Soil Acidity Determination Methods for Organic Soils and Peat Materials

The optimal soil pH and sufficiency concentrations of N in plants and P, K and Ca + Mg in plants and soils were determined for alfalfa (Medicago sativa L.) and onion (Allium cepa L.) grown on three acid organic soils in a growth chamber experiment. The heaviest (14 t/ha) liming rate reduced soil acidity from pH 3.4 to 5.1 (1 N KCl), pH 3.9–6.2, and pH 2.6–4.9 on soils 1, 2 and 3, respectively. Liming increased alfalfa yields on all soils, but onion yields on only two soils out of three. Yields were, however, not increased by liming soils above pH 4.5 for alfalfa and 4.0 for onion. At maximum yields, the concentration of Ca + Mg in alfalfa at pH 4.5 was about 145 meq/100 g tissue while the concentration in onion at pH 4.0 was about 86 meq, concentrations that are typical for these crops grown successfully on other soils. Alfalfa and onion yields were not increased by fertilizing these soils at higher levels than 200 kg N, 100 kg P and 400 kg K/ha. The average sufficiency concentrations of plant nutrients for obtaining maximum yields were: tissue, 2.0 and 2.1% N, 0.2 and 0.24% P, 1.2 and 1.9% K; soil, 90 and 100 ppm P (13 and 15 μg P/cm3), and 0.8 and 0.9 meq K/100 g (44 and 50 μg K/cm3) for alfalfa and onion, respectively.

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INFLUENCE OF SOIL MOISTURE, SOIL pH, AND LIMING SOURCES ON THE INCIDENCE OF CLUBROOT, THE GERMINATION AND GROWTH OF CABBAGE PRODUCED IN MINERAL AND ORGANIC SOILS UNDER CONTROLLED CONDITIONS

Canadian Journal of Plant Science ◽

10.4141/cjps78-010 ◽

1978 ◽

Vol 58 (1) ◽

pp. 45-53 ◽

Cited By ~ 17

Author(s):

HERMAN A. HAMILTON ◽

RENÉ CRÊTE

Keyword(s):

Soil Moisture ◽

Soil Ph ◽

Soil Acidity ◽

Plasmodiophora Brassicae ◽

Mineral Soil ◽

Organic Soil ◽

Inhibitory Effect ◽

Organic Soils ◽

Plant Nutrient ◽

Germination And Growth

Under growth chamber conditions, the influence of soil moisture, soil pH, and liming sources on the germination, yield and infection of cabbage by Plasmodiophora brassicae Wor. was studied in artificially infested mineral and organic soils. Clubroot infection occurred at moisture levels as low as 9 and 60% in the mineral and organic soils, respectively. The growth of cabbage and the reduction of the incidence of clubroot were more dependent on liming source than on soil pH. Soil pH adjustment to effect complete clubroot control was invariably deleterious to cabbage growth. It was established for the organic soil that the effect of calcium hydroxide was important in correcting soil acidity as well as supplying calcium as an essential plant nutrient for cabbage. In addition, there was evidence that correction of the soil acidity favored clubroot development, but simultaneously the Ca ion had an inhibitory effect on the disease organism. On the mineral soil, Mg sources producing a soil pH not normally considered deleterious to plants affected the germination and ultimate yield of cabbage.

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Ultrastructure of the soil fungus, Geomyces pannorus

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100113573 ◽

1984 ◽

Vol 42 ◽

pp. 738-739

Author(s):

J. A. Traquair ◽

E. G. Kokko

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Fine Structure ◽

Low Temperatures ◽

Soil Fungus ◽

Organic Soils ◽

Anatomical Studies ◽

Transmission Electron ◽

Electron Microscopical ◽

Scanning Electron

With the advent of improved dehydration techniques, scanning electron microscopy has become routine in anatomical studies of fungi. Fine structure of hyphae and spore surfaces has been illustrated for many hyphomycetes, and yet, the ultrastructure of the ubiquitous soil fungus, Geomyces pannorus (Link) Sigler & Carmichael has been neglected. This presentation shows that scanning and transmission electron microscopical data must be correlated in resolving septal structure and conidial release in G. pannorus.Although it is reported to be cellulolytic but not keratinolytic, G. pannorus is found on human skin, animals, birds, mushrooms, dung, roots, and frozen meat in addition to various organic soils. In fact, it readily adapts to growth at low temperatures.

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The yield of perennial grass stands on drained organic soils of Steppe

Interdepartmental thematic scientific collection "Agriculture" ◽

10.31073/zem.90.92-97 ◽

2016 ◽

Vol 1 (90) ◽

pp. 92-97

Author(s):

I.T. Slusar ◽

V.A. Serbenyuk ◽

A.N. Gera ◽

A.P. Solyanik ◽

A.A. Tarasenko

Keyword(s):

Zinc Sulphate ◽

Foliar Application ◽

Perennial Grass ◽

Mineral Fertilizer ◽

Dry Weight ◽

Research Area ◽

Organic Soils ◽

Growth Promoters ◽

Cobalt Sulfate ◽

The Impact

Research on the impact of the introduction of micro fertilizers and growth promoters on a background of mineral fertilizer and without N90R45К120 spent on old peat in shallow carbonate floodplain r.Supiy, Yahotyn Kyiv region. Power peat horizon about 60-70 cm, 7,4-7,6 pH of the aqueous extract, stupas schedule 56-60%, density 0,49-0,52 assembly soil, total nitrogen content (%) - 1.9; gross forms of phosphorus - 0,4, potassium 0.2, 20% lime. In experiments studying biological rehoplant, radustym, Biolan, emistim, Jets, humisol, plantafol, radyfarm and micronutrients: copper, boric acid, manganese sulphate, zinc sulphate, potassium humates. Treatment drugs conducted in the spring by spraying mixtures. Space research area of 60 m2, three-time repetition. It is established that the use of growth stimulants and micronutrients in the background N90R45К120 provided the highest yield mixtures of years, against making BIOLan - 9.9 t / ha Radyfarmu - 9.6 t / ha Radostymu 9.3 t / ha dry weight. In areas for making other preparations were intermediate yield growth rates - 0.5 - 2.0 t / ha dry weight. Also good gains herbage yields obtained by making all kinds of micronutrients and growth stimulants in the background without making makrodobryv which was within 5.3 - 6.9 t / ha to control without fertilization - 4.5 t / ha dry weight. In deep peat copper fertilizer (25 kg / ha of copper sulphate or 5 kg / ha pirytnoho cinders) in all zones should be making every 3-4 years, and zinc, cobalt and molybdenum advisable to make time for the growing season, spring, by foliar application in such numbers: ammonium molibdenovokyslyy - 0.3 kg / ha; cobalt sulfate - 3 kg / ha zinc sulphate 0.5 kg / ha or placers these salts should be mixed with major fertilizer.

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