Effects of soil ph, nitrogen source, phosphorus, and molybdenum on early growth and mineral nutrition of burley tobacco

Abstract

Previous research has indicated that P application may influence plant Mo nutrition, and that both P and Mo are influenced by soil pH. This is of interest, since Mo is deficient in some soils and because large quantities of acidifying nitrogenous fertilizers are commonly applied in production of burley tobacco (Nicotiana tabacum L.).Burley tobacco was grown in two experiments using Maury silt loam soil (Typic Paleudalfs) to determine the influence of soil acidity, form of N applied, and P application on plant growth and mineral nutrition. The studies were conducted in the greenhouse so that high root densities would develop and the data primarily reflect rhizosphere effects.Ammonium application depressed rhizosphere pH 0.4 to 0.6 pH units. Nitrate nutrition raised soil pH less than 0.1 pH unit. Plants supplied NH4 exhibited slower early growth than plants supplied NO 3 . Several significant interactions involving soil pH, N source, P, and Mo occurred. In the first experiment, plant P was not affected by form of N applied, while in the second experiment NH 4 application resulted in higher plant P concentration, both in presence and absence of applied P. Application of NH4 also increased plant weight in the second experiment. Plant P concentration was influenced by pH, being greatest at pH 6.2 and decreasing as pH levels decreased or increased. Plant Mo concentration did not differ among forms of N at pH 5.4, but at pH 7.2 was three times greater in the presence of NO 3 . When Mo was applied, P addition enhanced plant Mo concentration, but when Mo was not applied, P addition did not increase Mo concentration. This effect of P on Mo occurred only in the presence of N and was greater 641

Grafting alleviates potassium stress and improves growth in tobacco

“…The potassium content of the leaves, as the economic organ of tobacco, greatly affects its commercial value [3, 30, 31]. Grafting can affect the utilization efficiency of multiple nutrients in tobacco [32–34].…”

“…Potassium content is recognized as an important indicator of quality by the cigarette industry. Tobacco plants growing in conditions that allow the plants to accumulate a sufficiently high concentration of potassium give a product with a better flammability, aromatic taste, and processability of tobacco leaves [3]. However, due to complex soil environments and climatic conditions, potassium deficiency is a common problem in China’s major tobacco growing regions, and the potassium concentration in tobacco leaves in these areas is generally lower than the global standard for high quality tobacco [4].…”

Effect of molybdenum, phosphorus, and lime application to acid soils on dry matter yield and molybdenum nutrition of lentil

“…Basak et al (1982) observed a significant increase in the concentration of Mo in rice {Oryza sativa L.) shoot due to P application in soil. However, Schwamberger and Sims (1991) reported that P application in soils could increase Mo concentration in plant tissues only when it was combined with Mo application. In spite of having increased dry matter yield due to P and lime application, in the present experiment there was an increase in the Mo concentration in plants, indicating that Mo absorption by plants from soils more than offset the dilution effect.…”

Evaluation of Some Synthetic Soil Conditioners and Nitrogen Rates on Nitrogen Use Efficiency by Maize - Wheat Crops System in Calcareous Soil

“…Regarding the application of N fertilizer rates, obtained results showed that increasing nitrogen rates was favorable for NPK total content for straw and grains of maize and wheat plants. This increase of nutrients total content with nitrogen rate may be attributed to nitrogen sources induced acidity on the availability of native element especially in root zone which increases most of the studied elements for plant as described by Schwamberger and Sims (1991).…”