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Wednesday, June 20, 2018

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754. Bennett, W., D. Pittman, D. Tingey, D. McAllister, H. Peterson, and I. Sampson. 1954. Fifty years of dry land research (at the Nephi Field Station).. Utah Agr. Expt. Sta. Bulletin 371.
Summarizes the results of 50 yr of research at the Nephi Field Station in cental Utah. Discusses climate - spring rainfall crucial, fall emergence of wheat correlated to high yields. Ave. annual precipitation is 12.65 in. Tillage experiments - fall verus spring plowing did not affect yields, while late spring plowing lowered yields. Plowing to 8" depth increased yields by 8% compared to plowing at 5". Yields were higher with plowing and no further cultivation on fallow (weeds controlled) than with normal fallow tillage. Yields were poor with stubble mulch. Fertility: A pea green manure increased wheat yields both in the short and long term. Wheat yields were sometimes depressed by green manure, due to moisture shortage or N immobilization. Manure application increased wheat yields in all treatments, and was more beneficial in wet years. N fertilizer increased wheat yields and protein. Burning straw increased yields for 30 yr, then they began to decline. No response to P. Wheat-fallow gave the greatest yields and net returns, and wheat was the only crop distinctly benefitted by summerfallow. Alfalfa depressed the following wheat yields but improved soil fertility. Continuous wheat yielded less than 40% of wheat-fallow. Wheatgrasses showed potential for forage and seed. Spring wheats yielded 60% of winter wheat. Only 32% of rainfall was stored as soil moisture in summerfallow. Overall, yields were low (15-25 bu/ac) and treatment differences were small (1-3 bu). These results predate the semidwarf wheat varieties.

7211. Veseth, R.. 1989. Selecting soft white winter wheat varieties for conservation tillage.. STEEP Conservation Farming Update, Summer 1989, p. 9-11.
A number of commonly used winter wheat varieties were tested for performance under conventional and no-till management. Yield rankings for the varieties were nearly the same under no-till and till treatments. The ratios of no-till yield to till yield for each variety generally ranged from 0.95 to 1.00. Hill 81 had a ratio of 0.90, indicating that it was not achieving its yield potential under no-till, although more recent results have found it to be a good variety for no-till. Growers should generally select varieties which yield the highest under conventional tillage in their area when evaluating varieties for no-till or other conservation tillage systems. Other factors should be considered when selecting varieties. Early fall planting leads to higher disease potential for stripe rust, strawbreaker footrot, Cephalosporium stripe, and barley yellow dwarf virus. Thus, resistance to these diseases should be a varietal consideration. One significant drawback of semi-dwarf wheats that has not been fully overcome is poor emergence under less-than-desirable seedbed conditions. Also, cold hardiness varies with variety. Daws has generally shown superior cold hardiness, but has other drawbacks.

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