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Characterization and modelling of water and mineral uptake in soiless cucumber: Fertigation management application.

机译：土壤黄瓜中水分和矿物质吸收的表征和建模：施肥管理应用。

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Fertigation management of hydroponics crops in commercial greenhouse is presently based on totally empirical rules for adjustment and control of the nutrient solution. This management generally results in an excess of applied water and fertilizers, with the consequent negative impact on the environment. Improving fertigation management, making a better use of available knowledge and models of water and mineral elements uptake, represents a priority issue for scientists.; Within this context, the main scientific goal of the present study was the characterization and analysis of the relations and interactions between the dry biomass accumulation of a cucumber greenhouse crop, its water consumption and its uptake of mineral nutrients. The applied objective is to formulate and validate from the collected experimental data the corresponding operational models of the processes that allow to describe and predict realistically the mineral uptake.; For reaching these objectives, an experimental protocol was first elaborated in order to characterize, during two crop cycles (winter and spring) and under a climatized glasshouse, the dynamics of dry matter accumulation, leaf area expansion, water consumption and mineral uptake. The interpretation of the experimental data by means of (i) growth analysis and (ii) the use of concepts such as radiation use efficiency and intercepted radiation, allowed to determine the general trends of the processes.; The second part of the study consisted in the elaboration and validation of different simplified models for estimating dry biomass production, leaf area index and transpiration. These models were use afterwards for deriving the mineral absorption, using empirical relationships established between these variables and the mineral uptake of a given element (N, P, K, Ca, Mg). The final choice of the models was based on the validation of the different modelling schemes, one in open circuit and the other with a closed system.; A useful data set of data is now available about the dynamics of mineral uptake by a cucumber crop at medium term (week), and its links with other processes such as biomass accumulation and water consumption. The data allowed to elaborate and validate operational models for predicting mineral uptake at a weekly interval, and their future use as tools for controlling and adjusting the nutrient solution in both open and closed systems.
机译：目前，商业温室水培作物的施肥管理是基于完全经验法则来调节和控制营养液的。这种管理通常导致过量施用水和肥料，从而对环境造成负面影响。改进施肥管理，更好地利用水和矿质元素吸收的现有知识和模型，是科学家的优先任务。在此背景下，本研究的主要科学目标是表征和分析黄瓜温室作物的干生物量积累，其耗水量和对矿质养分的吸收之间的关系和相互作用。应用的目的是从收集的实验数据中制定和验证相应的过程操作模型，以描述和实际地预测矿物质的吸收。为了达到这些目标，首先制定了一个实验方案，以表征在两个作物周期（冬季和春季）以及在气候温室下的干物质积累，叶面积扩大，耗水量和矿物质吸收的动态。通过（i）生长分析和（ii）使用辐射利用效率和截获辐射等概念来解释实验数据，从而可以确定过程的总体趋势。研究的第二部分包括详细说明和验证不同的简化模型，以估算干生物量的产量，叶面积指数和蒸腾作用。之后，利用这些模型与给定元素（N，P，K，Ca，Mg）的矿物质吸收之间建立的经验关系，将这些模型用于导出矿物质吸收。模型的最终选择是基于对不同建模方案的验证，一种是开路的，另一种是封闭的。现在可获得关于黄瓜作物在中期（周）的矿物质吸收动态及其与其他过程（如生物量积累和水消耗）的联系的有用数据集。这些数据可以详细阐述和验证每周预测矿物质摄入量的操作模型，并将其用作在开放式和封闭式系统中控制和调节营养液的工具。

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  • 作者

    Gomez Lopez, Maria Dolores.;

  • 作者单位

    Universidad Politecnica de Cartagena (Spain).;

  • 授予单位 Universidad Politecnica de Cartagena (Spain).;
  • 学科 Agriculture Plant Culture.; Engineering Agricultural.
  • 学位 Dr.
  • 年度 2004
  • 页码 269 p.
  • 总页数 269
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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