WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Wednesday, April 25, 2018


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Search results on 04/25/18

1827. Elliott, L.F. and R.I.Papendick. 1986. Crop residue management for improved soil productivity.. Biological Agriculture and Horticulture 3:131-142.
Residue management is critical to maintaining soil structure and organic matter. Surface management of residue along with reduced tillage seems the best approach. A seeding drill has been developed to plant in heavy residue and to move residue away from the seed. Mating this approach with organic farming appears viable, with no or very little use of synthetic fertilizer. Row crop weed control is also viable with this system. This paper contains an excellent discussion on micro aggregate formation/stability and the importance of microbiol activity. There is also a discussion on biological activity in conventional and organically farmed soil.

6359. Smiley, R., D. Wilkins, W. Uddin, S. Ott, K. Rhinhart, and S. Case. 1989. Rhizoctonia root rot of wheat and barley.. OR Agr. Expt. Sta. Special Report 840, p. 68-79..
Rhizoctonia root rot is now considered the most severe root disease of barley in the PNW. It is more important than take-all and Pythium on wheat produced in drier areas (<16" precip.). Based on long-term plots at Pendleton, different management systems are unlikely to greatly influence the biological resistance of soils to Rhizoctonia. Rotational crops susceptible to Rhizoctonia include wheat, barley, peas, chickpeas, lentils, and rapeseed. The disease is less apparent on small grains after legumes than after cereals. Rhizoctonia damage is always highest on no-till systems, but yields may not suffer due to improved water relations under conservation tillage. Australian research indicates that applications of N and P fertilizers can reduce the disease. There appear to be detrimental herbicide interactions with Rhizoctonia, particularly Glean on high pH soils. Also, the use of glyphosate increased disease incidence, perhaps by signalling the pathogens to move from the dying plants to newly seeded ones. A delay of at least 2 weeks is suggested between chem kill and planting of a new crop.

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