Advances in Agronomy, Vol. 67 by Donald L. Sparks (Ed.)

By Donald L. Sparks (Ed.)

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

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It appears that the only difference between the two management philosophies is how much and how long it will take to reach the maintenance plateau. To some extent this is related to the critical level of soil tests proposed by the different management philosophies. 30 FRANCIS J. PIERCE AND PETER NOWAK Ultimately, if precision nutrient management is based on soil testing and fertilizer management philosophies, over time variable rate applications should create soil test levels that are optimal throughout the field and would require future variable rate applications based on crop removal and nutrient fixation in soils for maintenance.

For variable liming to be profitable, increased yields or lime application savings are needed to compensate for the cost of variable liming. However, acid soils in need of lime do not necessarily reduce crop yields because grain crops may not necessarily be affected by acid soil conditions (Black, 1993). McLean and Brown’s (1984) summary of crop response to soil pH in the Midwest showed that corn frequently did not respond to soil pH of 5 or 6, whereas alfalfa was strongly affected by this pH range, with soybean intermediate in response.

1996). Lowenberg-DeBoer and Swinton (1997) reported inconsistent results and generally low profitability of precision P and K management for the studies they reviewed, suggesting that management of one or two nutrients will not form the basis for profitability of precision agriculture. These are current or potential difficulties with precision management of nutrients such as P and K. However, the low temporal component of variability for these nutrients suggests that precision management will be of increasing value as spatial dependence increases.

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