Browse on keywords: tillage fallow
Search results on 06/19/13
11126. Rasmussen, V.P. and R.L. Newhall. 1991. Dryland tillage demonstration /research plots.. Agri-hint Series 109, Coop. Ext., Utah State Univ., Logan..
Seven cropping systems are being compared to determine fallow efficiencies and erosion potentials. The annual crop system outyielded the crop-fallow systems in the two years of study.
4152. McCall, M.A. and H.M. Wanser. 1924. The principles of summer fallow tillage. WA Agr. Expt. Sta. Bull. #183.
This is the results of experiments carried out at the Adams station near Lind, WA, in the 15" rainfall zone. It discusses moisture and the moisture - nitrate accumulation relationship. No discussion of OM or erosion related to summer fallow is included. Nitrate accumulation is dependent on the maintenance of suitable moisture and temperature conditions." "Early spring plowing gives the largest accumulation of nitrates. Disking is less efficient at promoting nitrification."
5585. Ramig, R.E. and L.G. Ekin. 1987. Fallow systems for semiarid eastern Oregon and Washington.. OR Agr. Expt. Sta. Special Report 797, p.34.
5601. Ramig, R.E. and L.G. Ekin. 1988. Should I double fallow?. OR Agr. Expt. Sta. Special Report 827, p.57.
5611. Ramig, R.E. and L.G. Ekin. 1987. Conservation tillage systems for annually cropped wheat in the Pacific Northwest.. J. Soil Water Cons., 42(1):53-55.
A four-year study was conducted at two historically wheat-fallow locations in Oregon to compare yields of annually cropped wheat in no-till, disk, and chisel tillage systems with yields of wheat following conventionally chiseled and rodweeded fallow. Tillage method did not affect yields of annually cropped wheat. This permits developement of a management strategy that reduces soil erosion risk and increases average annual production. The following is proposed: 1. Fall disk only for residue reduction or weed control. No-till for fuel, machinery, and labor savings. 2. Wait for weed emergence after fall rains and spray with a broad spectrum herbicide. 3. Seed adapted winter wheat or barley if conditions permit. 4. If conditions prevent fall seeding, spray weeds in the spring and seed spring-seeded varieties. Fall-seeded grains generally yield more. 5. If insufficient water is stored in the soil to support a crop (180 mm), fallow to conserve and store water for the next crop. T: effect of tillage system on wheat yields.
5725. Rasmussen, V.P. and R.L. Newhall. 1989. High residue conservation tillage increases soil moisture and profits. IN: Utah Agricultural Statistics, 1989. p. 121-124. Utah Agricultural Statistics Service, Salt Lake City, UT.
Three years of data are reported for several locations comparing a number of consevation tillage and cropping systems. The no-till and chemical fallow were better both for conserving soil and moisture, and generated the highest net returns. The chem fallow conserved about 1-2 inches of soil moisture. Erosion under the no-till chem fallow ranged from 1-5 T/ac compared to 17-30 T/ac with conventional tillage. The study included tests of continuous cropping, but more years are needed to make an economic comparison.
8374. Peterson, G.A., E. McGee, D.G. Westfall, C.W. Wood, and L. Sherrod. 1990. Crop and soil management in dryland agroecosystems.. Technical Bull. TB90-1, Dept. of Agronomy, Colorado St. Univ., Fort Collins, CO.
A large-scale field experiment was established in 1985 at 3 eastern CO locations to examine alternatives to the traditional wheat-fallow cropping system. All new treatments used no-till instead of tillage intensive management. Rotations include wheat-fallow, wheat-corn-fallow, wheat-corn-millet-fallow, and perennial grass. After five years, the more intensive cropping was giving greater grain output, nitrogen use efficiency, and water use efficiency than the wheat-fallow system. Organic matter levels also appear to be increasing. The research is also examining each strip plot at three landscape positions: toeslope, sideslope, and summit.
9493. Peterson, G.A., D.G. Wood, and C.W. Wood. 1989. Crop and soil management in dryland agroecosystems.. Technical Bulletin TB893, Dept. of Agronomy, Colorado State University, Fort Collins, CO..
The general objective of the project is to identify dryland crop and soil management systems which will maximize water use efficiency of the total annual precipitation. Specific objectives: 1. Determine if cropping sequences with fewer and/or shorter summer fallow periods are feasible. 2. Quantify the relationship of climate (precipitation and evaporative demand), soil type and cropping sequences that involve fewer and/or shorter fallow periods. 3. Quantify the effects of long-term use of no-till managemment systems on soil structural stability, microorganisms and faunal populations of the soil and the organic N and P content of the soil, all in conjunction with various crop sequences. 4. Identify cropping or management systems that will minimize soil erosion by crop residue maintenance. 5. Develop a data base across climatic zones that will allow economic assessment of entire management systems.
10245. Ramig, R.E. and L.G. Ekin. 1991. When do we store water with fallow?. 1991 Columbia Basin Agricultural Research, Special Report 879, OR Agr. Expt. Sta., Corvallis.
Water storage was monitored at Pendleton (16" precip.) and Moro (11" precip.), Oregon from 1978-1984. Storage percentages for the fallow winter, fallow summer, and crop winter were 75, -19, and 54 %, respectively. Significantly less water was stored during the fallow winter in both rainfall zones where the wheat stubble had been burned in the fall. Differences in water conservation and storage among other treatments (spring plow, fall flail, fall disk, and spring sweep) were not significant at both locations. Total water storage for the 18-month crop-fallow cycle was 37 % at Moro and 33% at Pendleton. The best opportunity to improve water conservation and storage in this climate appears to be during the crop winter when only 40-54% of the precipitation was stored.
10844. Tanaka, D.. 1989. Spring wheat plant parameters as affected by fallow methods in the northern Great Plains.. Soil Sci. Soc. Amer. J. 53:1506-1511.
Chem fallow was compared to stubble mulch and reduced tillage in a spring wheat-fallow rotation. Average surface residue prior to planting was three and two times greater than reduced tillage for chem fallow and stubble mulch, respectively. Chem fallow plots stored more soil water, but this did not increase yield during the study. During years of crop stress resulting from limited soil water, chem fallow may produce higher yields than stubble mulch. Grain water use efficiency was greater for wheat grown on stubble mulch plots than on chem fallow plots.