WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Wednesday, January 24, 2018


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Search results on 01/24/18

5694. Rasmussen, P.E., D.E. Wilkins and C.L. Douglas Jr.. 1985. Annual-crop spring barley response to nitrogen, sulfur and phosphorus.. OR Agr. Expt. Sta. Special Report 738, p. 33-34.
Annual cropping is often possible where annual precipitation exceeds 14 inches. It is recommended on soils less than 4 ft deep since the soil profile normally is filled by a single winter's rainfall. Rotation of winter wheat with a spring cereal is often preferred to continuous winter wheat because weed control is easier and stubble more manageable. Fertilizer needs increase sharply under annual cropping because nutrient buildup by fallowing is eliminated and competition for nutrients by residue-decomposing organisms is more intense. In this study, nitrogen, phosphorous and sulfur response by spring barley was determined for annual-crop conventional and minimum tillage.

953. Bolton, F.E.. 1984. Sulfur response trial - 1983. OR Agr. Expt. Sta. Special Report #713, p.26-27.
A trial was established on the Moro Station in the fall of 1982 with four levels of sulfur and two levels of nitrogen. Sulfur increased grain yield when no N was applied. There was no additional yield increase above 9 lb S/ac. Positive response to sulfur at low nitrogen levels was an indication that sulfur is near the critical level. The addition of small amounts of sulfur (10-15 lb/ac) may be good insurance for sustaining high yield levels.

5463. Pumphrey, F.V. and P.E. Rasmussen. 1982. Winter wheat fertilization in the Northwest intermountain region.. OR Agr. Expt. Sta., Circular #691. OSU, Corvallis, OR..
Most dryland wheat needs 40-100 lb/ac N. Early spring applications of N are 50% more efficient. Most wheat fields also need S. Most soils do not need P, but if needed half as much P needs to be applied if drilled with seed versus seperate application. T: N fertilizer effect on yield. N and S in grain and straw of a 50 and 125 bushel crop. Yields of wheat fertilized with different sources and forms of N. Soil N in non-fertilized soil as influenced by soil depth and sampling from planting to harvest. Soil N as influenced by soil depth, time of sampling, and fertilizer applications.

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