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 major resource of the newest and most sensible learn in agronomy. As consistently, the subjects lined are various and exemplary of the panoply of subject material handled via this long-running serial. quantity sixty seven comprises 4 finished and well timed reports on subject matters within the crop and soil sciences. bankruptcy 1 addresses probably the most energetic components 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 tension resistance in turfgrass. bankruptcy four is an invaluable assessment on a subject that's of serious curiosity to agronomists--allelopathy.

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Pierce et al. 5-m regular grid had means (mg kgϪ1) and CVs (%) of 23 (34%), 50 (50%), and 124 mg kgϪ1 (26%) for P and 210 (39%), 173 (50%), and 121 mg kgϪ1 (297%) for K with strong spatial dependence for each nutrient. Han et al. (1996) reported spatial variability of P and K for two adjacent center pivots in Washington on a 61-m regular grid that had means (mg kgϪ1) and CVs (%) of 24 mg kgϪ1 (24%) for P and 183 mg kgϪ1 (21%) for K but very weak spatial structure even after data detrending. Walker et al.

It must first be determined whether variable liming will pay. The expectation is that soils requiring lime will benefit from increased yields and that overliming is costly and potentially yield reducing. The field in the Borgelt et al. (1994) study on average need- ASPECTS OF PRECISION AGRICULTURE 25 ed lime so it should be determined whether the more precise lime application improved the benefits over a uniform application. From this study, it is not possible to tell if the average application might have been sufficient to alleviate plant-limiting effects of low pH.

1995). To some extent, the need for variable lime can be anticipated by identifying where soil acidification is a recurring problem in production agriculture. There may be equipment limitations to variable lime application because agricultural lime is difficult to apply uniformly with conventional spreaders. The availability of appropriate precision equipment may be limited due to capital equipment costs and lack of sufficient acreage for lime application services to pay for such equipment. Variable lime applications are often made by applying uniform rates to areas within fields delineated as needing lime, but the extent to which this is occurring is difficult to assess.

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