Estimating cucumber crop coefficients under different greenhouse microclimatic conditions

IF 3 3区地球科学 Q2 BIOPHYSICS

International Journal of Biometeorology Pub Date : 2023-09-21 DOI:10.1007/s00484-023-02535-y

Georgios Nikolaou, Damianos Neocleous, Evangelini Kitta, Nikolaos Katsoulas

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Abstract

This study aimed to determine cucumber crop coefficients under different greenhouse microclimatic conditions, parameterizing the Priestley-Taylor reference evapotranspiration model. Crop evapotranspiration was directly measured with the use of lysimeters, and crop coefficients were computed following the two-step climate FAO 56 methodology. Greenhouse compartments (i.e., cooled or uncooled) showed reference evapotranspiration differences of up to 12% in an autumn-winter crop. The results presented cucumber crop coefficient values from the initial to the late-season growth stages from 0.45 to 0.94 depending on the greenhouse climate. Based on the greenhouse hourly microclimatic variation of K_C, it is recommended not to apply a K_C as a constant for transpiration estimation even at greenhouses located within the same region Regression analysis relating crop coefficients with leaf area revealed very high correlation coefficients for the equations tested. The results indicated that evapotranspiration can be modeled satisfactory based on a significant relationship between crop coefficient and simple measurements of the leaf area index (i.e., K_C = 0.447 × LAI).

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估算不同温室小气候条件下的黄瓜作物系数。

本研究旨在确定不同温室小气候条件下的黄瓜作物系数，将Priestley-Taylor参考蒸散模型参数化。使用蒸渗计直接测量作物蒸散量，并按照两步气候FAO 56方法计算作物系数。温室隔间（即冷却或未冷却）显示，秋冬作物的参考蒸散差异高达12%。结果表明，黄瓜从生长初期到生长后期的系数值为0.45至0.94，具体取决于温室气候。基于温室每小时KC的小气候变化，建议即使在位于同一区域内的温室中，也不要将KC作为蒸腾估算的常数。将作物系数与叶面积相关的回归分析显示，测试方程的相关系数非常高。结果表明，基于作物系数和叶面积指数的简单测量之间的显著关系（即KC=0.447×LAI），可以令人满意地模拟蒸散。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Biometeorology 地学-环境科学

CiteScore

6.40

自引率

9.40%

发文量

183

审稿时长

1 months

期刊介绍： The Journal publishes original research papers, review articles and short communications on studies examining the interactions between living organisms and factors of the natural and artificial atmospheric environment. Living organisms extend from single cell organisms, to plants and animals, including humans. The atmospheric environment includes climate and weather, electromagnetic radiation, and chemical and biological pollutants. The journal embraces basic and applied research and practical aspects such as living conditions, agriculture, forestry, and health. The journal is published for the International Society of Biometeorology, and most membership categories include a subscription to the Journal.