Higher C/N ratio of cereal rye resulted in immobilizing N. Nitrogen uptake by cereal rye preceding soybean in CcrShv and CcrSor was 16−20 kg ha −1 greater compared to winter weeds in CncSnc. Rotation with hairy vetch as a preceding CC (CcrShv) increased corn grain yield by 14.09 and 12.35% compared to rotations having noCC and oat+radish as preceding CCs in one of the years, respectively. The objective of this study was to examine the effects of CC and noCC rotations corn ( Zea mays L.) −cereal rye ( Secale cereale L.)−soybean −hairy vetch ( Vicia villosa R.), corn−cereal rye−soybean−oat+radish ( Avena sativa L.+ Raphanus sativus L.), and corn−noCC−soybean−noCC and two tillage systems on aboveground plant attributes including dry matter yield, C/N ratio, N uptake, and crop yields. However, the adoption of CCs by farmers remains marginal in the United States because of the direct increase in the cost of planting and potential interference of CCs with grain crop production. Undoubtedly this resulted not only References will be consulted and should compensate from the thalidomide tragedy, but also from the for this lack of completeness.Cover crops (CCs) are promoted in agricultural systems because of multi-functionality claims of CCs increasing soil health, improving nutrient management, and enhancing crop yields.
It is my hope that the list of Further birth defects. Some good In recent years, there has been an impressive papers have been left out or given relatively little surge of interest in the causes and prevention of consideration. Since then, many important discoveries The scope of this volume and space limitations and significant developments have been made, par precluded discussion of and reference to all papers ticularly in the areas of environmental teratogenesis, of relevance or importance: a work of the present hereditary mechanisms, and prenatal diagnosis. For the first time, an environ has been made to provide a critical assessment of mental agent was found to be teratogenic in man current concepts and to identify areas in need of and was documented in a thoroughly convincing further investigation. In particular, an attempt multiple anomalies. Surprisingly, the beginning of a modern approach This collection of articles and commentaries is an to the problems of birth defects is relatively recent integration of information from many disciplines, and dates from Gregg's classical report in 1941 that and presents a comprehensive survey of both recent mothers who contracted rubella during the first tri and previously reported work related to the major mester of pregnancy gave birth to infants with severe aspects of birth defects.
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