WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Tuesday, January 23, 2018

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5500. Radosovich, Stephen. 1990. presentation at the Farming for Profit and Stewardship Conference, Vancouver, WA Mar. 2-3, 1990. Forest Science Lab, Oregon State Univ., Corvallis, OR 97331.
Dr. Radosovich, a researcher at OSU, described work with non-chemical weed control in ryegrass. He is exploring the effect of planting geometry on weeds. A square arrangement was almost 10 times more competitive than a rectangle for the crop. Tilling the soil at night changed the weed spectrum and the % germination, due to phytochrome response. Light quality can be manipulated by crop or residue canopy to alter the amount of red light hitting the soil. This might affect plant competitiveness. Use plants as a "green filter". Plant a cover crop early, filter out red light, plant the crop, frost will kill the cover crop. Also, seeding at night, less weed germination triggered, and moisture comes up in deep furrows. Need to look at light intensity, light quality, and light reflectance, especially the red:far red ratio. This can also affect insect behavior.

5735. Rasmussen, P.E. and C.R. Rohde. 1988. Stubble burning effects on winter wheat yield and N utilization under semiarid conditions.. Agronomy J. 80:940-942.
Burning vs. not burning was examined at 3 nitrogen levels over 6 years (3 crops). Burning had no effect on grain yield or grain N uptake. Burning increased straw yield when wheat was fertilized by N, but had no effect on straw N uptake. Burning did not decrease foot rot incidence or severity, but did reduce downy brome density. T: Effects of stubble burning and N fertilization on grain and straw of winter wheat 1980-85. Effect of stubble burning on foot rot infection. Effect of stubble burning on downybrome infestation.

5934. Rogers, R.D.. 1982. Undercutting as a wildlife conservation method.. Proc. Great Plains Ag. Council, p.25.
Using an undercutter without mulch treaders instead of surface tillage implements for fallow weed control in spring can save up to 50% of the bird nests in wheat stubble. Wheat stubble is often undisturbed following harvest and provides a good source of winter food and cover for wildlife. Nest survival increases directly with undercutter size and can potentially exceed 50% with large, wide-bladed undercutters. Both for wildlife and agronomic benefits, the use of an undercutter for the first spring fallow weed control operation is strongly recommended.

7652. Wolfe, H.H. and L.W. Rasmussen. 1953. Weed control in cereal crops.. Washington State College Ext. Serv. Misc. Publ. #1.
Covers: chemicals for weed control - recommends amine form as 2,4-D in solution over all others; rates - 0.5 lb 2,4-D acid/ac; timing; amount of water; equipment; cultivation; soil sterilants. There is also a revised version of this circular which recommends 0.75 lb 2,4-D acid/ac for perrenial weeds. T: Recommended amounts of 2,4-D.

8448. Willis, H.. 1990. Wheat - the staff of life.. Acres USA, May 1990, p. 11-14.
The best long-term way to control weeds is to get soil nutrients into balance, with relatively high calcium and phosphorus, and low potassium levels. Soaking seeds in hydrogen peroxide solution for 8 hours should increase germination rate. A general foliar feed recipe is given consisting of 1 qt. liquid phosphoric acid, 1 gallon household ammonia, and 2 gallons liquid fish emulsion. A refractometer can be used to monitor crop health. For growing wheat, use sap from the second and third newest leaves. Later, use the flag leaf. A sugar reading of about 18% or above is good. Readings over 25% are excellent and below 8% poor.

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