Soil pH, soil acidity, and their effects on plants The pH scale, ranging from 0 to 14, is used to indicate acidity and alkalinity. pH is a measure of the concentration of hydrogen ions (symbol = H) in the water contained in the soil. A pH of 7.0 is neutral, values below 7 are acidic, and those above 7 are alkaline (basic). The lower the pH, the more acid the soil. Each unit pH drop indicates te...

山麦冬属( Li r io p e Lour .)植物系百合科植物 , 中国分布有 8 种(变种) 1 ] ,分别为山麦冬( Li r io p e s p ica ta Lour .) 、湖 北 山 麦 冬 ( Li r io pe sp icata Lour . var . prol i f e ra Y . T . Ma) 、短葶山麦冬 [ Li r io p e musacar li (Decne .) Bailey] 、阔叶山麦冬 ( Li r io p e p lat y phy l la Wang et Tang) 、甘肃山麦冬 [ Li r io p e kansuensi s (Batal .) C . H . Wright] 、禾 叶山麦冬[ Li r io pe g ram ini f olia (L .) Baker]和矮 小山麦冬[ Li r io p e ...

The ‘Crimson seedless’ grape encountered several difficulties during shelf life, including weight loss, rachis browning, and berry shattering. effect of exogenous pectin (PE) polyphenol alcohol (PVA) with supporting salicylic acid (SA) at different concentrations (0, 1, 2 mM) was applied. coating applied to bunches for 5 min stored room temperature (26 ± 1 °C RH 65 3%) 4 days. In this study, po...

Soil acidity can affect plant growth directly and indirectly by affecting the plantavailability of nutrients, levels of phytotoxic elements, and microbial activity. Soils may become acidic in the long term as a result of several natural processes. In the short term, however, soil acidity develops mainly due to application of N fertilizers or manure, primarily those having high concentrations of...

Experiments were conducted in 2013 and 2014 to evaluate the effects of training system leaf removal treatments on yield quality for ‘Frontenac’, an interspecific hybrid wine grape, at a research vineyard located near Absaraka, North Dakota. The experiment was structured as randomized complete block design with split-plot arrangement including four (Geneva Double Curtain (GDC), High Cordon (HC),...

The influence of acidity on the growth of plants in water-culture has been studied by investigators with varying results. Many have reported a beneficial effect of moderate acidity; whereas others have succeeded in demonstrating equally good growth in solutions of widely different hydrogen-ion concentration. Citations to the literature can be found in a paper by the writer (5) dealing with the ...

Recent evidences suggest that the acidic microenvironment might facilitate epithelial mesenchymal transition (EMT) of tumor cells, while the effects of acidity on EMT of pancreatic cancer (PC) remain undefined. The present study demonstrated that acidity suppressed miR-652 expression, which further promoted EMT process by absenting inhibition on the transcriptional factor ZEB1 expression. At fi...

Hollander's insulin test was evaluated by performing successively partial denervation of the parietal cell area, highly selective, selective, and truncal vagotomy operations on three dogs. The rise in acidity, the timing of the highest rise in acidity, and the rise in acid output were examined. The mean rise in acidity (m-equiv/l) before vagotomy (106 +/- SE11, 120 +/- 23, 60 +/- 16) did not di...

Topographic Effects on Stormflow Acidity David Wolock 1 This paper describes the theoretical and observed effects of topography onstormflow acidity in upland, forested watersheds. The theoretical effects were determined by a sensitivity analysis using the hydrologic model TOPMODEL. The observed effects were determined by an analysis of topographic and stormflow acidity data collected from eight...

The acidity constants of 4-(2-pyridylazo)resorcinol (PAR, Scheme 1) in binary mixtures of methanol–water at 25 ◦C and an ionic strength of 0.1 M have been determined spectrophotometrically. DATa ANalysis (DATAN) program applied for determination of acidity constants. As percent of methanol increases in solvent mixtures the pKa constants also increased. There is linear relationship between acidi...