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4 results on '"Cavers, Curtis"'

1. Comparison of conventional methods with Haney H3A version 4 for available phosphorus and potassium in southern Manitoba soils.

Author

Crittenden, Stephen, Molina, Oscar, Sager, Steve, Cavers, Curtis, Xing, Zisheng, St. Luce, Mervin, and Lawley, Yvonne

Subjects
AMMONIUM acetate, SOIL testing, PLANT nutrients, SOIL sampling, SOILS
Abstract

The H3A-4 extraction is a new method to determine plant available nutrients but has not been compared with standard soil tests or calibrated to crop response in Manitoba, Canada. Olsen P and ammonium acetate K were related to H3A-4 P and K for 961 soil samples. Significant relations were found between Olsen P and H3A-4 (R2 = 0.74, P < 0.01) and ammonium acetate K and H3A-4 (R2 = 0.83, P < 0.01). New thresholds were established for fertilizer recommendations with H3A-4 as 24 mg kg–1 for P and 32 mg kg–1 for K. [ABSTRACT FROM AUTHOR]

Published
2024
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2. The effect of four tillage systems on agronomic properties and soil health indicators in southern Manitoba.

Author

Crittenden, Stephen, Cavers, Curtis, and Xing, Zisheng

Subjects
SOIL ripping, SOIL management, SOILS, SOYBEAN, RAPESEED, TILLAGE, NO-tillage
Abstract

Soil health encompasses the collective functioning of chemical, physical, and biological properties in soil. The extent to which soil management affects soil health and the links with agronomic outcomes remain unclear. This project aimed to understand the interrelations of tillage systems, soil health, and agronomic properties in Portage la Prairie, MB, Canada. Tillage systems were cultivation, deep tillage, raised beds, and vertical tillage. Soybean (Glycine max (L.) Merr), corn (Zea mays L.), and canola (Brassica napus L.) were all grown in 2020, 2021, and 2022. Crop yield, seed protein content, and seed oil content were measured each year. Soil samples were taken in spring 2021, fall 2021, and fall 2022 and analyzed for nitrate-N, ammonium-N, total N, ACE protein, water extractable organic N, water extractable total N, water extractable ammonium N, soil organic matter, soil organic carbon, calcium carbonate equivalent, CO2 burst, permanganate oxidizable carbon, water extractable organic C, pH, salts, Olsen P, K, S, sand, silt, and clay. Tillage system had a significant impact on agronomic properties in seven crop by sampling combinations. Tillage system effected soil nitrate-N concentration at five crop by sampling combinations, three more than any other soil property. Soybean agronomic properties correlated with soil health indicators more frequently than for corn and canola. This suggests that the utility of soil health indicators may be crop specific. Further research is needed to understand the mechanisms underpinning the ability of soil health indicators to predict agronomic outcomes and to benchmark soil health indicator values with time. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Crop responses to topsoil replacement within eroded landscapes.

Author

Schneider, Sharon K., Cavers, Curtis G., Duke, Sara E., Schumacher, Joseph A., Schumacher, Thomas E., and Lobb, David A.

Abstract

Approaches to restore productivity to eroded soils are urgently needed to sustain food security. We evaluated plant response to soil‐landscape rehabilitation, in which approximately 15 cm of topsoil was moved from depositional landscape positions to the eroded upper slope. Crop response was monitored for 6 yr of a corn (Zea mays L.)–soybean [Glycine max (L.) Merr.] rotation at a severely eroded site and for 4 yr of a wheat (Triticum aestivum L.)–soybean rotation at a moderately eroded site. Experiments were conducted in years with relatively wet springs and droughty summers. In the severely eroded landscape, addition of 15 cm of soil increased crop biomass by 25–95% on a kg ha–1 basis and increased grain yields by 20–49% (corn) and 12–59% (soybean), with the largest yield increases recorded in the most eroded landscape positions. Soil addition increased corn grain protein and test weight. No significant differences were observed in crop emergence rate or stand establishment. In the moderately eroded landscape, soil addition significantly increased crop biomass, but not grain yield. In both landscapes, yields were lower in areas of soil removal than in adjacent areas from which no soil was removed, which is likely at least partially an artifact of the plot design. While more research is needed to evaluate long‐term impacts, the results of these studies show that soil‐landscape rehabilitation may help alleviate the effects of past erosion and provide immediate benefits to the productivity of severely eroded soils. Core Ideas: Replacing translocated topsoil can restore productivity to severely eroded land. Adding 15 cm of topsoil increased corn and soybean grain yields by 12–59%. Adding topsoil increased crop biomass but not emergence rates or stand establishment. Adding topsoil did not significantly increase grain yield on moderately eroded land. Areas of soil removal had lower crop yields, partially due to excessive moisture. [ABSTRACT FROM AUTHOR]

Published
2021
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