Based on the discharge characteristics test for a porous pipe used widely in greenhouse sub-irrigation in west Liaoning Province, China, Time Domain Reflectometry (TDR) was applied to monitor the process of soil water movement during sub-irrigation. A model to determine the soil wetting shape was developed using a dimensional analysis method. Statistical analysis revealed that this model has a high accuracy in simulating the wetted soil shape, demonstrating that there was no significant difference between predicted and observed soil wetted width under different depths. It showed that one simple model could also be used to simulate the shape of the wetting area under a porous pipe sub-irrigation system, which was expected to provide aids for deciding depth and intervals of pipes and designing a sub-irrigation scheme. Copyright # 2007 John Wiley & Sons, Ltd. RÉ SUMÉA partir des tests de débit caractéristique d'un tuyau poreux largement utilisé en irrigation souterraine sous serre dans l'ouest de la Province de Liaoning, une Réflectométrie dans le Domaine Temporel (TDR) a été utilisée pour surveiller le processus du mouvement de l'eau dans le sol pendant l'irrigation. Un modèle pour déterminer la forme de mouillage du sol a été développé en utilisant une méthode d'analyse dimensionnelle. L'analyse statistique a révélé que ce modèle est d'une très grande précision dans la simulation de la forme mouillée du sol, car il n'y avait aucune différence significative entre la prévision et l'observation de largeur de sol mouillé à différentes profondeurs. Elle a montré qu'un modèle simple pouvait aussi être utilisé pour simuler la forme de la zone humide en irrigation souterraine à canalisations poreuses, ce qui permet une aide à la décision concernant la profondeur et les intervalles entre tuyaux lors de la conception d'un système d'irrigation souterraine.
Under water culture, this paper researched into the effect of copper stress on photosynthesis and nutrient absorption of grafted (Cucumis sativus L. "Xintaimici" / Cucurbita ficifolia) and ungrated cucumber. Under 6 days of copper stress, there is significant depression in the contents of chlorophyll, carotenoid, nutrient(N, K, Ca, and Mg), and in net photosynthetic rate and stomatal conductance in both grafted and ungrafted cucumber seedling leaves. An obvious increase in electrolyte leakage is also observed.Though intercellular CO 2 concentration depresses with increase in Cu concentration, there exists no significant correlation among the treatments. The contents of chlorophyll, carotenoid and nutrient (N, K, Ca, and Mg) and the net photosynthetic rate of grafted cucumber seedling leaves are significantly higher than those in ungrafted cucumber plants. On the other hand, percent electrolyte leakage is significantly lower in grafted than that in ungrafted cucumber plants. Copper content in grafted cucumber seedling leaves is significantly lower than that in ungrafted seedling leaves. This implies that grafted cucumber plants have the strong capacity for inhibiting Cu 2+ accumulation in leaves which alleviates copper poison.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.