Browse on keywords: organic matter grain
Search results on 05/26/13
1710. Douglas, C.L., P.E. Rasmussen, L.L. Baarstad and R.R. Allmaras. 1984. Crop residue distribution by combines.. OR Agr. Expt. Sta. Special Report 713, p. 37-40.
Uniform distribution of wheat straw and chaff is necessary for success of conservation tillage programs. Results indicate that: a)standard factory-produced combines distributed straw and chaff unevenly in the field; b)straw-choppers did not automatically improve uniformity of distribution; c)a chaff spreading attatchment on a cylinder-type combine improved distribution significantly; and d)shop modification of flails on a rotary-type combine gave a nearly uniform distribution. Improvements on combines are seriously needed to assure the uniform straw and chaff distribution so necessary for successful adoption of conservation tillage systems. T: Straw distribution by cylinder and rotary combines.
1720. Douglas, C.L., R.E. Ramig, P.E. Rasmussen and D.E. Wilkins. 1987. Residue management: small grains in the Pacific Northwest.. Crops and Soils Magazine, Aug./Sept., p.22-24.
Lack of water usually limits production in dryland cropping areas of the inland Pacific Northwest (WA, OR, ID). Precipitation is frequently insufficient during the growing season; thus, it is necessary to rely on stored soil water for cropping. Annual precipitation is unevenly distributed with approximately 65% occurring between November and March when soils may be frozen. Conventional tillage systems in the steeply rolling areas of Idaho, eastern Wash. and eastern Oregon result in high soil erosion rates which will eventually make it impossible to sustain high levels of crop production. Enough surface residue (normally 1 T/ac) must be left after fall seeding to control winter soil erosion and to sustain current production. Cereal residue management in the Pacific Northwest must begin at harvest of the previous crop. Uniform distribution of residues behind a combine eliminates chaff rows which shelter rodents and weeds, and create physical barriers to herbicide application and cereal growth. Fertilizer banding is necessary to reduce its use by shallow rooted weeds and the immobilization of certain nutrients by microorganisms. Equipment design must allow seeding and fertilizing through large amounts of surface residues.
6108. Schafer, E.G., E.F. Gaines and O.E. Burbee.. 1921. Cultural experiments with wheat.. WA Agr. Expt. Sta. Bull. #160.
Manure applied in spring before plowing, at 10T/ac, increased average yields by 2.2 bushels. Manure applied in the fall before plowing, at 10 T/ac increased average yields 14.2 bu. Early plowed and tilled summer fallow produced 11.8 bu. more than late plowed no tilled summer fallow. Average yield during the second 10 yrs of rotation periods was greater than the first 10 yrs of rotations. Continuous cropping of either spring or winter wheat decreased yields considerably during the second 10 yr period. T: Effect of manure on yield of wheat. Wheat grown in various rotations. Comparison of fall and spring plowing for yield of spring wheat.
6555. Smith, V.T.. 1941. The effect of organic residues and fertilizers on the yield and quality of wheat and on the organic matter status of a semi-arid soil.. MS Thesis, Washington State College, Pullman, WA.
OM was increased most by addition of manure and least by 40 lb/ac application of straw. Suggestions for OM maintenance are: a) addition of straw and manure increases C-N of soil without depressing yield; b) addition of ammonium sulfate both with and without straw increases C, N in the spring, N in grain and straw, and yield of straw, without depressing yield; c) addition of either straw and manure or straw and N are equally efficient in increasing C and N in soil. T: many. eg.: grain yields from the Organic Matter Maintenance Series of plots, 1923-1940. Acre inches of available moisture in the soil at the Organic Matter Maintenance Series. Pounds of nitrates per acre at the Organic Matter Maint. Series plots.