3) EC3.7, supply of a single high nutrient solution of 3.7 dS.m(-1); or 4) EC1.5, low nutrient solution EC of 1.5 dS.m(-1) for the entire growth period. Mean effluent EC levels were 1.8 dS.m(-1) for treatment EC1.5, 5.1 dS.m(-1) for treatment EC3.7, 3.6 dS.m(-1) for treatment ECdaily, and 3.4 dS.m(-1) for treatment ECvariable. Except for fresh weight (FW) of roots, growth characteristics did not differ significantly among treatments. Total production averaged 12.2 kg.m(-2) FW and 1.0 kg.m(-2) dry weight (DW); and fruit yield averaged 6.7 kg.m(-2). Dry matter content, yield loss to blossom-end rot, and firmness responded linearly to treatment EC. In general, ECdaily yielded higher fruit quality and ECvariable lower fruit quality than that predicted by linear regression. Although our strategy of short-term dynamic changes of nutrient solution EC according to changes in climate variables did not increase yield, daily adjustment of nutrient solution EC improved external fruit quality characteristics and may be practical for grower adoption.
机译：温室中小气候的日变化通常大于数周或数月的日平均变化。因此，可以假设以少于一天的时间间隔改变提供给植物的营养液的浓度将提高番茄的产量和品质。为了检验该假设，进行了研究以比较四种营养控制策略对“反”番茄[Lycopersicon esculentum（L.）Mill。]对植物生长，果实产量，果实品质和根系特性的影响。这四种策略是：1）EC变量，根据过去15分钟的温室小气候以及光合作用和蒸腾的经验模型，以15分钟为间隔调整营养液电导率（EC）。 2）EC，每天早晨根据每天的24小时天气预报对营养液EC进行每日调整; 3）EC3.7，提供3.7 dS.m（-1）的单一高营养液;或4）EC1.5，整个生育期内1.5 dS.m（-1）的低营养液EC。 EC1.5处理的平均废水EC水平为1.8 dS.m（-1），EC3.7处理的平均废水EC水平为5.1 dS.m（-1），EC EC每天处理为3.6 dS.m（-1）和3.4 dS.m （-1）治疗ECvariable。除根的鲜重（FW）外，各处理之间的生长特性没有显着差异。平均总生产量为12.2 kg.m（-2）FW和1.0 kg.m（-2）干重（DW）;果实平均产量为6.7 kg.m（-2）。干物质含量，开花期腐烂的产量损失和硬度对处理EC呈线性响应。通常，ECdaily的果实品质高于线性回归预测的果实品质，ECdaily的果实品质较低。尽管我们根据气候变量的变化对营养液EC进行短期动态变化的策略并没有增加产量，但是每天调整营养液EC可以改善外部水果的品质特征，并且可能对种植者采用是可行的。

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