Model Simulation of Cucumber Yield and Microclimate Analysis in a Semi-closed Greenhouse in China

Abstract

<jats:p>Adequate greenhouse environmental management is very important for improving resource use efficiency and increasing vegetable yield. The objective of this study was to explore suitable climate and cultivation management for cucumber to achieve high yield and build optimal yield models in semi-closed greenhouses. A fruit cucumber cultivar Deltastar was grown over 4 years in greenhouse and weekly data of yields (mean, highest and lowest) and environmental variables, including total radiation, air temperature, relative humidity, and carbon dioxide (CO<jats:sub>2</jats:sub>) concentration were collected. Regression analyses were applied to develop the relationships and build best regression models of yields with environmental variables using the first 2 years of data. Data collected in years 3 and 4 were used for model validation. Results showed that total radiation, nutrient, temperature, CO<jats:sub>2</jats:sub> concentration, and average nighttime relative humidity had significant correlations with cucumber yields. The best regression models fit the mean, lowest, and highest yields very well with <jats:italic>R</jats:italic><jats:sup>2</jats:sup> values of 0.67, 0.66, and 0.64, respectively. Total radiation and air temperature had the most significant contributions to the variations of the yields. Our results of this study provide useful information for improving greenhouse climate management and yield forecast in semi-closed greenhouses.</jats:p>

Blocking and re-arrangement of pots in greenhouse experiments: which approach is more effective?

“…Assuming that temperature and radiation are the most important variables for heterogeneous microclimates within the green-house, [26] showed that optimized re-arrangement of pots can reduce accumulated positional effects by 90%. Second, for a fixed-position arrangement, this information can be used as a covariate [7, 36].…”

Identification of Sources of Multiple Disease Resistance in Advanced Breeding Lines of Bottle Gourd (Lagenaria siceraria (Molina) Standle)

“…Multiple regression models have been successfully utilized in the prediction of yield losses caused by multiple diseases and climatic conditions in crops like wheat (Jevtic et al, 2017;Ficke et al, 2018;Jevtic et al2020), French bean (Kumar and Kudada, 2018), cucumber (Ding et al, 2019), bitter gourd (Prasanth et al, 2019), potato (Yellareddygari et al, 2018) to name a few. Multiple linear regression using yield as dependent variable and GSB and powdery mildew intensities as independent variables was conducted.…”

Optimal Utilization of Light Energy in Semiclosed Greenhouse Using Three-Dimensional Cucumber Model

“…e detailed information of the experimental greenhouse can be referenced in Ding et al [2]. Mini-cucumbers (Cucumis Sativus L. cv.…”

“…With the promotion and application of semiclosed greenhouses in China, the excess solar energy in summer was collected and stored, and this energy should be reused to heat the greenhouse in winter [1]. As a result, the impact of low temperature in winter on yield has been greatly improved [2]. Nevertheless, in greenhouses without supplementary light, low light intensity remains an important cause affecting winter production [1].…”