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2232. Grabe, D., F. Bolton, C. Garbacik, and J. DeNoma. 1989. Response of winter wheat to yield-enhancing agents.. Columbia Basin Agr. Research Spec. Report 840.
Tested a number of non-traditional products, including YEA!, Amplify-D, Car-Dak, Bio-Mag seed treat, seed moisturing. YEA! had a small but significant effect on seedling growth, while the other products did not. No yield responses were observed. Seed moisturizing with various pressure treatments did not appear to have any field benefits.
5640. Rasmussen, P.E.. 1976. Nitrogen and sulfur fertilization effects on water relations and growth of non-irrigated white wheat.. OR Agr. Exxpt. Sta. Special Report 459, p. 17.
969. Bolton, F.E. and S. Aktan. 1978. Effects of different levels of fallow moisture on the amount and distribution of nitrate-N in the soil profile.. Columbia Basin Agr. Res. Sta. Progress Report, p.27.
Effects of different levels of fallow moisture on the amount and distribution of nitrate-N in the soil profile.
1180. Campbell, C.A., R.P. Zentner and P.J. Johnson. 1988. Effect of crop rotation and fertilization on the quantitative relationship between spring wheat yields, available soil moisture, and precipitation.. Canadian J. Soil Sci., 68(1):1-16.
The effects of crop rotation and fertilization on the quantitative relationship between spring wheat yields, available soil moisture, and growing season precipitation were determined. Stubble-seeded wheat required 68 mm of moisture to produce the first kilogram per hectare of grain; fallow-seeded wheat required about 46mm. The lower threshold level of MU for grain production decreased from about 140mm to the values cited above; this has resulted in substantially greater moisture use efficiency in recent years likely due to better, more timely crop mangement and the improved cereal varieties.
1608. Doneen, L.D.. 1934. Nitrogen in relation to composition, growth and yield of wheat.. WA Agr. Expt. Sta. Bull. #296.
On soil with adequate N, adding sodium nitrate retarded wheat growth. The carbohydrate - N ratio of plant tissue was not affected by fertilizer treatment or variety. Under extreme conditions (e.g. variations in N or moisture) there were considerable differences in varietal adaptations. The addition of N after normal tillering caused production of new tillers and increased yields. Fall fertilization led to higher water use and spring moisture deficit. T: many tables. e.g.: Composition of total sugar, non-coagulate nitrogen, amino N, and nitrate on wheat grown under various soil treatments. Yield of grain and straw of wheat treated with sodium N. N removed from soil by grain and straw of wheat treated with different amounts of sodium N/ac. Yield of grain and straw of wheat treated with 500 lb. sodium N/ac.
3524. Kardos, L.T.. 1948. Lysimeter studies with cultivated and virgin soils under subhumid rainfall conditions.. Soil Science, 65:367-381.
Pullman, WA study. Lateral flow beneath the soil was significant, enough to cause erosion, but none was noticed. Less silaceous and compact layers in virgin soil. Total N in leachate water tended to be higher from the cultivated plot - cultivated ranged from 1-15 ppm, virgin 2-3 ppm. 2-5 times more total solids in cultivated leachate. Nitrate N higher from cultivated. Nitrate N leaching subsurface from slopes and concentrated in basins. Does not occur on virgin area. Subsurface leaching 20-30 inches below surface. W-P rotation encouraged erosion loss and subsurface nutrient loss. T: leachate chemical analysis.
3652. Kmoch, H.G., R.E. Ramig, R.L. Fox, and F.E. Koehler. 1957. Root development of winter wheat as influenced by soil moisture and nitrogen fertilization.. Agronomy J. 49:20-25.
Although there was little top growth in November, root development was extensive for all moisture treatments. Roots which developed under less favorable moisture conditions were finer and had more and longer branches. April samples revealed that the primary root system was in the process of decay. Living roots were generally confined to regions of moist soil. Total weight of roots was highest where nitrogen had been applied. June samples revealed roots to a depth of 13 feet where moisture conditions were favorable. There was evidence of moisture depletion to a depth of 8'. N fertilizer increased root weights and moisture utilization at all moisture levels.
3865. Leggett, G.E.. 1959. Relationships between wheat yield, available moisture and available nitrogen in eastern Washington dryland areas.. WA Agr. Expt. Sta. Bull. #609.
The purpose of this work is to demonstrate the relationships which exist between (1) available moisture and wheat yield and (2) available nitrogen and wheat yield. Using these relationships, it is possible to calculate the amount of fertilizer nitrogen necessary to obtain maximum wheat yield if the supply of available nitrogen in the soil and the amount of moisture available for the crop can be estimated. The results of 90 fertility experiments conducted on dryland wheat in eastern Washington during the period 1953-1957 were used to determine the relationship between wheat yield and available moisture. The results of 62 experiements were used to determine the relationship between wheat yields and available nitrogen. It is possible to calculate nitrogen fertilize recommendations from the results of soil tests for nitrate-nitrogen and available soil moisture by use of these relationships.
4807. Nelson, A.L.. 1950. Methods of tillage for winter wheat.. WY Agr. Expt. Sta. Bulletin 300.
Fallow/winter wheat production decreased soil N by 33% in the top 6" over 35 years. Continuous cropping lost 24% of the soil N. Crop rotations using green manure every 4th year did not decrease the loss of soil N. Average winter wheat yields (bu/ac) over 34 years for 3 rotations were: oats/rye(GM)/winter wheat/corn - 12.9; oats/peas(GM)/winter wheat/corn - 12.7; fallow/winter wheat - 13.7; oats/corn/winter wheat/rye - 13.2; oats/corn/winter wheat/peas - 14.1; oats/corn/winter wheat/fallow - 13.2. It was observed that green manure took years to break down. Tillage with an eccentric one-way increased winter wheat yields 2 bu/ac over 10 years compared to plowing. The eccentric one-way conserved moisture. Continuous cropping resulted in winter wheat yields 55% of biennial yields following fallow. Soil moisture was 3-4% lower in October after continuous cropping versus fallow.
5396. Jackson, G.D. and J.R. Sims. 1977. Comprehensive nitrogen fertilizer management model for winter wheat.. Agron. J. 69:373-377.