Výsledky vyhledávání - "J. W. Ketcheson"

EFFECTS OF SOIL EROSION ON YIELD OF CORN

Publikováno v: Canadian Journal of Soil Science. 58:459-463

Historically, special or intensive soil conservation methods have been recommended to control soil and water losses and maintain crop yields. However, farmers have not adopted these recommendations due to the high-energy input and the resulting reduc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1550c395f4b39628686bf69f7550bba6
https://doi.org/10.4141/cjss78-052

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SOURCES OF POTASSIUM IN POTATO FERTILIZER AND TIMES OF APPLICATION

Autor: J. W. Ketcheson, R. G. Rowberry

Publikováno v: Canadian Journal of Plant Science. 58:779-782

Potatoes (Solanum tuberosum L. ’Kennebec’) receiving similar N, P and K nutrition showed no consistent changes in yield, specific gravity and quality of boiled tubers when K2SO4 and KNO3 were substituted for the commonly-used KCl. Broadcasting th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c40fbe2968e9790345e60b8012f49ae2
https://doi.org/10.4141/cjps78-115

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LONG-RANGE EFFECTS OF INTENSIVE CULTIVATION AND MONOCULTURE ON THE QUALITY OF SOUTHERN ONTARIO SOILS

Autor: J. W. Ketcheson

Publikováno v: Canadian Journal of Soil Science. 60:403-410

Ontario holds a significant proportion of the land base for Canada’s food production. Many of the soils are vulnerable to the effects of erosion and intense cropping. Laboratory and field studies indicate that monoculture systems without grass-legu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0e1b974a3f031ff28a2bfa7de198ea87
https://doi.org/10.4141/cjss80-045

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THE EFFECT OF NITROGEN FORM AND SOIL TEMPERATURE ON THE GROWTH AND PHOSPHORUS UPTAKE OF CORN PLANTS GROWN IN THE GREENHOUSE

Autor: J. F. Dormaar, J. W. Ketcheson

Publikováno v: Canadian Journal of Soil Science. 40:177-184

In a greenhouse experiment, corn seedlings were grown over a 2-week period in soil and in sand-resin media. Nitrate and ammonium nitrogen was applied at rates from 25 to 800 p.p.m., and phosphorus at 50 and 200 p.p.m. Soil temperatures of 60°, 70°,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0909fccc823e17193c6fd8bf2e8d58cb
https://doi.org/10.4141/cjss60-023

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INFLUENCE OF SOIL WATER MATRIC POTENTIAL AND RESISTANCE TO PENETRATION ON CORN ROOT ELONGATION

Autor: J. W. Ketcheson, H. F. Mirreh

Publikováno v: Canadian Journal of Soil Science. 53:383-388

A study of the interacting effects of soil bulk density and soil water matric potential on resistance to penetration and on corn root elongation showed that for any level of resistance, elongation was further restricted as potential decreased (suctio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5234ba3b0e37eafad9fdee4b237269f3
https://doi.org/10.4141/cjss73-055

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Effect of Controlled Air and Soil Temperature and Starter Fertilizer on Growth and Nutrient Composition of Corn (Zea mays L.)

Autor: J. W. Ketcheson

Publikováno v: Soil Science Society of America Journal. 32:531-534

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bd015866c540bfbe1d23448e79946dd1
https://doi.org/10.2136/sssaj1968.03615995003200040032x

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THE EFFECT OF PLACEMENT OF BANDED FERTILIZER ON FERTILIZER PHOSPHORUS ABSORPTION AND YIELD OF OATS IN GREENHOUSE AND FIELD EXPERIMENTS

Autor: C. G. Sherrell, J. W. Ketcheson, M. H. Miller

Publikováno v: Canadian Journal of Soil Science. 44:329-336

The effect of various placements of different rates of phosphorus fertilizer on fertilizer phosphorus absorption patterns and yield of oats m the field corresponded with those in the greenhouse. While fertilizer phosphorus absorption was greater from

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3c990843f42e640fc423ffaa16ae747e
https://doi.org/10.4141/cjss64-048

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INFLUENCE OF SOIL BULK DENSITY AND MATRIC PRESSURE ON SOIL RESISTANCE TO PENETRATION

Autor: J. W. Ketcheson, H. F. Mirreh

Publikováno v: Canadian Journal of Soil Science. 52:477-483

Cylinders of a clay loam soil were adjusted to different bulk density and matric pressure combinations to study soil resistance to a penetrating probe. Regression analysis of the penetrometer data produced no evidence to reject a regression model of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e4a0d0a8671c322a7a07080d2d86360b
https://doi.org/10.4141/cjss72-059

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