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 remains to be well-known as a number one reference and a chief resource of the most recent and most sensible learn in agronomy. As constantly, the subjects coated are different and exemplary of the panoply of material handled by means of this long-running serial. quantity sixty seven comprises 4 finished and well timed studies on subject matters within the crop and soil sciences. bankruptcy 1 addresses probably the most lively 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 assessment on a subject that's of serious curiosity to agronomists--allelopathy.

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This is a preventative approach to protect against yield loss because of nutrient deficiency and focuses on building soil fertility. Once the initial buildup is achieved, then the need for further soil testing is eliminated if fertilizer application adheres to the maintenance application (Dahnke and Olson, 1990). Applying this soil testing and fertilizer management philosophy to precision management, the goal would be to either increase the soil test levels of a field through fertilization or decrease the soil test levels through crop removal to the maintenance level and then fertilize based on crop removal as indicated by yield maps.

More consideration needs to be given to map accuracy and its implication for precision management. c. High-Resolution Sensing The importance of sensing technology to precision agriculture was discussed earlier. The improvement of high-resolution sensing over interpolation of sampling points is evident when yield mapping is considered. For example, sampling 22 FRANCIS J. PIERCE AND PETER NOWAK intensity in a yield map is orders of magnitude higher than that used in grid sampling. The exercise of grid sampling a yield map would reveal the weaknesses inherent in interpolation of spatial sample points.

The potential direct economic benefit of precision pest management to farmers is a reduction in chemical/nonchemical pest management costs, crop damage, or both due to more efficacious or efficient application of pest control measures. A reduction in pesticide use, however, does not translate into profit if the cost of obtaining information about pest populations and distribution exceeds the savings (Forcella, 1993; NRC, 1997). Environmental benefits are presumed to result from a reduction in pesticide usage, particularly in sensitive environments, although the results of the few studies on the potential of precision farming to provide environmental benefits have been inconclusive regarding its effect on pesticide use (USDA-ERS, 1997).

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

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