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Search results on 01/23/19
241. Allmaras, R.R., J.M. Kraft and J.L. Pikul, Jr.. 1987. Lime and gypsum effects on pea-root-pathogen inoculum and related factors in a wheat-peas rotation.. Agron. J., 79(3):439-445.
Root-disease responses to manageable soil chemical factors, such as pH or Ca saturation, can be an effective biological control strategy. In a wheat-pea rotation, a single application of lime, to ad just pH of a Walla Walla silt loam from 5.5 to 6.2, produced less growth in peas than in wheat - a response inconsistent with greater legume responses to liming. Reduced propagule numbers in the top 0.15m of soil may not have reduced root disease because propagules of F. solani f. sp. pisi were abundant in the 0.15-0.45m layer, which had a pH of 5.7 and showed only a negligible increase of Ca saturation. T: Soil pH responses several years after lime or gypsum application to a Walla Walla silt loam in a wheat-peas rotation. Summary of analysis of variance of propaguledensity, measured in the 0-0.15m depth. Time trends of propagule density in the 0 -0.15m layer of wheat-pea rotation on a Walla Walla silt loam as related to lime and gypsum treatments. etc.
7570. Wilkins, D.E. and J.M. Kraft. 1987. Crop residue management and pea root rot disease.. Am. Soc. Agric. Engrs., Paper No. 87-2510.
The objectives of this research were to determine the influence of placement of crop residue on the distribution and concentration of P. ultimum and F. solani f. sp pisi propagules and the associated impact of these root rot diseases on pea growth. Results suggest that conservation tillage which utilizes crop residue on and near the soil surface for erosion control can be used in areas like northeastern Oregon and southeastern Washington with cold and dry spring weather for fresh pea production and not expect serious increases in root rot diseases over clean till methods. T: Pea response to residue management.