As the biggest developing country with the largest population in the world, China has made great achievements in education development, which has contributed tremendously to reducing poverty and boosting prosperity in the past decades. However, in the course of education development, many problems and issues have emerged, which have also been extensively studied by scholars in various fields in both China and international contexts. Among the myriad of research topics, three research foci stand out as the most concerning and studied: education return, education quality, and education equity. This paper draws on both international research literature and evidence from China to discuss education development issues including education return, education quality, and education equity, and suggests future directions for research and practice to enhance education development and to achieve a sustainable future.

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Unreacted residual limestone in the container substrate is key in buffering pH change over time. Our goal was to develop a substrate test protocol to measure residual lime [in units of CaCO3 equivalent (CCE)] by applying a strong mineral acid (HCl) to a substrate sample and measuring the evolved CO2 gas with a gasometric method based on a Chittick apparatus. In one experiment, CaCO3 was added to a substrate that had previously been neutralized to pH 7.35 with Ca(OH)2 so that there would be minimal CaCO3 reaction with the substrate at this high pH. The gasometric method was then used to estimate residual CCE. Measured CCE and applied CaCO3 were similar, indicating reliable CCE estimation. In a second experiment, a pH titration method was used to quantify the relationship between substrate-pH and milliequivalents of reacted base and provided an additional validation of the estimated reacted and residual CCE. The gasometric method demonstrated declining residual CCE over time as a dolomitic limestone reacted to raise substrate-pH and increasing residual CCE as applied CaCO3 concentration increased. Residual CCE in a substrate is an important property that should be considered for pH control and management in greenhouse crop production. Our results indicate that the gasometric system may be useful for optimizing lime application rate, lime source, or management of residual CCE during crop production.