Results 231 to 240 of about 7,723,907 (283)

Estimating Plant-Available Potassium in Potassium-Fixing Soils

Communications in Soil Science and Plant Analysis, 2013
Soil tests commonly used to develop potassium (K) fertilizer recommendations, such as extraction by 1 M ammonium acetate (NH4OAc) at pH 7, measure both soluble and exchangeable K. In soils that fix K so that it is no longer exchangeable, although a portion of it may still be available to plants, additional tests are required to understand the dynamics ...
Gordon L. Rees, G. Stuart Pettygrove, Randal J. Southard   +2 more
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AVAILABLE SOIL POTASSIUM AND FERTILIZER POTASSIUM FOR BRUSSELS SPROUTS

Canadian Journal of Plant Science, 1971
Brussels sprouts (Brassica oleracea var. gemmifera DC., Jade Cross) require no potassium fertilizer on Prince Edward Island soils if exchangeable soil K as determined by neutral 1 N ammonium acetate exceeds 100 ppm. Below 75 ppm exchangeable soil K, 186 kg K/ha must be applied for maximum yields.
D. C. MUNRO, J. A. CUTCLIFFE
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Available potassium in volcanic soils of Kamchatka

Eurasian Soil Science, 2009
The distribution of available potassium in the profiles of synlithogenic volcanic soils of Kamchatka has been studied. Most of the soils in the Central Kamchatka Depression and the Western Kamchatka Lowland are characterized by a medium content of nonexchangeable potassium and a high content of exchangeable potassium.
E. A. Zharikova, O. M. Golodnaya
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Relation of Available Potassium to Soil Moisture

Soil Science Society of America Journal, 1956
Abstract Preliminary studies revealed that exchangeable K levels in Iowa soils fluctuated in response to vapor pressure changes and air drying. This phenomenon was investigated in relation to (1) K nutrition of plants in the greenhouse and (2) the problem of predicting the relative K‐fertility status in a wide range of Iowa soils. The
R. E. Luebs, G. Stanford, A. D. Scott
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The availability of the potassium in some scottish soils

The Journal of Agricultural Science, 1929
(1) The solubility of the potash in 34 soil samples from 13 soils typical of large areas in the East of Scotland has been determined by the methods of chemical analysis using (a) hot concentrated hydrochloric acid, and (b) 1 per cent, citric acid solution, and the values obtained compared with the quantities of potash existing in the exchangeable form.
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Assessing the availability of potassium in soils

Australian Journal of Experimental Agriculture and Animal Husbandry, 1981
Two forms of depletion cropping were examined. Perennial ryegrass was continuously cropped on two contrasting soils in pots. Simultaneously, repeated crops of ryegrass, subterranean clover, and marrow-stem kale were grown by a modified system of depletion cropping in which the whole plant was harvested and the soil sampled before being repotted for ...
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‘A’ Values of Potassium Related to Other Indexes of Soil Potassium Availability

Soil Science Society of America Journal, 1967
Abstract A technique was developed to measure ‘A’ values of K with oat ( Avena sativa ) plants grown in the greenhouse and with the radioactive isotope 42 K.
W. F. Nuttall, B. P. Warkentin, A. L. Carter   +2 more
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Use of exchangeable potassium in assessing potassium availability in Tasmanian soils

Australian Journal of Experimental Agriculture, 1979
Three sequential surveys of exchangeable potassium (Exch. K) in the surface 10 cm of major Tasmanian soils are presented, together with data from surface samples of profiles collected earlier. Soils with Exch. K less than 0.4 m.equiv 100 g-1 are considered to be low or marginal in potassium readily available for pasture growth. Lateritic podzolic soils
AM Graley, KD Nicolls
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Soil Properties Affecting the Availability of Potassium in Highly Weathered Soils

Soil Science Society of America Journal, 1988
Abstract The interpretation of soil tests for K in highly weathered soils may be improved if the K buffering power is considered in addition to extractable K. This study was conducted to determine if cation exchange capacity (CEC) and humic matter (HM) should be included in the development of more meaningful K availability indices ...
E. Uribe, F. R. Cox
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Studies on the Available Potassium Status of Soil as Influenced by the Application of Nitrogen and Potassium

Madras Agricultural Journal, 1980
The results of a field experiment conducted to study the effect of N and K fertilizer in bhendi crop on available potassium status of soil are presented. The availabis K content of the soil was not influenced by the application of N but the application of K significan tly increased the K content of the soil.
MANI S, RAMANATHAN K.M
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