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Giles, J.F
Thompson, L.M
Bermudez, M
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Authors
Thompson, L.M
Franzen, D.W
Landgraff, A.J
Giles, J.F
Cattanach, N.R
Reitmeier, L.J
Franzen, D.W
Giles, J.F
Hapka, A.J
Reitmeier, R.J
Cattanach, N.C
Cattanach, A.C
Kaiser, D.E
Mallarino, A.P
Bermudez, M
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Type
Oral
Year
1988
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2003
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1. Effect of Climatic Variability on Grain Yields

There are three cycles in climate and weather that affect the north central part of the United States. They are (1) a long term cycle of global temperature changes; (2) an 18.5 year wet and dry cycle; and (3) the El Ni�o cycle. ...

2. Nitrogen Availability, Time of Release and Movement in Rotations

Previous studies have found that N is released through the decomposition of sugarbeet tops (Moraghan and Smith, 1996: Reitmeier et a]., 1999). There is also evidence that N credits may be justified following other broadleaf crops, such as potato and sunflower. This evidence follows work by Vanotti and Bundy (1995) and Bundy et al. (1 993) suggesting that N credits from annual legumes are provided not by decomposition ofthe roots or release ofN directly into the soil from the roots as some might assume,...

3. Adjusting N Recommendations Based on a Previously Grown Crop

Nitrogen recommendations in North Dakota are based on a yield goal multiplied from some empirically derived factor in a linear formula. There are a three adjustments to the N recommendations that result form these formulas (Franzen and Cihacek, 1996). They are the soil test nitrate-N to some depth, a sampling date adjustment ifthe sampling was conducted in the fall prior to September 15, and a previous crop credit. Two of these three adjustments are based on some knowledge regarding mineralization...

4. In-Furrow Starter and Broadcast Phosphorus and Potassium Fertilization for Corn

Increasing awareness of potential impacts of farming on the environment has renewed interest in further study of fertilizer management strategies that reduce nutrient inputs. Fertilizer recommendations for phosphorus (P) and potassium (K) usually are based on soil-test values and nutrient removal with crop harvest. Many Midwest fmers follow these recommendations. but many others apply removal-based P and K fertilizer rates even in high-testing soils. The typical farmer applies P and K fertilizer...