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"The southern mountain farm often produces no more than a scant living for the family. Corn is the chief crop grown. Often part of the farm lies idle, being "rested," while corn is grown on another part year after year until the land is worn out. By growing three or more crops in rotation including clover, the farmer will be able to produce larger crops, make more money, and keep all crop land under cultivation all the time. Cattle, hogs, and sheep will not only add to the cash income, but will help to increase the fertility of the soil, a nd render larger crops possible. This bulletin describes crop rotations for small mountain farms in the southern Alleghenies, and gives complete directions for starting a crop rotation that will make poor mountain land more productive."--Page [2]
Details the physiological, agronomical, and environmental factors needed to maintain or increase the productivity and sustainability of agricultural systems. Addressed to scientists in the agriculture industry, and graduate and advanced undergraduate students, rather than to farmers. Explores the ba
"Gulf Coast region upland soils are ordinarily deficient in nitrogen and need to be supplied with liberal quantities of organic matter if profitable crop yields are to be produced. This condition is most easily and cheaply remedied by growing such legumes as velvet beans, cur clover, crimson clover, hairy vetch and beggar weed, and by carefully utilizing all farm manures, crop residues, and other sources of humus. By a simple readjustment most of the cropping systems followed in this region may be made to include one or more legumes which ill in crease the supply of nitrogen and humus in the soil and greatly increase crop yields. Systems by means of which crop yields are being increased in the region are discussed in the following pages."--Page 2
Since photosynthetic performance is a fundamental determinant of yield in the vast majority of crops, an understanding of the factors limiting photosynthetic productivity has a crucial role to play in crop improvement programmes. Photosynthesis, unlike the majority of physiological processes in plants, has been the subject of extensive studies at the molecular level for many years. This reductionist approach has resulted in the development of an impressive and detailed understanding of the mechanisms of light capture, energy transduction and carbohydrate biosynthesis, processes that are clearly central to the success of the plant and the productivity of crops. This volume examines in the widest context the factors determining the photosynthetic performance of crops. The emphasis throughout the book is on the setting for photosynthesis rather than the fundamental process itself. The book will prove useful to a wide range of plant scientists, and will encourage a more rapid integration of disciplines in the quest to understand and improve the productivity of crops by the procedures of classical breeding and genetic manipulation.
The photosynthetic fixation of carbon dioxide into organic compounds is mediated by the enzyme ribulose 1,S-bisphosphate (RuBP) carboxylase. The diversity of current research on this protein attests to its central role in biomass productivity, and suggests the importance of a timely and broadly based review. This Symposium was the first devoted exclusively to RuBP carboxylase and was attended by agronomists, plant physiologists, biochemists, molecular biologists, and crystallographers. Special efforts were made to involve young scientists in addition to established investigators. It is a pleasure to acknowledge financial support provided by the Department of Energy, the United States Department of Agricul ture, and the National Science Foundation, and the valued assistance of agency representatives, Drs. Joe Key, Robert Rabson, Elijah Romanoff, and Donald Senich. Thanks are due to Mrs. Margaret Dienes, without whose editorial skills this volume could not have been produced, and to Mrs. Helen Kondratuk as Symposium Coordinator. Finally, we wish to record our indebtedness to Dr. Alexander Hollaender for his tireless efforts in support of all aspects of this Symposium.