Download e-book for kindle: Advances in Agronomy, Vol. 67 by Donald L. Sparks (Ed.)

By Donald L. Sparks (Ed.)

ISBN-10: 0120007673

ISBN-13: 9780120007677

Advances in Agronomy is still famous as a number one reference and a main resource of the newest and most sensible examine in agronomy. As consistently, the subjects coated are various and exemplary of the panoply of material handled by way of this long-running serial. quantity sixty seven includes 4 finished and well timed stories on issues within the crop and soil sciences. bankruptcy 1 addresses essentially the most energetic parts in agronomic research--precision agriculture. bankruptcy 2 is a considerate assessment on floor cost and solute interactions in soils. bankruptcy three completely covers advances within the use of molecular genetics to reinforce abiotic/edaphic rigidity resistance in turfgrass. bankruptcy four is an invaluable overview on an issue that's of significant curiosity to agronomists--allelopathy.

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Since nitrates are soluble, large leaching events should minimize residual nitrates within the root zone. , 1995b). Therefore, the benefits from precision N management are a result of accounting for residual N that is spatially variable. As farmers become skilled in this technique, the long-term effect of precision N management is a reduction in residual N, making precision N management less profitable although N leaching is continually reduced. Farmers do not get paid for environmental benefits so good precision management will lose its potential profit benefit to farmers.

1994a,b, 1995). ) receive the highest average N application rate of all crops (248 kg N haϪ1; USDA-ERS, 1997). These crops are the focus of much of the current research on precision N management. , 1996). , 1992). , 1996). , 1992). , 1996; Lenz, 1996; Lilleboe, 1996). • Where crop yield spatial variability is high and predictable: Nitrogen recommendations are based primarily on crop yield. If yield is variable, then precision N management based on yield goal makes sense if the yield variation is predictable from year to year (low temporal variability).

Negative effects of overliming are usually tied to decreased nutrient availability at high pH (Adams, 1984). Christensen et al. 5 pH units but had no detrimental effects on crop yield and improved sucrose content in the first 2 years of the 5-year study. Where will variable liming work? The potential for variable liming is related in part to how much lime is applied and where it is applied. Lime was applied to Ͻ6% of acreage of any major crop in the United States in 1995 with an average application rate of Ͻ2 Mg haϪ1 (USDA-ERS, 1997).

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